FORM 10-K/A                           2000

                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549
(Mark One)
   [X]        ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934
                  For the Fiscal Year Ended December 31, 2000
                                      OR
   [_]      TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934
                For the transition period from ______ to ______


                         Commission file number 1-5153

                                USX CORPORATION
            (Exact name of registrant as specified in its charter)
              Delaware                                          25-0996816
      (State of Incorporation)              (I.R.S. Employer Identification No.)
                 600 Grant Street, Pittsburgh, PA  15219-4776
                   (Address of principal executive offices)
                            Tel. No. (412) 433-1121

         Securities registered pursuant to Section 12 (b) of the Act:*



=================================================================================================================================
                                                        Title of Each Class
---------------------------------------------------------------------------------------------------------------------------------
                                                                 
   USX-Marathon Group                                               8-3/4% Cumulative Monthly Income Preferred Shares,
        Common Stock, par value $1.00                                   Series A (Liquidation Preference $25 per share)**/(a)/
   USX-U. S. Steel Group                                            6.75% Convertible Quarterly Income Preferred
        Common Stock, par value $1.00                                   Securities (Initial Liquidation Amount $50 per
   6.50% Cumulative Convertible Preferred                               Security)***/(a)/
        (Liquidation Preference $50.00 per share)                   7%  Guaranteed Notes Due 2002 of Marathon Oil
                                                                        Company/(a)/
=================================================================================================================================


Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15 (d) of the Securities Exchange Act of 1934
during the preceding 12 months and (2) has been subject to such filing
requirements for at least the past 90 days.  Yes  X  No____
                                                 ---

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-K (ss.229.405 of this chapter) is not contained herein, and will
not be contained, to the best of registrant's knowledge, in definitive proxy or
information statements incorporated by reference in Part III of this Form 10-K
or any amendment to this Form 10-K. [_]

Aggregate market value of Common Stock held by non-affiliates as of January 31,
2001: $10 billion. The amount shown is based on the closing prices of the
registrant's Common Stocks on the New York Stock Exchange composite tape on that
date. Shares of Common Stock held by executive officers and directors of the
registrant are not included in the computation. However, the registrant has made
no determination that such individuals are "affiliates" within the meaning of
Rule 405 under the Securities Act of 1933.

There were 308,269,864 shares of USX-Marathon Group Common Stock and 88,767,023
shares of USX-U. S. Steel Group Common Stock outstanding as of January 31, 2001.

Documents Incorporated By Reference:
     Proxy Statement dated March 12, 2001 is incorporated in Part III. Proxy
     Statement dated March 9, 1998 is incorporated in Part IV.

__________
     *   These securities are listed on the New York Stock Exchange. In
         addition, the Common Stocks are listed on The Chicago Stock Exchange
         and the Pacific Exchange.
    **   Issued by USX Capital LLC.
   ***   Issued by USX Capital Trust I.
   /(a)/ Obligations of Marathon Oil Company, USX Capital LLC and USX Capital
         Trust I, all wholly owned subsidiaries of the registrant, have been
         guaranteed by the registrant.


Item 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
         OF OPERATIONS

         Indexes to Financial Statements, Supplementary Data, Management's
Discussion and Analysis, and Quantitative and Qualitative Disclosures About
Market Risk of USX Consolidated, the Marathon Group and the U. S. Steel Group
are presented immediately preceding pages U-1, M-1 and S-1, respectively.

Item 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

         Indexes to Financial Statements, Supplementary Data, Management's
Discussion and Analysis, and Quantitative and Qualitative Disclosures About
Market Risk for USX Consolidated, the Marathon Group and the U. S. Steel Group
are presented immediately preceding pages U-1, M-1 and S-1, respectively.

Item 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
         FINANCIAL DISCLOSURE

         Not applicable.

                                      53


     USX


Index to Consolidated Financial Statements, Supplementary Data, Management's
Discussion and Analysis, and Quantitative and Qualitative Disclosures About
Market Risk



                                                                                                  Page
                                                                                                  ----
                                                                                               
Management's Report.............................................................................   U-1

Audited Consolidated Financial Statements:
 Report of Independent Accountants..............................................................   U-1
 Consolidated Statement of Operations...........................................................   U-2
 Consolidated Balance Sheet.....................................................................   U-4
 Consolidated Statement of Cash Flows...........................................................   U-5
 Consolidated Statement of Stockholders' Equity.................................................   U-6
 Notes to Consolidated Financial Statements.....................................................   U-8

Selected Quarterly Financial Data...............................................................   U-30

Principal Unconsolidated Affiliates.............................................................   U-31

Supplementary Information.......................................................................   U-31

Five-Year Operating Summary-- Marathon Group....................................................   U-39

Five-Year Operating Summary-- U. S. Steel Group.................................................   U-41

Five-Year Financial Summary.....................................................................   U-42

Management's Discussion and Analysis............................................................   U-43

Quantitative and Qualitative Disclosures About Market Risk......................................   U-65




                        Management's Report

                        The accompanying consolidated financial statements of
                        USX Corporation and Subsidiary Companies (USX) are the
                        responsibility of and have been prepared by USX in
                        conformity with accounting principles generally accepted
                        in the United States. They necessarily include some
                        amounts that are based on best judgments and estimates.
                        The consolidated financial information displayed in
                        other sections of this report is consistent with these
                        consolidated financial statements.
                             USX seeks to assure the objectivity and integrity
                        of its financial records by careful selection of its
                        managers, by organizational arrangements that provide an
                        appropriate division of responsibility and by
                        communications programs aimed at assuring that its
                        policies and methods are understood throughout the
                        organization.
                             USX has a comprehensive formalized system of
                        internal accounting controls designed to provide
                        reasonable assurance that assets are safeguarded and
                        that financial records are reliable. Appropriate
                        management monitors the system for compliance, and the
                        internal auditors independently measure its
                        effectiveness and recommend possible improvements
                        thereto. In addition, as part of their audit of the
                        consolidated financial statements, USX's independent
                        accountants, who are elected by the stockholders, review
                        and test the internal accounting controls selectively to
                        establish a basis of reliance thereon in determining the
                        nature, extent and timing of audit tests to be applied.
                             The Board of Directors pursues its oversight role
                        in the area of financial reporting and internal
                        accounting control through its Audit Committee. This
                        Committee, composed solely of nonmanagement directors,
                        regularly meets (jointly and separately) with the
                        independent accountants, management and internal
                        auditors to monitor the proper discharge by each of its
                        responsibilities relative to internal accounting
                        controls and the consolidated financial statements.


                                                                                              
                        Thomas J. Usher                          Robert M. Hernandez                Larry G. Schultz
                        Chairman, Board of Directors &           Vice Chairman &                    Vice President-
                        Chief Executive Officer                  Chief Financial Officer            Accounting


                        Report of Independent Accountants

                        To the Stockholders of USX Corporation:

                        In our opinion, the accompanying consolidated financial
                        statements appearing on pages U-2 through U-29 present
                        fairly, in all material respects, the financial position
                        of USX Corporation and its subsidiaries at December 31,
                        2000 and 1999, and the results of their operations and
                        their cash flows for each of the three years in the
                        period ended December 31, 2000, in conformity with
                        accounting principles generally accepted in the United
                        States of America. These financial statements are the
                        responsibility of USX's management; our responsibility
                        is to express an opinion on these financial statements
                        based on our audits. We conducted our audits of these
                        statements in accordance with auditing standards
                        generally accepted in the United States of America,
                        which require that we plan and perform the audit to
                        obtain reasonable assurance about whether the financial
                        statements are free of material misstatement. An audit
                        includes examining, on a test basis, evidence supporting
                        the amounts and disclosures in the financial statements,
                        assessing the accounting principles used and significant
                        estimates made by management, and evaluating the overall
                        financial statement presentation. We believe that our
                        audits provide a reasonable basis for our opinion.



                        PricewaterhouseCoopers LLP
                        600 Grant Street, Pittsburgh, Pennsylvania 15219-2794
                        February 7, 2001

                                                                             U-1


                        Consolidated Statement of Operations



                        (Dollars in millions)                                                  2000         1999         1998
                        ---------------------------------------------------------------------------------------------------------
                                                                                                              
                        Revenues and other income:
                         Revenues (Note 6)                                                    $ 40,500     $ 29,068     $ 27,629
                         Dividend and investee income (loss)                                        94          (20)          96
                         Net gains (losses) on disposal of assets (Note 27)                       (739)          21           82
                         Gain on ownership change in
                           Marathon Ashland Petroleum LLC (Note 3)                                  12           17          245
                         Other income                                                               47           33           25
                                                                                              ---------    ---------    ---------
                              Total revenues and other income                                   39,914       29,119       28,077
                                                                                              ---------    ---------    ---------

                        Costs and expenses:
                         Cost of revenues (excludes items shown below)                          31,056       21,679       20,211
                         Selling, general and administrative expenses                              402          203          304
                         Depreciation, depletion and amortization                                1,605        1,254        1,224
                         Taxes other than income taxes                                           4,861        4,433        4,241
                         Exploration expenses                                                      238          238          313
                         Inventory market valuation charges (credits) (Note 15)                      -         (551)         267
                                                                                              ---------    ---------    ---------
                              Total costs and expenses                                          38,162       27,256       26,560
                                                                                              ---------    ---------    ---------

                        Income from operations                                                   1,752        1,863        1,517
                        Net interest and other financial costs (Note 6)                            341          362          279
                        Minority interest in income of
                         Marathon Ashland Petroleum LLC (Note 3)                                   498          447          249
                                                                                              ---------    ---------    ---------
                        Income before income taxes and extraordinary losses                        913        1,054          989
                        Provision for income taxes (Note 11)                                       502          349          315
                                                                                              ---------    ---------    ---------

                        Income before extraordinary losses                                         411          705          674
                        Extraordinary losses (Note 7)                                                -            7            -
                                                                                              ---------    ---------    ---------

                        Net income                                                                 411          698          674
                        Dividends on preferred stock                                                 8            9            9
                                                                                              ---------    ---------    ---------

                        Net income applicable to common stocks                                $    403     $    689     $    665
                        ---------------------------------------------------------------------------------------------------------


                        The accompanying notes are an integral part of these
                        consolidated financial statements.

U-2


                        Income Per Common Share



                        (Dollars in millions, except per share data)                           2000         1999         1998
                        ---------------------------------------------------------------------------------------------------------
                                                                                                              
                        Applicable to Marathon Stock:
                         Net income                                                          $     432    $     654    $     310
                         Per Share Data:
                           Basic                                                                  1.39         2.11         1.06
                           Diluted                                                                1.39         2.11         1.05
                       -----------------------------------------------------------------------------------------------------------
                        Applicable to Steel Stock:
                         Income (loss) before extraordinary losses                            $    (29)    $     42     $    355
                         Extraordinary losses                                                        -            7            -
                                                                                              ---------    ---------    ---------
                         Net income (loss)                                                    $    (29)    $     35     $    355
                         Per Share Data
                           Basic:
                            Income (loss) before extraordinary losses                         $   (.33)    $    .48     $   4.05
                            Extraordinary losses                                                     -          .08            -
                                                                                              ---------    ---------    ---------
                            Net income (loss)                                                 $   (.33)    $    .40     $   4.05
                           Diluted:
                            Income (loss) before extraordinary losses                         $   (.33)    $    .48     $   3.92
                            Extraordinary losses                                                     -          .08            -
                                                                                              ---------    ---------    ---------
                            Net income   (loss)                                               $   (.33)    $    .40     $   3.92
                        ---------------------------------------------------------------------------------------------------------


                        See Note 20, for a description and computation of income
                        per common share.
                        The accompanying notes are an integral part of these
                        consolidated financial statements.

                                                                             U-3


                        Consolidated Balance Sheet



                        (Dollars in millions)                                         December 31             2000         1999
                        --------------------------------------------------------------------------------------------------------
                                                                                                                 
                        Assets
                        Current assets:
                         Cash and cash equivalents                                                        $     559    $     133
                         Receivables, less allowance for doubtful accounts
                           of $60 and $12                                                                     2,888        2,367
                         Receivables subject to a security interest (Note 14)                                   350          350
                         Inventories (Note 15)                                                                2,813        2,627
                         Deferred income tax benefits (Note 11)                                                 261          303
                         Assets held for sale (Note 27)                                                         330           84
                         Other current assets                                                                   131           92
                                                                                                          ---------     --------
                               Total current assets                                                           7,332        5,956

                        Investments and long-term receivables, less reserves of
                         $38 and $3 (Note 12)                                                                   801        1,237
                        Property, plant and equipment - net (Note 21)                                        12,114       12,809
                        Prepaid pensions (Note 9)                                                             2,879        2,629
                        Other noncurrent assets                                                                 275          300
                                                                                                          ---------     --------
                               Total assets                                                               $  23,401    $  22,931
                       ---------------------------------------------------------------------------------------------------------
                        Liabilities
                        Current liabilities:
                         Notes payable   (Note 13)                                                        $     150    $       -
                         Accounts payable                                                                     3,774        3,409
                         Payroll and benefits payable                                                           432          468
                         Accrued taxes                                                                          281          283
                         Accrued interest                                                                       108          107
                         Long-term debt due within one year (Note 14)                                           287           61
                                                                                                          ---------     --------
                               Total current liabilities                                                      5,032        4,328

                        Long-term debt (Note 14)                                                              4,173        4,222
                        Deferred income taxes (Note 11)                                                       2,020        1,839
                        Employee benefits (Note 9)                                                            2,415        2,809
                        Deferred credits and other liabilities                                                  724          691
                        Preferred stock of subsidiary (Note 22)                                                 250          250
                        USX obligated mandatorily redeemable convertible preferred
                         securities of a subsidiary trust holding solely junior subordinated
                         convertible debentures of USX (Note 22)                                                183          183

                        Minority interest in Marathon Ashland Petroleum LLC (Note 3)                          1,840        1,753

                        Stockholders' Equity (Details on pages U-6 and U-7)
                        Preferred stock (Note 23) -
                         6.50% Cumulative Convertible issued - 2,413,487 shares and
                           2,715,287 shares ($121 and $136 liquidation preference, respectively)                  2            3
                        Common stocks:
                         Marathon Stock issued - 312,165,978 shares and 311,767,181 shares
                           (par value $1 per share, authorized 550,000,000 shares)                              312          312
                         Steel Stock issued - 88,767,395 shares and 88,397,714 shares
                           (par value $1 per share, authorized 200,000,000 shares)                               89           88
                         Securities exchangeable solely into Marathon Stock -
                           issued - 281,148 shares and 288,621 shares (Note 3)                                    -            -
                        Treasury common stock, at cost -
                         Marathon Stock - 3,899,714 shares and -0- shares                                      (104)           -
                        Additional paid-in capital                                                            4,676        4,673
                        Deferred compensation                                                                    (8)           -
                        Retained earnings                                                                     1,847        1,807
                        Accumulated other comprehensive income (loss)                                           (50)         (27)
                                                                                                          ---------     --------
                               Total stockholders' equity                                                     6,764        6,856
                                                                                                          ---------     --------
                               Total liabilities and stockholders' equity                                 $  23,401    $  22,931
                        --------------------------------------------------------------------------------------------------------

                        The accompanying notes are an integral part of these
                        consolidated financial statements.

U-4


                        Consolidated Statement of Cash Flows



                        (Dollars in millions)                                                   2000        1999          1998
                        -----------------------------------------------------------------------------------------------------------
                                                                                                             
                        Increase (decrease) in cash and cash equivalents
                        Operating activities:
                        Net income                                                           $      411   $      698   $      674
                        Adjustments to reconcile to net cash provided
                         from operating activities:
                           Extraordinary losses                                                       -            7            -
                           Minority interest in income of
                             Marathon Ashland Petroleum LLC                                         498          447          249
                           Depreciation, depletion and amortization                               1,605        1,254        1,224
                           Exploratory dry well costs                                                86          109          186
                           Inventory market valuation charges (credits)                               -         (551)         267
                           Pensions and other postretirement benefits                              (778)        (220)        (181)
                           Deferred income taxes                                                    149          212          184
                           Gain on ownership change in
                             Marathon Ashland Petroleum LLC                                         (12)         (17)        (245)
                           Net (gains) losses on disposal of assets                                 739          (21)         (82)
                           Changes in: Current receivables  - sold                                    -         (320)         (30)
                                                            - operating turnover                   (375)        (988)         451
                                        Inventories                                                 (46)         (77)          (6)
                                        Current accounts payable and accrued expenses               182        1,251         (497)
                           All other - net                                                           72          152         (172)
                                                                                             ----------   ----------   ----------
                              Net cash provided from operating activities                         2,531        1,936        2,022
                                                                                             ----------   ----------   ----------
                        Investing activities:

                        Capital expenditures                                                     (1,669)      (1,665)      (1,580)
                        Acquisitions - U. S. Steel Kosice s.r.o., net of cash acquired
                                       of $59                                                       (10)           -            -
                                     - Tarragon Oil and Gas Limited                                   -            -         (686)
                        Disposal of assets                                                          560          366           86
                        Restricted cash - withdrawals                                               273           60          241
                                        - deposits                                                 (270)         (61)         (67)
                        Investees - investments                                                    (100)         (74)        (115)
                                  - loans and advances                                              (16)         (70)        (104)
                                  - returns and repayments                                           10            1           71
                        All other - net                                                              29          (25)          (4)
                                                                                             ----------   ----------   ----------
                              Net cash used in investing activities                              (1,193)      (1,468)      (2,158)
                                                                                             ----------   ----------   ----------
                        Financing activities:

                        Commercial paper and revolving credit arrangements - net                     62         (381)         724
                        Other debt - borrowings                                                     273          810        1,036
                                    - repayments                                                   (339)        (242)      (1,445)
                        Common stock    - issued                                                      -           89          668
                                        - repurchased                                              (105)           -         (195)
                        Treasury common stock reissued                                                1            -            -
                        Preferred stock repurchased                                                 (12)          (2)          (8)
                        Dividends paid                                                             (371)        (354)        (342)
                        Distributions to minority shareholder of
                         Marathon Ashland Petroleum LLC                                            (420)        (400)        (211)
                                                                                             ----------   ----------   ----------
                              Net cash provided from (used in) financing activities                (911)        (480)         227
                                                                                             ----------   ----------   ----------
                        Effect of exchange rate changes on cash                                      (1)          (1)           1
                                                                                             ----------   ----------   ----------
                        Net increase (decrease) in cash and cash equivalents                        426          (13)          92

                        Cash and cash equivalents at beginning of year                              133          146           54
                                                                                             ----------   ----------   ----------
                        Cash and cash equivalents at end of year                             $      559   $      133   $      146
                        ---------------------------------------------------------------------------------------------------------


                        See Note 16, for supplemental cash flow information.
                        The accompanying notes are an integral part of these
                        consolidated financial statements.

                                                                             U-5


                        Consolidated Statement of Stockholders' Equity

                        USX has two classes of common stock: USX - Marathon
                        Group Common Stock (Marathon Stock) and USX - U. S.
                        Steel Group Common Stock (Steel Stock), which are
                        intended to reflect the performance of the Marathon and
                        U. S. Steel Groups, respectively. (See Note 8, for a
                        description of the two Groups.) During 1998, USX issued
                        878,074 Exchangeable Shares (exchangeable solely into
                        Marathon Stock) related to the purchase of Tarragon Oil
                        and Gas Limited. (See Note 3.)
                             On all matters where the holders of Marathon Stock
                        and Steel Stock vote together as a single class,
                        Marathon Stock has one vote per share and Steel Stock
                        has a fluctuating vote per share based on the relative
                        market value of a share of Steel Stock to the market
                        value of a share of Marathon Stock. In the event of a
                        disposition of all or substantially all the properties
                        and assets of the U. S. Steel Group, USX must either
                        distribute the net proceeds to the holders of the Steel
                        Stock as a special dividend or in redemption of the
                        stock, or exchange the Steel Stock for the Marathon
                        Stock. In the event of liquidation of USX, the holders
                        of the Marathon Stock and Steel Stock will share in the
                        funds remaining for common stockholders based on the
                        relative market capitalization of the respective
                        Marathon Stock and Steel Stock to the aggregate market
                        capitalization of both classes of common stock.



                                                                          Dollars in millions             Shares in thousands
                                                                      ---------------------------     --------------------------
                                                                        2000      1999      1998       2000       1999      1998
                        --------------------------------------------------------------------------------------------------------
                                                                                                       
                        Preferred stock (Note 23) -
                         6.50% Cumulative Convertible:
                           Balance at beginning of year               $    3    $    3    $    3       2,715     2,768     2,962
                           Repurchased                                    (1)        -         -        (302)      (53)     (194)
                                                                      -------   ------    ------     -------    ------   -------
                           Balance at end of year                     $    2    $    3    $    3       2,413     2,715     2,768
                        --------------------------------------------------------------------------------------------------------
                        Common stocks:
                         Marathon Stock:
                           Balance at beginning of year               $  312    $  308    $  289     311,767   308,459   288,786
                           Issued in public offering                       -         -        17           -        67    17,000
                           Issued for:
                            Employee stock plans                           -         3         2         391     2,903     2,236
                            Dividend Reinvestment and
                              Direct Stock Purchase Plan                   -         -         -           -       120        66
                            Exchangeable Shares                            -         1         -           8       218       371
                                                                      -------   ------    ------     -------   -------   -------
                           Balance at end of year                     $  312    $  312    $  308     312,166   311,767   308,459
                        --------------------------------------------------------------------------------------------------------
                         Steel Stock:
                           Balance at beginning of year               $   88    $   88    $   86      88,398    88,336    86,578
                           Issued for:
                            Employee stock plans                           1         -         2         369        62     1,733
                            Dividend Reinvestment and
                              Direct Stock Purchase Plan                   -         -         -           -         -        25
                                                                      -------   ------    ------     -------    ------   -------
                           Balance at end of year                     $   89    $   88    $   88      88,767    88,398    88,336
                        --------------------------------------------------------------------------------------------------------
                         Securities exchangeable solely into
                          Marathon Stock:
                           Balance at beginning of year               $    -    $    1    $    -         289       507         -
                           Issued to acquire Tarragon stock                -         -         1           -         -       878
                           Exchanged for Marathon Stock                    -        (1)        -          (8)     (218)     (371)
                                                                      -------   ------    ------     -------    ------   -------
                           Balance at end of year                     $    -    $    -    $    1         281       289       507
                        --------------------------------------------------------------------------------------------------------
                        Treasury common stock, at cost -
                         Marathon Stock:
                           Balance at beginning of year               $    -    $    -    $    -           -         -         -
                           Repurchased                                  (105)        -         -      (3,957)        -         -
                           Reissued for:
                            Employee stock plans                           1         -         -          43         -         -
                            Non-employee Board of Directors
                              deferred compensation plan                   -         -         -          14         -         -
                                                                      -------   ------    ------     -------    ------   -------
                           Balance at end of year                     $ (104)   $    -    $    -      (3,900)        -         -
                        --------------------------------------------------------------------------------------------------------


                        (Table continued on next page)

U-6




                                                                           Stockholders' Equity           Comprehensive Income
                                                                       ----------------------------      ------------------------
                        (Dollars in millions)                            2000      1999       1998      2000      1999      1998
                        ----------------------------------------------------------------------------------------------------------
                                                                                                        
                        Additional paid-in capital:
                         Balance at beginning of year                 $ 4,673   $ 4,587    $ 3,924
                         Marathon Stock issued                              9        92        598
                         Steel Stock issued                                 5         2         57
                         Exchangeable Shares:
                           Issued                                           -         -         28
                           Exchanged for Marathon Stock                     -        (6)       (12)
                         Repurchase of 6.50% preferred stock              (11)       (2)        (8)
                                                                      -------   -------    -------
                         Balance at end of year                       $ 4,676   $ 4,673    $ 4,587
                        --------------------------------------------------------------------------
                        Deferred compensation (Note 17)               $    (8)  $     -    $    (1)
                        --------------------------------------------------------------------------
                        Retained earnings:
                         Balance at beginning of year                 $ 1,807   $ 1,467    $ 1,138
                         Net income                                       411       698        674   $   411    $  698    $   674
                         Dividends on preferred stock                      (8)       (9)        (9)
                         Dividends on Marathon Stock
                           (per share:  $.88 in 2000 and
                              $.84 in 1999 and 1998)                     (274)     (261)      (248)
                         Dividends on Steel Stock
                           (per share $1.00)                              (89)      (88)       (88)
                                                                      -------   -------    -------
                         Balance at end of year                       $ 1,847   $ 1,807    $ 1,467
                        --------------------------------------------------------------------------
                        Accumulated other comprehensive income
                         (loss):
                          Minimum pension liability adjustments:
                           Balance at beginning of year               $   (10)  $   (37)   $   (32)
                           Changes during year, net of taxes/(a)/         (11)       27         (5)      (11)       27         (5)
                                                                      -------   -------    -------
                           Balance at end of year                         (21)      (10)       (37)
                                                                      -------   -------    -------
                         Foreign currency translation adjustments:
                           Balance at beginning of year               $   (17)  $   (11)   $    (8)
                           Changes during year, net of taxes/(a)/         (12)       (6)        (3)      (12)       (6)        (3)
                                                                      -------   -------    -------
                           Balance at end of year                         (29)      (17)       (11)
                                                                      -------   -------    -------
                         Unrealized holding losses on investments:
                           Balance at beginning of year               $     -   $     -    $     3
                           Changes during year, net of taxes/(a)/           -        (1)         2         -        (1)         2
                           Reclassification adjustment
                             included in net income                         -         1         (5)        -         1         (5)
                                                                      -------   -------    -------
                           Balance at end of year                           -         -          -
                        --------------------------------------------------------------------------
                               Total balances at end of year          $   (50)  $   (27)   $   (48)
                        ----------------------------------------------------------------------------------------------------------
                                 Total comprehensive income/(b)/                                     $   388    $  719    $   663
                        ----------------------------------------------------------------------------------------------------------
                        Total stockholders' equity                    $ 6,764   $ 6,856    $ 6,405
                        --------------------------------------------------------------------------




                        /(a)/Related income tax provision (credit):        2000    1999      1998
                                                                          -----   -----     -----
                                                                                   
                              Minimum pension liability adjustments       $   4   $ (13)    $   3
                              Foreign currency translation adjustments       (4)      3         4
                              Unrealized holding gains on investments         -       -         2

                        /(b)/Total comprehensive income (loss) by Group:

                              Marathon Group                              $ 419   $ 660     $ 306
                              U. S. Steel Group                             (31)     59       357
                                                                          -----   -----     -----
                                Total                                     $ 388   $ 719     $ 663
                                                                          =====   =====     =====

                        The accompanying notes are an integral part of these
                        consolidated financial statements.

                                                                             U-7


                        Notes to Consolidated Financial Statements

1. Summary of Principal Accounting Policies

                        Principles applied in consolidation - The consolidated
                        financial statements include the accounts of USX
                        Corporation and the majority-owned subsidiaries which it
                        controls (USX).
                             Investments in unincorporated oil and gas joint
                        ventures, undivided interest pipelines and jointly owned
                        gas processing plants are consolidated on a pro rata
                        basis.
                             Investments in entities over which USX has
                        significant influence are accounted for using the equity
                        method of accounting and are carried at USX's share of
                        net assets plus loans and advances.
                             Investments in companies whose stock is publicly
                        traded are carried generally at market value. The
                        difference between the cost of these investments and
                        market value is recorded in other comprehensive income
                        (net of tax). Investments in companies whose stock has
                        no readily determinable fair value are carried at cost.
                             Dividend and investee income includes USX's
                        proportionate share of income from equity method
                        investments and dividend income from other investments.
                        Dividend income is recognized when dividend payments are
                        received.
                             Gains or losses from a change in ownership of a
                        consolidated subsidiary or an unconsolidated investee
                        are recognized in the period of change.

                        Use of estimates - Generally accepted accounting
                        principles require management to make estimates and
                        assumptions that affect the reported amounts of assets
                        and liabilities, the disclosure of contingent assets and
                        liabilities at year-end and the reported amounts of
                        revenues and expenses during the year. Significant items
                        subject to such estimates and assumptions include the
                        carrying value of long-lived assets; valuation
                        allowances for receivables, inventories and deferred
                        income tax assets; environmental liabilities;
                        liabilities for potential tax deficiencies and potential
                        litigation claims and settlements; and assets and
                        obligations related to employee benefits. Additionally,
                        certain estimated liabilities are recorded when
                        management commits to a plan to close an operating
                        facility or to exit a business activity. Actual results
                        could differ from the estimates and assumptions used.

                        Revenue recognition - Revenues are recognized generally
                        when products are shipped or services are provided to
                        customers, the sales price is fixed and determinable,
                        and collectibility is reasonably assured. Costs
                        associated with revenues, including shipping and other
                        transportation costs, are recorded in cost of revenues.
                        Matching buy/sell transactions settled in cash are
                        recorded in both revenues and cost of revenues as
                        separate sales and purchase transactions, with no net
                        effect on income. USX follows the sales method of
                        accounting for gas production imbalances and would
                        recognize a liability if the existing proved reserves
                        were not adequate to cover the current imbalance
                        situation.

                        Cash and cash equivalents - Cash and cash equivalents
                        include cash on hand and on deposit and investments in
                        highly liquid debt instruments with maturities generally
                        of three months or less.

                        Inventories - Inventories are carried at lower of cost
                        or market. Cost of inventories is determined primarily
                        under the last-in, first-out (LIFO) method.

                        Derivative instruments - USX uses commodity-based and
                        foreign currency derivative instruments to manage its
                        exposure to price risk. Management is authorized to use
                        futures, forwards, swaps and options related to the
                        purchase, production or sale of crude oil, natural gas,
                        refined products, nonferrous metals and electricity.
                        While USX's risk management activities generally reduce
                        market risk exposure due to unfavorable commodity price
                        changes for raw material purchases and products sold,
                        such activities can also encompass strategies which
                        assume price risk.

U-8


                             Commodity-Based Hedging Transactions - For
                             transactions that qualify for hedge accounting, the
                             resulting gains or losses are deferred and
                             subsequently recognized in income from operations,
                             as a component of revenues or cost of revenues, in
                             the same period as the underlying physical
                             transaction. To qualify for hedge accounting,
                             derivative positions cannot remain open if the
                             underlying physical market risk has been removed.
                             If such derivative positions remain in place, they
                             would be marked-to-market and accounted for as
                             trading or other activities. Recorded deferred
                             gains or losses are reflected within other current
                             and noncurrent assets or accounts payable and
                             deferred credits and other liabilities, as
                             appropriate.

                             Commodity-Based Trading and Other Activities -
                             Derivative instruments used for trading and other
                             activities are marked-to-market and the resulting
                             gains or losses are recognized in the current
                             period within income from operations. This category
                             also includes the use of derivative instruments
                             that have no offsetting underlying physical market
                             risk.

                             Foreign Currency Transactions - USX uses forward
                             exchange contracts to manage currency risks. Gains
                             or losses related to firm commitments are deferred
                             and recognized concurrent with the underlying
                             transaction. All other gains or losses are
                             recognized in income in the current period as
                             revenues, cost of revenues, interest income or
                             expense, or other income, as appropriate. Forward
                             exchange contracts are recorded as receivables or
                             payables, as appropriate.

                        Property, plant and equipment - USX uses the successful
                        efforts method of accounting for oil and gas producing
                        activities. Costs to acquire mineral interests in oil
                        and gas properties, to drill and equip exploratory wells
                        that find proved reserves, and to drill and equip
                        development wells are capitalized. Costs to drill
                        exploratory wells that do not find proved reserves,
                        geological and geophysical costs, and costs of carrying
                        and retaining unproved properties are expensed.
                             Capitalized costs of producing oil and gas
                        properties are depreciated and depleted by the
                        unit-of-production method. Support equipment and other
                        property, plant and equipment are depreciated over their
                        estimated useful lives.
                             USX evaluates its oil and gas producing properties
                        for impairment of value on a field-by-field basis or, in
                        certain instances, by logical grouping of assets if
                        there is significant shared infrastructure, using
                        undiscounted future cash flows based on total proved
                        reserves. Oil and gas producing properties deemed to be
                        impaired are written down to their fair value, as
                        determined by discounted future cash flows based on
                        total proved and risk-adjusted probable and possible
                        reserves or, if available, comparable market values.
                        Unproved oil and gas properties that are individually
                        significant are periodically assessed for impairment of
                        value, and a loss is recognized at the time of
                        impairment. Other unproved properties are amortized over
                        their remaining holding period.
                             For property, plant and equipment unrelated to oil
                        and gas producing activities, depreciation is generally
                        computed on the straight-line method over their
                        estimated useful lives. USX's method of computing
                        depreciation for domestic steel producing assets
                        modifies straight-line depreciation based on the level
                        of production. The modification factors range from a
                        minimum of 85% at a production level below 81% of
                        capability to a maximum of 105% for a 100% production
                        level. No modification is made at the 95% production
                        level, which is considered to be the normal long-range
                        level.
                             Depletion of mineral properties, other than oil and
                        gas, is based on rates that are expected to amortize
                        capitalized costs over the estimated tonnage of minerals
                        to be removed.
                             Assets unrelated to oil and gas producing
                        activities are evaluated for impairment of value on an
                        individual asset basis or by logical groupings of
                        assets. Assets deemed to be impaired are written down to
                        their fair value, as determined by discounted future
                        cash flows or, if available, comparable market values.
                             When property, plant and equipment depreciated on
                        an individual basis are sold or otherwise disposed of,
                        any gains or losses are reflected in income. Gains on
                        disposal of property, plant and equipment are recognized
                        when earned, which is generally at the time of closing.
                        If a loss on disposal is expected, such losses are
                        recognized when the assets are reclassified as held for
                        sale. Proceeds from disposal of property, plant and
                        equipment depreciated on a group basis are credited to
                        accumulated depreciation, depletion and amortization
                        with no immediate effect on income.

                        Major maintenance activities - USX incurs planned major
                        maintenance costs primarily for refinery turnarounds in
                        the Marathon Group and blast furnace relines in the
                        U.S. Steel Group. Costs associated with refinery
                        turnarounds are expensed in the same annual period as
                        incurred; however, estimated annual turnaround costs are
                        recognized in income throughout the year on a pro rata
                        basis. Costs associated with blast furnace relines are
                        separately capitalized in property, plant and equipment.
                        Such costs are amortized over their estimated useful
                        life, which is generally the period until the next
                        scheduled reline.

                        Environmental liabilities - USX provides for remediation
                        costs and penalties when the responsibility to remediate
                        is probable and the amount of associated costs is
                        reasonably determinable. Generally, the timing of
                        remediation accruals coincides with completion of a
                        feasibility study or the commitment to a formal plan of
                        action. Remediation liabilities are accrued based on
                        estimates of known environmental exposure and are
                        discounted in certain instances. If recoveries of
                        remediation costs from third parties are probable, a
                        receivable is recorded. Estimated abandonment and

                                                                             U-9


                        dismantlement costs of offshore production platforms are
                        accrued based on production of estimated proved oil and
                        gas reserves.

                        Postemployment benefits - USX recognizes an obligation
                        to provide postemployment benefits, primarily for
                        disability-related claims covering indemnity and medical
                        payments. The obligation for these claims and the
                        related periodic costs are measured using actuarial
                        techniques and assumptions, including an appropriate
                        discount rate, analogous to the required methodology for
                        measuring pension and other postretirement benefit
                        obligations. Actuarial gains and losses are deferred and
                        amortized over future periods.

                        Insurance - USX is insured for catastrophic casualty and
                        certain property and business interruption exposures, as
                        well as those risks required to be insured by law or
                        contract. Costs resulting from noninsured losses are
                        charged against income upon occurrence.

                        Reclassifications - Certain reclassifications of prior
                        years' data have been made to conform to 2000
                        classifications.


--------------------------------------------------------------------------------
2. New Accounting Standards

                        In the fourth quarter of 2000, USX adopted the following
                        accounting pronouncements primarily related to the
                        classification of items in the financial statements. The
                        adoption of these new pronouncements had no net effect
                        on the financial position or results of operations of
                        USX, although they required reclassifications of certain
                        amounts in the financial statements, including all prior
                        periods presented.
                            .  In December 1999, the Securities and Exchange
                               Commission (SEC) issued Staff Accounting Bulletin
                               No. 101 (SAB 101) "Revenue Recognition in
                               Financial Statements," which summarizes the SEC
                               staff's interpretations of generally accepted
                               accounting principles related to revenue
                               recognition and classification.
                            .  In 2000, the Emerging Issues Task Force of the
                               Financial Accounting Standards Board (EITF)
                               issued EITF Consensus No. 99-19 "Reporting
                               Revenue Gross as a Principal versus Net as an
                               Agent," which addresses whether certain items
                               should be reported as a reduction of revenue or
                               as a component of both revenues and cost of
                               revenues, and EITF Consensus No. 00-10
                               "Accounting for Shipping and Handling Fees and
                               Costs," which addresses the classification of
                               costs incurred for shipping goods to customers.
                            .  In September 2000, the Financial Accounting
                               Standards Board issued Statement of Financial
                               Accounting Standards No. 140, "Accounting for
                               Transfers and Servicing of Financial Assets and
                               Extinguishments of Liabilities" (SFAS 140). SFAS
                               140 revises the standards for accounting for
                               securitizations and other transfers of financial
                               assets and collateral and requires certain
                               disclosures. USX adopted certain recognition and
                               reclassification provisions of SFAS 140, which
                               were effective for fiscal years ending after
                               December 15, 2000. The remaining provisions of
                               SFAS 140 are effective after March 31, 2001.
                             In June 1998, the Financial Accounting Standards
                        Board issued Statement of Financial Accounting Standards
                        No. 133, "Accounting for Derivative Instruments and
                        Hedging Activities" (SFAS No. 133), which later was
                        amended by SFAS Nos. 137 and 138. This Standard requires
                        recognition of all derivatives as either assets or
                        liabilities at fair value. Changes in fair value will be
                        reflected in either current period net income or other
                        comprehensive income, depending on the designation of
                        the derivative instrument. USX may elect not to
                        designate a derivative instrument as a hedge even if the
                        strategy would be expected to qualify for hedge
                        accounting treatment. The adoption of SFAS No. 133 will
                        change the timing of recognition for derivative gains
                        and losses as compared to previous accounting standards.
                             USX will adopt the Standard effective January 1,
                        2001. The transition adjustment resulting from the
                        adoption of SFAS No. 133 will be reported as a
                        cumulative effect of a change in accounting principle.
                        The unfavorable cumulative effect on net income, net of
                        tax, is expected to approximate $9 million. The
                        unfavorable cumulative effect on other comprehensive
                        income, net of tax, will approximate $7 million. The
                        amounts reported as other comprehensive income will be
                        reflected in net income when the anticipated physical
                        transactions are consummated. It is not possible to
                        estimate the effect that this Standard will have on
                        future results of operations.

--------------------------------------------------------------------------------
3. Business Combinations

                        On November 24, 2000, USX acquired U. S. Steel Kosice
                        s.r.o. (USSK), which is located in the Slovak Republic.
                        USSK was formed in June 2000 to hold the steel
                        operations and related assets of VSZ a.s. (VSZ), a
                        diversified Slovak corporation. The cash purchase price
                        was $69 million. Additional payments to VSZ of not less
                        than $25 million and up to $75 million are contingent
                        upon the future performance of USSK. Additionally, $325
                        million of debt was included with the acquisition. The
                        acquisition was accounted for under the purchase method
                        of accounting. The 2000 results of operations include
                        the operations of USSK from the date of acquisition.

U-10


                             Prior to this transaction, USX and VSZ were equal
                        partners in VSZ U. S. Steel s.r.o. (VSZUSS), a tin mill
                        products manufacturer. The assets of USSK included VSZ's
                        interest in VSZUSS. The acquisition of the remaining
                        interest in VSZUSS was accounted for under the purchase
                        method of accounting. Previously, USX had accounted for
                        its investment in VSZUSS under the equity method of
                        accounting.
                             The following unaudited pro forma data for USX
                        includes the results of operations of USSK for 2000 and
                        1999, giving effect to the acquisition as if it had been
                        consummated at the beginning of the years presented. The
                        pro forma data is based on historical information and
                        does not necessarily reflect the actual results that
                        would have occurred nor is it necessarily indicative of
                        future results of operations. In addition, VSZ did not
                        historically provide carve-out financial information for
                        its steel operations in accordance with generally
                        accepted accounting principles in the United States.
                        Therefore, USX made certain estimates and assumptions
                        regarding revenues and costs in the preparation of the
                        following unaudited pro forma data.



                        (In millions, except per share amounts)                                               2000         1999
                       -----------------------------------------------------------------------------------------------------------
                                                                                                                 
                        Revenues and other income                                                         $  40,876    $  30,121
                        Net income                                                                              489          683
                        Applicable to Steel Stock:
                        Income before extraordinary losses/(a)/                                                  49           27
                         - Per share - basic and diluted                                                        .55          .31
                        Net income/(a)/                                                                          49           20
                         - Per share - basic and diluted                                                        .55          .23
                       -----------------------------------------------------------------------------------------------------------


                        /(a)/ Amounts are net of dividends on preferred stock of
                              $8 million and $9 million in 2000 and 1999,
                              respectively.

                             In August 1998, Marathon Oil Company (Marathon)
                        acquired Tarragon Oil and Gas Limited (Tarragon), a
                        Canadian oil and gas exploration and production company.
                        Securityholders of Tarragon received, at their election,
                        Cdn$14.25 for each Tarragon share, or the economic
                        equivalent in Exchangeable Shares of an indirect
                        Canadian subsidiary of Marathon, which are exchangeable
                        solely on a one-for-one basis into Marathon Stock. The
                        purchase price included cash payments of $686 million,
                        issuance of 878,074 Exchangeable Shares valued at $29
                        million and the assumption of $345 million in debt.
                             The Exchangeable Shares are exchangeable at the
                        option of the holder at any time and automatically
                        redeemable on August 11, 2003 (and, in certain
                        circumstances, as early as August 11, 2001). The holders
                        of Exchangeable Shares are entitled to receive declared
                        dividends equivalent to dividends declared from time to
                        time by USX on Marathon Stock.
                             USX accounted for the acquisition using the
                        purchase method of accounting. The 1998 results of
                        operations include the operations of Marathon Canada
                        Limited, formerly known as Tarragon, commencing August
                        12, 1998.
                             During 1997, Marathon and Ashland Inc. (Ashland)
                        agreed to combine the major elements of their refining,
                        marketing and transportation (RM&T) operations. On
                        January 1, 1998, Marathon transferred certain RM&T net
                        assets to Marathon Ashland Petroleum LLC (MAP), a new
                        consolidated subsidiary. Also on January 1, 1998,
                        Marathon acquired certain RM&T net assets from Ashland
                        in exchange for a 38% interest in MAP. The acquisition
                        was accounted for under the purchase method of
                        accounting. The purchase price was determined to be $1.9
                        billion, based upon an external valuation. The change in
                        Marathon's ownership interest in MAP resulted in a gain
                        of $245 million in 1998. In accordance with MAP closing
                        agreements, Marathon and Ashland have made capital
                        contributions to MAP for environmental improvements. The
                        closing agreements stipulate that ownership interests in
                        MAP will not be adjusted as a result of such
                        contributions. Accordingly, Marathon recognized a gain
                        on ownership change of $12 million in 2000 and $17
                        million in 1999.
                             In connection with the formation of MAP, Marathon
                        and Ashland entered into a Limited Liability Company
                        Agreement dated January 1, 1998 (the LLC Agreement). The
                        LLC Agreement provides for an initial term of MAP
                        expiring on December 31, 2022 (25 years from its
                        formation). The term will automatically be extended for
                        ten-year periods, unless a termination notice is given
                        by either party.
                             Also in connection with the formation of MAP, the
                        parties entered into a Put/Call, Registration Rights and
                        Standstill Agreement (the Put/Call Agreement). The
                        Put/Call Agreement provides that at any time after
                        December 31, 2004, Ashland will have the right to sell
                        to Marathon all of Ashland's ownership interest in MAP,
                        for an amount in cash and/or Marathon or USX debt or
                        equity securities equal to the product of 85% (90% if
                        equity securities are used) of the fair market value of
                        MAP at that time, multiplied by Ashland's percentage
                        interest in MAP. Payment could be made at closing, or at
                        Marathon's option, in three equal annual installments,
                        the first of which would be payable at closing. At any
                        time after December 31, 2004, Marathon will have the
                        right to purchase all of Ashland's ownership interests
                        in MAP, for an amount in cash equal to the product of
                        115% of the fair market value of MAP at that time,
                        multiplied by Ashland's percentage interest in MAP.

                                                                            U-11


--------------------------------------------------------------------------------
4. Transactions Between MAP and Ashland

                        At December 31, 2000 and 1999, MAP had current
                        receivables from Ashland of $35 million and $26 million,
                        respectively, and current payables to Ashland of $2
                        million.
                             MAP has a $190 million revolving credit agreement
                        with Ashland. Interest on borrowings is based on defined
                        short-term market rates. At December 31, 2000 and 1999,
                        there were no borrowings against this facility.
                             During 2000, 1999 and 1998, MAP's sales to Ashland,
                        consisting primarily of petroleum products, were $285
                        million, $198 million and $190 million, respectively,
                        and MAP's purchases of products and services from
                        Ashland were $26 million, $22 million and $47 million,
                        respectively. These transactions were conducted under
                        terms comparable to those with unrelated parties.

--------------------------------------------------------------------------------
5. Discontinued Operations

                        Effective October 31, 1997, USX sold its stock in Delhi
                        Gas Pipeline Corporation and other subsidiaries of USX
                        that comprised all of the Delhi Group. USX elected to
                        use the net proceeds of $195 million, or $20.60 per
                        share, to redeem all shares of Delhi Stock. The net
                        proceeds were distributed to the Delhi shareholders on
                        January 26, 1998. After the redemption, 50,000,000
                        shares of Delhi Stock remain authorized but unissued.

--------------------------------------------------------------------------------
6. Other Items



                        (In millions)                                                      2000          1999           1998
                       -----------------------------------------------------------------------------------------------------------
                                                                                                             
                        Net interest and other financial costs

                           Interest and other financial income:
                              Interest income                                           $     29       $     16       $    35
                              Other                                                            5            (13)            4
                                                                                        --------       --------       -------
                                 Total                                                        34              3            39
                                                                                        --------       --------       -------
                           Interest and other financial costs:
                              Interest incurred                                              328            326           325
                              Less interest capitalized                                       19             26            46
                                                                                        --------       --------       -------
                               Net interest                                                  309            300           279
                              Interest on tax issues                                          17             20            21
                              Financial costs on trust preferred securities                   13             13            13
                              Financial costs on preferred stock of subsidiary                22             22            22
                              Amortization of discounts                                        3              3             6
                              Expenses on sales of accounts receivable                         -             15            21
                              Adjustment to settlement value of indexed debt                   -            (13)          (44)
                              Other                                                           11              5             -
                                                                                        --------       --------       -------
                                 Total                                                       375            365           318
                                                                                        --------       --------       -------
                           Net interest and other financial costs                       $    341       $    362       $   279
                       -----------------------------------------------------------------------------------------------------------


                        Foreign currency transactions

                           For 2000, 1999 and 1998, the aggregate foreign
                           currency transaction gains (losses) included in
                           determining net income were $37 million, $(12)
                           million and $13 million, respectively.

                        Consumer excise taxes

                           Included in revenues and costs and expenses for 2000,
                           1999 and 1998 were $4,344 million, $3,973 million and
                           $3,824 million, respectively, representing consumer
                           excise taxes on petroleum products and merchandise.

--------------------------------------------------------------------------------
7. Extraordinary Losses

                        In 1999, USX irrevocably deposited with a trustee the
                        entire 5.5 million common shares it owned in RTI
                        International Metals, Inc. (RTI). The deposit of the
                        shares resulted in the satisfaction of USX's obligation
                        under its 63/4% Exchangeable Notes (indexed debt) due
                        February 1, 2000. Under the terms of the indenture, the
                        trustee exchanged one RTI share for each note at
                        maturity. All shares were required for satisfaction of
                        the indexed debt; therefore, none reverted back to USX.
                             As a result of the above transaction, USX recorded
                        in 1999 an extraordinary loss of $5 million, net of a $3
                        million income tax benefit, representing prepaid
                        interest expense and the write-off of unamortized debt
                        issue costs, and a pretax charge of $22 million,
                        representing the difference between the carrying value
                        of the investment in RTI and the carrying value of the
                        indexed debt, which is included in net gains (losses) on
                        disposal of assets. Since USX's investment in RTI was
                        attributed to the U. S. Steel Group, the indexed debt
                        was also attributed to the U. S. Steel Group.
                             In 1999, Republic Technologies International, LLC,
                        an equity investee of USX, recorded an extraordinary
                        loss related to the early extinguishment of debt. As a
                        result, USX recorded an extraordinary loss of $2
                        million, net of a $1 million income tax benefit,
                        representing its share of the extraordinary loss.

U-12


--------------------------------------------------------------------------------
8. Group and Segment Information

USX has two classes of common stock: Marathon Stock and Steel Stock, which are
intended to reflect the performance of the Marathon Group and the U. S. Steel
Group, respectively. A description of each group and its products and services
is as follows:

   Marathon Group - The Marathon Group includes Marathon Oil Company and certain
   other subsidiaries of USX. Marathon Group revenues as a percentage of total
   consolidated USX revenues were 85% in 2000, 81% in 1999 and 77% in 1998.

   U. S. Steel Group - The U. S. Steel Group consists of U. S. Steel, the
   largest domestic integrated steel producer and U. S. Steel operations in the
   Slovak Republic. U. S. Steel Group revenues as a percentage of total
   consolidated USX revenues were 15% in 2000, 19% in 1999 and 23% in 1998.

Group Operations:



                                                               Income               Net
                                                                From              Income             Capital
(In millions)                  Year        Revenues          Operations           (Loss)          Expenditures          Assets
--------------------------------------------------------------------------------------------------------------------------------
                                                                                                    
Marathon Group                 2000      $    34,487        $     1,648         $      432         $    1,425         $   15,232
                               1999           23,590              1,713                654              1,378             15,674
                               1998           21,274                938                310              1,270             14,544
--------------------------------------------------------------------------------------------------------------------------------
U. S. Steel Group              2000            6,090                104                (21)               244              8,711
                               1999            5,536                150                 44                287              7,525
                               1998            6,378                579                364                310              6,749
--------------------------------------------------------------------------------------------------------------------------------
Eliminations                   2000              (77)                 -                  -                  -               (542)
                               1999              (58)                 -                  -                  -               (268)
                               1998              (23)                 -                  -                  -               (160)
--------------------------------------------------------------------------------------------------------------------------------
Total USX                      2000      $    40,500        $     1,752         $      411         $    1,669         $   23,401
  Corporation                  1999           29,068              1,863                698              1,665             22,931
                               1998           27,629              1,517                674              1,580             21,133
--------------------------------------------------------------------------------------------------------------------------------




Revenues by Product:
(In millions)                                                                        2000               1999             1998
--------------------------------------------------------------------------------------------------------------------------------
                                                                                                             
Marathon Group
  Refined products                                                              $   22,514         $   15,181         $   12,852
  Merchandise                                                                        2,441              2,194              1,941
  Liquid hydrocarbons                                                                6,856              4,587              5,023
  Natural gas                                                                        2,518              1,429              1,187
  Transportation and other products                                                    158                199                271
--------------------------------------------------------------------------------------------------------------------------------
U. S. Steel Group
  Sheet and semi-finished steel products                                        $    3,288         $    3,433         $    3,598
  Tubular, plate and tin mill products                                               1,731              1,140              1,546
  Raw materials (coal, coke and iron ore)                                              626                549                744
  Other/(a)/                                                                           445                414                490
---------------------------------------------------------------------------------------------------------------------------------


/(a)/  Includes revenue from the sale of steel production by-products,
       engineering and consulting services, real estate development and resource
       management.

Operating Segments:
USX's reportable operating segments are business units within the Marathon and
U. S. Steel Groups, each providing their own unique products and services. Each
operating segment is independently managed and requires different technology and
marketing strategies. Segment income represents income from operations allocable
to operating segments. The following items included in income from operations
are not allocated to operating segments:

      .  Gain on ownership change in MAP
      .  Net pension credits associated with the U. S. Steel Group's pension
         plan assets and liabilities
      .  Certain costs related to former U. S. Steel Group business activities
      .  Certain general and administrative costs related to all Marathon Group
         operating segments in excess of amounts billed to MAP under service
         contracts and amounts charged out to operating segments under
         Marathon's shared services procedures
      .  USX corporate general and administrative costs. These costs primarily
         consist of employment costs including pension effects, professional
         services, facilities and other related costs associated with corporate
         activities.
      .  Inventory market valuation adjustments
      .  Certain other items not allocated to operating segments for business
         performance reporting purposes (see (a) in reconcilement table on page
         U-15)

                                                                            U-13


     The Marathon Group's operations consist of three reportable operating
segments: 1) Exploration and Production (E&P) - explores for and produces crude
oil and natural gas on a worldwide basis; 2) Refining, Marketing and
Transportation (RM&T) - refines, markets and transports crude oil and petroleum
products, primarily in the Midwest and southeastern United States through MAP;
and 3) Other Energy Related Businesses (OERB). Other Energy Related Businesses
is an aggregation of two segments which fall below the quantitative reporting
thresholds: 1) Natural Gas and Crude Oil Marketing and Transportation - markets
and transports its own and third-party natural gas and crude oil in the United
States; and 2) Power Generation - develops, constructs and operates independent
electric power projects worldwide. The U. S. Steel Group consists of two
reportable operating segments: 1) Domestic Steel and 2) U. S. Steel Kosice
(USSK). Domestic Steel includes the United States operations of U. S. Steel,
while USSK includes the U. S. Steel Kosice operations in the Slovak Republic.
Domestic Steel is engaged in the domestic production and sale of steel mill
products, coke and taconite pellets; the management of mineral resources; coal
mining; engineering and consulting services; and real estate development and
management. USSK is engaged in the production and sale of steel mill products
and coke and primarily serves European markets.
     Information on assets by segment is not provided as it is not reviewed by
the chief operating decision maker.



                                                                            Total                              Total
                                                                          Marathon    Domestic              U. S. Steel
(In millions)                             E&P        RM&T       OERB      Segments      Steel      USSK      Segments      Total
-----------------------------------------------------------------------------------------------------------------------------------
                                                                                                
2000
Revenues and other income:
  Customer                             $  4,184   $  28,693   $   1,550    $34,427   $   5,981   $      92    $  6,073   $ 40,500
  Intersegment/(a)/                         412          83          78        573           -           -           -        573
  Intergroup/(a)/                            30           1          29         60          17           -          17         77
  Equity in earnings (losses) of
   unconsolidated investees                  47          22          15         84          (8)          -          (8)        76
  Other                                      21          50          12         83          50           -          50        133
                                       --------   ---------   ---------   --------   ---------   ---------    --------   --------
     Total revenues and other income   $  4,694   $  28,849   $   1,684   $ 35,227   $   6,040   $      92    $  6,132   $ 41,359
                                       ========   =========   =========   ========   =========   =========    ========   ========
Segment income                         $  1,535   $   1,273   $      38   $  2,846   $      23   $       2    $     25   $  2,871
Significant noncash items included
   in segment income - depreciation,
   depletion and amortization/(b)/          723         315           3      1,041         285           4         289      1,330
Capital expenditures/(c)/                   742         656           2      1,400         239           5         244      1,644
---------------------------------------------------------------------------------------------------------------------------------
1999
Revenues and other income:
  Customer                             $  2,856   $  19,962   $     731    $23,549   $   5,519   $       -    $  5,519   $ 29,068
  Intersegment/(a)/                         202          47          40        289           -           -           -        289
  Intergroup/(a)/                            19           -          22         41          17           -          17         58
  Equity in earnings (losses) of
   unconsolidated investees                  (2)         17          26         41         (43)          -         (43)        (2)
  Other                                      30          50          15         95          46           -          46        141
                                       --------   ---------   ---------   --------   ---------   ---------    --------   --------
     Total revenues and other income   $  3,105   $  20,076   $     834   $ 24,015   $   5,539   $       -    $  5,539   $ 29,554
                                       ========   =========   =========   ========   =========   =========    ========   ========
Segment income                         $    618   $     611   $      61    $ 1,290   $      91   $       -    $     91   $  1,381
Significant noncash items included
   in segment income - depreciation,
   depletion and amortization/(b)/          638         280           5        923         304           -         304      1,227
Capital expenditures/(c)/                   744         612           4      1,360         286           -         286      1,646
---------------------------------------------------------------------------------------------------------------------------------
1998
Revenues and other income:
  Customer                             $  1,905   $  19,018   $     306    $21,229   $   6,374   $       -    $  6,374   $ 27,603
  Intersegment/(a)/                         144          10          17        171           -           -           -        171
  Intergroup/(a)/                            13           -           7         20           2           -           2         22
  Equity in earnings of
   unconsolidated investees                   2          12          14         28          46           -          46         74
  Other                                      26          40          11         77          55           -          55        132
                                       --------   ---------   ---------   --------   ---------   ---------    --------   --------
     Total revenues and other income   $  2,090   $  19,080   $     355   $ 21,525   $   6,477   $       -    $  6,477   $ 28,002
                                       ========   =========   =========   ========   =========   =========    ========   ========
Segment income                         $    278   $     896   $      33    $ 1,207   $     517   $       -    $    517   $  1,724
Significant noncash items included
   in segment income - depreciation,
   depletion and amortization/(b)/          581         272           6        859         283           -         283      1,142
Capital expenditures/(c)/                   839         410           8      1,257         305           -         305      1,562
---------------------------------------------------------------------------------------------------------------------------------



/(a)/  Intersegment and intergroup revenues and transfers were conducted under
       terms comparable to those with unrelated parties.
/(b)/  Differences between segment totals and consolidated totals represent
       amounts included in administrative expenses, international and domestic
       oil and gas property impairments and impairment of coal assets.
/(c)/  Differences between segment totals and consolidated totals represent
       amounts related to corporate administrative activities.

U-14


     The following schedules reconcile segment amounts to amounts reported in
the Groups' financial statements:



                                                                 Marathon Group                         U. S. Steel Group
                                                     -------------------------------------   -------------------------------------
(In millions)                                            2000         1999         1998          2000         1999         1998
----------------------------------------------------------------------------------------------------------------------------------
                                                                                                     
Revenues and Other Income:
  Revenues and other income of
   reportable segments                               $  35,227    $   24,015    $  21,525    $   6,132    $   5,539    $   6,477
  Items not allocated to segments:
   Joint venture formation charges                        (931)            -            -            -            -            -
   Gain on ownership change in MAP                          12            17          245            -            -            -
   Losses on certain equity investments                      -             -            -            -          (69)           -
   Other                                                   124           (36)          24            -            -            -
  Elimination of intersegment revenues                    (573)         (289)        (171)           -            -            -
                                                     ---------    ----------    ---------    ---------    ---------    ---------
     Total Group revenues and other income           $  33,859    $   23,707    $  21,623    $   6,132    $   5,470    $   6,477
                                                     =========    ==========    =========    =========    =========    =========
Income:
  Income for reportable segments                     $   2,846    $    1,290    $   1,207    $      25    $      91    $     517
  Items not allocated to segments:
   Joint venture formation charges                        (931)            -            -            -            -            -
   Gain on ownership change in MAP                          12            17          245            -            -            -
   Administrative expenses                                (136)         (108)        (106)         (25)         (17)         (24)
   Net pension credits                                       -             -            -          266          228          186
   Costs related to former business activities               -             -            -          (91)         (83)        (100)
   Inventory market valuation adjustments                    -           551         (267)           -            -            -
   Other/(a)/                                             (143)          (37)        (141)         (71)         (69)           -
                                                     ---------    ----------    ---------    ---------    ---------    ---------
     Total Group income from operations              $   1,648    $    1,713    $     938    $     104    $     150    $     579
----------------------------------------------------------------------------------------------------------------------------------


/(a)/ Represents in 2000, for the Marathon Group, certain oil and gas property
      impairments, net gains on certain asset sales and reorganization charges
      and for the U. S. Steel Group, impairment of coal assets. Represents in
      1999, for the Marathon Group, primarily certain oil and gas property
      impairments, costs of a voluntary early retirement program and net losses
      on certain asset sales and, for the U. S. Steel Group, certain losses
      related to investments in equity investees. Represents in 1998, certain
      international oil and gas property impairments, certain suspended
      exploration well write-offs, a gas contract settlement and MAP transition
      charges.

Geographic Area:
     The information below summarizes the operations in different geographic
areas. Transfers between geographic areas are at prices which approximate
market.



                                                                           Revenues and Other Income
                                                             --------------------------------------------------
                                                               Within               Between
(In millions)                                Year          Geographic Areas     Geographic Areas         Total          Assets/(a)/
-----------------------------------------------------------------------------------------------------------------------------------
                                                                                                        
Marathon Group:
      United States                          2000             $  32,239           $        -         $   32,239        $   6,711
                                             1999                22,716                    -             22,716            7,555
                                             1998                20,837                    -             20,837            7,659

      Canada                                 2000                   856                  899              1,755              940
                                             1999                   426                  521                947            1,112
                                             1998                   209                  368                577            1,094

      United Kingdom                         2000                   567                    -                567            1,698
                                             1999                   459                    -                459            1,581
                                             1998                   462                    -                462            1,739

      Other Foreign Countries                2000                   197                  188                385              310
                                             1999                   106                   88                194              735
                                             1998                   115                   52                167              468

      Eliminations                           2000                     -               (1,087)            (1,087)               -
                                             1999                     -                 (609)              (609)               -
                                             1998                     -                 (420)              (420)               -

      Total Marathon Group                   2000             $  33,859           $        -         $   33,859        $   9,659
                                             1999                23,707                    -             23,707           10,983
                                             1998                21,623                    -             21,623           10,960
-----------------------------------------------------------------------------------------------------------------------------------
U. S. Steel Group:
      United States                          2000             $   6,027           $        -         $    6,027        $   2,745
                                             1999                 5,452                    -              5,452            2,889
                                             1998                 6,460                    -              6,460            3,043

      Foreign Countries                      2000                   105                    -                105              386
                                             1999                    18                    -                 18               63
                                             1998                    17                    -                 17               69

      Total U. S. Steel Group                2000             $   6,132           $        -         $    6,132        $   3,131
                                             1999                 5,470                    -              5,470            2,952
                                             1998                 6,477                    -              6,477            3,112
-----------------------------------------------------------------------------------------------------------------------------------
Eliminations                                 2000             $     (77)          $        -         $      (77)       $       -
                                             1999                   (58)                   -                (58)               -
                                             1998                   (23)                   -                (23)               -
-----------------------------------------------------------------------------------------------------------------------------------
Total USX Corporation                        2000             $  39,914           $        -         $   39,914        $  12,790
                                             1999                29,119                    -             29,119           13,935
                                             1998                28,077                    -             28,077           14,072
-----------------------------------------------------------------------------------------------------------------------------------


/(a)/ Includes property, plant and equipment and investments.

                                                                            U-15


--------------------------------------------------------------------------------
9. Pensions and Other Postretirement Benefits

                        USX has noncontributory defined benefit pension plans
                        covering substantially all U.S. employees. Benefits
                        under these plans are primarily based upon years of
                        service and final average pensionable earnings, or a
                        minimum benefit based upon years of service, whichever
                        is greater. In addition, pension benefits based upon a
                        percent of total career pensionable earnings cover
                        certain participating salaried employees.
                             USX also has defined benefit retiree health care
                        and life insurance plans (other benefits) covering most
                        U.S. employees upon their retirement. Health care
                        benefits are provided through comprehensive hospital,
                        surgical and major medical benefit provisions or through
                        health maintenance organizations, both subject to
                        various cost sharing features. Life insurance benefits
                        are provided to certain nonunion and union represented
                        retiree beneficiaries primarily based on employees'
                        annual base salary at retirement. For most U.S. union
                        retirees, benefits are provided for the most part based
                        on fixed amounts negotiated in labor contracts with the
                        appropriate unions.



                                                                               Pension Benefits               Other Benefits
                                                                            ----------------------        -----------------------
                        (In millions)                                         2000          1999            2000           1999
                       -----------------------------------------------------------------------------------------------------------
                                                                                                            
                        Change in benefit obligations
                        Benefit obligations at January 1                    $ 7,584        $ 8,629        $  2,374       $  2,710
                        Service cost                                            128            152              26             32
                        Interest cost                                           572            540             184            169
                        Plan amendments                                           6            399 /(a)/         1            (30)
                        Actuarial (gains) losses                                551         (1,019)            306           (333)
                        Plan mergers and acquisitions                             -             56               -             11
                        Settlements, curtailments and termination benefits      (99)          (329)             22              -
                        Benefits paid                                          (883)          (844)           (189)          (185)
                                                                            -------        -------        --------       --------
                        Benefit obligations at December 31                  $ 7,859        $ 7,584        $  2,724       $  2,374
                       -----------------------------------------------------------------------------------------------------------
                        Change in plan assets
                        Fair value of plan assets at January 1              $11,305        $11,574        $    281       $    265
                        Actual return on plan assets                            131            865              26             20
                        Plan merger and acquisitions                             (1)            38               -              1
                        Employer contributions                                    1              2             576 /(b)/       34
                        Trustee distributions/(c)/                              (34)           (30)              -              -
                        Settlements paid                                       (134)          (306)              -              -
                        Benefits paid from plan assets                         (877)          (838)            (41)           (39)
                                                                            -------        -------        --------       --------
                        Fair value of plan assets at December 31            $10,391        $11,305        $    842       $    281
                       -----------------------------------------------------------------------------------------------------------
                        Funded status of plans at December 31               $ 2,532 /(d)/  $ 3,721 /(d)/  $ (1,882)      $ (2,093)
                        Unrecognized net gain from transition                   (20)           (95)              -              -
                        Unrecognized prior service costs (credits)              778            880             (47)           (53)
                        Unrecognized net actuarial gains                       (499)        (1,945)           (126)          (458)
                        Additional minimum liability/(e)/                       (38)           (24)              -              -
                                                                            -------        -------        --------       --------
                        Prepaid (accrued) benefit cost                      $ 2,753        $ 2,537        $ (2,055)      $ (2,604)
                       -----------------------------------------------------------------------------------------------------------
                        /(a)/ Results primarily from a five-year labor contract
                              with the United Steelworkers of America ratified
                              in August 1999.
                        /(b)/ Includes for the U. S. Steel Group, contributions
                              of $530 million to a Voluntary Employee Benefit
                              Association trust, comprised of $30 million in
                              contractual requirements and an elective
                              contribution of $500 million. Also includes for
                              the U. S. Steel Group, a $30 million elective
                              contribution to the non-union retiree life
                              insurance trust.
                        /(c)/ Represents transfers of excess pension assets to
                              fund retiree health care benefits accounts under
                              Section 420 of the Internal Revenue Code.
                        /(d)/ Includes several plans that have accumulated
                               benefit obligations in excess of plan assets:
                                Aggregate accumulated benefit obligations   $   (74)       $   (53)
                                Aggregate projected benefit obligations         (92)           (76)
                                Aggregate plan assets                             -              -
                        /(e)/ Additional minimum liability recorded was offset
                              by the following:
                               Intangible asset                             $     6        $     9
                                                                            -------        -------
                               Accumulated other comprehensive income (losses):
                                 Beginning of year                          $   (10)       $   (37)
                                 Change during year (net of tax)                (11)            27
                                                                            -------        -------
                                 Balance at end of year                     $   (21)       $   (10)

                       -----------------------------------------------------------------------------------------------------------



U-16




                                                                      Pension Benefits                   Other Benefits
                                                               -----------------------------    -------------------------------
                    (In millions)                                 2000      1999       1998       2000        1999        1998
                   ------------------------------------------------------------------------------------------------------------
                                                                                                        
                    Components of net periodic
                     benefit cost (credit)
                    Service cost                                $  128     $ 152       $ 119      $  26        $ 32      $  27
                    Interest cost                                  572       540         544        184         169        172
                    Expected return on plan assets                (958)     (895)       (876)       (24)        (21)       (21)
                    Amortization -net transition gain              (71)      (72)        (74)         -           -          -
                                 -prior service costs (credits)    102        87          75         (6)         (4)         1
                                 -actuarial (gains) losses         (53)        7           6        (26)         (5)       (13)
                    Multiemployer and other USX plans                5         5           6          9 /(a)/     7 /(a)/   13 /(a)/
                    Settlement and termination (gains) losses       32 /b)/  (42) /(b)/   10 /(b)/   21 /(b)/     -          -
                                                                ------      ----        ----       ----        ----      -----
                    Net periodic benefit cost (credit)          $ (243)    $(218)      $(190)     $ 184        $178      $ 179
                   -----------------------------------------------------------------------------------------------------------


                    /(a)/ Represents payments to a multiemployer health care
                          benefit plan created by the Coal Industry Retiree
                          Health Benefit Act of 1992 based on assigned
                          beneficiaries receiving benefits. The present value of
                          this unrecognized obligation is broadly estimated to
                          be $84 million, including the effects of future
                          medical inflation, and this amount could increase if
                          additional beneficiaries are assigned.
                    /(b)/ Relates primarily to voluntary early retirement
                          programs.



                                                                              Pension Benefits              Other Benefits
                                                                          -----------------------        ---------------------
                                                                              2000         1999            2000        1999
                   -----------------------------------------------------------------------------------------------------------
                                                                                                          
                    Weighted average actuarial assumptions at December 31:
                    Discount rate                                              7.5%         8.0%             7.5%       8.0%
                    Expected annual return on plan assets                      9.0%         8.6%             8.5%       8.5%
                    Increase in compensation rate                              4.1%         4.1%             4.1%       4.1%
                   -----------------------------------------------------------------------------------------------------------


                         For measurement purposes, a 7.6% annual rate of
                    increase in the per capita cost of covered health care
                    benefits was assumed for 2001. The rate was assumed to
                    decrease gradually to 5% in 2006 for the U. S. Steel
                    Group and in 2007 for the Marathon Group and remain at
                    that level thereafter.
                         A one-percentage-point change in assumed health
                    care cost trend rates would have the following effects:



                                                                                            1-Percentage-      1-Percentage-
                    (In millions)                                                           Point Increase     Point Decrease
                   -----------------------------------------------------------------------------------------------------------
                                                                                                         
                    Effect on total of service and interest cost components                    $    25            $   (21)
                    Effect on other postretirement benefit obligations                             248               (209)
                   -----------------------------------------------------------------------------------------------------------


--------------------------------------------------------------------------------
10. Leases

                    Future minimum commitments for capital leases (including
                    sale-leasebacks accounted for as financings) and for
                    operating leases having remaining noncancelable lease terms
                    in excess of one year are as follows:



                                                                                                             Capital     Operating
                        (In millions)                                                                        Leases       Leases
                       -----------------------------------------------------------------------------------------------------------
                                                                                                                
                        2001                                                                              $      12    $     173
                        2002                                                                                     12          139
                        2003                                                                                     12           98
                        2004                                                                                     12           87
                        2005                                                                                     12          141
                        Later years                                                                              89          173
                        Sublease rentals                                                                          -          (80)
                                                                                                          ---------    ---------
                               Total minimum lease payments                                                     149    $     731
                                                                                                                       =========
                        Less imputed interest costs                                                              54
                                                                                                          ---------
                               Present value of net minimum lease payments
                                 included in long-term debt                                               $      95
                       -----------------------------------------------------------------------------------------------------------


                             Operating lease rental expense:
                        (In millions)                                                            2000         1999         1998
                       -----------------------------------------------------------------------------------------------------------
                                                                                                                 
                         Minimum rental                                                         $  288       $  273       $  288
                         Contingent rental                                                          30           29           29
                         Sublease rentals                                                          (19)         (19)         (14)
                                                                                                ------       ------       ------
                               Net rental expense                                               $  299       $  283       $  303
                       -----------------------------------------------------------------------------------------------------------


                             USX leases a wide variety of facilities and
                        equipment under operating leases, including land and
                        building space, office equipment, production facilities
                        and transportation equipment. Most long-term leases
                        include renewal options and, in certain leases, purchase
                        options. In the event of a change in control of USX, as
                        defined in the agreements, or certain other
                        circumstances, operating lease obligations totaling $104
                        million may be declared immediately due and payable.

                                                                            U-17


--------------------------------------------------------------------------------
11. Income Taxes



                        Provisions (credits) for income taxes were:
                                                   2000                            1999                           1998
                                       -----------------------------    ---------------------------   --------------------------
                        (In millions)   Current    Deferred    Total    Current  Deferred     Total    Current  Deferred   Total
                       ---------------------------------------------------------------------------------------------------------
                                                                                              
                        Federal          $ 257      $ 196     $ 453      $ 107    $ 257      $ 364     $ 102     $ 168     $ 270
                        State and local     41          3        44          4        1          5        33        18        51
                        Foreign             55        (50)        5         26      (46)       (20)       (4)       (2)       (6)
                                         -----      -----     -----      -----    -----      -----     -----     -----     -----
                            Total        $ 353      $ 149     $ 502      $ 137    $ 212      $ 349     $ 131     $ 184     $ 315
                       ---------------------------------------------------------------------------------------------------------


                             A reconciliation of federal statutory tax rate (35%) to total provisions follows:
                        (In millions)                                                            2000       1999        1998
                       -------------------------------------------------------------------------------------------------------
                                                                                                             
                        Statutory rate applied to income before income taxes                  $    320    $    369    $    346
                        Effects of foreign operations:
                         Impairment of deferred tax benefits                                       235           -           -
                         Adjustments to foreign valuation allowances                               (30)          -           -
                         All other, including foreign tax credits                                  (35)        (20)        (37)
                        State and local income taxes after federal income tax effects               29           3          33
                        Credits other than foreign tax credits                                     (10)        (10)        (12)
                        Excess percentage depletion                                                 (3)         (7)        (11)
                        Effects of partially owned companies                                        (5)         (5)         (4)
                        Dispositions of subsidiary investments                                       -           7           -
                        Adjustment of prior years' federal income taxes                             (6)          4          (5)
                        Other                                                                        7           8           5
                                                                                              --------    --------    --------
                              Total provisions                                                $    502    $    349    $    315
                       -------------------------------------------------------------------------------------------------------




                             Deferred tax assets and liabilities resulted from the following:


                        (In millions)                                                 December 31           2000        1999
                       -----------------------------------------------------------------------------------------------------------
                                                                                                             
                        Deferred tax assets:
                         Minimum tax credit carryforwards                                                 $     39    $   131
                         State tax loss carryforwards (expiring in 2001 through 2020)                          125        122
                         Foreign tax loss carryforwards (portion of which expire in 2001 through 2015)         269        408
                         Employee benefits                                                                   1,028      1,204
                         Expected federal benefit for:
                           Crediting certain foreign deferred income taxes                                     315        530
                           Deducting state deferred income taxes                                                36         36
                         Receivables, payables and debt                                                         93         82
                         Contingency and other accruals                                                        226        202
                         Investments in foreign subsidiaries                                                    39         52
                         Other                                                                                  62         45
                         Valuation allowances:
                           Federal                                                                               -        (30)
                           State                                                                               (50)       (52)
                           Foreign                                                                            (252)      (282)
                                                                                                          --------   --------
                               Total deferred tax assets/(a)/                                                1,930      2,448
                                                                                                          --------   --------
                        Deferred tax liabilities:
                         Property, plant and equipment                                                       1,890      2,365
                         Prepaid pensions                                                                    1,165      1,048
                         Inventory                                                                             335        340
                         Investments in subsidiaries and equity investees                                       52         76
                         Other                                                                                 221        155
                                                                                                          --------   --------
                               Total deferred tax liabilities                                                3,663      3,984
                                                                                                          --------   --------
                                  Net deferred tax liabilities                                            $  1,733    $ 1,536
                       -----------------------------------------------------------------------------------------------------------


                        /(a)/ USX expects to generate sufficient future taxable
                              income to realize the benefit of its deferred tax
                              assets. In addition, the ability to realize the
                              benefit of foreign tax credits is based upon
                              certain assumptions concerning future operating
                              conditions (particularly as related to prevailing
                              oil prices), income generated from foreign sources
                              and USX's tax profile in the years that such
                              credits may be claimed. During 2000, the amount of
                              net deferred tax assets expected to be realized
                              was reduced as a result of the change in the
                              amount and timing of future foreign source income
                              due to the exchange of Marathon's interest in
                              Sakhalin Energy Investment Company Ltd. (Sakhalin
                              Energy) for other oil and gas producing interests.
                              Additionally, gross deferred tax assets and the
                              associated valuation allowance were reduced by a
                              change in management's intent regarding the
                              permanent reinvestment of the earnings from
                              certain foreign subsidiaries.

                                The consolidated tax returns of USX for the
                        years 1990 through 1997 are under various stages of
                        audit and administrative review by the IRS. USX believes
                        it has made adequate provision for income taxes and
                        interest which may become payable for years not yet
                        settled.
                                Pretax income (loss) included $245 million, $63
                        million and $(75) million attributable to foreign
                        sources in 2000, 1999 and 1998, respectively.

U-18


                             Undistributed earnings of certain consolidated
                        foreign subsidiaries at December 31, 2000, amounted to
                        $223 million. No provision for deferred U.S. income
                        taxes has been made for these subsidiaries because USX
                        intends to permanently reinvest such earnings in those
                        foreign operations. If such earnings were not
                        permanently reinvested, a deferred tax liability of $78
                        million would have been required.

--------------------------------------------------------------------------------
12. Investments and Long-Term Receivables



                        (In millions)                                                  December 31           2000         1999
                        ---------------------------------------------------------------------------------------------------------
                                                                                                              
                        Equity method investments                                                         $     575    $   1,055
                        Other investments                                                                       101           71
                        Receivables due after one year                                                           59           57
                        Deposits of restricted cash                                                              19           22
                        Other                                                                                    47           32
                                                                                                          ---------    ---------
                               Total                                                                      $     801    $   1,237
                        --------------------------------------------------------------------------------------------------------

                             Summarized financial information of investees
                        accounted for by the equity method of accounting
                        follows:



                        (In millions)                                                            2000         1999         1998
                        --------------------------------------------------------------------------------------------------------
                                                                                                              
                        Income data - year:
                         Revenues and other income                                            $  3,901    $   3,449    $   3,510
                         Operating income                                                          286           95          324
                         Net income (loss)                                                         (43)         (74)         176
                       ---------------------------------------------------------------------------------------------------------
                        Balance sheet data - December 31:
                         Current assets                                                       $  1,239    $   1,382
                         Noncurrent assets                                                       3,443        5,008
                         Current liabilities                                                     1,427        1,481
                         Noncurrent liabilities                                                  1,957        2,317
                       ---------------------------------------------------------------------------------------------------------


                             In 2000, Marathon exchanged its investment in
                        Sakhalin Energy for a working interest in the Foinaven
                        field located in the Atlantic Margin offshore the United
                        Kingdom and an overriding royalty interest in an eight
                        block area in the Gulf of Mexico, which includes the
                        Ursa field. Additionally, Marathon received
                        reimbursement for amounts advanced to Sakhalin Energy in
                        2000 and a cash settlement for certain other activities
                        in 2000. The transaction was recorded at fair value and
                        resulted in a pretax gain on disposal of assets of $58
                        million.
                             USX acquired a 25% interest in VSZ during 2000. VSZ
                        does not provide its shareholders with financial
                        statements prepared in accordance with generally
                        accepted accounting principles in the United States
                        (USGAAP). Although shares of VSZ are traded on the
                        Bratislava Stock Exchange, those securities do not have
                        a readily determinable fair value as defined under
                        USGAAP. Accordingly, USX accounts for its investment in
                        VSZ under the cost method of accounting.
                             In 1999, USX and Kobe Steel, Ltd. (Kobe Steel)
                        completed a transaction that combined the steelmaking
                        and bar producing assets of USS/Kobe Steel Company
                        (USS/Kobe) with companies controlled by Blackstone
                        Capital Partners II. The combined entity was named
                        Republic Technologies International, LLC and is a wholly
                        owned subsidiary of Republic Technologies International
                        Holdings, LLC (Republic). As a result of this
                        transaction, USX recorded $47 million in charges related
                        to the impairment of the carrying value of its
                        investment in USS/Kobe and costs related to the
                        formation of Republic. These charges were included in
                        dividend and investee income (loss) in 1999. In
                        addition, USX made a $15 million equity investment in
                        Republic. USX owned 50% of USS/Kobe and now owns 16% of
                        Republic. USX accounts for its investment in Republic
                        under the equity method of accounting. The seamless pipe
                        business of USS/Kobe was excluded from this transaction.
                        That business, now known as Lorain Tubular Company, LLC,
                        became a wholly owned subsidiary of USX at the close of
                        business on December 31, 1999.
                             Dividends and partnership distributions received
                        from equity investees were $56 million in 2000, $46
                        million in 1999 and $42 million in 1998.
                             USX purchases from equity investees totaled $627
                        million, $411 million and $395 million in 2000, 1999 and
                        1998, respectively. USX sales to equity investees
                        totaled $986 million, $853 million and $747 million in
                        2000, 1999 and 1998, respectively.
--------------------------------------------------------------------------------
13. Short-Term Debt

                        In November 2000, USX entered into a $451 million
                        364-day revolving credit agreement, which terminates in
                        November 2001. Interest is based on defined short-term
                        market rates. During the term of the agreement, USX is
                        obligated to pay a variable facility fee on total
                        commitments, which at December 31, 2000 was .10%. At
                        December 31, 2000, there were no borrowings against this
                        facility. USX has a short-term line of credit totaling
                        $150 million, bearing interest at a defined short-term
                        market rate, which at December 31, 2000 was 7.10%. At
                        December 31, 2000, USX had borrowed $150 million against
                        this facility. Certain other banks provide short-term
                        lines of credit totaling $150 million which require a
                        .125% fee or maintenance of compensating balances of 3%.
                        At December 31, 2000, there were no borrowings against
                        these facilities.

                                                                            U-19


                        MAP has a $100 million short-term revolving credit
                        facility that terminates in July 2001. Interest is based
                        on defined short-term market rates. During the term of
                        the agreement, MAP is required to pay a variable
                        facility fee on total commitments, which at December 31,
                        2000 was .11%. At December 31, 2000, there were no
                        borrowings against this facility.
                             USSK has a short-term $50 million credit facility
                        that expires in November 2001. The facility, which is
                        non-recourse to USX, bears interest on prevailing
                        short-term market rates plus 1%. USSK is obligated to
                        pay a .25% commitment fee on undrawn amounts. At
                        December 31, 2000, there were no borrowings against this
                        facility.

--------------------------------------------------------------------------------
14.  Long-Term Debt



                                                                                Interest                          December 31
                        (In millions)                                           Rates - %       Maturity       2000         1999
                        -----------------------------------------------------------------------------------------------------------
                                                                                                             
                        USX Corporation:
                         Revolving credit facility/(a)/                                           2005       $  300       $  300
                         Commercial paper/(a)/                                  7.68                             77          165
                         Notes payable                                          6 13/20 - 9 4/5 2001 - 2023   2,505        2,525
                         Obligations relating to Industrial Development and
                           Environmental Improvement Bonds and Notes/(b)/       4 1/4 - 6 7/8   2009 - 2033     494          494
                         Receivables facility/(c)/                                                2004          350          350
                         All other obligations, including sale-leaseback
                           financing and capital leases                                         2001 - 2012      88           92
                        Consolidated subsidiaries:
                         Revolving credit facilities/(d)/                                       2001 - 2003       -            -
                         USSK loan facility/(e)/                                8 1/2             2010          325            -
                         Guaranteed Notes                                       7                 2002          135          135
                         Guaranteed Loan/(f)/                                   9 1/20          2001 - 2006     199          223
                         Notes payable                                          8 1/2              2001           1            1
                         All other obligations, including capital leases                        2001 - 2011      11           26
                                                                                                             ------      -------
                              Total/(g)(h)/                                                                   4,485        4,311
                        Less unamortized discount                                                                25           28
                        Less amount due within one year                                                         287           61
                                                                                                             ------      -------
                              Long-term debt due after one year                                              $4,173       $4,222
                       -----------------------------------------------------------------------------------------------------------

                       /(a)/ In November 2000, USX entered into a $1,354 million
                             5-year revolving credit agreement, terminating in
                             November 2005, which in conjunction with a $451
                             million 364-day revolving credit agreement,
                             terminating in December 2001, replaced the prior
                             $2,350 million facility. Interest on the facility
                             is based on defined short-term market rates. During
                             the term of the agreement, USX is obligated to pay
                             a variable facility fee on total commitments, which
                             at December 31, 2000 was .125%. At December 31,
                             2000, $300 million had been borrowed against this
                             facility. The commercial paper is supported by the
                             unused and available credit on the 5-year facility
                             and, accordingly, is classified as long-term debt.
                       /(b)/ At December 31, 2000, USX had outstanding
                             obligations relating to Environmental Improvement
                             Bonds in the amount of $141 million, which were
                             supported by letter of credit arrangements that
                             could become short-term obligations under certain
                             circumstances.
                       /(c)/ In December 1999, USX entered into an agreement
                             under which the U. S. Steel Group participates in a
                             program to sell an undivided interest in certain
                             accounts receivable. A previous program expired in
                             October 1999 and was accounted for as a transfer of
                             receivables. The new program is accounted for as a
                             secured borrowing. Payments are collected from sold
                             accounts receivable and invested in new accounts
                             receivable for the purchaser and a yield, based on
                             short-term market rates, is transferred to the
                             purchaser. If the U. S. Steel Group does not have
                             sufficient eligible receivables to reinvest for the
                             purchaser, the size of the program is reduced
                             accordingly. The purchaser has a security interest
                             in a pool of receivables to secure USX's
                             obligations under the program. If the receivables
                             facility is not renewed annually, the balance
                             outstanding of such facility could be refinanced by
                             the 5-year facility discussed in (a), or another
                             long-term debt source; and therefore, is classified
                             as long-term debt. The amounts sold under the
                             previous receivables programs averaged $291 million
                             and $347 million for the years 1999 and 1998,
                             respectively.
                       /(d)/ MAP has a $400 million revolving credit facility
                             that terminates in July 2003. Interest is based on
                             defined short-term market rates. During the term of
                             the agreement, MAP is required to pay a variable
                             facility fee on total commitments, which at
                             December 31, 2000 was .125%. At December 31, 2000,
                             the unused and available credit was $352 million,
                             which reflects reductions for outstanding letters
                             of credit. In the event that MAP defaults on
                             indebtedness (as defined in the agreement) in
                             excess of $100 million, USX has guaranteed the
                             payment of any outstanding obligations.
                       /(e)/ USSK has a loan facility with a group of financial
                             institutions aggregating $325 million. The loan,
                             which is non-recourse to USX, bears interest at a
                             fixed rate of 8.5% per annum. The loan is subject
                             to annual repayments of $20 million beginning in
                             2003, with the balance due in 2010. Mandatory
                             prepayments of the loan may be required based upon
                             a cash flow formula or a change in control of USX.
                       /(f)/ The Guaranteed Loan was used to fund a portion of
                             the costs in connection with the development of the
                             East Brae Field and the SAGE pipeline in the North
                             Sea. A portion of proceeds from a long-term gas
                             sales contract is dedicated to loan service under
                             certain circumstances. Prepayment of the loan may
                             be required under certain situations, including
                             events impairing the security interest.
                       /(g/) Required payments of long-term debt for the years
                             2002-2005 are $209 million, $207 million, $710
                             million and $440 million, respectively.
                       /(h)/ In the event of a change in control of USX, as
                             defined in the related agreements, debt obligations
                             totaling $3,614 million may be declared immediately
                             due and payable. The principal obligations subject
                             to such a provision are Notes payable - $2,505
                             million; USSK loan facility - $325 million; and
                             Guaranteed Loan - $199 million. In such event, USX
                             may also be required to either repurchase the
                             leased Fairfield slab caster for $100 million or
                             provide a letter of credit to secure the remaining
                             obligation.

U-20


--------------------------------------------------------------------------------
15. Inventories



                        (In millions)                                                 December 31             2000         1999
                        --------------------------------------------------------------------------------------------------------
                                                                                                              
                        Raw materials                                                                      $    915    $     830
                        Semi-finished products                                                                  429          392
                        Finished products                                                                     1,279        1,239
                        Supplies and sundry items                                                               190          166
                                                                                                           --------    ---------
                               Total (at cost)                                                                2,813        2,627
                        Less inventory market valuation reserve                                                   -            -
                                                                                                           --------    ---------
                               Net inventory carrying value                                                $  2,813    $   2,627
                        --------------------------------------------------------------------------------------------------------


                             At December 31, 2000 and 1999, the LIFO method
                        accounted for 92% and 91%, respectively, of total
                        inventory value. Current acquisition costs were
                        estimated to exceed the above inventory values at
                        December 31 by approximately $880 million and $570
                        million in 2000 and 1999, respectively. Cost of revenues
                        was reduced and income from operations was increased by
                        $17 million in 2000 as a result of liquidations of LIFO
                        inventories.
                             The inventory market valuation reserve reflects the
                        extent that the recorded LIFO cost basis of crude oil
                        and refined products inventories exceeds net realizable
                        value. The reserve is decreased to reflect increases in
                        market prices and inventory turnover and increased to
                        reflect decreases in market prices. Changes in the
                        inventory market valuation reserve result in noncash
                        charges or credits to costs and expenses. During 2000,
                        there were no charges or credits to costs and expenses.

--------------------------------------------------------------------------------
16. Supplemental Cash Flow Information



                        (In millions)                                                            2000         1999         1998
                        ----------------------------------------------------------------------------------------------------------
                                                                                                             
                        Cash used in operating activities included:
                         Interest and other financial costs paid
                           (net of amount capitalized)                                     $      (341)   $    (366)   $    (336)
                         Income taxes paid                                                        (387)         (98)        (183)
                        ---------------------------------------------------------------------------------------------------------
                        Commercial paper and revolving credit arrangements - net:
                         Commercial paper    - issued                                      $     3,362    $   6,282    $       -
                                             - repayments                                       (3,450)      (6,117)           -
                         Credit agreements - borrowings                                            437        5,529       17,486
                                             - repayments                                         (437)      (5,980)     (16,817)
                         Other credit arrangements - net                                           150          (95)          55
                                                                                           ------------   ----------   ----------
                              Total                                                        $        62    $    (381)   $     724
                       ----------------------------------------------------------------------------------------------------------
                        Noncash investing and financing activities:
                         Common stock issued for dividend reinvestment and
                           employee stock plans                                            $        15    $       6    $       5
                         Marathon Stock issued for Exchangeable Shares                               -            7           11
                         Investee preferred stock received in conversion of investee loan            -          142            -
                         Disposal of assets:
                           Exchange of Sakhalin Energy investment                                  410            -            -
                           Deposit of RTI common shares in satisfaction of indexed debt              -           56            -
                           Interest in USS/Kobe contributed to Republic                              -           40            -
                           Other - notes or common stock received                                   20           20            2
                         Business combinations:
                           Acquisition of USSK:
                            Liabilities assumed                                                    568            -            -
                            Contingent consideration payable at present value                       21            -            -
                            Investee liabilities consolidated in step acquisition                    3            -            -
                           Acquisition of Tarragon:
                            Exchangeable Shares issued                                               -            -           29
                            Liabilities assumed                                                      -            -          433
                           Acquisition of Ashland RM&T net assets:
                            38% interest in MAP                                                      -            -        1,900
                            Liabilities assumed                                                      -            -        1,038
                           Other acquisitions:
                            Liabilities assumed                                                      -           42            -
                            Investee liabilities consolidated in step acquisition                    -           26            -
                       ----------------------------------------------------------------------------------------------------------


                                                                            U-21


--------------------------------------------------------------------------------
17. Stock-Based Compensation Plans

                        The 1990 Stock Plan, as amended and restated, authorizes
                        the Compensation Committee of the Board of Directors to
                        grant restricted stock, stock options and stock
                        appreciation rights to key management employees. Such
                        employees are generally granted awards of the class of
                        common stock intended to reflect the performance of the
                        group(s) to which their work relates. Up to .5 percent
                        of the outstanding Marathon Stock and .8 percent of the
                        outstanding Steel Stock, as determined on December 31 of
                        the preceding year, are available for grants during each
                        calendar year the 1990 Plan is in effect. In addition,
                        awarded shares that do not result in shares being issued
                        are available for subsequent grant, and any ungranted
                        shares from prior years' annual allocations are
                        available for subsequent grant during the years the 1990
                        Plan is in effect. As of December 31, 2000, 8,519,302
                        Marathon Stock shares and 2,108,128 Steel Stock shares
                        were available for grants in 2001.
                             Restricted stock represents stock granted for such
                        consideration, if any, as determined by the Compensation
                        Committee, subject to provisions for forfeiture and
                        restricting transfer. Those restrictions may be removed
                        as conditions such as performance, continuous service
                        and other criteria are met. Restricted stock is issued
                        at the market price per share at the date of grant and
                        vests over service periods that range from one to five
                        years.
                             Deferred compensation is charged to stockholders'
                        equity when the restricted stock is granted and
                        subsequently adjusted for changes in the market value of
                        the underlying stock. The deferred compensation is
                        expensed over the balance of the vesting period and
                        adjusted if conditions of the restricted stock grant are
                        not met.
                             The following table presents information on
                        restricted stock grants:



                                                                       Marathon Stock                         Steel Stock
                                                              -------------------------------     -------------------------------
                                                                2000       1999        1998         2000         1999      1998
                        ----------------------------------------------------------------------------------------------------------
                                                                                                       
                        Number of shares granted             410,025      28,798      25,378      305,725      18,272     17,742
                        Weighted-average grant-date
                          fair value per share               $ 25.50     $ 29.38     $ 34.00      $ 23.00     $ 28.22    $ 37.28
                        ----------------------------------------------------------------------------------------------------------


                             Stock options represent the right to purchase
                        shares of Marathon Stock or Steel Stock at the market
                        value of the stock at date of grant. Certain options
                        contain the right to receive cash and/or common stock
                        equal to the excess of the fair market value of shares
                        of common stock, as determined in accordance with the
                        plan, over the option price of shares. Most stock
                        options vest after a one-year service period and all
                        expire 10 years from the date they are granted.
                             The following is a summary of stock option
                        activity:



                                                                           Marathon Stock                        Steel Stock
                                                                       ------------------------           ------------------------
                                                                       Shares        Price/(a)/           Shares        Price/(a)/
                        ----------------------------------------------------------------------------------------------------------
                                                                                                            
                        Balance December 31, 1997                     3,694,865      $  24.81            1,633,100      $  34.35
                        Granted                                         987,535         34.00              611,515         37.28
                        Exercised                                      (594,260)        27.61             (230,805)        32.00
                        Canceled                                        (13,200)        27.22              (21,240)        35.89
                                                                      ----------                         ----------
                        Balance December 31, 1998                     4,074,940         26.62            1,992,570         35.50
                        Granted                                       1,005,000         29.38              656,400         28.22
                        Exercised                                      (176,160)        27.27               (2,580)        24.92
                        Canceled                                       (121,055)        30.19              (20,005)        38.51
                                                                      ----------                         ----------
                        Balance December 31, 1999                     4,782,725         27.08            2,626,385         33.67
                        Granted                                       1,799,880         25.18              915,470         23.00
                        Exercised                                       (58,870)        23.11                 (400)        24.30
                        Canceled                                       (410,115)        28.06              (62,955)        38.19
                                                                      ----------                         ----------
                        Balance December 31, 2000                     6,113,620         26.50            3,478,500         30.78
                        ----------------------------------------------------------------------------------------------------------


                        /(a)/ Weighted-average exercise price

                            The weighted-average grant-date fair value per
                        option for the Marathon Stock was $7.51 in 2000, $8.89
                        in 1999 and $10.43 in 1998. For the Steel Stock such
                        amounts were $6.63 in 2000, $6.95 in 1999 and $8.29 in
                        1998.
                             The following table represents stock options at
                        December 31, 2000:



                                                                           Outstanding                         Exercisable
                                                           ----------------------------------------      -------------------------
                                                                            Weighted-
                                                              Number         Average      Weighted-        Number      Weighted-
                                           Range of          of Shares      Remaining      Average        of Shares     Average
                                           Exercise            Under       Contractual    Exercise          Under      Exercise
                                            Prices            Option          Life          Price          Option        Price
                        ----------------------------------------------------------------------------------------------------------
                                                                                                     
                        Marathon Stock   $ 17.00-23.44      1,947,290      4.5 years      $  21.03        1,647,290    $ 20.60
                                           25.38-26.47      1,512,905      8.6               25.53          135,225      25.38
                                           29.38-34.00      2,653,425      7.5               31.06        2,653,425      31.06
                                                           ----------                                    ----------
                                             Total          6,113,620                                     4,435,940
                                                           ----------                                    ----------
                        Steel Stock      $ 23.00-28.22      1,592,305      8.8 years      $  25.17          678,135    $ 28.10
                                           31.69-34.44      1,050,920      5.2               32.53        1,050,920      32.53
                                           37.28-44.19        835,275      6.0               39.26          835,275      39.26
                                                           ----------                                    ----------
                                             Total          3,478,500                                     2,564,330
                        ----------------------------------------------------------------------------------------------------------


U-22


                         Actual stock-based compensation expense (credit) was $6
                    million in 2000 and $(3) million in 1999 and 1998.
                    Incremental compensation expense, as determined under a fair
                    value model, was not material ($.02 or less per share for
                    all years presented). Therefore, pro forma net income and
                    earnings per share data have been omitted.
                         USX has a deferred compensation plan for non-employee
                    directors of its Board of Directors. The plan permits
                    participants to defer some or all of their annual retainers
                    in the form of common stock units or cash and it requires
                    new directors to defer at least half of their annual
                    retainer in the form of common stock units. Common stock
                    units are book entry units equal in value to a share of
                    Marathon Stock or Steel Stock. Deferred stock benefits are
                    distributed in shares of common stock within five business
                    days after a participant leaves the Board of Directors.
                    During 2000, 14,242 shares of Marathon Stock and 4,872
                    shares of Steel Stock were issued and during 1999, 10,541
                    shares of Marathon Stock and 3,798 shares of Steel Stock
                    were issued. During 1998, no shares of common stock were
                    issued.

--------------------------------------------------------------------------------
18. Dividends

                    In accordance with the USX Certificate, dividends on the
                    Marathon Stock and Steel Stock are limited to the legally
                    available funds of USX. Net losses of any Group, as well as
                    dividends and distributions on any class of USX Common Stock
                    or series of preferred stock and repurchases of any class of
                    USX Common Stock or series of preferred stock at prices in
                    excess of par or stated value, will reduce the funds of USX
                    legally available for payment of dividends on all classes of
                    Common Stock. Subject to this limitation, the Board of
                    Directors intends to declare and pay dividends on the
                    Marathon Stock and Steel Stock based on the financial
                    condition and results of operations of the related group,
                    although it has no obligation under Delaware law to do so.
                    In making its dividend decisions with respect to each of the
                    Marathon Stock and Steel Stock, the Board of Directors
                    considers, among other things, the long-term earnings and
                    cash flow capabilities of the related group as well as the
                    dividend policies of similar publicly traded companies.
                         Dividends on the Steel Stock are further limited to the
                    Available Steel Dividend Amount. At December 31, 2000, the
                    Available Steel Dividend Amount was at least $3,161 million.
                    The Available Steel Dividend Amount will be increased or
                    decreased, as appropriate, to reflect U. S. Steel Group net
                    income, dividends, repurchases or issuances with respect to
                    the Steel Stock and preferred stock attributed to the U. S.
                    Steel Group and certain other items.

--------------------------------------------------------------------------------
19. Stockholder Rights Plan

                    On September 28, 1999, USX's Board of Directors adopted a
                    new Stockholder Rights Plan and declared a dividend
                    distribution of one right for each outstanding share of
                    Marathon Stock and Steel Stock (referred to together as
                    "Voting Stock") to stockholders of record on October 9,
                    1999. Each right becomes exercisable, at a price of $110,
                    after any person or group has acquired, obtained the right
                    to acquire or made a tender or exchange offer for 15% or
                    more of the outstanding voting power represented by the
                    outstanding Voting Stock, except pursuant to a qualifying
                    all-cash tender offer for all outstanding shares of Voting
                    Stock which results in the offeror owning shares of Voting
                    Stock representing a majority of the voting power (other
                    than Voting Stock beneficially owned by the offeror
                    immediately prior to the offer). Each right entitles the
                    holder, other than the acquiring person or group, to
                    purchase one one-hundredth of a share of Series A Junior
                    Preferred Stock or, upon the acquisition by any person of
                    15% or more of the outstanding voting power represented by
                    the outstanding Voting Stock, Marathon Stock or Steel Stock
                    (or, in certain circumstances, other property) having a
                    market value of twice the exercise price. After a person or
                    group acquires 15% or more of the outstanding voting power,
                    if USX engages in a merger or other business combination
                    where it is not the surviving corporation or where it is the
                    surviving corporation and the Voting Stock is changed or
                    exchanged, or if 50% or more of USX's assets, earnings power
                    or cash flow are sold or transferred, each right entitles
                    the holder to purchase common stock of the acquiring entity
                    having a market value of twice the exercise price. The
                    rights and the exercise price are subject to adjustment. The
                    rights will expire on October 9, 2009, unless such date is
                    extended or the rights are earlier redeemed by USX for one
                    cent per right at any time prior to the point they become
                    exercisable. Under certain circumstances, the Board of
                    Directors has the option to exchange one share of the
                    respective class of Voting Stock for each exercisable right.

                                                                            U-23


--------------------------------------------------------------------------------
20. Income Per Common Share

                    The method of calculating net income (loss) per share for
                    the Marathon Stock and the Steel Stock reflects the USX
                    Board of Directors' intent that the separately reported
                    earnings and surplus of the Marathon Group and the U. S.
                    Steel Group, as determined consistent with the USX
                    Certificate, are available for payment of dividends on the
                    respective classes of stock, although legally available
                    funds and liquidation preferences of these classes of stock
                    do not necessarily correspond with these amounts. The
                    financial statements of the Marathon Group and the U. S.
                    Steel Group, taken together, include all accounts which
                    comprise the corresponding consolidated financial statements
                    of USX.
                         Basic net income (loss) per share is calculated by
                    adjusting net income for dividend requirements of preferred
                    stock and is based on the weighted average number of common
                    shares outstanding.
                         Diluted net income (loss) per share assumes conversion
                    of convertible securities for the applicable periods
                    outstanding and assumes exercise of stock options, provided
                    in each case, the effect is not antidilutive.



                                                  COMPUTATION OF INCOME PER SHARE

                                                                       2000                   1999                   1998
                                                                ------------------      ------------------     ------------------
                                                                Basic      Diluted      Basic     Diluted      Basic      Diluted
             --------------------------------------------------------------------------------------------------------------------
                                                                                                     
              Marathon Group
              --------------
              Net income (millions)                           $    432   $    432    $    654    $    654    $    310   $    310
                                                              ========   ========    ========    ========    ========   ========
              Shares of common stock outstanding (thousands):
               Average number of common shares outstanding     311,531    311,531     309,696     309,696     292,876    292,876
               Effect of dilutive securities -
                 Stock options                                       -        230           -         314           -        559
                                                              --------   --------    --------    --------    --------   --------
                    Average common shares and dilutive effect  311,531    311,761     309,696     310,010     292,876    293,435
                                                              ========   ========    ========    ========    ========   ========
              Net income per share                            $   1.39   $   1.39    $   2.11    $   2.11    $   1.06   $   1.05
              -------------------------------------------------------------------------------------------------------------------
              U. S. Steel Group
              -----------------
              Net income (loss) (millions):
               Income (loss) before extraordinary losses      $    (21)  $    (21)   $     51    $     51    $    364   $    364
               Dividends on preferred stock                          8          8           9           9           9          -
               Extraordinary losses                                  -          -           7           7           -          -
                                                              --------   --------    --------    --------    --------   --------
               Net income (loss) applicable to Steel Stock         (29)       (29)         35          35         355        364
               Effect of dilutive securities -
                 Trust preferred securities                          -          -           -           -           -          8
                                                              --------   --------    --------    --------    --------   --------
                    Net income (loss) assuming conversions    $    (29)  $    (29)   $     35    $     35    $    355   $    372
                                                              ========   ========    ========    ========    ========   ========
              Shares of common stock outstanding (thousands):
               Average number of common shares outstanding      88,613     88,613      88,392      88,392      87,508     87,508
               Effect of dilutive securities:
                 Trust preferred securities                          -          -           -           -           -      4,256
                 Preferred stock                                     -          -           -           -           -      3,143
                 Stock options                                       -          -           -           4           -         36
                                                              --------   --------    --------    --------    --------   --------
                    Average common shares and dilutive effect   88,613     88,613      88,392      88,396      87,508     94,943
                                                              ========   ========    ========    ========    ========   ========
              Per share:
               Income (loss) before extraordinary losses      $   (.33)  $   (.33)   $    .48    $    .48    $   4.05   $   3.92
               Extraordinary losses                                  -          -         .08         .08           -          -
                                                              --------   --------    --------    --------    --------   --------
               Net income (loss)                              $   (.33)  $   (.33)   $    .40    $    .40    $   4.05   $   3.92
             -------------------------------------------------------------------------------------------------------------------


U-24


--------------------------------------------------------------------------------
21. Property, Plant and Equipment



                    (In millions)                                                 December 31             2000         1999
                    -----------------------------------------------------------------------------------------------------------
                                                                                                            
                    Marathon Group:
                    Production                                                                         $  12,266    $  14,568
                    Refining                                                                               2,800        2,439
                    Marketing                                                                              2,286        2,197
                    Transportation                                                                         1,402        1,374
                    Other                                                                                    312          282
                                                                                                       ---------    ---------
                           Total                                                                          19,066       20,860
                                                                                                       ---------    ---------
                    U. S. Steel Group:
                    Land and depletable property                                                             161          152
                    Buildings                                                                                602          484
                    Machinery and equipment                                                                8,409        8,007
                    Leased assets                                                                             98          105
                                                                                                       ---------    ---------
                           Total                                                                           9,270        8,748
                                                                                                       ---------    ---------
                    USX Corporation:
                    Total property, plant and equipment                                                   28,336       29,608
                    Less accumulated depreciation, depletion and amortization:
                           Marathon Group                                                                  9,691       10,567
                           U. S. Steel Group                                                               6,531        6,232
                                                                                                       ---------    ---------
                    Net property, plant and equipment                                                  $  12,114    $  12,809
                    -----------------------------------------------------------------------------------------------------------

                         Property, plant and equipment includes gross assets
                    acquired under capital leases (including sale-leasebacks
                    accounted for as financings) of $106 million at December 31,
                    2000, and $125 million at December 31, 1999; related amounts
                    in accumulated depreciation, depletion and amortization were
                    $79 million and $81 million, respectively.
                         During 2000, the U. S. Steel Group recorded $71 million
                    of impairments relating to coal assets located in West
                    Virginia and Alabama. The impairment was recorded as a
                    result of a reassessment of long-term prospects after
                    adverse geological conditions were encountered.
                         During 2000, the Marathon Group recorded $193 million
                    of impairments of certain E&P segment oil and gas
                    properties, primarily located in Canada. The impairments
                    were recorded due to reserve revisions as a result of
                    production performance and disappointing drilling results.
                    The fair value of the properties was determined using a
                    discounted cash flow model, unless an indicative offer to
                    purchase was available. The Marathon Group used pricing
                    assumptions based on forecasted prices applicable for the
                    remaining life of the assets derived from current market
                    conditions and long-term forecasts. The discounted cash flow
                    calculation included risk-adjusted probable and possible
                    reserve quantities.
                         In 1998, the Marathon Group recorded a $60 million
                    impairment charge on its oil and gas properties in Libya.
                    The deterioration of U.S. relations with Libya at the time
                    created an unstable environment that caused the Marathon
                    Group to reevaluate its stance with its investment in Libya.
                    The Marathon Group impaired the value of these assets
                    because it could not reasonably predict with a high degree
                    of certainty if government sanctions which prevented the
                    Marathon Group from operating these assets would ever be
                    lifted.
                         All impairment charges were included in depreciation,
                    depletion and amortization.

                                                                            U-25


--------------------------------------------------------------------------------
22. Preferred Stock of Subsidiary and Trust Preferred Securities

                    USX Capital LLC, a wholly owned subsidiary of USX, sold
                    10,000,000 shares (carrying value of $250 million) of 8 3/4%
                    Cumulative Monthly Income Preferred Shares (MIPS)
                    (liquidation preference of $25 per share) in 1994. Proceeds
                    of the issue were loaned to USX. USX has the right under the
                    loan agreement to extend interest payment periods for up to
                    18 months, and as a consequence, monthly dividend payments
                    on the MIPS can be deferred by USX Capital LLC during any
                    such interest payment period. In the event that USX
                    exercises this right, USX may not declare dividends on any
                    share of its preferred or common stocks. The MIPS are
                    redeemable at the option of USX Capital LLC and subject to
                    the prior consent of USX, in whole or in part from time to
                    time, for $25 per share, and will be redeemed from the
                    proceeds of any repayment of the loan by USX. In addition,
                    upon final maturity of the loan, USX Capital LLC is required
                    to redeem the MIPS. The financial costs are included in net
                    interest and other financial costs.
                         In 1997, USX exchanged approximately 3.9 million 6.75%
                    Convertible Quarterly Income Preferred Securities (Trust
                    Preferred Securities) of USX Capital Trust I, a Delaware
                    statutory business trust (Trust), for an equivalent number
                    of shares of its 6.50% Cumulative Convertible Preferred
                    Stock (6.50% Preferred Stock) (Exchange). The Exchange
                    resulted in the recording of Trust Preferred Securities at a
                    fair value of $182 million.
                         USX owns all of the common securities of the Trust,
                    which was formed for the purpose of the Exchange. (The Trust
                    Common Securities and the Trust Preferred Securities are
                    together referred to as the Trust Securities.) The Trust
                    Securities represent undivided beneficial ownership
                    interests in the assets of the Trust, which consist solely
                    of USX 6.75% Convertible Junior Subordinated Debentures
                    maturing March 31, 2037 (Debentures), having an aggregate
                    principal amount equal to the aggregate initial liquidation
                    amount ($50.00 per security and $203 million in total) of
                    the Trust Securities issued by the Trust. Interest and
                    principal payments on the Debentures will be used to make
                    quarterly distributions and to pay redemption and
                    liquidation amounts on the Trust Preferred Securities. The
                    quarterly distributions, which accumulate at the rate of
                    6.75% per annum on the Trust Preferred Securities and the
                    accretion from fair value to the initial liquidation amount,
                    are charged to income and included in net interest and other
                    financial costs.
                         Under the terms of the Debentures, USX has the right to
                    defer payment of interest for up to 20 consecutive quarters
                    and, as a consequence, monthly distributions on the Trust
                    Preferred Securities will be deferred during such period. If
                    USX exercises this right, then, subject to limited
                    exceptions, it may not pay any dividend or make any
                    distribution with respect to any shares of its capital
                    stock.
                         The Trust Preferred Securities are convertible at any
                    time prior to the close of business on March 31, 2037
                    (unless such right is terminated earlier under certain
                    circumstances) at the option of the holder, into shares of
                    Steel Stock at a conversion price of $46.25 per share of
                    Steel Stock (equivalent to a conversion ratio of 1.081
                    shares of Steel Stock for each Trust Preferred Security),
                    subject to adjustment in certain circumstances.
                         The Trust Preferred Securities may be redeemed at any
                    time at the option of USX, at a premium of 101.95% of the
                    initial liquidation amount through March 31, 2001, and
                    thereafter, declining annually to the initial liquidation
                    amount on April 1, 2003, and thereafter. They are
                    mandatorily redeemable at March 31, 2037, or earlier under
                    certain circumstances.
                         Payments related to quarterly distributions and to the
                    payment of redemption and liquidation amounts on the Trust
                    Preferred Securities by the Trust are guaranteed by USX on a
                    subordinated basis. In addition, USX unconditionally
                    guarantees the Trust's Debentures. The obligations of USX
                    under the Debentures, and the related indenture, trust
                    agreement and guarantee constitute a full and unconditional
                    guarantee by USX of the Trust's obligations under the Trust
                    Preferred Securities.

--------------------------------------------------------------------------------
23. Preferred Stock

                    USX is authorized to issue 40,000,000 shares of preferred
                    stock, without par value -

                    6.50% Cumulative Convertible Preferred Stock (6.50%
                    Preferred Stock) - As of December 31, 2000, 2,413,487 shares
                    (stated value of $1.00 per share; liquidation preference of
                    $50.00 per share) were outstanding. The 6.50% Preferred
                    Stock is convertible at any time, at the option of the
                    holder, into shares of Steel Stock at a conversion price of
                    $46.125 per share of Steel Stock, subject to adjustment in
                    certain circumstances. This stock is redeemable at USX's
                    sole option, at a price of $50.975 per share beginning April
                    1, 2000, and thereafter at prices declining annually on each
                    April 1 to an amount equal to $50.00 per share on and after
                    April 1, 2003.

U-26


--------------------------------------------------------------------------------
24. Derivative Instruments

USX remains at risk for possible changes in the market value of derivative
instruments; however, such risk should be mitigated by price changes in the
underlying hedged item. USX is also exposed to credit risk in the event of
nonperformance by counterparties. The credit-worthiness of counterparties is
subject to continuing review, including the use of master netting agreements to
the extent practical, and full performance is anticipated.
     The following table sets forth quantitative information by class of
derivative instrument for derivative instruments categorized as trading or other
than trading:



                                                                                         Recognized
                                                   Fair                 Carrying           Trading       Recorded
                                                   Value                 Amount            Gain or       Deferred     Aggregate
                                                  Assets                 Assets          (Loss) for       Gain or     Contract
(In millions)                                  (Liabilities)/(a)//(b)/(Liabilities)       the Year        (Loss)       Values/(c)/
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                       
December 31, 2000:
  Exchange-traded commodity futures:
   Trading                                       $      -              $      -         $    (19)      $      -       $      -
   Other than trading                                   -                     -                -              7            897
  Exchange-traded commodity options:
   Trading                                              -                     -                -              -              -
   Other than trading                                  (6)/(d)/              (6)               -             (1)           971
  OTC commodity swaps/(e)/:
   Trading                                              -                     -                -              -              -
   Other than trading                                  35/(f)/               35                -             25            426
  OTC commodity options:
   Trading                                              -                     -                -              -              -
   Other than trading                                 (52)/(g)/             (52)               -            (40)            94
                                                  --------              --------         --------       --------       --------
      Total commodities                          $    (23)             $    (23)        $    (19)      $     (9)      $  2,388
                                                  ========              ========         ========       ========       ========
  Forward exchange contracts/(h)/:
      - receivable                               $     14              $     14         $      -       $      -       $     14
---------------------------------------------------------------------------------------------------------------------------------
December 31, 1999:
  Exchange-traded commodity futures:
   Trading                                       $      -              $      -         $      4       $      -       $      8
   Other than trading                                   -                     -                -             28            344
  Exchange-traded commodity options:
   Trading                                              -                     -                4              -            179
   Other than trading                                  (6)/(d)/              (6)               -            (10)         1,262
  OTC commodity swaps:
   Trading                                              -                     -                -              -              -
   Other than trading                                   6/(f)/                6                -              5            193
  OTC commodity options:
   Trading                                              -                     -                -              -              -
   Other than trading                                   4/(g)/                4                -              5            238
                                                  --------              --------         --------       --------       --------
      Total commodities                          $      4              $      4         $      8       $     28       $  2,224
                                                  ========              ========         ========       ========       ========
  Forward exchange contracts:
      - receivable                               $     52              $     52         $      -       $      -       $     51
---------------------------------------------------------------------------------------------------------------------------------


/(a)/ The fair value amounts for OTC positions are based on various indices or
      dealer quotes. The fair value amounts for currency contracts are based on
      dealer quotes of forward prices covering the remaining duration of the
      forward exchange contract. The exchange-traded futures contracts and
      certain option contracts do not have a corresponding fair value since
      changes in the market prices are settled on a daily basis.
/(b)/ The aggregate average fair value of all trading activities for 2000 and
      1999 was $(5) million and $3 million, respectively. Detail by class of
      instrument was not available.
/(c)/ Contract or notional amounts do not quantify risk exposure, but are used
      in the calculation of cash settlements under the contracts. The contract
      or notional amounts do not reflect the extent to which positions may
      offset one another.
/(d)/ Includes fair values as of December 31, 2000 and 1999, for assets of
      $10 million and $11 million and for liabilities of $(16) million and $(17)
      million, respectively.
/(e)/ The OTC swap arrangements vary in duration with certain contracts
      extending into 2008.
/(f)/ Includes fair values as of December 31, 2000 and 1999, for assets of $84
      million and $11 million and for liabilities of $(49) million and $(5)
      million, respectively.
/(g)/ Includes fair values as of December 31, 2000 and 1999, for assets of $1
      million and $5 million and for liabilities of $(53) million and $(1)
      million, respectively.
/(h)/ The forward exchange contracts relating to USX's foreign operations have
      various maturities ending in March 2001.

                                                                            U-27


--------------------------------------------------------------------------------
25. Fair Value of Financial Instruments

                        Fair value of the financial instruments disclosed herein
                        is not necessarily representative of the amount that
                        could be realized or settled, nor does the fair value
                        amount consider the tax consequences of realization or
                        settlement. The following table summarizes financial
                        instruments, excluding derivative financial instruments
                        disclosed in Note 24, by individual balance sheet
                        account:



                                                                                              2000                   1999
                                                                                     ---------------------------------------------
                                                                                        Fair     Carrying      Fair      Carrying
                        (In millions)                    December 31                    Value     Amount       Value      Amount
                       -----------------------------------------------------------------------------------------------------------
                                                                                                            
                        Financial assets:
                         Cash and cash equivalents                                   $    559    $    559    $    133   $    133
                         Receivables                                                    3,238       3,238       2,717      2,717
                         Investments and long-term receivables                            211         147         190        134
                                                                                      --------    --------    --------   --------
                            Total financial assets                                   $  4,008    $  3,944    $  3,040   $  2,984
                       -----------------------------------------------------------------------------------------------------------
                        Financial liabilities:
                         Notes payable                                               $    150    $    150    $      -   $      -
                         Accounts payable                                               3,774       3,774       3,409      3,409
                         Accrued interest                                                 108         108         107        107
                         Long-term debt (including amounts due within one year)         4,549       4,365       4,278      4,176
                         Preferred stock of subsidiary and trust
                           preferred securities                                           357         433         408        433
                                                                                      --------    --------    --------    --------
                            Total financial liabilities                              $  8,938    $  8,830    $  8,202   $  8,125
                       -----------------------------------------------------------------------------------------------------------


                             Fair value of financial instruments classified as
                        current assets or liabilities approximates carrying
                        value due to the short-term maturity of the instruments.
                        Fair value of investments and long-term receivables was
                        based on discounted cash flows or other specific
                        instrument analysis. Certain foreign cost method
                        investments are excluded from investments and long-term
                        receivables because the fair value is not readily
                        determinable. USX is subject to market risk and
                        liquidity risk related to its investments; however,
                        these risks are not readily quantifiable. Fair value of
                        preferred stock of subsidiary and trust preferred
                        securities was based on market prices. Fair value of
                        long-term debt instruments was based on market prices
                        where available or current borrowing rates available for
                        financings with similar terms and maturities.
                             USX's only unrecognized financial instruments are
                        financial guarantees and commitments to extend credit.
                        It is not practicable to estimate the fair value of
                        these forms of financial instrument obligations because
                        there are no quoted market prices for transactions which
                        are similar in nature. For details relating to financial
                        guarantees, see Note 26.

--------------------------------------------------------------------------------
26. Contingencies and Commitments

                        USX is the subject of, or party to, a number of pending
                        or threatened legal actions, contingencies and
                        commitments involving a variety of matters, including
                        laws and regulations relating to the environment.
                        Certain of these matters are discussed below. The
                        ultimate resolution of these contingencies could,
                        individually or in the aggregate, be material to the
                        consolidated financial statements. However, management
                        believes that USX will remain a viable and competitive
                        enterprise even though it is possible that these
                        contingencies could be resolved unfavorably.

                        Environmental matters -
                             USX is subject to federal, state, local and foreign
                        laws and regulations relating to the environment. These
                        laws generally provide for control of pollutants
                        released into the environment and require responsible
                        parties to undertake remediation of hazardous waste
                        disposal sites. Penalties may be imposed for
                        noncompliance. At December 31, 2000 and 1999, accrued
                        liabilities for remediation totaled $212 million and
                        $170 million, respectively. It is not presently possible
                        to estimate the ultimate amount of all remediation costs
                        that might be incurred or the penalties that may be
                        imposed. Receivables for recoverable costs from certain
                        states, under programs to assist companies in cleanup
                        efforts related to underground storage tanks at retail
                        marketing outlets, were $57 million at December 31,
                        2000, and $52 million at December 31, 1999.
                             For a number of years, USX has made substantial
                        capital expenditures to bring existing facilities into
                        compliance with various laws relating to the
                        environment. In 2000 and 1999, such capital expenditures
                        totaled $91 million and $78 million, respectively. USX
                        anticipates making additional such expenditures in the
                        future; however, the exact amounts and timing of such
                        expenditures are uncertain because of the continuing
                        evolution of specific regulatory requirements.
                             At December 31, 2000 and 1999, accrued liabilities
                        for platform abandonment and dismantlement totaled $162
                        million and $152 million, respectively.

U-28


                        Guarantees -
                             Guarantees of the liabilities of unconsolidated
                        entities by USX and its consolidated subsidiaries
                        totaled $82 million at December 31, 2000, and $219
                        million at December 31, 1999. In the event that any
                        defaults of guaranteed liabilities occur, USX has access
                        to its interest in the assets of most of the investees
                        to reduce potential losses resulting from these
                        guarantees. As of December 31, 2000, the largest
                        guarantee for a single such entity was $59 million.
                             At December 31, 2000 and 1999, USX's pro rata share
                        of obligations of LOOP LLC and various pipeline
                        investees secured by throughput and deficiency
                        agreements totaled $119 million and $146 million,
                        respectively. Under the agreements, USX is required to
                        advance funds if the investees are unable to service
                        debt. Any such advances are prepayments of future
                        transportation charges.

                        Commitments -
                             At December 31, 2000 and 1999, contract commitments
                        to acquire property, plant and equipment and long-term
                        investments totaled $663 million and $568 million,
                        respectively.
                             USSK has a commitment to the Slovak government for
                        a capital improvements program of $700 million, subject
                        to certain conditions, over a period commencing with the
                        acquisition date and ending on December 31, 2010. USSK
                        is required to report periodically to the Slovak
                        government on its status toward meeting this commitment.
                        The first reporting period ends on December 31, 2003.
                             USX entered into a 15-year take-or-pay arrangement
                        in 1993, which requires USX to accept pulverized coal
                        each month or pay a minimum monthly charge of
                        approximately $1 million. Charges for deliveries of
                        pulverized coal totaled $23 million in 2000, 1999 and
                        1998. If USX elects to terminate the contract early, a
                        maximum termination payment of $96 million, which
                        declines over the duration of the agreement, may be
                        required.
                             USX is a party to a 15-year transportation services
                        agreement with a natural gas transmission company. The
                        contract requires USX to pay minimum annual demand
                        charges of approximately $5 million starting in December
                        2000 and concluding in 2015. The payments are required
                        even if the transportation facility is not utilized.
                        Demand charges paid in 2000 were less than $1 million.

--------------------------------------------------------------------------------
27. Joint Venture Formation

                        In December 2000, Marathon and Kinder Morgan Energy
                        Partners, L.P. signed a definitive agreement to form a
                        joint venture combining certain of their oil and gas
                        producing activities in the U.S. Permian Basin,
                        including Marathon's interest in the Yates Field. This
                        transaction will allow Marathon to expand its interests
                        in the Permian Basin and will improve access to
                        materials for use in enhanced recovery techniques in the
                        Yates Field. The joint venture named MKM Partners L.P.,
                        commenced operations in January 2001 and will be
                        accounted for under the equity method of accounting.
                             As a result of the agreement to form this joint
                        venture, Marathon recognized a pretax charge of $931
                        million in the fourth quarter 2000, which is included in
                        net gains (losses) on disposal of assets, and
                        reclassified the remaining book value associated with
                        the Yates Field from property, plant and equipment to
                        assets held for sale. Upon completion of this
                        transaction in January 2001, the book value will be
                        transferred from assets held for sale to investments and
                        long-term receivables.

--------------------------------------------------------------------------------
28. Subsequent Event - Business Combination

                        On February 7, 2001, Marathon acquired 87% of the
                        outstanding common stock of Pennaco Energy Inc., a
                        natural gas producer. Marathon plans to acquire the
                        remaining Pennaco shares through a merger in which each
                        share of Pennaco common stock, not purchased in the
                        offer and not held by stockholders who have properly
                        exercised dissenters rights under Delaware law, will be
                        converted into the right to receive the tender offer
                        price in cash, without interest. The purchase price is
                        expected to approximate $500 million. The acquisition
                        will be accounted for using the purchase method of
                        accounting.

                                                                            U-29


Selected Quarterly Financial Data (Unaudited)



                                                    2000                                              1999
                               -----------------------------------------------    -----------------------------------------------
(In millions, except per share
data)                          4th Qtr.    3rd Qtr.     2nd Qtr.    1st Qtr.     4th Qtr.     3rd Qtr.    2nd Qtr.     1st Qtr.
---------------------------------------------------------------------------------------------------------------------------------
                                                                                               
Revenues and other income:
  Revenues(a)                  $10,293     $10,607      $10,293      $ 9,307       $8,725      $ 7,713     $ 6,649     $ 5,981
  Other income (loss)             (837)         72           57          122           53          (13)         35         (24)
                               -------     -------      -------      -------       -------     -------     -------     -------
      Total                      9,456      10,679       10,350        9,429        8,778        7,700       6,684       5,957
Income (loss) from operations     (625)        789          972          616          425          535         502         401
  Includes:
    Joint venture
      formation charges           (931)          -            -            -            -            -           -           -
    Inventory market
      valuation credits              -           -            -            -            -          136          66         349
Income (loss) before
  extraordinary losses            (449)        140          423          297          205          201         189         110
Net income (loss)                 (449)        140          423          297          205          199         189         105
---------------------------------------------------------------------------------------------------------------------------------
Marathon Stock data:
--------------------
Net income (loss)              $  (310)    $   121      $   367      $   254       $  171      $   230     $   134     $   119
  Per share - basic and diluted  (1.00)        .38         1.18          .81          .55          .74         .43         .38
Dividends paid per share           .23         .23          .21          .21          .21          .21         .21         .21
Price range of Marathon Stock(b):
  - Low                             25-1/4      23-1/2       22-13/16     20-11/16     23-5/8       28-1/2      25-13/16    19-5/8
  - High                            30-3/8      29-5/8       29-3/16      27-1/2       30-5/8       33-7/8      32-3/4      31-3/8
---------------------------------------------------------------------------------------------------------------------------------
Steel Stock data:
-----------------
Income (loss) before
  extraordinary losses
  applicable to Steel Stock    $  (141)    $    17      $    54      $    41       $   32      $   (31)    $    52     $   (11)
  - Per share:basic              (1.59)        .19          .62          .45          .35         (.35)        .60        (.13)
              diluted            (1.59)        .19          .62          .45          .35         (.35)        .59        (.13)
Dividends paid per share           .25         .25          .25          .25          .25          .25         .25         .25
Price range of Steel Stock(b):
  - Low                             12-11/16    14-7/8       18-1/4       20-5/8       21-3/4       24-9/16     23-1/2      22-1/4
  - High                            18-5/16     19-11/16     26-7/8       32-15/16     33           30- 1/16    34-1/4      29-1/8
---------------------------------------------------------------------------------------------------------------------------------


(a) Certain items have been reclassified between revenues and cost of revenues,
    primarily to give effect to new accounting standards as disclosed in Note 2
    of the Notes to Consolidated Financial Statements. Amounts reclassified in
    the first, second and third quarters of 2000 were $(65) million, $(138)
    million and $(14) million, respectively, and for the first, second, third
    and fourth quarters of 1999 were $(97) million, $(82) million, $(113)
    million and $(172) million, respectively.
(b) Composite tape.

U-30


Principal Unconsolidated Investees (Unaudited)



                                                                        December 31, 2000
               Company                         Country                      Ownership                       Activity
---------------------------------------------------------------------------------------------------------------------------------
                                                                                              
Clairton 1314B Partnership, L.P.              United States                    10%                     Coke & Coke By-Products
CLAM Petroleum B.V.                           Netherlands                      50%                     Oil & Gas Production
Double Eagle Steel Coating Company            United States                    50%                     Steel Processing
Kenai LNG Corporation                         United States                    30%                     Natural Gas Liquification
LOCAP, Inc.                                   United States                    50% /(a)/               Pipeline & Storage Facilities
LOOP LLC                                      United States                    47% /(a)/               Offshore Oil Port
Manta Ray Offshore Gathering Company, LLC     United States                    24%                     Natural Gas Transmission
Minnesota Pipe Line Company                   United States                    33% /(a)/               Pipeline Facility
Nautilus Pipeline Company, LLC                United States                    24%                     Natural Gas Transmission
Odyssey Pipeline LLC                          United States                    29%                     Pipeline Facility
Poseidon Oil Pipeline Company, LLC            United States                    28%                     Crude Oil Transportation
PRO-TEC Coating Company                       United States                    50%                     Steel Processing
Republic Technologies International, LLC      United States                    16%                     Steel Products
Transtar, Inc.                                United States                    46%                     Transportation
USS-POSCO Industries                          United States                    50%                     Steel Processing
Worthington Specialty Processing              United States                    50%                     Steel Processing
---------------------------------------------------------------------------------------------------------------------------------

/(a)/ Represents the ownership of MAP.

Supplementary Information on Mineral Reserves Other Than Oil and Gas (Unaudited)

USX operates two underground coal mining complexes, the #50 Mine and Pinnacle
Preparation Plant in West Virginia, and the Oak Grove Mine and Concord
Preparation Plant in Alabama. USX also operates one iron ore surface mining
complex consisting of the open pit Minntac Mine and Pellet Plant in Minnesota.

Production History

     The following table provides a summary, by mining complex, of minerals
production in millions of tons for each of the last three years:



                                                                                                  2000         1999         1998
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                                   
Coal:
#50 Mine/Pinnacle Preparation Plant                                                                 3.3          4.1          4.5
Oak Grove Mine/Concord Preparation Plant                                                            2.2          2.1          2.8
                                                                                                  -----        -----        -----
     Total coal production                                                                          5.5          6.2          7.3
                                                                                                  =====        =====        =====
Iron Ore Pellets:
Minntac Mine and Pellet Plant                                                                      16.3         14.3         15.8
---------------------------------------------------------------------------------------------------------------------------------


     Adverse mining conditions in the form of unforeseen geologic conditions
occurred at both coal mining operations in the year 2000. Coal production was
diminished and mining costs were elevated. Force majeure conditions were
declared with respect to contracted coal deliveries with certain contracts
fulfilled by purchased substitutes and other contracts fulfilled by extension of
delivery time into 2001. These adverse mining conditions did not affect reserves
reported as of December 31, 2000.

     No recent adverse events affected iron ore pellet production other than
fluctuations in market demand.

                                                                            U-31


Supplementary Information on Mineral Reserves Other Than Oil and Gas (Unaudited)
continued

Coal Reserves
USX had 786.6 million short tons of recoverable coal reserves classified as
proven and probable at December 31, 2000. Proven and probable reserves are
defined by sites for inspection, sampling, and measurement generally less than 1
mile apart, such that continuity between points and subsequent economic
evaluation can be assured.
     Independent outside entities have reviewed USX's coal reserve estimates on
properties comprising approximately 70% of the stated coal reserves.
     The following table summarizes our proven and probable coal reserves as of
December 31, 2000, the status of the reserves as assigned or unassigned, our
property interest in the reserves, and certain characteristics of the reserves:



                            Proven and
                             Probable           Reserve Control        Coal Characteristics        As Received/(c)/
                                             -------------------------------------------------         BTU's Per    As Received/(c)/
Location                  Reserves/(a)(b)/   Owned       Leased      Grade          Volatility          Pound         % Sulfur
------------------------------------------------------------------------------------------------------------------------------------
                                                                                               
Assigned Reserves/(d)/:
Oak Grove Mine, AL               52.1         52.1          -     Metallurgical         Low       greater than 12,000 less than 1.0%
#50 Mine, WV                     88.2         76.0       12.2     Metallurgical         Low       greater than 12,000 less than 1.0%
                                -----        -----      -----
  Total assigned                140.3        128.1       12.2
                                -----        -----      -----
Unassigned Reserves/(e)/:
Alabama                         123.4        123.4          -     Metallurgical      Low to High  greater than 12,000 less than 1.0%
Alabama/(b)(f)/                  47.6         47.6          -         Steam          Low to High  greater than 12,000      0.7%-2.5%
Alabama                          31.9            -       31.9     Metallurgical        Medium     greater than 12,000 less than 1.0%
Illinois/(f)/                   374.8        374.8          -         Steam             High                   11,600           2.3%
Indiana, Pennsylvania,
  Tennessee, West Virginia/(f)/  68.6         68.6          -  Metallurgical/Steam   Low to High    11,600-13,000          1.0%-3.0%
                                -----        -----      -----
  Total unassigned              646.3        614.4       31.9
                                -----        -----      -----
Total Proven and Probable       786.6        742.5       44.1
------------------------------------------------------------------------------------------------------------------------------------


/(a)/ The amounts in this column reflect recoverable tons. Recoverable tons
      represent the amount of product that could be used internally or delivered
      to a customer after considering mining and preparation losses. Neither
      inferred reserves nor resources which exist in addition to proven and
      probable reserves were included in these figures.
/(b)/ All of USX's recoverable reserves would be recovered utilizing underground
      mining methods, with the exception of 17.2 million short tons of owned,
      unassigned, recoverable, steam grade reserves in Alabama which would be
      recovered utilizing surface mining methods.
/(c)/ "As received" means the quality parameters stated are with the expected
      product moisture content and quality values that a customer can reasonably
      expect to receive upon delivery.
/(d)/ Assigned Reserves means recoverable coal reserves which have been
      committed by USX to our operating mines and plant facilities.
/(e)/ Unassigned Reserves represent coal which has not been committed, and which
      would require new mines and or plant facilities before operations could
      begin on the property.
/(f)/ Represents non-compliance steam coal as defined by Phase II of the Clean
      Air Act, having sulfur content in excess of 1.2 pounds per million BTU's.

U-32


Supplementary Information on Mineral Reserves Other Than Oil and Gas (Unaudited)
Continued

Iron Ore Reserves
USX had 709.8 million short tons of recoverable iron ore reserves classified as
proven and probable at December 31, 2000. Proven and probable reserves are
defined by sites for inspection, sampling, and measurement generally less than
1,000 feet apart, such that continuity between points and subsequent economic
evaluation can be assured. Recoverable tons mean the tons of product that can be
used internally or delivered to a customer after considering mining and
benefication or preparation losses. Neither inferred reserves nor resources
which exist in addition to proven and probable reserves were included in these
figures.
     All 709.8 million tons of proven and probable reserves are assigned, which
means that they have been committed by USX to its one operating mine, and are of
blast furnace pellet grade. USX owns 219.2 million of these tons and leases the
remaining 490.6 million tons. USX does not own, or control by lease, any
unassigned iron ore reserves.
     Independent outside entities, including lessors, have reviewed USX's
estimates on approximately 75% of the stated iron ore reserves.

Supplementary Information on Oil and Gas Producing Activities (Unaudited)

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization



                                         United                        Other                        Equity
(In millions)        December 31         States         Europe         Intl.      Consolidated     Investees       Total
---------------------------------------------------------------------------------------------------------------------------
                                                                                               
2000
     Capitalized costs:
      Proved properties                 $ 5,752       $  4,739       $  1,373       $11,864       $    226       $ 12,090
      Unproved properties                   343            124            180           647              2            649
                                        ---------     ---------      ---------      ---------     ---------      ---------
         Total                            6,095          4,863          1,553        12,511            228         12,739
                                        ---------     ---------      ---------      ---------     ---------      ---------
     Accumulated depreciation,
      depletion and amortization:
      Proved properties                   3,435          3,074            420         6,929            170          7,099
      Unproved properties                   107              -             13           120              1            121
                                        ---------     ---------      ---------      ---------     ---------      ---------
         Total                            3,542          3,074            433         7,049            171          7,220
                                        ---------     ---------      ---------      ---------     ---------      ---------
     Net capitalized costs              $ 2,553       $  1,789       $  1,120       $ 5,462       $     57       $  5,519
---------------------------------------------------------------------------------------------------------------------------
1999
     Capitalized costs:
      Proved properties                 $ 8,270       $  4,465       $  1,270       $14,005       $    612       $ 14,617
      Unproved properties                   349             55            187           591            123            714
                                        ---------     ---------      ---------      ---------     ---------      ---------
         Total                            8,619          4,520          1,457        14,596            735         15,331
                                        ---------     ---------      ---------      ---------     ---------      ---------
     Accumulated depreciation,
      depletion and amortization:
      Proved properties                   5,019          2,859            136         8,014            169          8,183
      Unproved properties                    78              -              6            84              -             84
                                        ---------     ---------      ---------      ---------     ---------      ---------
         Total                            5,097          2,859            142         8,098            169          8,267
                                        ---------     ---------      ---------      ---------     ---------      ---------
     Net capitalized costs              $ 3,522       $  1,661       $  1,315       $ 6,498       $    566       $  7,064
---------------------------------------------------------------------------------------------------------------------------


                                                                            U-33


Supplementary Information on Oil and Gas Producing Activities
(Unaudited) Continued

Results of Operations for Oil and Gas Producing Activities, Excluding Corporate
Overhead and Interest Costs/(a)/



                                                  United                   Other                  Equity
 (In millions)                                    States      Europe       Intl.   Consolidated  Investees   Total
--------------------------------------------------------------------------------------------------------------------
                                                                                         
 2000: Revenues:
        Sales                                    $    783    $   579    $    310    $  1,672    $    145   $  1,817
        Transfers                                   1,337          -         188       1,525           -      1,525
        Other revenues/(b)/                          (875)        10          55        (810)          -       (810)
                                                 ---------  ---------   ---------   ---------   ---------  ---------
           Total revenues                           1,245        589         553       2,387         145      2,532
       Expenses:
        Production costs                             (371)      (111)       (133)       (615)        (34)      (649)
        Shipping and handling costs/(c)/              (72)         -           -         (72)          -        (72)
        Exploration expenses                         (125)       (37)        (74)       (236)         (6)      (242)
        Reorganization costs                          (45)       (12)        (10)        (67)          -        (67)
        Depreciation, depletion
           and amortization                          (380)      (175)       (122)       (677)        (27)      (704)
        Impairments                                    (5)         -        (188)       (193)          -       (193)
        Other expenses                                (33)        (3)        (15)        (51)          -        (51)
                                                 ---------  ---------   ---------   ---------   ---------  ---------
           Total expenses                          (1,031)      (338)       (542)     (1,911)        (67)    (1,978)
       Other production-related
           earnings (losses)/(d)/                       4        (21)          4         (13)          1        (12)
                                                 ---------  ---------   ---------   ---------   ---------  ---------
       Results before income taxes                    218        230          15         463          79        542
       Income taxes (credits)/(e)/                     70         62          (1)        131          27        158
                                                 ---------  ---------   ---------   ---------   ---------  ---------
       Results of operations                     $    148    $   168    $     16    $    332    $     52   $    384
--------------------------------------------------------------------------------------------------------------------
 1999: Revenues:
        Sales                                    $    547    $   431    $    200    $  1,178    $     33   $  1,211
        Transfers                                     882          -          88         970           -        970
        Other revenues/(b)/                             4          -          (2)          2           -          2
                                                 ---------  ---------   ---------   ---------   ---------  ---------
           Total revenues                           1,433        431         286       2,150          33      2,183
       Expenses:
        Production costs                             (322)      (137)        (99)       (558)        (25)      (583)
        Shipping and handling costs/(c)/              (77)         -           -         (77)          -        (77)
        Exploration expenses                         (134)       (42)        (51)       (227)         (4)      (231)
        Depreciation, depletion
           and amortization                          (362)      (143)        (99)       (604)        (13)      (617)
        Impairments                                   (16)         -           -         (16)          -        (16)
        Other expenses                                (28)        (7)        (15)        (50)          -        (50)
                                                 ---------  ---------   ---------   ---------   ---------  ---------
           Total expenses                            (939)      (329)       (264)     (1,532)        (42)    (1,574)
       Other production-related
           earnings (losses)/(d)/                       1          4           4           9           1         10
                                                 ---------  ---------   ---------   ---------   ---------  ---------
       Results before income taxes                    495        106          26         627          (8)       619
       Income taxes (credits)                         168         33          (7)        194          (3)       191
                                                 ---------  ---------   ---------   ---------   ---------  ---------
       Results of operations                     $    327    $    73    $     33    $    433    $     (5)  $    428
--------------------------------------------------------------------------------------------------------------------
 1998: Revenues:
        Sales                                    $    542    $   454    $     71    $  1,067    $     28   $  1,095
        Transfers                                     536          -          51         587           -        587
        Other revenues/(b)/                            43          -           -          43           -         43
                                                 ---------  ---------   ---------   ---------   ---------  ---------
           Total revenues                           1,121        454         122       1,697          28      1,725
       Expenses:
        Production costs                             (295)      (153)        (57)       (505)         (8)      (513)
        Shipping and handling costs/(c)/              (67)         -           -         (67)          -        (67)
        Exploration expenses                         (165)       (23)        (49)       (237)         (5)      (242)
        Depreciation, depletion
           and amortization                          (339)      (150)        (58)       (547)         (8)      (555)
        Impairments/(f)/                              (14)       (22)        (47)        (83)          -        (83)
        Other expenses                                (37)        (3)        (11)        (51)          -        (51)
                                                 ---------  ---------   ---------   ---------   ---------  ---------
           Total expenses                            (917)      (351)       (222)     (1,490)        (21)    (1,511)
       Other production-related
           earnings (losses)/(d)/                       1         15           3          19           1         20
                                                 ---------  ---------   ---------   ---------   ---------  ---------
       Results before income taxes                    205        118         (97)        226           8        234
       Income taxes (credits)                          61         22         (28)         55           3         58
                                                 ---------  ---------   ---------   ---------   ---------  ---------
       Results of operations                     $    144    $    96    $    (69)   $    171    $      5   $    176
--------------------------------------------------------------------------------------------------------------------

/(a)/ Includes the results of using derivative instruments to manage commodity
      and foreign currency risks.
/(b)/ Includes net gains (losses) on asset dispositions and contract
      settlements.
/(c)/ Represents a reclassification of shipping and handling costs previously
      reported as a reduction from oil and gas revenues.
/(d)/ Includes revenues, net of associated costs, from third-party activities
      that are an integral part of USX's production operations which may include
      the processing and/or transportation of third-party production, and the
      purchase and subsequent resale of gas utilized in reservoir management.
/(e)/ Excludes net valuation allowance tax charges of $205 million.
/(f)/ Includes suspended exploration well write-offs.

U-34


Supplementary Information on Oil and Gas Producing Activities
(Unaudited) Continued

Average Production Costs/(a)/



(Dollars per BOE)                                                                                2000         1999         1998
----------------------------------------------------------------------------------------------------------------------------------
                                                                                                              
United States                                                                                $     4.01   $     3.26   $     3.12
International  - Europe                                                                            3.82         4.62         4.29
               - Other International                                                               6.09         4.66         4.73
  Total Consolidated                                                                               4.29         3.73         3.55
               - Equity Investees/(b)/                                                             6.00        10.02         3.99
Worldwide                                                                                          4.35         3.83         3.56
----------------------------------------------------------------------------------------------------------------------------------

/(a)/ Production costs are as defined by the Securities and Exchange Commission
      and include property taxes, severance taxes and other costs, but exclude
      depreciation, depletion and amortization of capitalized acquisition,
      exploration and development costs and certain administrative costs.
      Natural gas volumes were converted to BOE using a conversion factor of six
      mcf of natural gas to one barrel of oil.
/(b)/ Represents CLAM and Sakhalin Energy for 2000 and 1999, and CLAM for 1998.

Average Sales Prices



                                                         Crude Oil and
                                                          Condensate             Natural Gas Liquids              Natural Gas
                                                 -------------------------  -------------------------   -------------------------
Average Sales Prices                               2000     1999     1998      2000     1999     1998      2000     1999    1998
                                                 -------  -------  -------   -------  ------- -------    ------- -------  -------
(excluding results of hedging)                                   (Dollars per Barrel)              (Dollars per Thousand Cubic Feet)
----------------------------------------------------------------------------------------------------------------------------------
                                                                                               
United States                                    $ 25.96  $ 15.78 $  10.60   $ 19.20 $  12.30 $  8.64   $   3.30 $  1.90  $  1.79
International - Europe                             27.90    17.59    12.87     24.98    13.84   11.49       2.56    2.03     2.07
              - Other International                25.77    16.77    11.31     23.48    13.49    8.38       3.20    1.64     1.34
Total Consolidated                                 26.22    16.21    11.14     20.35    12.67    9.32       3.08    1.90     1.85
              - Equity Investees/(a)/              29.64    23.43        -     28.74    13.22   12.65       2.75    1.87     2.37
Worldwide                                          26.42    16.25    11.14     20.37    12.67    9.33       3.08    1.90     1.86


                                                         Crude Oil and
                                                          Condensate             Natural Gas Liquids              Natural Gas
                                                 -------------------------  -------------------------   -------------------------
Average Sales Prices                               2000     1999     1998      2000     1999     1998      2000     1999    1998
                                                 -------  -------  -------   -------  ------- -------  -------   -------  -------
(including results of hedging)                                   (Dollars per Barrel)              (Dollars per Thousand Cubic Feet)
----------------------------------------------------------------------------------------------------------------------------------
                                                                                               
United States                                    $ 25.49  $ 15.68 $  10.60   $ 19.20 $  12.30 $  8.64   $   3.21 $  1.92  $  1.79
International - Europe                             27.90    17.59    12.87     24.98    13.84   11.49       2.56    2.03     2.07
              - Other International                25.77    16.63    11.31     23.48    13.49    8.38       3.14    1.66     1.34
Total Consolidated                                 25.91    16.12    11.14     20.35    12.67    9.32       3.02    1.91     1.85
              - Equity Investees/(a)/              29.64    23.43        -     28.74    13.22   12.65       2.75    1.87     2.37
Worldwide                                          26.13    16.16    11.14     20.37    12.67    9.33       3.02    1.91     1.86
----------------------------------------------------------------------------------------------------------------------------------

/(a)/ Represents CLAM and Sakhalin Energy for 2000 and 1999, and CLAM for 1998.

                                                                            U-35


Supplementary Information on Oil and Gas Producing Activities (Unaudited)
continued
Costs Incurred for Property Acquisition, Exploration and Development -
Including Capital Expenditures



                                    United                       Other                  Equity
 (In millions)                      States          Europe       Intl.   Consolidated  Investees   Total
-----------------------------------------------------------------------------------------------------------
                                                                               
 2000: Property acquisition:
        Proved                     $    128        $     -    $     12    $    140    $      -   $    140
        Unproved                         (5)/(a)/        -          10           5           -          5
       Exploration                      161             33          93         287           2        289
       Development                      288             42         103         433          77        510
-----------------------------------------------------------------------------------------------------------
 1999: Property acquisition:
        Proved                     $     20        $     -    $     10    $     30    $      -   $     30
        Unproved                         26             12         107         145           -        145
       Exploration                      141             47          64         252           8        260
       Development                      232             34         117         383          84        467
-----------------------------------------------------------------------------------------------------------
 1998: Property acquisition:
        Proved                     $      3        $     3    $  1,051    $  1,057    $      -   $  1,057
        Unproved                         82              -          57         139           -        139
       Exploration                      217             39          75         331          11        342
       Development                      431             39          46         516         165        681
-----------------------------------------------------------------------------------------------------------


/(a)/ Includes proceeds of $25 million realized from the reduction of mineral
      interests.

Estimated Quantities of Proved Oil and Gas Reserves
     The following estimates of net reserves have been determined by deducting
royalties of various kinds from USX's gross reserves. The reserve estimates are
believed to be reasonable and consistent with presently known physical data
concerning size and character of the reservoirs and are subject to change as
additional knowledge concerning the reservoirs becomes available. The estimates
include only such reserves as can reasonably be classified as proved; they do
not include reserves which may be found by extension of proved areas or reserves
recoverable by secondary or tertiary recovery methods unless these methods are
in operation and are showing successful results. Undeveloped reserves consist of
reserves to be recovered from future wells on undrilled acreage or from existing
wells where relatively major expenditures will be required to realize
production. USX did not have any quantities of oil and gas reserves subject to
long-term supply agreements with foreign governments or authorities in which USX
acts as producer.



                                        United                   Other                  Equity
(Millions of barrels)                   States      Europe       Intl.   Consolidated  Investees   Total
-----------------------------------------------------------------------------------------------------------
                                                                                 
Liquid Hydrocarbons
 Proved developed and
  undeveloped reserves:
   Beginning of year - 1998                590        161          26         777          82        859
   Purchase of reserves in place             1          -         156         157           -        157
   Revisions of previous estimates          (1)       (28)          1         (28)         (2)       (30)
   Improved recovery                         3          -           -           3           -          3
   Extensions, discoveries and
     other additions                        10          4          18          32           -         32
   Production                              (49)       (15)         (7)        (71)          -        (71)
   Sales of reserves in place               (5)         -           -          (5)          -         (5)
                                       --------   --------    --------    --------    --------   --------
   End of year - 1998                      549        122         194         865          80        945
   Purchase of reserves in place            14          -           7          21           -         21
   Revisions of previous estimates           2        (20)          -         (18)         (3)       (21)
   Improved recovery                        11          -           1          12           -         12
   Extensions, discoveries and
     other additions                         9          -           5          14           -         14
   Production                              (53)       (12)        (11)        (76)          -        (76)
   Sales of reserves in place              (12)         -          (9)        (21)          -        (21)
                                       --------   --------    --------    --------    --------   --------
   End of year - 1999                      520         90         187         797          77        874
   Purchase of reserves in place            27          -           -          27           -         27
   Exchange of interest/(a)/                 6         60           -          66         (73)        (7)
   Revisions of previous estimates          (4)       (35)        (21)        (60)          -        (60)
   Improved recovery                         7          -           -           7           -          7
   Extensions, discoveries and
     other additions                        15          3           1          19           -         19
   Production                              (48)       (10)        (13)        (71)         (4)       (75)
   Sales of reserves in place              (65)         -          (3)        (68)          -        (68)
                                       --------   --------    --------    --------    --------   --------
   End of year - 2000                      458        108         151         717           -        717
-----------------------------------------------------------------------------------------------------------
 Proved developed reserves:
   Beginning of year - 1998                486        161          12         659           -        659
   End of year - 1998                      489        119          67         675           -        675
   End of year - 1999                      476         90          72         638          69        707
   End of year - 2000                      414         74          57         545           -        545
-----------------------------------------------------------------------------------------------------------

/(a)/ Reserves represent the exchange of an equity interest in Sakhalin Energy
      Investment Company Ltd. for certain interests in the UK Atlantic Margin
      area and the Gulf of Mexico.

U-36


Supplementary Information on Oil and Gas Producing Activities (Unaudited)
continued
Estimated Quantities of Proved Oil and Gas Reserves (continued)



                                       United                   Other                  Equity
(Billions of cubic feet)               States      Europe       Intl.   Consolidated  Investees   Total
----------------------------------------------------------------------------------------------------------
                                                                                
Natural Gas
 Proved developed and
  undeveloped reserves:
   Beginning of year - 1998              2,232      1,048          23       3,303         111      3,414
   Purchase of reserves in place            10          -         782         792           -        792
   Revisions of previous estimates         (16)        10          (1)         (7)          5         (2)
   Improved recovery                         -          -           -           -           -          -
   Extensions, discoveries and
     other additions                       238         32          55         325           5        330
   Production                             (272)      (124)        (29)       (425)        (11)      (436)
   Sales of reserves in place              (29)         -           -         (29)          -        (29)
                                       --------   --------    --------    --------    --------   --------
   End of year - 1998                    2,163        966         830       3,959         110      4,069
   Purchase of reserves in place             5          -          11          16           -         16
   Revisions of previous estimates         (83)       (81)         (3)       (167)         13       (154)
   Improved recovery                         8          -           2          10           -         10
   Extensions, discoveries and
     other additions                       281          -          94         375          13        388
   Production                             (275)      (111)        (59)       (445)        (13)      (458)
   Sales of reserves in place              (42)         -         (42)        (84)          -        (84)
                                       --------   --------    --------    --------    --------   --------
   End of year - 1999                    2,057        774         833       3,664         123      3,787
   Purchase of reserves in place           114          -          15         129           -        129
   Exchange of interest/(a)/                14         31           -          45           -         45
   Revisions of previous estimates        (154)      (114)       (347)       (615)        (26)      (641)
   Improved recovery                         -          -           -           -           -          -
   Extensions, discoveries and
     other additions                       217         35          38         290           2        292
   Production                             (268)      (112)        (52)       (432)        (10)      (442)
   Sales of reserves in place              (66)         -         (10)        (76)          -        (76)
                                       --------   --------    --------    --------    --------   --------
   End of year - 2000                    1,914        614         477       3,005          89      3,094
----------------------------------------------------------------------------------------------------------
 Proved developed reserves:
   Beginning of year - 1998              1,702      1,024          19       2,745          78      2,823
   End of year - 1998                    1,678        909         534       3,121          76      3,197
   End of year - 1999                    1,550        741         497       2,788          65      2,853
   End of year - 2000                    1,421        563         381       2,365          52      2,417
----------------------------------------------------------------------------------------------------------


/(a)/ Reserves represent the exchange of an equity interest in Sakhalin Energy
      Investment Company Ltd. for certain interests in the UK Atlantic Margin
      area and the Gulf of Mexico.

Standardized Measure of Discounted Future Net Cash Flows and Changes Therein
Relating to Proved Oil and Gas Reserves

     Estimated discounted future net cash flows and changes therein were
determined in accordance with Statement of Financial Accounting Standards No.
69. Certain information concerning the assumptions used in computing the
valuation of proved reserves and their inherent limitations are discussed below.
USX believes such information is essential for a proper understanding and
assessment of the data presented.
     Future cash inflows are computed by applying year-end prices of oil and gas
relating to USX's proved reserves to the year-end quantities of those reserves.
Future price changes are considered only to the extent provided by contractual
arrangements in existence at year-end.
     The assumptions used to compute the proved reserve valuation do not
necessarily reflect USX's expectations of actual revenues to be derived from
those reserves nor their present worth. Assigning monetary values to the
estimated quantities of reserves, described on the preceding page, does not
reduce the subjective and ever-changing nature of such reserve estimates.
     Additional subjectivity occurs when determining present values because the
rate of producing the reserves must be estimated. In addition to uncertainties
inherent in predicting the future, variations from the expected production rate
also could result directly or indirectly from factors outside of USX's control,
such as unintentional delays in development, environmental concerns, changes in
prices or regulatory controls.
     The reserve valuation assumes that all reserves will be disposed of by
production. However, if reserves are sold in place or subjected to participation
by foreign governments, additional economic considerations also could affect the
amount of cash eventually realized.
     Future development and production costs, including abandonment and
dismantlement costs, are computed by estimating the expenditures to be incurred
in developing and producing the proved oil and gas reserves at the end of the
year, based on year-end costs and assuming continuation of existing economic
conditions.
     Future income tax expenses are computed by applying the appropriate year-
end statutory tax rates, with consideration of future tax rates already
legislated, to the future pretax net cash flows relating to USX's proved oil and
gas reserves. Permanent differences in oil and gas related tax credits and
allowances are recognized.
     Discount was derived by using a discount rate of 10 percent a year to
reflect the timing of the future net cash flows relating to proved oil and gas
reserves.

                                                                            U-37


Supplementary Information on Oil and Gas Producing Activities
(Unaudited) continued

Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil
and Gas Reserves (continued)



                                       United                   Other                  Equity
(In millions)                          States      Europe       Intl.   Consolidated  Investees   Total
----------------------------------------------------------------------------------------------------------
                                                                              
December 31, 2000:
 Future cash inflows                  $ 25,052    $ 4,571    $  6,704    $ 36,327    $    313   $ 36,640
 Future production costs                (5,689)    (1,662)     (1,156)     (8,507)       (125)    (8,632)
 Future development costs                 (638)      (185)       (309)     (1,132)        (26)    (1,158)
 Future income tax expenses             (6,290)      (677)     (2,102)     (9,069)        (76)    (9,145)
                                      ---------  ---------   ---------   ---------   ---------  ---------
 Future net cash flows                  12,435      2,047       3,137      17,619          86     17,705
 10% annual discount for
   estimated timing of cash flows       (5,403)      (486)     (1,524)     (7,413)        (19)    (7,432)
                                      ---------  ---------   ---------   ---------   ---------  ---------
 Standardized measure of
   discounted future net cash
   flows relating to proved oil
   and gas reserves                   $  7,032    $ 1,561    $  1,613    $ 10,206    $     67   $ 10,273
----------------------------------------------------------------------------------------------------------
December 31, 1999:
 Future cash inflows                  $ 15,393    $ 4,426    $  5,242    $ 25,061    $  2,154   $ 27,215
 Future production costs                (4,646)    (1,864)     (1,107)     (7,617)       (850)    (8,467)
 Future development costs                 (445)       (86)       (315)       (846)        (88)      (934)
 Future income tax expenses             (3,102)      (987)     (1,581)     (5,670)       (328)    (5,998)
                                      ---------  ---------   ---------   ---------   ---------  ---------
 Future net cash flows                   7,200      1,489       2,239      10,928         888     11,816
 10% annual discount for
   estimated timing of cash flows       (3,371)      (374)       (862)     (4,607)       (372)    (4,979)
                                      ---------  ---------   ---------   ---------   ---------  ---------
 Standardized measure of
   discounted future net cash
   flows relating to proved oil
   and gas reserves                   $  3,829    $ 1,115    $  1,377    $  6,321    $    516   $  6,837
----------------------------------------------------------------------------------------------------------
December 31, 1998:
 Future cash inflows                  $  8,442    $ 3,850    $  2,686    $ 14,978    $  1,036   $ 16,014
 Future production costs                (3,731)    (2,240)       (950)     (6,921)       (586)    (7,507)
 Future development costs                 (559)      (130)       (323)     (1,012)       (124)    (1,136)
 Future income tax expenses               (816)      (630)       (542)     (1,988)        (45)    (2,033)
                                      ---------  ---------   ---------   ---------   ---------  ---------
 Future net cash flows                   3,336        850         871       5,057         281      5,338
 10% annual discount for
   estimated timing of cash flows       (1,462)      (256)       (392)     (2,110)       (136)    (2,246)
                                      ---------  ---------   ---------   ---------   ---------  ---------
 Standardized measure of
   discounted future net cash
   flows relating to proved oil
   and gas reserves                   $  1,874    $   594    $    479    $  2,947    $    145   $  3,092
----------------------------------------------------------------------------------------------------------


Summary of Changes in Standardized Measure of Discounted Future Net Cash Flows
Relating to Proved Oil and Gas Reserves



                                            Consolidated                 Equity Investees                      Total
                                  ------------------------------- ----------------------------- -------------------------------
(In millions)                       2000       1999      1998       2000       1999       1998       2000       1999      1998
--------------------------------------------------------------------------------------------------------------------------------
                                                                                             
Sales and transfers of
 oil and gas produced,
 net of production costs          $(2,508)  $(1,516)   $(1,125)   $  (111)   $   (8)   $   (20)   $(2,619)   $(1,524)   $(1,145)
Net changes in prices and
 production costs related
 to future production               6,820     5,891     (3,579)        12       484       (372)     6,832      6,375    (3,951)
Extensions, discoveries and
 improved recovery, less
 related costs                      1,472       566        284          3         9          4      1,475        575       288
Development costs incurred
 during the period                    433       383        516         77        84        165        510        467       681
Changes in estimated future
 development costs                   (273)      (69)      (285)       (22)      (52)      (100)      (295)      (121)     (385)
Revisions of previous
 quantity estimates                (1,899)     (346)      (110)       (43)       (8)        (2)    (1,942)      (354)     (112)
Net changes in purchases
 and sales of minerals in place       380        68        637          -         -          -        380         68       637
Net change in exchanges of
 reserves in place                    755         -          -       (547)        -          -        208          -         -
Accretion of discount                 843       382        623         62        18         39        905        400       662
Net change in income taxes         (1,969)   (1,995)       825         90      (117)        57     (1,879)    (2,112)      882
Other                                (169)       10        401         30       (39)       102       (139)       (29)      503
--------------------------------------------------------------------------------------------------------------------------------
Net change for the year             3,885     3,374     (1,813)      (449)      371       (127)     3,436      3,745    (1,940)
Beginning of year                   6,321     2,947      4,760        516       145        272      6,837      3,092     5,032
--------------------------------------------------------------------------------------------------------------------------------
End of year                       $10,206   $ 6,321    $ 2,947    $    67    $  516    $   145    $10,273    $ 6,837    $3,092
--------------------------------------------------------------------------------------------------------------------------------


U-38


Five-Year Operating Summary - Marathon Group



                                                                        2000       1999       1998     1997      1996
-----------------------------------------------------------------------------------------------------------------------
                                                                                                  
Net Liquid Hydrocarbon Production (thousands of barrels per day)
 United States (by region)
   Alaska                                                                  -          -         -         -         8
   Gulf Coast                                                             62         74        55        29        30
   Southern                                                                5          5         6         8         9
   Central                                                                 4          4         4         5         4
   Mid-Continent                                                          34         38        44        46        45
   Rocky Mountain                                                         26         24        26        27        26
                                                                     -------------------------------------------------
      Total United States                                                131        145       135       115       122
                                                                     -------------------------------------------------
 International
   Canada                                                                 19         17         6         -         -
   Egypt                                                                   1          5         8         8         8
   Gabon                                                                  16          9         5         -         -
   Norway                                                                  -          -         1         2         3
   United Kingdom                                                         29         31        41        39        48
                                                                     -------------------------------------------------
      Total International                                                 65         62        61        49        59
                                                                     -------------------------------------------------
       Consolidated                                                      196        207       196       164       181
 Equity investee/(a)/                                                     11          1         -         -         -
                                                                     -------------------------------------------------
         Total                                                           207        208       196       164       181
 Natural gas liquids included in above                                    22         19        17        17        17
-----------------------------------------------------------------------------------------------------------------------
Net Natural Gas Production (millions of cubic feet per day)
 United States (by region)
   Alaska                                                                160        148       144       151       145
   Gulf Coast                                                             88        107        84        78        88
   Southern                                                              147        178       208       189       161
   Central                                                               156        134       117       119       109
   Mid-Continent                                                         133        129       125       125       122
   Rocky Mountain                                                         47         59        66        60        51
                                                                     -------------------------------------------------
      Total United States                                                731        755       744       722       676
                                                                     -------------------------------------------------
 International
   Canada                                                                143        150        65         -         -
   Egypt                                                                   -         13        16        11        13
   Ireland                                                               115        132       168       228       259
   Norway                                                                  -         26        27        54        87
   United Kingdom - equity                                               212        168       165       130       140
                  - other/(b)/                                            11         16        23        32        32
                                                                     -------------------------------------------------
      Total International                                                481        505       464       455       531
                                                                     -------------------------------------------------
       Consolidated                                                    1,212      1,260     1,208     1,177     1,207
 Equity investee/(c)/                                                     29         36        33        42        45
                                                                     -------------------------------------------------
         Total                                                         1,241      1,296     1,241     1,219     1,252
-----------------------------------------------------------------------------------------------------------------------
Average Sales Prices
 Liquid Hydrocarbons (dollars per barrel)/(d)//(e)/
   United States                                                      $25.11     $15.44    $10.42    $16.88    $18.58
   International                                                       26.54      16.90     12.24     18.77     20.34
 Natural Gas (dollars per thousand cubic feet)/(d)//(e)/
   United States                                                      $ 3.30     $ 1.90    $ 1.79   $  2.20   $  2.09
   International                                                        2.76       1.90      1.94      2.00      1.97
-----------------------------------------------------------------------------------------------------------------------
Net Proved Reserves at year-end (developed and undeveloped)
 Liquid Hydrocarbons (millions of barrels)
   United States                                                         458        520       549       590       570
   International                                                         259        277       316       187       203
                                                                     -------------------------------------------------
      Consolidated                                                       717        797       865       777       773
   Equity investee/(a)/                                                    -         77        80        82         -
                                                                     -------------------------------------------------
         Total                                                           717        874       945       859       773
 Developed reserves as % of total net reserves                            76%        81%       71%       77%       80%
-----------------------------------------------------------------------------------------------------------------------
 Natural Gas (billions of cubic feet)
   United States                                                       1,914      2,057     2,163     2,232     2,251
   International                                                       1,091      1,607     1,796     1,071     1,199
                                                                     -------------------------------------------------
      Consolidated                                                     3,005      3,664     3,959     3,303     3,450
   Equity investee/(c)/                                                   89        123       110       111       132
                                                                     -------------------------------------------------
         Total                                                         3,094      3,787     4,069     3,414     3,582
 Developed reserves as % of total net reserves                            78%        75%       79%       83%       83%
-----------------------------------------------------------------------------------------------------------------------


/(a)/ Represents Marathon's equity interest in Sakhalin Energy Investment
      Company Ltd. and CLAM Petroleum B.V.
/(b)/ Represents gas acquired for injection and subsequent resale.
/(c)/ Represents Marathon's equity interest in CLAM Petroleum B.V.
/(d)/ Prices exclude gains/losses from hedging activities.
/(e)/ Prices exclude equity investees and purchase/resale gas.

                                                                            U-39


                        Five-Year Operating Summary - Marathon Group continued



                                                                                    2000/(a)/ 1999/(a)/ 1998/(a)/  1997     1996
                       -----------------------------------------------------------------------------------------------------------
                                                                                                            
                         U.S. Refinery Operations (thousands of barrels per day)
                         In-use crude oil capacity at year-end                       935       935        935      575       570
                         Refinery runs - crude oil refined                           900       888        894      525       511
                                       - other charge and blend stocks               141       139        127       99        96
                         In-use crude oil capacity utilization rate                   96%       95%        96%      92%       90%
                       -----------------------------------------------------------------------------------------------------------
                        Source of Crude Processed (thousands of barrels per day)
                         United States                                               400       349        317      202       229
                         Canada                                                      102        92         98       24        18
                         Middle East and Africa                                      346       363        394      241       193
                         Other International                                          52        84         85       58        73
                                                                                  -----------------------------------------------
                              Total                                                  900       888        894      525       513
                       -----------------------------------------------------------------------------------------------------------
                        Refined Product Yields (thousands of barrels per day)
                         Gasoline                                                    552       566        545      353       345
                         Distillates                                                 278       261        270      154       155
                         Propane                                                      20        22         21       13        13
                         Feedstocks and special products                              74        66         64       36        35
                         Heavy fuel oil                                               43        43         49       35        30
                         Asphalt                                                      74        69         68       39        36
                                                                                  -----------------------------------------------
                              Total                                                1,041     1,027      1,017      630       614
                       -----------------------------------------------------------------------------------------------------------
                        Refined Products Yields (% breakdown)
                         Gasoline                                                     53%       55%        54%      56%       56%
                         Distillates                                                  27        25         27       24        25
                         Other products                                               20        20         19       20        19
                                                                                  -----------------------------------------------
                              Total                                                  100%      100%       100%     100%      100%
                       -----------------------------------------------------------------------------------------------------------
                        U.S. Refined Product Sales Volumes (thousands of barrels per day)
                         Gasoline                                                    746       714        671      452       468
                         Distillates                                                 352       331        318      198       192
                         Propane                                                      21        23         21       12        12
                         Feedstocks and special products                              69        66         67       40        37
                         Heavy fuel oil                                               43        43         49       34        31
                         Asphalt                                                      75        74         72       39        35
                                                                                  ------------------------------------------------
                              Total                                                1,306     1,251      1,198      775       775
                         Matching buy/sell volumes included in above                  52        45         39       51        71
                       -----------------------------------------------------------------------------------------------------------
                        Refined Products Sales Volumes by Class of Trade (as a %
                         of total sales volumes)
                         Wholesale - independent private-brand
                                        marketers and consumers                       65%       66%        65%      61%       62%
                         Marathon and Ashland brand jobbers and dealers               12        11         11       13        13
                         Speedway SuperAmerica retail outlets                         23        23         24       26        25
                                                                                  ------------------------------------------------
                              Total                                                  100%      100%       100%     100%      100%
                       -----------------------------------------------------------------------------------------------------------
                        Refined Products (dollars per barrel)
                         Average sales price                                      $38.24    $24.59     $20.65   $26.38    $27.43
                         Average cost of crude oil throughput                      29.07     18.66      13.02    19.00     21.94
                       -----------------------------------------------------------------------------------------------------------
                        Petroleum Inventories at year-end (thousands of barrels)
                         Crude oil, raw materials and natural gas liquids         33,720    34,255     35,630   19,351    20,047
                         Refined products                                         34,386    32,853     32,334   20,598    21,283
                       -----------------------------------------------------------------------------------------------------------
                        U.S. Refined Product Marketing Outlets at year-end
                         MAP operated terminals                                       91        93         88       51        51
                         Retail- Marathon and Ashland brand outlets                3,728     3,482      3,117    2,465     2,392
                               - Speedway SuperAmerica outlets                     2,242     2,433      2,257    1,544     1,592
                       -----------------------------------------------------------------------------------------------------------
                        Pipelines (miles of common carrier pipelines)/(b)/
                         Crude Oil - gathering lines                                 419       557      2,827    1,003     1,052
                                   - trunklines                                    4,623     4,720      4,859    2,665     2,665
                         Products  - trunklines                                    2,834     2,856      2,861    2,310     2,310
                                                                                  ------------------------------------------------
                              Total                                                7,876     8,133     10,547    5,978     6,027
                       -----------------------------------------------------------------------------------------------------------
                        Pipeline Barrels Handled (millions)/(c)/
                         Crude Oil - gathering lines                                22.7      30.4       47.8     43.9      43.2
                                   - trunklines                                    563.6     545.7      571.9    369.6     378.7
                         Products  - trunklines                                    329.7     331.9      329.7    262.4     274.8
                                                                                  ------------------------------------------------
                              Total                                                916.0     908.0      949.4    675.9     696.7
                       -----------------------------------------------------------------------------------------------------------
                        River Operations
                         Barges    - owned/leased                                    158       169        169        -         -
                         Boats     - owned/leased                                      6         8          8        -         -
                       -----------------------------------------------------------------------------------------------------------

                       /(a)/ 1998-2000 statistics include 100% of MAP and should
                             be considered when compared to prior periods.
                       /(b)/ Pipelines for downstream operations also include
                             non-common carrier, leased and equity investees.
                       /(c)/ Pipeline barrels handled on owned common carrier
                             pipelines, excluding equity investees.

U-40


                        Five-Year Operating Summary - U. S. Steel Group


                        (Thousands of net tons, unless otherwise noted)       2000        1999     1998          1997       1996
                       -----------------------------------------------------------------------------------------------------------
                                                                                                           
                        Raw Steel Production
                         Gary, IN                                             6,610       7,102     6,468       7,428       6,840
                         Mon Valley, PA                                       2,683       2,821     2,594       2,561       2,746
                         Fairfield, AL                                        2,069       2,109     2,152       2,361       1,862
                         Kosice, Slovak Republic                                382          -          -           -          -
                                                                            ------------------------------------------------------
                               Total                                         11,744      12,032    11,214      12,350      11,448
                       -----------------------------------------------------------------------------------------------------------
                        Raw Steel Capability
                         Domestic Steel                                      12,800      12,800    12,800      12,800      12,800
                         U. S. Steel Kosice/(a)/                                467           -         -           -          -
                                                                            ------------------------------------------------------
                               Total                                         13,267      12,800    12,800      12,800      12,800
                               Total production as % of total capability       88.5        94.0      87.6        96.5        89.4
                       -----------------------------------------------------------------------------------------------------------
                        Hot Metal Production
                         Domestic Steel                                       9,904      10,344     9,743      10,591       9,716
                         U. S. Steel Kosice                                     340           -         -           -          -
                                                                            ------------------------------------------------------
                               Total                                         10,244      10,344     9,743      10,591       9,716
                       -----------------------------------------------------------------------------------------------------------
                        Coke Production
                         Domestic Steel/(b)/                                  5,003       4,619     4,835       5,757       6,777
                         U. S. Steel Kosice                                     188           -         -           -          -
                                                                            ------------------------------------------------------
                               Total                                          5,191       4,619     4,835       5,757       6,777
                       -----------------------------------------------------------------------------------------------------------
                        Iron Ore Pellets - Minntac, MN
                         Shipments                                           15,020      15,025    15,446      16,403      14,962
                       -----------------------------------------------------------------------------------------------------------
                        Coal Shipments                                        6,779       6,924     7,670       7,811       7,117
                       -----------------------------------------------------------------------------------------------------------
                        Steel Shipments by Product - Domestic Steel
                         Sheet and semi-finished steel products               7,409       8,114     7,608       8,170       8,677
                         Tubular, plate and tin mill products                 3,347       2,515     3,078       3,473       2,695
                                                                            ------------------------------------------------------
                               Total                                         10,756      10,629    10,686      11,643      11,372
                               Total as % of domestic steel industry            9.8        10.0      10.5        10.9        11.3
                       -----------------------------------------------------------------------------------------------------------
                        Steel Shipments by Product - U. S. Steel Kosice
                         Sheet and semi-finished steel products                 207           -         -           -          -
                         Tubular, plate and tin mill products                   110           -         -           -          -
                                                                            ------------------------------------------------------
                               Total                                            317           -         -           -           -
                       -----------------------------------------------------------------------------------------------------------
                        Steel Shipments by Market - Domestic Steel
                         Steel service centers                                2,315       2,456     2,563       2,746       2,831
                         Transportation                                       1,466       1,505     1,785       1,758       1,721
                         Further conversion:
                           Joint ventures                                     1,771       1,818     1,473       1,568       1,542
                           Trade customers                                    1,174       1,633     1,140       1,378       1,227
                         Containers                                             702         738       794         856         874
                         Construction                                           936         844       987         994         865
                         Oil, gas and petrochemicals                            973         363       509         810         746
                         Export                                                 544         321       382         453         493
                         All other                                              875         951     1,053       1,080       1,073
                                                                            ------------------------------------------------------
                               Total                                         10,756      10,629    10,686      11,643      11,372
                       -----------------------------------------------------------------------------------------------------------
                        Average Steel Price Per Ton
                         Domestic Steel                                     $   450     $  $420   $   469     $   479     $   467
                         U. S. Steel Kosice                                     269           -         -           -           -
                       -----------------------------------------------------------------------------------------------------------


                       /(a)/ Represents the operations of U. S. Steel Kosice
                             s.r.o., following the acquisition of the
                             steelmaking operations and related assets of VSZ
                             a.s. on November 24, 2000.
                       /(b)/ The reduction in coke production after 1996
                              reflected U. S. Steel's entry into a strategic
                              partnership with two limited partners on June 1,
                              1997, to acquire an interest in three coke
                              batteries at its Clairton (Pa.) Works.


                                                                            U-41


                        Five-Year Financial Summary



                        (Dollars in millions, except as noted)            2000        1999         1998         1997      1996
                       ----------------------------------------------------------------------------------------------------------
                                                                                                         
                        Statement of Operations
                        Revenues and other income/(a)/                  $ 39,914    $ 29,119      $28,077    $  22,824   $ 22,938
                        Income from operations                             1,752       1,863        1,517        1,705      1,779
                         Includes:
                           Joint venture formation charges                  (931)          -            -            -          -
                           Inventory market valuation (charges) credits        -         551         (267)        (284)       209
                           Gain on ownership change in MAP                    12          17          245            -          -
                        Income from continuing operations               $    411    $    705      $   674    $     908   $    946
                        Income from discontinued operations                    -           -            -           80          6
                        Extraordinary losses                                   -          (7)           -            -         (9)
                                                                        ---------------------------------------------------------
                         Net Income                                     $    411    $    698      $   674    $     988   $    943
                       ----------------------------------------------------------------------------------------------------------
                        Applicable to Marathon Stock
                         Income before extraordinary loss               $    432    $    654      $   310    $     456   $    671
                         Income before extraordinary loss
                           per share- basic (in dollars)                    1.39        2.11         1.06         1.59       2.33
                                    - diluted (in dollars)                  1.39        2.11         1.05         1.58       2.31
                         Net income                                          432         654          310          456        664
                         Net income per share - basic (in dollars)          1.39        2.11         1.06         1.59       2.31
                                              - diluted (in dollars)        1.39        2.11         1.05         1.58       2.29
                         Dividends paid per share (in dollars)               .88         .84          .84          .76        .70
                       ----------------------------------------------------------------------------------------------------------
                        Applicable to Steel Stock
                         Income (loss) before extraordinary losses      $    (29)   $     42      $   355    $     449   $    253
                         Income (loss) before extraordinary losses
                           per share- basic (in dollars)                    (.33)        .48         4.05         5.24       3.00
                                    - diluted (in dollars)                  (.33)        .48         3.92         4.88       2.97
                         Net income (loss)                                   (29)         35          355          449        251
                         Net income (loss) per share
                                    - basic (in dollars)                    (.33)        .40         4.05         5.24       2.98
                                    - diluted (in dollars)                  (.33)        .40         3.92         4.88       2.95
                         Dividends paid per share (in dollars)              1.00        1.00         1.00         1.00       1.00
                       ----------------------------------------------------------------------------------------------------------
                        Balance Sheet Position at year-end
                         Cash and cash equivalents                      $    559    $    133      $   146    $      54   $     55
                         Total assets                                     23,401      22,931       21,133       17,284     16,980
                         Capitalization:
                           Notes payable                                $    150    $      -      $   145    $     121   $     81
                           Total long-term debt                            4,460       4,283        3,991        3,403      4,212
                           Preferred stock of subsidiary and
                             trust preferred securities                      433         433          432          432        250
                           Minority interest in MAP                        1,840       1,753        1,590            -          -
                           Redeemable Delhi Stock                              -           -            -          195          -
                           Preferred stock                                     2           3            3            3          7
                           Common stockholders' equity                     6,762       6,853        6,402        5,397      5,015
                                                                        ---------------------------------------------------------
                              Total capitalization                      $ 13,647    $ 13,325      $12,563    $   9,551   $  9,565
                       ----------------------------------------------------------------------------------------------------------
                         % of total debt to capitalization/(b)/             36.9        35.4         36.4         41.4       47.5
                       ----------------------------------------------------------------------------------------------------------
                        Cash Flow Data
                         Net cash from operating activities             $  2,531    $  1,936      $ 2,022    $   1,464   $  1,655
                         Capital expenditures                              1,669       1,665        1,580        1,373      1,168
                         Disposal of assets                                  560         366           86          481        443
                         Dividends paid                                      371         354          342          316        307
                       ----------------------------------------------------------------------------------------------------------
                        Employee Data
                         Total employment costs/(c)(d)/                 $  2,692    $  2,582      $ 2,372    $   2,289   $  2,179
                         Average number of employees/(c)(d)/              52,459      52,596       44,860       41,620     41,553
                         Number of pensioners at year-end/(d)/            97,594     100,504/(e)/  95,429       97,051     99,713
                       ----------------------------------------------------------------------------------------------------------

                       /(a)/ 1996-1999 reclassified to conform to 2000
                             classifications.
                       /(b)/ Total debt represents the sum of notes payable,
                             total long-term debt and preferred stock of
                             subsidiary and trust preferred securities.
                       /(c)/ Includes U. S. Steel Kosice s.r.o. from date of
                             acquisition in 2000 and excludes the Delhi
                             Companies sold in 1997.
                       /(d)/ Data for 1998 includes Ashland employees from
                             the date of their payroll transfer to MAP, which
                             occurred at various times throughout 1998. These
                             employees were contracted to MAP in 1998, prior to
                             their payroll transfer.
                       /(e)/ Includes approximately 8,000 surviving spouse
                             beneficiaries added to the U. S. Steel pension plan
                             in 1999.

U-42


                        Management's Discussion and Analysis


                            USX Corporation ("USX") is a diversified company
                        engaged primarily in the energy business through its
                        Marathon Group, and in the steel business through its
                        U.S. Steel Group.

                            Effective October 31, 1997, USX sold Delhi Gas
                        Pipeline Corporation and other subsidiaries of USX that
                        comprised all of the USX - Delhi Group ("Delhi
                        Companies"). On January 26, 1998, USX used the $195
                        million net proceeds from the sale to redeem all of the
                        9.45 million outstanding shares of USX - Delhi Group
                        Common Stock. For additional information, see Note 5 to
                        the USX Consolidated Financial Statements.

                            On January 1, 1998, Marathon Oil Company
                        ("Marathon") transferred certain refining, marketing and
                        transportation ("RM&T") net assets to Marathon Ashland
                        Petroleum LLC ("MAP"), a new consolidated subsidiary.
                        Also on January 1, 1998, Marathon acquired certain RM&T
                        net assets from Ashland Inc. ("Ashland") in exchange for
                        a 38 percent interest in MAP. Financial measures such as
                        revenues, income from operations and capital
                        expenditures in 2000, 1999 and 1998 include 100 percent
                        of MAP and are not comparable to prior period amounts.
                        Net income and related per share amounts for 2000, 1999
                        and 1998 are net of minority interest. For further
                        discussion of MAP, see Note 3 to the USX Consolidated
                        Financial Statements.

                            On August 11, 1998, Marathon acquired Tarragon Oil
                        and Gas Limited ("Tarragon"), a Canadian oil and gas
                        exploration and production company. The purchase price
                        included $686 million in cash payments, the assumption
                        of $345 million in debt and the issuance of Exchangeable
                        Shares of an indirect Canadian subsidiary of Marathon
                        valued at $29 million. The Exchangeable Shares are
                        exchangeable at any time on a one-for-one basis for
                        shares of USX - Marathon Group Common Stock ("Marathon
                        Stock"). On November 4, 1998, USX sold 17 million shares
                        of Marathon Stock. The proceeds to USX of $528 million
                        were used to reduce indebtedness incurred to fund the
                        Tarragon acquisition. Financial measures such as
                        revenues, income from operations and capital
                        expenditures include operations of Marathon Canada
                        Limited, formerly known as Tarragon, commencing August
                        12, 1998. For further discussion of Tarragon, see Note 3
                        to the USX Consolidated Financial Statements.

                            On November 24, 2000, USX acquired U. S. Steel
                        Kosice s.r.o. ("USSK"), which held the steel operations
                        and related assets of VSZ a.s. ("VSZ"), located in the
                        Slovak Republic. The 2000 results include USSK
                        operations after the acquisition date. For further
                        discussion of USSK, see Note 3 to the USX Consolidated
                        Financial Statements.

                            Management's Discussion and Analysis of USX
                        Consolidated Financial Statements provides certain
                        information about the Marathon and U. S. Steel Groups,
                        particularly in Management's Discussion and Analysis of
                        Operations by Group. More expansive Group information is
                        provided in Management's Discussion and Analysis of the
                        Marathon Group and U. S. Steel Group, which are included
                        in the USX 2000 Form 10-K. Management's Discussion and
                        Analysis should be read in conjunction with the USX
                        Consolidated Financial Statements and Notes to the USX
                        Consolidated Financial Statements.

                            Certain sections of Management's Discussion and
                        Analysis include forward-looking statements concerning
                        trends or events potentially affecting USX. These
                        statements typically contain words such as
                        "anticipates", "believes", "estimates", "expects" or
                        similar words indicating that future outcomes are
                        uncertain. In accordance with "safe harbor" provisions
                        of the Private Securities Litigation Reform Act of 1995,
                        these statements are accompanied by cautionary language
                        identifying important factors, though not necessarily
                        all such factors, that could cause future outcomes to
                        differ materially from those set forth in the forward-
                        looking statements. For additional risk factors
                        affecting the businesses of USX, see Supplementary Data-
                        Disclosures About Forward-Looking Statements in the USX
                        2000 Form 10-K.

                                                                            U-43


                Management's Discussion and Analysis continued


Management's Discussion and Analysis of Income

                                 Revenues and Other Income for each of the last
                        three years are summarized in the following table:



                        (Dollars in millions)                                                   2000         1999          1998
                        ---------------------------------------------------------------------------------------------------------
                                                                                                                
                        Revenues and other income/(a)/
                         Marathon Group                                                       $  33,859    $ 23,707      $ 21,623
                         U. S. Steel Group                                                        6,132       5,470         6,477
                         Eliminations                                                               (77)        (58)          (23)
                                                                                              ---------    --------      --------
                                 Total USX Corporation revenues and other income                 39,914      29,119        28,077
                        Less:
                         Consumer excise taxes on petroleum products and merchandise/(b)/         4,344       3,973         3,824
                                                                                              ---------    --------      --------
                                 Revenues and other income adjusted to exclude above item     $  35,570    $ 25,146      $ 24,253
                        ---------------------------------------------------------------------------------------------------------


                        /(a)/  Consists of revenues, dividend and investee
                               income (loss), gain on ownership change in MAP,
                               net gains (losses) on disposal of assets and
                               other income.
                        /(b)/  Included in both revenues and costs and expenses
                               for the Marathon Group and USX Consolidated,
                               resulting in no effect on income.

                                 Adjusted revenues and other income increased by
                        $10,424 million in 2000 compared with 1999, reflecting a
                        43 percent increase for the Marathon Group and a 12
                        percent increase for the U. S. Steel Group. Adjusted
                        revenues and other income increased by $893 million in
                        1999 compared with 1998, reflecting a 10 percent
                        increase for the Marathon Group, partially offset by a
                        16 percent decrease for the U. S. Steel Group. For
                        further discussion, see Management's Discussion and
                        Analysis of Operations by Group, herein.

                                 Income from operations for each of the last
                        three years are summarized in the following table:



                        (Dollars in millions)                                                   2000        1999         1998
                       ---------------------------------------------------------------------------------------------------------
                                                                                                               
                        Reportable segments
                         Marathon Group
                           Exploration & production                                            $ 1,535     $    618      $   278
                           Refining, marketing & transportation                                  1,273          611          896
                           Other energy related businesses                                          38           61           33
                                                                                               -------     --------      -------
                                 Income for reportable segments - Marathon Group                 2,846        1,290        1,207
                         U. S. Steel Group
                           Domestic Steel                                                           23           91          517
                           U. S. Steel Kosice                                                        2            -            -
                                                                                               -------     --------      -------
                                 Income for reportable segments - U. S. Steel Group                 25           91          517
                                                                                               -------     --------      -------
                                 Income for reportable segments - USX Corporation                2,871        1,381        1,724
                        Items not allocated to reportable segments:
                         Marathon Group                                                         (1,198)         423         (269)
                         U. S. Steel Group                                                          79           59           62
                                                                                               -------     --------      -------
                                 Total income from operations - USX Corporation                $ 1,752     $  1,863      $ 1,517
                       ---------------------------------------------------------------------------------------------------------


                                 Income from operations decreased $111 million
                        in 2000 compared with 1999 and increased $346 million in
                        1999 compared with 1998. The decrease in 2000, despite
                        higher income from reportable segments for the Marathon
                        Group, was primarily due to special charges at Marathon,
                        in particular a noncash adjustment related to the
                        formation of a joint venture with Kinder Morgan Energy
                        Partners, L.P. In addition, income from operations for
                        the U. S. Steel Group declined in 2000 due primarily to
                        higher costs related to energy and inefficient operating
                        levels, lower income from raw materials operations,
                        particularly coal operations, and lower sheet shipments
                        resulting from high levels of imports that continued in
                        2000. For further discussion, see Management's
                        Discussion and Analysis of Operations by Group, herein.

U-44


                        Management's Discussion and Analysis continued



                            Net interest and other financial costs for each of
                       the last three years are summarized in the following
                       table:



                       (Dollars in millions)                                                  2000         1999         1998
                       --------------------------------------------------------------------------------------------------------
                                                                                                              
                       Interest and other financial income                                   $     34     $      3     $     39
                       Interest and other financial costs                                         375          365          318
                                                                                             --------     --------     --------
                           Net interest and other financial costs                                 341          362          279
                       Less:
                        Favorable adjustment to
                          carrying value of indexed debt/(a)/                                       -          (13)         (44)
                                                                                             --------     --------     --------
                        Net interest and other financial costs
                          adjusted to exclude above item                                     $    341     $    375     $    323
                       ---------------------------------------------------------------------------------------------------------


                       /(a)/ In December 1996, USX issued $117 million in
                             aggregate principal amount of 6-3/4% Notes Due
                             February 1, 2000 ("indexed debt"), mandatorily
                             exchangeable at maturity for common stock of RTI
                             International Metals, Inc. ("RTI") or for the
                             equivalent amount of cash, at USX's option. The
                             carrying value of indexed debt was adjusted
                             quarterly to settlement value based on changes in
                             the value of RTI common stock. Any resulting
                             adjustment was charged or credited to income and
                             included in interest and other financial costs. In
                             1999, USX irrevocably deposited with a trustee the
                             RTI common stock resulting in satisfaction of USX's
                             obligation. For further information see Note 7 to
                             the USX Consolidated Financial Statements.

                             Excluding the effect of the adjustment to the
                       carrying value of indexed debt, net interest and other
                       financial costs decreased by $34 million in 2000 as
                       compared with 1999, and increased by $52 million in 1999
                       as compared with 1998. The decrease in 2000 was primarily
                       due to higher interest income. The increase in 1999 was
                       primarily due to lower interest income and increased
                       financial costs as a result of higher average debt
                       levels. For additional information, see Note 6 to the USX
                       Consolidated Financial Statements.

                             The minority interest in income of MAP, which
                       represents Ashland's 38% ownership interest, was $498
                       million in 2000, $447 million in 1999, and $249 million
                       in 1998. The increase of $51 million from 1999 to 2000
                       was primarily due to much higher RM&T segment income,
                       largely offset by the absence of the favorable 1999
                       inventory market valuation ("IMV") reserve adjustment.
                       The increase of $198 million from 1998 to 1999 was
                       primarily due to the favorable effect of the IMV reserve
                       adjustment, partially offset by lower RM&T segment
                       income.

                             The provision for income taxes was $502 million in
                       2000, compared with $349 million in 1999 and $315 million
                       in 1998. The 2000 provision included a $235 million one-
                       time, noncash deferred tax charge for the Marathon Group
                       as a result of the change in the amount and timing of
                       future foreign source income due to the exchange of its
                       interest in Sakhalin Energy Investment Company Ltd. for
                       oil and gas producing interests. The 1999 provision
                       included a $23 million favorable adjustment to deferred
                       taxes for the Marathon Group related to the outcome of a
                       United States Tax Court case. The 1998 income tax
                       provision included $33 million of favorable income tax
                       accrual adjustments relating to foreign operations. For
                       reconciliation of the federal statutory rate to total
                       provisions on income from continuing operations, see Note
                       11 to the USX Consolidated Financial Statements.

                             Extraordinary loss of $7 million, net of income tax
                       benefit, in 1999 included a $5 million loss resulting
                       from the satisfaction of the indexed debt and a $2
                       million loss for USX's share of Republic Technologies
                       International, LLC's extraordinary loss related to the
                       early extinguishment of debt. For additional information,
                       see Note 7 to the USX Consolidated Financial Statements.

                             Net income was $411 million in 2000, $698 million
                       in 1999 and $674 million in 1998. Excluding the gain on
                       change of ownership in MAP in 2000, 1999 and 1998 and
                       adjustments to the inventory market valuation reserve in
                       1999 and 1998, net income decreased by $69 million in
                       2000 compared with 1999, and decreased by $152 million in
                       1999 compared with 1998.

                                                                            U-45


                        Management's Discussion and Analysis continued

Management's Discussion and Analysis of Financial Condition, Cash Flows and
Liquidity

                            Current assets increased by $1,376 million from
                        year-end 1999, primarily reflecting increased cash and
                        cash equivalents, receivables, inventories and assets
                        held for sale. Receivables primarily increased as a
                        result of higher commodity prices. Cash and cash
                        equivalents increased primarily due to an increase in
                        cash held by certain foreign subsidiaries. Inventories
                        increased by $186 million largely due to increases at
                        the U. S. Steel Group, in particular the acquisition of
                        USSK. Assets held for sale increased mainly due to the
                        reclassification of the Yates field from property, plant
                        and equipment.

                            Current liabilities increased by $704 million from
                        year-end 1999, primarily due to an increase in accounts
                        payable reflecting higher year-end commodity prices for
                        the Marathon Group and the acquisition of USSK for the
                        U. S. Steel Group. In addition, notes payable increased
                        and, because of the reclassification of long-term debt
                        to short-term, short-term debt also increased.

                            Investments and long-term receivables decreased by
                        $436 million from year-end 1999, primarily due to the
                        exchange of Marathon's interest in Sakhalin Energy
                        Investment Company Ltd.

                            Net property, plant and equipment decreased by $695
                        million from year-end 1999, primarily due to
                        depreciation, asset impairments and sales, and
                        reclassifications to assets held for sale, partially
                        offset by property additions, including USSK.

                            Total long-term debt and notes payable increased by
                        $327 million from year-end 1999, primarily due to $325
                        million of debt related to the acquisition of USSK,
                        which is nonrecourse to USX. Debt attributed to the U.
                        S. Steel Group increased, while debt attributed to the
                        Marathon Group decreased.

                            Stockholders' equity decreased by $92 million from
                        year-end 1999 mainly reflecting net income of $411
                        million offset by dividends declared and Marathon Stock
                        repurchases of $105 million. In July 2000, the USX Board
                        of Directors authorized spending up to $450 million to
                        repurchase shares of Marathon Stock. This repurchase
                        program will continue from time to time as the
                        Corporation's financial condition and market conditions
                        warrant.

                            Net cash provided from operating activities was
                        $2,531 million in 2000, $1,936 million in 1999 and
                        $2,022 million in 1998. Cash provided from operating
                        activities in 2000 included a $500 million elective
                        contribution to a Voluntary Employee Benefit Association
                        Trust ("VEBA"), a trust established by contract in 1994
                        covering United Steelworkers of America retirees' health
                        care and life insurance benefits and a $30 million
                        elective contribution to a non-union retiree life
                        insurance trust. Cash provided from operating activities
                        in 1999 included a payment of $320 million resulting
                        from the expiration of a program to sell U. S. Steel
                        Group's accounts receivable. Excluding the effects of
                        these items, cash provided from operating activities
                        increased $805 million in 2000 compared with 1999
                        primarily due to increased cash provided from operations
                        at the Marathon Group partially offset by increased
                        income tax payments. Cash provided from operating
                        activities in 1998 included proceeds of $38 million for
                        the insurance litigation settlement pertaining to the
                        1995 Gary Works #8 blast furnace explosion and the
                        payment of $30 million for the repurchase of sold
                        accounts receivable. Excluding the effects of these
                        adjustments, cash provided from operating activities
                        increased by $242 million in 1999 compared with 1998
                        primarily due to favorable working capital changes.

                            Capital expenditures for each of the last three
                        years are summarized in the following table:



                        (Dollars in millions)                                                    2000         1999         1998
                        ---------------------------------------------------------------------------------------------------------
                                                                                                                
                        Marathon Group
                         Exploration & production
                            Domestic                                                           $    516     $    356     $    652
                            International                                                           226          388          187
                         Refining, marketing & transportation                                       656          612          410
                         Other                                                                       27           22           21
                                                                                               --------     --------     --------
                              Subtotal Marathon Group                                             1,425        1,378        1,270
                        U. S. Steel Group                                                           244          287          310
                                                                                               --------     --------     --------
                              Total USX Corporation capital expenditures                       $  1,669     $  1,665     $  1,580
                       ----------------------------------------------------------------------------------------------------------


U-46


                        Management's Discussion and Analysis  continued


                            Domestic exploration and production capital
                        expenditures for the Marathon Group in 2000 mainly
                        included the completion of the Viosca Knoll Block 786
                        (Petronius) development in the Gulf of Mexico, various
                        producing property acquisitions, and natural gas
                        developments in East Texas and other gas basins
                        throughout the western United States. International
                        exploration and production projects included the
                        completion of the Tchatamba West development, located
                        offshore Gabon, and continued oil and natural gas
                        developments in Canada. Refining, marketing and
                        transportation capital expenditures by MAP primarily
                        consisted of refinery modifications, including the
                        initiation of the delayed coker unit project at the
                        Garyville refinery, and upgrades and expansions of
                        retail marketing outlets.

                            Capital expenditures for the U. S. Steel Group in
                        2000 included exercising an early buyout option of a
                        lease for approximately half of the Gary Works No. 2
                        Slab Caster, the continued replacement of coke battery
                        thruwalls at Gary Works, installation of the remaining
                        two coilers at Gary's hot strip mill, a blast furnace
                        stove replacement at Gary Works and the continuation of
                        an upgrade to the Mon Valley cold reduction mill.

                            Capital expenditures in 2001 are expected to be
                        approximately $1.9 billion. Expenditures for the
                        Marathon Group are expected to be approximately $1.5
                        billion. Domestic exploration and production projects
                        planned for 2001 will focus on gas projects and include
                        various producing property acquisitions. Planned capital
                        expenditures in 2001 do not include the capital
                        requirements related to the acquisition of Pennaco
                        Energy, Inc. ("Pennaco"). International exploration and
                        production projects include the continued development of
                        the Foinaven area in the U.K. Atlantic Margin and
                        continued oil and natural gas developments in Canada.
                        Refining, marketing and transportation spending by MAP
                        will primarily consist of refinery improvements,
                        including the completion of the delayed coker unit
                        project at the Garyville refinery, upgrades and
                        expansions of retail marketing outlets, and expansion
                        and enhancement of logistics systems. Other Marathon
                        spending will include funds for development and
                        installation of SAP software, which is an enterprise
                        resource planning system that will allow the integration
                        of processes among business units and with outside
                        enterprises.

                            Capital expenditures for the U. S. Steel Group in
                        2001 are expected to be approximately $425 million.
                        Planned projects include exercising an early buyout
                        option of a lease for the balance of the Gary Works No.
                        2 Slab Caster, work on the No. 3 blast furnace at Mon
                        Valley Works, work on the No. 2 stove at the No. 6 blast
                        furnace at Gary Works, the completion of the replacement
                        of coke battery thruwalls at Gary Works, the completion
                        of an upgrade to the Mon Valley cold reduction mill,
                        mobile equipment purchases, systems development
                        projects, and projects at USSK, including the completion
                        of the tin mill upgrade.

                            Contract commitments to acquire property, plant and
                        equipment and long-term investments at December 31,
                        2000, totaled $663 million compared with $568 million at
                        December 31, 1999.

                            Costs incurred for the periods ended December 31,
                        2000, 1999 and 1998 relating to the development of
                        proved undeveloped oil and gas reserves, including
                        equity investees, were $316 million, $333 million, and
                        $496 million, respectively. As of December 31, 2000,
                        estimated future development costs relating to the
                        development of proved undeveloped oil and gas reserves
                        for the years 2001 through 2003 are projected to be $337
                        million, $115 million, and $97 million.

                            Investments in investees of $100 million in 2000
                        mainly reflected Marathon Group development spending for
                        the Sakhalin II project in Russia and U. S. Steel Group
                        investment in stock of VSZ in which USX now holds a 25
                        percent interest.

                            The above statements with respect to capital
                        expenditures are forward-looking statements reflecting
                        management's best estimates based on information
                        currently available. To the extent this information
                        proves to be inaccurate, the timing and levels of future
                        expenditures could differ materially from those included
                        in the forward-looking statements. Factors that could
                        cause future capital expenditures to differ materially
                        include changes in industry supply and demand, general
                        economic conditions, the availability of business
                        opportunities and levels of cash flow from operations
                        for each of the Groups. The timing of completion or cost
                        of particular capital projects could be affected by
                        unforeseen hazards such as weather conditions,
                        explosions or fires.

                                                                            U-47


                        Management's Discussion and Analysis  continued

                            Proceeds from disposal of assets were $560 million
                        in 2000, compared with $366 million in 1999 and $86
                        million in 1998. Proceeds in 2000 primarily reflected
                        Marathon's Sakhalin exchange, sales of interest in the
                        Angus/Stellaria development in the Gulf of Mexico, the
                        sale of non-core Speedway SuperAmerica stores and other
                        domestic production properties. Proceeds in 1999
                        primarily reflected the sales of Scurlock Permian LLC,
                        over 150 non-strategic domestic and international
                        production properties and Carnegie Natural Gas Company
                        and affiliated subsidiaries, all of which were
                        attributed to the Marathon Group.

                            The net change in restricted cash was a net
                        withdrawal of $3 million in 2000, compared with a net
                        deposit of $1 million in 1999 and a net withdrawal of
                        $174 million in 1998. The $174 million net withdrawal in
                        1998 was primarily the result of redeeming all of the
                        outstanding shares of USX - Delhi Group Common Stock
                        with the $195 million of net proceeds from the sale of
                        the Delhi Companies.

                            Repayments of loans and advances to investees were
                        $10 million in 2000 compared with $1 million in 1999 and
                        $71 million in 1998. In 1998, Sakhalin Energy Investment
                        Company Ltd. repaid advances made by Marathon in
                        connection with the Sakhalin II project.

                            Net cash changes related to financial obligations
                        (the net of commercial paper and revolving credit
                        arrangements, debt borrowings and repayments on the
                        Consolidated Statement of Cash Flows) decreased $4
                        million in 2000, compared with an increase of $187
                        million in 1999 and an increase of $315 million in 1998.
                        The decrease in 2000 reflects the net effects of net
                        cash provided from operating activities, net cash used
                        in investing activities, distributions to minority
                        shareholder of MAP, dividends paid and a stock
                        repurchase program for Marathon Group. The increase in
                        1999 reflects the net effects of net cash provided from
                        operating activities, net cash used in investing
                        activities, distributions to minority shareholder of MAP
                        and dividends paid. The increase in 1998 was primarily
                        the result of borrowings against revolving credit
                        agreements to fund the acquisition of Tarragon.

                            Significant additions to long-term debt for each of
                        the last three years are summarized in the following
                        table:



                        (Dollars in millions)                                                    2000         1999         1998
                       ----------------------------------------------------------------------------------------------------------
                                                                                                                
                        Aggregate principal amounts of:
                         6.65% Notes due 2006                                                 $      -     $     300     $      -
                         6.85% Notes due 2008                                                        -            -           400
                         U. S. Steel receivables facility                                            -           350            -
                         USSK loan facility/(a)/                                                    325           -             -
                         Environmental bonds and capital leases/(b)/                                 -            37          280
                                                                                              ---------    ---------     --------
                              Total                                                           $     325    $     687     $    680
                       ----------------------------------------------------------------------------------------------------------


                        /(a)/  The USSK loan facility is nonrecourse to USX.
                        /(b)/  Issued to refinance an equivalent amount of
                               environmental improvement refunding bonds.

                            In the event of a change in control of USX, debt and
                        lease obligations totaling $3,818 million at year-end
                        2000 may be declared immediately due and payable or
                        required to be collateralized. See Notes 10 and 14 to
                        the USX Consolidated Financial Statements.

                            Marathon Stock repurchased was $105 million in 2000.
                        In July 2000, the USX Board of Directors authorized
                        spending up to $450 million to repurchase shares of
                        Marathon Stock. This repurchase program will continue
                        from time to time as the Corporation's financial
                        condition and market conditions warrant.

                            Dividends paid increased $17 million in 2000
                        compared with 1999 and increased $12 million in 1999
                        compared with 1998. The increase in 2000 was due
                        primarily to a two-cents-per-share increase in the
                        quarterly Marathon Stock dividend effective with
                        dividends paid in the third quarter 2000.

                        Benefit Plan Activity

                            In 2000, USX contributed $530 million to a VEBA,
                        including a $500 million elective contribution, and $30
                        million to a non-union retiree life insurance trust. In
                        1999, USX contributed $20 million to a VEBA.

U-48


                        Management's Discussion and Analysis  continued

                        Debt and Preferred Stock Ratings

                            In May 2000, Standard & Poor's Corp. upgraded USX's
                        and Marathon's senior debt to BBB, which continues the
                        investment grade rating. At the same time, USX's
                        subordinated debt was upgraded to BBB- and preferred
                        stock was upgraded to BB+. Also in May 2000, Moody's
                        Investors Services, Inc., upgraded USX's and Marathon's
                        senior debt to the investment grade rating of Baa1,
                        USX's subordinated debt to Baa2 and USX's preferred
                        stock to baa3. Fitch IBCA Duff & Phelps currently rates
                        USX's senior notes as investment grade at BBB and USX's
                        subordinated debt as BBB-. In December 2000, Standard &
                        Poor's Corp. advised that they had put USX on "Credit
                        Watch Developing" status and Fitch IBCA, Duff & Phelps
                        advised that they had put USX on "Rating Watch-Evolving"
                        status. Both moves were in response to USX's announced
                        structure study.

                        Derivative Instruments

                            See Quantitative and Qualitative Disclosures About
                        Market Risk for discussion of derivative instruments and
                        associated market risk.

                        Liquidity

                            In December 2000, USX entered into a $1,354 million
                        five-year revolving credit agreement, terminating in
                        November 2005, and a $451 million 364-day facility,
                        which together replaced the prior $2,350 million
                        facility. At December 31, 2000, USX had $300 million of
                        borrowings against its $1,354 million long-term
                        revolving credit agreements and commercial paper
                        borrowings of $77 million. Also, USX had a short-term
                        line of credit totaling $150 million which was fully
                        drawn at December 31, 2000. There were no borrowings
                        against MAP or USSK revolving credit agreements at
                        December 31, 2000.

                            USX had a total of $1,678 million available at
                        December 31, 2000 under existing shelf registration
                        statements filed with the Securities and Exchange
                        Commission. These allow USX to offer and issue unsecured
                        debt securities, common and preferred stock and warrants
                        in one or more separate offerings on terms to be
                        determined at the time of sale.

                            USX management believes that its short-term and
                        long-term liquidity is adequate to satisfy its
                        obligations as of December 31, 2000, and to complete
                        currently authorized capital spending programs. Future
                        requirements for USX's business needs, including the
                        funding of capital expenditures, debt maturities for the
                        years 2001, 2002 and 2003, and any amounts that may
                        ultimately be paid in connection with contingencies
                        (which are discussed in Note 26 to the USX Consolidated
                        Financial Statements), are expected to be financed by a
                        combination of internally generated funds, proceeds from
                        the sale of stock, borrowings or other external
                        financing sources. However, on November 30, 2000, USX
                        announced that the USX Board of Directors had authorized
                        management to retain financial, tax and legal advisors
                        to perform an in-depth study of the corporation's
                        targeted stock structure. Until the study is complete,
                        USX management believes it will be more difficult to
                        access traditional debt and equity markets. Although USX
                        management believes that it will not be necessary to
                        access financial markets during this time frame,
                        nontraditional sources should be available to provide
                        adequate liquidity, if necessary.

                            USX management's opinion concerning liquidity and
                        USX's ability to avail itself in the future of the
                        financing options mentioned in the above forward-looking
                        statements are based on currently available information.
                        To the extent that this information proves to be
                        inaccurate, future availability of financing may be
                        adversely affected. Factors that affect the availability
                        of financing include the performance of each Group (as
                        indicated by levels of cash provided from operating
                        activities and other measures), the results of the
                        announced structure study, the state of the debt and
                        equity markets, investor perceptions of past performance
                        and expectations regarding future actions and
                        performance, the overall U.S. financial climate, and, in
                        particular, with respect to borrowings, levels of USX's
                        outstanding debt and credit ratings by rating agencies.
                        For a summary of short-term and long-term debt, see
                        Notes 13 and 14 to the USX Consolidated Financial
                        Statements.

                                                                            U-49


                        Management's Discussion and Analysis  continued

Management's Discussion and Analysis of Environmental Matters, Litigation and
Contingencies

                            USX has incurred and will continue to incur
                        substantial capital, operating and maintenance, and
                        remediation expenditures as a result of environmental
                        laws and regulations. To the extent these expenditures,
                        as with all costs, are not ultimately reflected in the
                        prices of USX's products and services, operating results
                        will be adversely affected. USX believes that domestic
                        competitors of the U. S. Steel Group and substantially
                        all the competitors of the Marathon Group are subject to
                        similar environmental laws and regulations. However, the
                        specific impact on each competitor may vary depending on
                        a number of factors, including the age and location of
                        its operating facilities, marketing areas, production
                        processes and the specific products and services it
                        provides.

                            In addition, USX expects to incur capital
                        expenditures to meet environmental standards under the
                        Slovak Republic's environmental laws for the U. S. Steel
                        Group's USSK operation.

                            The following table summarizes USX's environmental
                        expenditures for each of the last three years/(a)/:



                        (Dollars in millions)                                                    2000         1999         1998
                       ---------------------------------------------------------------------------------------------------------
                                                                                                                
                        Capital
                         Marathon Group                                                       $     73     $     46      $    83
                         U. S. Steel Group                                                          18           32           49
                                                                                              --------     --------      -------
                              Total capital                                                   $     91     $     78      $   132
                       ---------------------------------------------------------------------------------------------------------
                        Compliance
                         Operating & maintenance
                           Marathon Group                                                     $    139     $    117      $   126
                           U. S. Steel Group                                                       194          199          198
                                                                                              --------     --------      -------
                              Total operating & maintenance                                        333          316          324
                         Remediation/(b)/
                          Marathon Group                                                            30           25           10
                           U. S. Steel Group                                                        18           22           19
                                                                                              --------     --------      -------
                              Total remediation                                                     48           47           29
                              Total compliance                                                $    381     $    363      $   353
                       ---------------------------------------------------------------------------------------------------------


                        /(a)/  Amounts for the Marathon Group are calculated
                               based on American Petroleum Institute survey
                               guidelines and include 100% of MAP. Amounts for
                               the U. S. Steel Group are based on previously
                               established U.S. Department of Commerce survey
                               guidelines.
                        /(b)/  Amounts do not include noncash provisions
                               recorded for environmental remediation, but
                               include spending charged against remediation
                               reserves, net of recoveries where permissible.

                            USX's environmental capital expenditures accounted
                        for 5%, 5% and 8% of total consolidated capital
                        expenditures in 2000, 1999 and 1998, respectively.

                            USX's environmental compliance expenditures averaged
                        1% of total consolidated costs in each of 2000, 1999 and
                        1998. Remediation spending primarily reflected ongoing
                        clean-up costs for soil and groundwater contamination
                        associated with underground storage tanks and piping at
                        retail gasoline stations, and remediation activities at
                        former and present operating locations.

                            The Resource Conservation and Recovery Act ("RCRA")
                        establishes standards for the management of solid and
                        hazardous wastes. Besides affecting current waste
                        disposal practices, RCRA also addresses the
                        environmental effects of certain past waste disposal
                        operations, the recycling of wastes and the regulation
                        of storage tanks.

                            A significant portion of USX's currently identified
                        environmental remediation projects relate to the
                        remediation of former and present operating locations.
                        These projects include remediation of contaminated
                        sediments in a river that receives discharges from the
                        Gary Works and the closure of permitted hazardous and
                        non-hazardous waste landfills.

                            USX has been notified that it is a potentially
                        responsible party ("PRP") at 38 waste sites under the
                        Comprehensive Environmental Response, Compensation and
                        Liability Act ("CERCLA") as of December 31, 2000. In
                        addition, there are 23 sites where USX has received
                        information requests or

U-50


                        Management's Discussion and Analysis  continued

                        other indications that USX may be a PRP under CERCLA but
                        where sufficient information is not presently available
                        to confirm the existence of liability. There are also
                        144 additional sites, excluding retail gasoline
                        stations, where remediation is being sought under other
                        environmental statutes, both federal and state, or where
                        private parties are seeking remediation through
                        discussions or litigation. Of these sites, 15 were
                        associated with properties conveyed to MAP by Ashland
                        for which Ashland has retained liability for all costs
                        associated with remediation. At many of these sites, USX
                        is one of a number of parties involved and the total
                        cost of remediation, as well as USX's share thereof, is
                        frequently dependent upon the outcome of investigations
                        and remedial studies. USX accrues for environmental
                        remediation activities when the responsibility to
                        remediate is probable and the amount of associated costs
                        is reasonably determinable. As environmental remediation
                        matters proceed toward ultimate resolution or as
                        additional remediation obligations arise, charges in
                        excess of those previously accrued may be required. See
                        Note 26 to the USX Consolidated Financial Statements.

                            New Tier II Fuels regulations were proposed in late
                        1999. The gasoline rules, which were finalized by the
                        U.S. Environmental Protection Agency ("EPA") in February
                        2000, and the diesel fuel rule, which was finalized in
                        January 2001, require substantially reduced sulfur
                        levels. The combined capital cost to achieve compliance
                        with the gasoline and diesel regulations could amount to
                        approximately $700 million between 2003 and 2005. This
                        is a forward-looking statement and can only be a
                        broad-based estimate due to the ongoing evolution of
                        regulatory requirements. Some factors (among others)
                        that could potentially affect gasoline and diesel fuel
                        compliance costs include obtaining the necessary
                        construction and environmental permits, operating
                        considerations, and unforeseen hazards such as weather
                        conditions.

                            In October 1998, the National Enforcement
                        Investigations Center and Region V of the EPA conducted
                        a multi-media inspection of MAP's Detroit refinery.
                        Subsequently, in November 1998, Region V conducted a
                        multi-media inspection of MAP's Robinson refinery. These
                        inspections covered compliance with the Clean Air Act
                        (New Source Performance Standards, Prevention of
                        Significant Deterioration, and the National Emission
                        Standards for Hazardous Air Pollutants for Benzene), the
                        Clean Water Act (permit exceedances for the Waste Water
                        Treatment Plant), reporting obligations under the
                        Emergency Planning and Community Right to Know Act and
                        the handling of process waste. MAP has been advised, in
                        ongoing discussions with the EPA, as to certain
                        compliance issues regarding MAP's Detroit and Robinson
                        refineries. Thus far, MAP has been served with two
                        Notices of Violation ("NOV") and three Findings of
                        Violation in connection with the multi-media inspection
                        at its Detroit refinery. The Detroit notices allege
                        violations of the Michigan State Air Pollution
                        Regulations, the EPA New Source Performance Standards
                        and National Emission Standards for Hazardous Air
                        Pollutants for Benzene. On March 6, 2000, MAP received
                        its first NOV arising out of the multi-media inspection
                        of the Robinson refinery conducted in November 1998. The
                        NOV is for alleged Resource Conservation and Recovery
                        Act (hazardous waste) violations.

                            MAP has responded to information requests from the
                        EPA regarding New Source Review ("NSR") compliance at
                        its Garyville and Texas City refineries. In addition,
                        the scope of the EPA's 1998 multi-media inspections of
                        the Detroit and Robinson refineries included NSR
                        compliance. NSR requires new major stationary sources
                        and major modifications at existing major stationary
                        sources to obtain permits, perform air quality analysis
                        and install stringent air pollution control equipment at
                        affected facilities. The current EPA initiative appears
                        to target many items that the industry has historically
                        considered routine repair, replacement and maintenance
                        or other activity exempted from the NSR requirements.
                        MAP is engaged in ongoing discussions with the EPA on
                        these issues concerning all of MAP's refineries.

                            While MAP has not been notified of any formal
                        findings or violations resulting from either the
                        information requests or inspections regarding NSR
                        compliance, MAP has been informed during discussions
                        with the EPA of potential non-compliance concerns of the
                        EPA based on these inspections and other information
                        identified by the EPA. Recently, discussions with the
                        EPA have included commitment to some specific control
                        technologies and implementation schedules, but not
                        penalties. In addition, MAP anticipates that some or all
                        of the non-NSR related issues arising from the
                        multi-media inspections may also be resolved as part of
                        the current discussions with the EPA. A negotiated
                        resolution with the EPA could result in increased
                        environmental capital expenditures in future years, in
                        addition to as yet, undetermined penalties.

                                                                            U-51


                        Management's Discussion and Analysis  continued

                            During 1999 an EPA advisory panel on oxygenate use
                        in gasoline issued recommendations to the EPA, calling
                        for the improved protection of drinking water from
                        methyl tertiary butyl ether ("MTBE") impacts, a
                        substantial reduction in the use of MTBE, and action by
                        Congress to remove the oxygenate requirements for
                        reformulated gasoline under the Clean Air Act. The panel
                        reviewed public health and environmental issues that
                        have been raised by the use of MTBE in gasoline, and
                        specifically by the discovery of MTBE in water supplies.
                        State and federal environmental regulatory agencies
                        could implement the majority of the recommendations,
                        while some would require Congressional legislative
                        action. California has acted to ban MTBE use by December
                        31, 2002 and has requested a waiver from the EPA of
                        California state oxygenate requirements. In addition, a
                        number of states have passed laws which limit or require
                        the phase out of MTBE in gasoline, including states in
                        MAP's marketing area such as Michigan and Minnesota.
                        Many other states are considering bills which require
                        similar limitations or the phase out of MTBE.

                            MAP has a non-material investment in MTBE units at
                        its Robinson, Catlettsburg and Detroit refineries.
                        Approximately seven percent of MAP's refinery gasoline
                        production includes MTBE. Potential phase-outs or
                        restrictions on the use of MTBE would not be expected to
                        have a material impact on MAP and its operations,
                        although it is not possible to reach any conclusions
                        until further federal or state actions, if any, are
                        taken.

                            In October 1996, USX was notified by the Indiana
                        Department of Environmental Management ("IDEM") acting
                        as lead trustee, that IDEM and the U. S. Department of
                        the Interior had concluded a preliminary investigation
                        of potential injuries to natural resources related to
                        releases of hazardous substances from various municipal
                        and industrial sources along the east branch of the
                        Grand Calumet River and Indiana Harbor Canal. The public
                        trustees completed a pre-assessment screen pursuant to
                        federal regulations and have determined to perform an
                        NRD Assessment. USX was identified as a PRP along with
                        15 other companies owning property along the river and
                        harbor canal. USX and eight other PRPs have formed a
                        joint defense group. The trustees notified the public of
                        their plan for assessment and later adopted the plan. In
                        2000, the trustees concluded their assessment of
                        sediment injuries, which includes a technical review of
                        environmental conditions. The PRP joint defense group is
                        discussing settlement opportunities with the trustees
                        and the EPA.

                            In 1997, USS/Kobe Steel Company ("USS/Kobe"), a
                        joint venture between USX and Kobe Steel, Ltd. ("Kobe"),
                        was the subject of a multi-media audit by the EPA that
                        included an air, water and hazardous waste compliance
                        review. USS/Kobe and the EPA entered into a tolling
                        agreement pending issuance of the final audit and
                        commenced settlement negotiations in July 1999. In
                        August 1999, the steelmaking and bar producing
                        operations of USS/Kobe were combined with companies
                        controlled by Blackstone Capital Partners II to form
                        Republic Technologies International, LLC ("Republic").
                        The tubular operations of USS/Kobe were transferred to a
                        newly formed entity, Lorain Tubular Company, LLC
                        ("Lorain Tubular"), which operated as a joint venture
                        between USX and Kobe until December 31, 1999 when USX
                        purchased all of Kobe's interest in Lorain Tubular.
                        Republic and Lorain Tubular are continuing negotiations
                        with the EPA. Most of the matters raised by the EPA
                        relate to Republic's facilities; however, air discharges
                        from Lorain Tubular's #3 seamless pipe mill have also
                        been cited. Lorain Tubular will be responsible for
                        matters relating to its facilities. The final report and
                        citations from the EPA have not been issued.

                            In 1998, USX entered into a consent decree with the
                        EPA which resolved alleged violations of the Clean Water
                        Act National Pollution Discharge Elimination System
                        ("NPDES") permit at Gary Works and provides for a
                        sediment remediation project for a section of the Grand
                        Calumet River that runs through Gary Works.
                        Contemporaneously, USX entered into a consent decree
                        with the public trustees which resolves potential
                        liability for natural resource damages on the same
                        section of the Grand Calumet River. In 1999, USX paid
                        civil penalties of $2.9 million for the alleged water
                        act violations and $0.5 million in natural resource
                        damages assessment costs. In addition, USX will pay the
                        public trustees $1 million at the end of the remediation
                        project for future monitoring costs and USX is obligated
                        to purchase and restore several parcels of property that
                        have been or will be conveyed to the trustees. During
                        the negotiations leading up to the settlement with EPA,
                        capital improvements were made to upgrade plant systems
                        to comply with the NPDES requirements. The sediment
                        remediation

U-52


                        Management's Discussion and Analysis  continued

                        project is an approved final interim measure under the
                        corrective action program for Gary Works and is expected
                        to cost approximately $36.4 million over the next five
                        years. Estimated remediation and monitoring costs for
                        this project have been accrued.

                            In February 1999, the U.S. Department of Justice and
                        EPA issued a letter demanding a cash payment of
                        approximately $4 million to resolve a Finding of
                        Violation issued in 1997 alleging improper sampling of
                        benzene waste streams at Gary Coke. On September 18,
                        2000, a Consent Decree was entered which required USX to
                        pay a civil penalty of $587,000 and to replace PCB
                        transformers as a Supplemental Environmental Program at
                        a cost of approximately $2.2 million. Payment of the
                        civil penalty was made on October 13, 2000.

                            The Berks Associates/Douglassville Site ("Berks
                        Site") is situated on a 50-acre parcel located on the
                        Schuylkill River in Berks County, PA. Used oil and
                        solvent reprocessing operations were conducted on the
                        Berks Site between 1941 and 1986. In September 1997, USX
                        signed a consent decree to conduct a feasibility study
                        at the site relating to the alternative remedy. In 1999,
                        a new Record of Decision was approved by the EPA and the
                        U.S. Department of Justice. On January 19, 2001, USX
                        signed a consent decree with the EPA to remediate this
                        site.

                            In 1987, the California Department of Health
                        Services ("DHS") issued a remedial action order for the
                        GBF/Pittsburg landfill near Pittsburg, California. DHS
                        alleged that from 1972 through 1974, Pittsburg Works
                        arranged for the disposal of approximately 2.6 million
                        gallons of waste oil, sludge, caustic mud and acid,
                        which were eventually taken to this landfill for
                        disposal. In 2000, the parties reached a buyout
                        arrangement with a third party remediation firm, whereby
                        the firm agreed to take title to and remediate the site
                        and also indemnify the PRPs. This commitment was backed
                        by pollution insurance. USX's share to participate in
                        the buyout was approximately $1.1 million. Payment of
                        the USX buyout amount was made December 2000. Title to
                        the site was transferred to the remediation firm on
                        January 31, 2001.

                            New or expanded environmental requirements, which
                        could increase USX's environmental costs, may arise in
                        the future. USX intends to comply with all legal
                        requirements regarding the environment, but since many
                        of them are not fixed or presently determinable (even
                        under existing legislation) and may be affected by
                        future legislation, it is not possible to predict
                        accurately the ultimate cost of compliance, including
                        remediation costs which may be incurred and penalties
                        which may be imposed. However, based on presently
                        available information, and existing laws and regulations
                        as currently implemented, USX does not anticipate that
                        environmental compliance expenditures (including
                        operating and maintenance and remediation) will
                        materially increase in 2001. USX expects environmental
                        capital expenditures in 2001 to be approximately $120
                        million, or approximately 5% of total estimated
                        consolidated capital expenditures. Predictions beyond
                        2001 can only be broad-based estimates which have
                        varied, and will continue to vary, due to the ongoing
                        evolution of specific regulatory requirements, the
                        possible imposition of more stringent requirements and
                        the availability of new technologies, among other
                        matters. Based upon currently identified projects, USX
                        anticipates that environmental capital expenditures in
                        2002 will total approximately $143 million; however,
                        actual expenditures may vary as the number and scope of
                        environmental projects are revised as a result of
                        improved technology or changes in regulatory
                        requirements, and could increase if additional projects
                        are identified or additional requirements are imposed.

                            USX is the subject of, or party to, a number of
                        pending or threatened legal actions, contingencies and
                        commitments involving a variety of matters. The ultimate
                        resolution of these contingencies could, individually or
                        in the aggregate, be material to the consolidated
                        financial statements. However, management believes that
                        USX will remain a viable and competitive enterprise even
                        though it is possible that these contingencies could be
                        resolved unfavorably.

                        Outlook

                            For Outlook, see Management's Discussion and
                        Analysis for the Marathon Group and the U. S. Steel
                        Group, herein.

                                                                            U-53


                        Management's Discussion and Analysis  continued

                        Accounting Standards

                            In the fourth quarter of 2000, USX adopted the
                        following accounting pronouncements primarily related to
                        the classification of items in the financial statements.
                        The adoption of these new pronouncements had no net
                        effect on the financial position or results of
                        operations of USX, although they required
                        reclassifications of certain amounts in the financial
                        statements, including all prior periods presented.

                            .  In December 1999, the Securities and Exchange
                               Commission ("SEC") issued Staff Accounting
                               Bulletin No. 101 ("SAB 101") "Revenue
                               Recognition in Financial Statements," which
                               summarizes the SEC staff's interpretations of
                               generally accepted accounting principles related
                               to revenue recognition and classification.

                            .  In 2000, the Emerging Issues Task Force of the
                               Financial Accounting Standards Board ("EITF")
                               issued EITF consensus No. 99-19 "Reporting
                               Revenue Gross as a Principal versus Net as an
                               Agent," which addresses whether certain items
                               should be reported as a reduction of revenue or
                               as a component of both revenues and cost of
                               revenues, and EITF Consensus No. 00-10
                               "Accounting for Shipping and Handling Fees and
                               Costs," which addresses the classification of
                               costs incurred for shipping goods to customers.

                            .  In September 2000, the Financial Accounting
                               Standards Board issued Statement of Financial
                               Accounting Standards No. 140, "Accounting for
                               Transfers and Servicing of Financial Assets and
                               Extinguishments of Liabilities" ("SFAS 140").
                               SFAS 140 revises the standards for accounting for
                               securitizations and other transfers of financial
                               assets and collateral and requires certain
                               disclosures. USX adopted certain recognition
                               and reclassification provisions of SFAS 140,
                               which were effective for fiscal years ending
                               after December 15, 2000. The remaining provisions
                               of SFAS 140 are effective after March 31, 2001.

                            In June 1998, the Financial Accounting Standards
                        Board issued Statement of Financial Accounting Standards
                        No. 133, "Accounting for Derivative Instruments and
                        Hedging Activities" ("SFAS No. 133"), which later was
                        amended by SFAS Nos. 137 and 138. This Standard requires
                        recognition of all derivatives as either assets or
                        liabilities at fair value. Changes in fair value will be
                        reflected in either current period net income or other
                        comprehensive income, depending on the designation of
                        the derivative instrument. USX may elect not to
                        designate a derivative instrument as a hedge even if the
                        strategy would be expected to qualify for hedge
                        accounting treatment. The adoption of SFAS No. 133 will
                        change the timing of recognition for derivative gains
                        and losses as compared to previous accounting standards.

                            USX will adopt the Standard effective January 1,
                        2001. The transition adjustment resulting from adoption
                        of SFAS No. 133 will be reported as a cumulative effect
                        of a change in accounting principle. The unfavorable
                        cumulative effect on net income, net of tax, is expected
                        to approximate $9 million. The unfavorable cumulative
                        effect on other comprehensive income, net of tax, will
                        approximate $7 million. The amounts reported as other
                        comprehensive income will be reflected in net income
                        when the anticipated physical transactions are
                        consummated. It is not possible to estimate the effect
                        that this Standard will have on future results of
                        operations.


Management's Discussion and Analysis by Group

                  The Marathon Group

                            The Marathon Group includes Marathon Oil Company
                        ("Marathon") and certain other subsidiaries of USX
                        Corporation ("USX"), which are engaged in worldwide
                        exploration and production of crude oil and natural gas;
                        domestic refining, marketing and transportation of
                        petroleum products primarily through Marathon Ashland
                        Petroleum LLC ("MAP"), owned 62 percent by Marathon; and
                        other energy related businesses. The Management's
                        Discussion and Analysis should be read in conjunction
                        with the Marathon Group's Financial Statements and Notes
                        to Financial Statements.

                                                                            U-54


                        Management's Discussion and Analysis  continued


                            The Marathon Group's 2000 financial performance was
                        primarily affected by the strong recovery in worldwide
                        liquid hydrocarbon and natural gas prices and stronger
                        refining margins. During 2000, Marathon focused on the
                        acquisition of assets with a strong strategic fit, the
                        disposal of non-core properties, and workforce
                        reductions through a voluntary early retirement program.

                            Revenues and Other Income for each of the last three
                        years are summarized in the following table:



                        (Dollars in millions)                                                 2000          1999           1998
                       --------------------------------------------------------------------------------------------------------
                                                                                                               
                        Exploration & production ("E&P")                                  $   4,694     $    3,105      $  2,090
                        Refining, marketing & transportation ("RM&T")/(a)/                   28,849         20,076        19,080
                        Other energy related businesses/(b/                                   1,684            834           355
                                                                                          ---------     ----------      --------
                           Revenues and other income of reportable segments                  35,227         24,015        21,525
                        Revenues and other income not allocated to segments:
                         Joint venture formation charges/(c)/                                  (931)             -             -
                         Gain on ownership change in MAP                                         12             17           245
                         Other/d)/                                                              124            (36)           24
                        Elimination of intersegment revenues                                   (573)          (289)         (171)
                                                                                          ---------     ----------      --------
                           Total Group revenues and other income                          $  33,859     $   23,707      $ 21,623
                                                                                          =========     ==========      ========


                            Items included in both revenues and costs and
                        expenses, resulting in no effect on income:


                                                                                                               
                        Consumer excise taxes on petroleum
                         products and merchandise                                         $   4,344     $    3,973      $  3,824
                       -----------------------------------------------------------------------------------------------------------


                        /(a)/  Amounts include 100 percent of MAP.
                        /(b)/  Includes domestic natural gas and crude oil
                               marketing and transportation, and power
                               generation.
                        /(c)/  Represents a pretax charge related to the joint
                               venture formation between Marathon and Kinder
                               Morgan Energy Partners, L.P.
                        /(d)/  Represents net gains/(losses) on certain asset
                               sales.

                            E&P segment revenues increased by $1,589 million in
                        2000 from 1999 following an increase of $1,015 million
                        in 1999 from 1998. The increase in 2000 was primarily
                        due to higher worldwide liquid hydrocarbon and natural
                        gas prices, partially offset by lower domestic liquid
                        hydrocarbon and worldwide natural gas production. The
                        increase in 1999 was primarily due to higher worldwide
                        liquid hydrocarbon prices, increased domestic liquid
                        hydrocarbon production and higher E&P crude oil buy/sell
                        volumes.

                            RM&T segment revenues increased by $8,773 million in
                        2000 from 1999 following an increase of $996 million in
                        1999 from 1998. The increase in 2000 primarily reflected
                        higher refined product prices and increased refined
                        product sales volumes. The increase in 1999 was mainly
                        due to higher refined product prices, increased volumes
                        of refined product sales and higher merchandise sales,
                        partially offset by reduced crude oil sales revenues
                        following the sale of Scurlock Permian LLC.

                            Other energy related businesses segment revenues
                        increased by $850 million in 2000 from 1999 following an
                        increase of $479 million in 1999 from 1998. The increase
                        in 2000 reflected higher natural gas and crude oil
                        resale activity accompanied by higher crude oil and
                        natural gas prices. The increase in 1999 was primarily
                        due to increased crude oil and natural gas purchase and
                        resale activity.

                            For additional discussion of revenues, see Note 10
                        to the Marathon Group Financial Statements.

                                                                            U-55


                        Management's Discussion and Analysis continued

                            Income from operations for each of the last three
                            years is summarized in the following table:



                        (Dollars in millions)                                                2000          1999           1998
                        --------------------------------------------------------------------------------------------------------
                                                                                                              
                        E&P
                         Domestic                                                         $   1,115      $     494     $     190
                         International                                                          420            124            88
                                                                                          ---------      ---------     ---------
                           Income of E&P reportable segment                                   1,535            618           278
                        RM&T/(a)/                                                             1,273            611           896
                        Other energy related businesses                                          38             61            33
                                                                                          ---------      ---------     ---------
                              Income for reportable segments                                  2,846          1,290         1,207
                        Items not allocated to reportable segments:
                           Joint venture formation charges/(b)/                                (931)             -             -
                           Administrative expenses/(c)/                                        (136)          (108)         (106)
                           IMV reserve adjustment/(d)/                                            -            551          (267)
                           Gain on ownership change & transition charges - MAP/(e)/              12             17           223
                           Impairment of oil and gas properties, assets held for sale,
                              and gas contract settlement/(f)/                                 (197)           (16)         (119)
                           Gain/(loss) on disposal of assets/(g)/                               124            (36)            -
                           Reorganization charges including pension settlement
                              (loss)/gain & benefit accruals/(h)/                               (70)            15             -
                                                                                          ---------      ---------     ---------
                              Total income from operations                                $   1,648      $   1,713     $     938
                        --------------------------------------------------------------------------------------------------------

                        /(a)/  Amounts include 100 percent of MAP.
                        /(b)/  Represents a pretax charge related to the joint
                               venture formation between Marathon and Kinder
                               Morgan Energy Partners, L.P.
                        /(c)/  Includes the portion of the Marathon Group's
                               administrative costs not charged to the operating
                               segments and the portion of USX corporate general
                               and administrative costs allocated to the
                               Marathon Group.
                        /(d)/  The inventory market valuation ("IMV") reserve
                               reflects the extent to which the recorded LIFO
                               cost basis of crude oil and refined products
                               inventories exceeds net realizable value. For
                               additional discussion of the IMV, see Note 20 to
                               the Marathon Group Financial Statements.
                        /(e)/  The gain on ownership change and one-time
                               transition charges in 1998 relate to the
                               formation of MAP. For additional discussion of
                               the gain on ownership change in MAP, see Note 5
                               to the Marathon Group Financial Statements.
                        /(f)/  Represents in 2000, an impairment of certain oil
                               and gas properties, primarily in Canada, and
                               assets held for sale. Represents in 1999, an
                               impairment of certain domestic properties.
                               Represents in 1998, a write-off of certain non-
                               revenue producing international investments and
                               several exploratory wells which had encountered
                               hydrocarbons but had been suspended pending
                               further evaluation. It also includes in 1998 a
                               gain from the resolution of a contract dispute
                               with a purchaser of Marathon's natural gas
                               production from certain domestic properties.
                        /(g)/  The net gain in 2000 represents a gain on the
                               disposition of Angus/Stellaria, a gain on the
                               Sakhalin exchange, a gain on the sale of Speedway
                               SuperAmerica LLC ("SSA") non-core stores, and a
                               loss on the sale of the Howard Glasscock field.
                               The net loss in 1999 represents a loss on the
                               sale of Scurlock Permian LLC, certain domestic
                               production properties, Carnegie Natural Gas
                               Company and affiliated subsidiaries and a gain on
                               certain Egyptian properties.
                        /(h)/  Amounts in 2000 and 1999 represent pension
                               settlement gains/(losses) and various benefit
                               accruals resulting from retirement plan
                               settlements, the voluntary early retirement
                               program, and reorganization charges.

U-56


                        Management's Discussion and Analysis continued

                           Income for reportable segments increased by $1,556
                        million in 2000 from 1999, mainly due to higher
                        worldwide liquid hydrocarbon and natural gas prices, and
                        higher refined product margins, partially offset by
                        decreased natural gas volumes. Income for reportable
                        segments increased by $83 million in 1999 from 1998,
                        mainly due to higher worldwide liquid hydrocarbon
                        prices, partially offset by lower refined product
                        margins. Income from operations includes 100 percent of
                        MAP beginning in 1998, and results from Marathon Canada
                        Limited (formerly known as Tarragon) commencing August
                        12, 1998.



                                                              Average Volumes and Selling Prices
                                                                                             2000          1999           1998
                        ---------------------------------------------------------------------------------------------------------
                                                                                                               
                        (thousands of barrels per day)
                        Net liquids production/(a)/  - U.S.                                      131            145           135
                                                     - International/(b)/                         65             62            61
                                                                                           ---------      ---------     ---------
                                                     - Total consolidated                        196            207           196
                                                     - Equity investees/(c)/                      11              1             _
                                                                                           ---------      ---------     ---------
                                                     - Worldwide                                 207            208           196
                        (millions of cubic feet per day)
                        Net natural gas production   - U.S.                                      731            755           744
                                                     - International - equity                    470            489           441
                                                     - International - other/(d)/                 11             16            23
                                                                                           ---------      ---------     ---------
                                                     - Total consolidated                      1,212          1,260         1,208
                                                     - Equity investee/(e)/                       29             36            33
                                                                                           ---------      ---------     ---------
                                                     - Worldwide                               1,241          1,296         1,241
                        ---------------------------------------------------------------------------------------------------------
                        (dollars per barrel)
                        Liquid hydrocarbons/(a)(f)/  - U.S.                                $   25.11      $   15.44     $   10.42
                                                     - International                           26.54          16.90         12.24
                        (dollars per mcf)
                        Natural gas/(f)/             - U.S.                               $     3.30      $    1.90     $    1.79
                                                     - International - equity                   2.76           1.90          1.94
                        (thousands of barrels per day)
                        Refined products sold/(g)/                                             1,306          1,251         1,198
                           Matching buy/sell volumes included in above                            52             45            39
                        ---------------------------------------------------------------------------------------------------------

                        /(a)/   Includes crude oil, condensate and natural gas
                                liquids.
                        /(b)/   Represents equity tanker liftings, truck
                                deliveries and direct deliveries.
                        /(c)/   Represents Marathon's equity interest in
                                Sakhalin Energy Investment Company Ltd.
                                ("Sakhalin Energy") and CLAM Petroleum B.V.
                                ("CLAM") for 2000 and 1999.
                        /(d)/   Represents gas acquired for injection and
                                subsequent resale.
                        /(e)/   Represents Marathon's equity interest in CLAM.
                        /(f)/   Prices exclude gains/losses from hedging
                                activities, equity investees and purchase/resale
                                gas.
                        /(g)/   Refined products sold and matching buy/sell
                                volumes include 100 percent of MAP.

                           Domestic E&P income increased by $621 million in 2000
                        from 1999 following an increase of $304 million in 1999
                        from 1998. The increase in 2000 was primarily due to
                        higher liquid hydrocarbon and natural gas prices,
                        partially offset by lower liquid hydrocarbon and natural
                        gas volumes due to natural field declines and asset
                        sales, and derivative losses from other than trading
                        activities.

                           The increase in 1999 was primarily due to higher
                        liquid hydrocarbon and natural gas prices, increased
                        liquid hydrocarbon volumes resulting from new production
                        in the Gulf of Mexico and lower exploration expense.

                           International E&P income increased by $296 million in
                        2000 from 1999 following an increase of $36 million in
                        1999 from 1998. The increase in 2000 was mainly due to
                        higher liquid hydrocarbon and natural gas prices, higher
                        liquid hydrocarbon liftings, primarily in Russia and
                        Gabon, and lower dry well expense, partially offset by
                        lower natural gas volumes.

                           The increase in 1999 was primarily due to higher
                        liquid hydrocarbon prices, partially offset by lower
                        liquid hydrocarbon and natural gas production in Europe
                        and higher exploration expense.

                                                                            U-57


                        Management's Discussion and Analysis continued

                            RM&T segment income increased by $662 million in
                        2000 from 1999 following a decrease of $285 million in
                        1999 from 1998. The increase in 2000 was primarily due
                        to higher refined product margins, partially offset by
                        higher operating expenses for SSA, higher administrative
                        expenses including increased variable pay plan costs,
                        and higher transportation costs.

                            The decrease in 1999 was primarily due to lower
                        refined product margins, partially offset by recognized
                        mark-to-market derivative gains, increased refined
                        product sales volumes, higher merchandise sales at SSA
                        and the realization of additional operating efficiencies
                        as a result of forming MAP.

                            Other energy related businesses segment income
                        decreased by $23 million in 2000 from 1999 following an
                        increase of $28 million in 1999 from 1998. The decrease
                        in 2000 was primarily a result of derivative losses from
                        other than trading activities and lower equity earnings
                        as a result of decreased pipeline throughput. The
                        increase in 1999 was primarily due to higher equity
                        earnings as a result of increased pipeline throughput
                        and a reversal of abandonment accruals of $10 million in
                        1999.

                            Items not allocated to reportable segments: IMV
                        reserve adjustment - When U. S. Steel Corporation
                        acquired Marathon Oil Company in March 1982, crude oil
                        and refined product prices were at historically high
                        levels. In applying the purchase method of accounting,
                        the Marathon Group's crude oil and refined product
                        inventories were revalued by reference to current prices
                        at the time of acquisition, and this became the new LIFO
                        cost basis of the inventories. Generally accepted
                        accounting principles require that inventories be
                        carried at lower of cost or market. Accordingly, the
                        Marathon Group has established an IMV reserve to reduce
                        the cost basis of its inventories to net realizable
                        value. Quarterly adjustments to the IMV reserve result
                        in noncash charges or credits to income from operations.

                            When Marathon acquired the crude oil and refined
                        product inventories associated with Ashland's RM&T
                        operations on January 1, 1998, the Marathon Group
                        established a new LIFO cost basis for those inventories.
                        The acquisition cost of these inventories lowered the
                        overall average cost of the Marathon Group's combined
                        RM&T inventories. As a result, the price threshold at
                        which an IMV reserve will be recorded was also lowered.

                            These adjustments affect the comparability of
                        financial results from period to period as well as
                        comparisons with other energy companies, many of which
                        do not have such adjustments. Therefore, the Marathon
                        Group reports separately the effects of the IMV reserve
                        adjustments on financial results. In management's
                        opinion, the effects of such adjustments should be
                        considered separately when evaluating operating
                        performance.

                            In 1999, the IMV reserve adjustment resulted in a
                        credit to income from operations of $551 million
                        compared to a charge of $267 million in 1998, or a
                        change of $818 million. The favorable 1999 IMV reserve
                        adjustment, which is almost entirely recorded by MAP,
                        was primarily due to the significant increase in refined
                        product prices experienced during 1999. For additional
                        discussion of the IMV reserve, see Note 20 to the
                        Marathon Group Financial Statements.

                            Joint venture formation charges represent a pretax
                        charge of $931 million in 2000 related to the joint
                        venture formation between Marathon and Kinder Morgan
                        Energy Partners, L.P. The formation of the joint venture
                        included contribution of interests in the Yates and
                        SACROC assets. Marathon holds an 85 percent economic
                        interest in the combined entity which commenced
                        operations in January 2001.

                            Impairment of oil and gas properties, assets held
                        for sale, and gas contract settlement includes in 2000,
                        the impairments of certain oil and gas properties
                        primarily in Canada and assets held for sale totaling
                        $197 million. In 1999, the $16 million charge relates to
                        the impairment of certain domestic properties. In 1998,
                        the $119 million charge relates to a write-off of
                        certain non-revenue producing international investments
                        and several exploratory wells, partially offset by a
                        gain from the resolution of a contract dispute with a
                        purchaser of Marathon's natural gas production from
                        certain domestic properties.


U-58


                        Management's Discussion and Analysis continued

                            Gain/(loss) on disposal of assets represents in 2000
                        a net gain on the sale of Marathon's interest in the
                        Angus/Stellaria development in the Gulf of Mexico, a
                        gain on the Sakhalin exchange, a loss on the sale of the
                        Howard Glasscock Field, and a gain on the sale of
                        non-core SSA stores. In 1999, the net loss represents
                        losses on the sale of Scurlock Permian LLC, certain
                        domestic production properties, Carnegie Natural Gas
                        Company and affiliated subsidiaries and a gain on
                        certain Egyptian properties.

                            Reorganization charges including pension settlement
                        (loss)/gain and benefit accruals represent charges
                        related to a reorganization program initiated by
                        Marathon for its upstream business during 2000.

                        Outlook for 2001 - Marathon Group

                            This outlook is as of the original filing date of
                        March 12, 2001. For an updated outlook, see subsequent
                        filings with the U.S. Securities and Exchange
                        Commission.

                            The outlook regarding the results of operations for
                        the Marathon Group's upstream segment is largely
                        dependent upon future prices and volumes of liquid
                        hydrocarbons and natural gas. Prices have historically
                        been volatile and have frequently been affected by
                        unpredictable changes in supply and demand resulting
                        from fluctuations in worldwide economic activity and
                        political developments in the world's major oil and gas
                        producing and consuming areas. Any significant decline
                        in prices could have a material adverse effect on the
                        Marathon Group's results of operations. A prolonged
                        decline in such prices could also adversely affect the
                        quantity of crude oil and natural gas reserves that can
                        be economically produced and the amount of capital
                        available for exploration and development.

                            At year-end 2000, Marathon revised its estimate of
                        proved developed and undeveloped oil and gas reserves
                        downward by 167 million barrels of oil equivalent
                        ("BOE"). These revisions were principally in Canada, the
                        North Sea and United States and are the result of
                        production performance and disappointing drilling
                        results.

                            BOE is a combined measure of worldwide liquid
                        hydrocarbon and natural gas production, measured in
                        barrels per day and cubic feet per day, respectively.
                        For purposes of determining BOE, natural gas volumes are
                        converted to approximate liquid hydrocarbon barrels by
                        dividing the natural gas volumes expressed in thousands
                        of cubic feet ("mcf") by 6. The liquid hydrocarbon
                        volume is added to the barrel equivalent of gas volume
                        to obtain BOE. Marathon intends to disclose total
                        production estimates on a BOE basis from this point
                        forward.

                            In 2001, worldwide production is expected to average
                        430,000 BOE per day, split evenly between liquid
                        hydrocarbons and natural gas, including production from
                        Marathon's share of equity investees and future
                        acquisitions.

                            On December 28, 2000, Marathon signed a definitive
                        agreement to form a joint venture with Kinder Morgan
                        Energy Partners, L.P., which commenced operations in
                        January 2001. The formation of the joint venture
                        included contribution of interests in the Yates and
                        SACROC assets. This transaction will allow Marathon to
                        expand its interests in the Permian Basin and will
                        improve access to materials for use in enhanced recovery
                        techniques in the Yates Field. Marathon holds an 85
                        percent economic interest in the combined entity, which
                        will be accounted for under the equity method of
                        accounting.

                            On December 22, 2000,  Marathon announced its plans
                        to acquire Pennaco. This acquisition will enhance
                        Marathon's presence in a core area, the North American
                        gas market, and will provide a significant new reserve
                        base that can be developed. The tender offer expired on
                        February 5, 2001 at 12:00 midnight, Eastern time.
                        Marathon quied approximately 17.6 million shares of
                        Pennaco common stock which were validly tendered and not
                        withdrawn in the offer, representing approximately 87
                        percent of the outstanding Pennaco shares.

                            Marathon plans to acquire the remaining Pennaco
                        shares through a merger in which each share of Pennaco
                        common stock not purchased in the offer and not held by
                        stockholders who have properly exercised dissenters
                        rights under Delaware law will be converted into the
                        right to receive the tender offer price in cash, without
                        interest.

                                                                            U-59


                        Management's Discussion and Analysis continued

                            Marathon plans to drill six deepwater Gulf of Mexico
                        exploratory wells in 2001. To support this increased
                        drilling activity, Marathon has contracted two new
                        deepwater rigs, capable of drilling in water depths
                        beyond 6,500 feet.

                            Other major upstream projects, which are currently
                        underway or under evaluation and are expected to improve
                        future income streams, include the Mississippi Canyon
                        Block 348 in the Gulf of Mexico and various North
                        American natural gas fields. Also, Marathon expects
                        continued development in the Foinaven area in the U.K.
                        Atlantic Margin. Marathon acquired an interest in this
                        location through the exchange of its Sakhalin interests
                        with Shell Oil in the fourth quarter of 2000.

                            Marathon E&P is currently on target for achieving
                        $150 million in annual repeatable pre-tax operating
                        efficiencies by year-end 2001. Marathon initiated a
                        reorganization program for its upstream business units
                        which will contribute to an overall workforce reduction
                        of 24% compared to 1999 levels. In addition, regional
                        production offices in Lafayette, Louisiana and Tyler,
                        Texas have been closed along with the Petroleum
                        Technology Center in Littleton, Colorado.

                            The above discussion includes forward-looking
                        statements with respect to 2001 worldwide liquid
                        hydrocarbon production and natural gas volumes, the
                        acquisition of Pennaco, commencement of upstream
                        projects, and the Gulf of Mexico drilling program. Some
                        factors that could potentially affect worldwide liquid
                        hydrocarbon production/gas volumes, upstream projects,
                        and the drilling program include: pricing, worldwide
                        supply and demand for petroleum products, amount of
                        capital available for exploration and development,
                        regulatory constraints, reserve estimates, reserve
                        replacement rates, production decline rates of mature
                        fields, timing of commencing production from new wells,
                        timing and results of future development drilling,
                        drilling rig availability, the completion of the merger
                        with Pennaco, future acquisitions of producing
                        properties, and other geological, operating and economic
                        considerations. In addition, development of new
                        production properties in countries outside the United
                        States may require protracted negotiations with host
                        governments and is frequently subject to political
                        considerations, such as tax regulations, which could
                        adversely affect the timing and economics of projects. A
                        factor that could affect the Pennaco acquisition is
                        successful completion of the merger. These factors
                        (among others) could cause actual results to differ
                        materially from those set forth in the forward-looking
                        statements.

                            Downstream income of the Marathon Group is largely
                        dependent upon refined product margins, which reflect
                        the difference between the selling prices of refined
                        products and the cost of raw materials refined and
                        manufacturing costs. Refined product margins have been
                        historically volatile and vary with the level of
                        economic activity in the various marketing areas, the
                        regulatory climate, crude oil costs, manufacturing
                        costs, logistical limitations and the available supply
                        of crude oil and refined products.

                            In 2000, MAP, CMS Energy Corporation, and TEPPCO
                        Partners, L.P. formed a limited liability company with
                        equal ownership to operate an interstate refined
                        petroleum products pipeline extending from the U.S. Gulf
                        of Mexico to the Midwest. The new company plans to build
                        a 74-mile, 24-inch diameter pipeline connecting TEPPCO's
                        facility in Beaumont, Texas, with an existing 720-mile,
                        26-inch diameter pipeline extending from Longville,
                        Louisiana to Bourbon, Illinois. In addition, a two
                        million barrel terminal storage facility will be
                        constructed. The system will be called Centennial
                        Pipeline and will connect with existing MAP
                        transportation assets and other common carrier lines.
                        Construction is expected to be completed in the fourth
                        quarter of 2001.

                            A MAP subsidiary, Ohio River Pipe Line LLC ("ORPL"),
                        plans to build a pipeline from Kenova, West Virginia to
                        Columbus, Ohio. ORPL is a common carrier pipeline
                        company and the pipeline will be an interstate common
                        carrier pipeline. The pipeline is expected to initially
                        move about 50,000 bpd of refined petroleum into the
                        central Ohio region. The pipeline is currently expected
                        to be operational in mid-2002. The startup of this
                        pipeline is largely dependent on obtaining the final
                        regulatory approvals, obtaining the necessary
                        rights-of-way, of which approximately 95 percent have
                        been obtained to date, and completion of construction.
                        ORPL is still negotiating with a few landowners to
                        obtain the remaining rights-of-way. Where necessary,
                        ORPL has filed condemnation actions to acquire some
                        rights-of-way. These actions are at various stages of
                        litigation and appeal with several recent decisions
                        supporting ORPL's use of eminent domain.

U-60


                        Management's Discussion and Analysis  continued

                            MAP is constructing a delayed coker unit at its
                        Garyville, Louisiana refinery. This unit will allow for
                        the use of heavier, lower cost crude and reduce the
                        production of heavy fuel oil. To supply this new unit,
                        MAP reached an agreement with P.M.I. Comercio
                        Internacional, S.A. de C.V., (PMI), an affiliate of
                        Petroleos Mexicanos, (PEMEX), to purchase approximately
                        90,000 bpd of heavy Mayan crude oil. This is a
                        multi-year contract, which will begin upon completion of
                        the delayed coker unit which is scheduled in the fall of
                        2001. In addition, a project to increase light product
                        output is underway at MAP's Robinson, Illinois refinery
                        and is expected to be completed in the second quarter of
                        2001.

                            MAP initiated a program for 2000 to dispose of
                        approximately 270 non-core SSA retail outlets in the
                        Midwest and Southeast. At the end of this program
                        through December 31, 2000, 159 stores, which comprise
                        about 7 percent of MAP's owned and operated SSA retail
                        network, had been sold. MAP will continue to sell
                        additional SSA stores as part of its ongoing store
                        development process.

                            The above discussion includes forward-looking
                        statements with respect to pipeline and refinery
                        improvement projects. Some factors that could
                        potentially cause actual results to differ materially
                        from present expectations include the price of petroleum
                        products, levels of cash flow from operations, obtaining
                        the necessary construction and environmental permits,
                        unforeseen hazards such as weather conditions, obtaining
                        the necessary rights-of-way, outcome of pending
                        litigation, and regulatory approval constraints. These
                        factors (among others) could cause actual results to
                        differ materially from those set forth in the forward-
                        looking statements.

                  The U. S. Steel Group

                            The U. S. Steel Group, through its Domestic Steel
                        segment, is engaged in the production and sale of steel
                        mill products, coke, and taconite pellets; the
                        management of mineral resources; coal mining; real
                        estate development; and engineering and consulting
                        services and, through its U. S. Steel Kosice ("USSK")
                        segment, primarily located in the Slovak Republic, in
                        the production and sale of steel mill products and coke
                        for the central European market. Certain business
                        activities are conducted through joint ventures and
                        partially owned companies, such as USS-POSCO Industries
                        ("USS-POSCO"), PRO-TEC Coating Company ("PRO-TEC"),
                        Transtar, Inc. ("Transtar"), Clairton 1314B Partnership,
                        Republic Technologies International, LLC ("Republic")
                        and Rannila Kosice s.r.o. Management's Discussion and
                        Analysis should be read in conjunction with the U. S.
                        Steel Group's Financial Statements and Notes to
                        Financial Statements.

                            Revenues and Other Income for each of the last three
                        years are summarized in the following table:



                        (Dollars in millions)                                                   2000         1999         1998
                        ---------------------------------------------------------------------------------------------------------
                                                                                                                
                        Revenues by product:
                         Sheet and semi-finished steel products                               $  3,288      $ 3,433      $ 3,598
                         Tubular, plate, and tin mill products                                   1,731        1,140        1,546
                         Raw materials (coal, coke and iron ore)                                   626          549          744
                         Other/(a)/                                                                445          414          490
                        Income (loss) from investees                                                (8)         (89)          46
                        Net gains on disposal of assets                                             46           21           54
                        Other income (loss)                                                          4            2           (1)
                                                                                              ---------     --------     --------
                           Total revenues and other income                                    $  6,132      $ 5,470      $ 6,477
                        ---------------------------------------------------------------------------------------------------------


                        /(a)/ Includes revenue from the sale of steel production
                              by-products, real estate development, resource
                              management, and engineering and consulting
                              services.

                            Total revenues and other income increased by $662
                        million in 2000 from 1999 primarily due to the
                        consolidation of Lorain Tubular Company, LLC, ("Lorain
                        Tubular") effective January 1, 2000, higher average
                        realized prices, particularly tubular product prices,
                        and lower losses from investees, which, in 1999,
                        included a $47 million charge for the impairment of
                        U. S. Steel's previous investment in USS/Kobe Steel
                        Company and costs related to the formation of Republic.
                        Total revenues and other income in 1999 decreased by
                        $1,007 million from 1998 primarily due to lower average
                        realized prices and lower income from investees.

                                                                            U-61


                        Management's Discussion and Analysis  continued

                            Income from operations for the U. S. Steel Group for
                        the last three years was:



                        (Dollars in millions)                                                   2000         1999         1998
                        ----------------------------------------------------------------------------------------------------------
                                                                                                                 
                        Segment income for Domestic Steel/(a)/                                 $    23      $    91       $  517
                        Segment income for U. S. Steel Kosice/(b)/                                   2            -            -
                                                                                               --------     --------      -------
                              Income for reportable segments                                   $    25      $    91       $  517
                        Items not allocated to segments:
                         Net pension credits                                                       266          228          186
                         Administrative expenses                                                   (25)         (17)         (24)
                         Costs related to former business activities/(c)/                          (91)         (83)        (100)
                         Asset impairments - Coal                                                  (71)           -            -
                         Impairment of USX's investment in USS/Kobe and costs
                           related to formation of Republic                                          -          (47)           -
                         Loss on investment in RTI stock used to satisfy indexed
                           debt obligations/(d)/                                                     -          (22)           -
                                                                                               --------     --------      -------
                              Total income from operations                                     $   104      $   150       $  579
                        ----------------------------------------------------------------------------------------------------------


                        /(a)/ Includes income from the sale and domestic
                              production of steel mill products, coke and
                              taconite pellets; the management of mineral
                              resources; coal mining; real estate development
                              and management; and engineering and consulting
                              services.
                        /(b)/ Includes the sale and production of steel products
                              from facilities primarily located in the Slovak
                              Republic commencing November 24, 2000. For further
                              details, see Note 5 to the U. S. Steel Group
                              Financial Statements.
                        /(c)/ Primarily represents postretirement costs other
                              than pension (OPEB costs) related to all retirees
                              prior to January 1, 1987, and related to former
                              employees and retirees from the businesses sold or
                              closed after January 1, 1987. Also includes
                              certain other expenses (primarily litigation and
                              environmental remediation costs) associated to
                              lines of business in which USX is no longer
                              engaged as a result of sale or closure.
                        /(d)/ For further details, see Note 6 to the U. S. Steel
                              Group Financial Statements.

                        Segment income for Domestic Steel

                            Domestic Steel operations recorded segment income of
                        $23 million in 2000 versus segment income of $91 million
                        in 1999, a decrease of $68 million. The 2000 segment
                        income included $36 million for certain environmental
                        and legal accruals, a $34 million charge to establish
                        reserves against notes and receivables from financially
                        distressed steel companies and a $10 million charge for
                        USX's share of Republic special charges. Results in 1999
                        included $17 million in charges for certain
                        environmental and legal accruals and $7 million in
                        various non-recurring equity investee charges. Excluding
                        these items, the decrease in segment income for Domestic
                        Steel was primarily due to higher costs related to
                        energy and inefficient operating levels due to lower
                        throughput, lower income from raw materials operations,
                        particularly coal operations and lower sheet shipments
                        resulting from high levels of imports that continued in
                        2000.

                            Segment income for Domestic Steel operations in 1999
                        decreased $426 million from 1998. Results in 1998
                        included a net favorable $30 million for an insurance
                        litigation settlement and charges of $10 million related
                        to a voluntary workforce reduction plan. Excluding these
                        items, the decrease in segment income for Domestic Steel
                        was primarily due to lower average steel prices, lower
                        income from raw materials operations, a less favorable
                        product mix and lower income from investees.

                        Segment income for U. S. Steel Kosice

                            USSK segment income for the period following the
                        November 24, 2000 acquisition through year-end 2000 was
                        $2 million.

                        Items not allocated to segments

                            Net pension credits, which are primarily noncash,
                        totaled $266 million in 2000, $228 million in 1999 and
                        $186 million in 1998. Net pension credits in 1999
                        included $35 million for a one-time favorable pension
                        settlement primarily related to the voluntary early
                        retirement program for salaried employees. For
                        additional information on pensions, see Note 12 to the
                        U. S. Steel Group Financial Statements.

                            Asset impairments - Coal, were for asset impairments
                        at U. S. Steel Mining's coal mines in Alabama and West
                        Virginia in 2000 following a reassessment of long-term
                        prospects after adverse geological conditions were
                        encountered.

U-62


                        Management's Discussion and Analysis  continued

                            Administrative expenses are corporate general and
                        administrative costs allocated to the U. S. Steel Group
                        by USX based upon utilization or other methods
                        management believes to be reasonable and which consider
                        certain measures of business activities, such as
                        employment, investments and revenues. The costs
                        allocated to the U. S. Steel Group were $25 million in
                        2000, $17 million in 1999 and $24 million in 1998, which
                        primarily consist of employment costs including pension
                        effects, professional services, facilities and other
                        related costs associated with corporate activities. The
                        increase from 1999 to 2000 primarily resulted from the
                        nonrecurrence of favorable 1999 franchise tax
                        settlements and employee compensation costs. The
                        decrease from 1998 to 1999 was largely the result of
                        lower franchise taxes, primarily due to settlements of
                        prior years' taxes.

                            Cost related to former business activities increased
                        $8 million in 2000 from 1999 primarily due to higher
                        litigation expenses. Costs related to former business
                        activities decreased $17 million in 1999 from 1998
                        primarily due to lower litigation expenses and lower
                        payments to a multiemployer health care benefit plan
                        created by the Coal Industry Retiree Health Benefit Act
                        of 1992.

                            In 1999, an impairment of USX's investment in
                        USS/Kobe and costs related to the formation of Republic
                        totaled $47 million.

                            Income from operations in 1999 also included a loss
                        on investment in RTI stock used to satisfy indexed debt
                        obligations of $22 million from the termination of
                        ownership in RTI International Metals, Inc. For further
                        discussion, see Note 6 to the U. S. Steel Group
                        Financial Statements.

                        Outlook for 2001 - U. S. Steel Group

                            This outlook is as of the original filing date of
                        March 12, 2001. For an updated outlook, see subsequent
                        filings with the U.S. Securities and Exchange
                        Commission.

                            Domestic Steel's order book and prices remain soft
                        due to continued high import volumes (which in 2000 were
                        second only to record-year 1998 levels), a draw-down of
                        inventories by spot purchasers and increasing evidence
                        that the growth in the domestic economy is slowing. In
                        addition to these factors, our plate products business
                        is being impacted by recently added domestic capacity.
                        Although domestic shipments for the first quarter of
                        2001 are projected to be somewhat better than fourth
                        quarter 2000 levels, we expect that sheet and plate
                        pricing, which declined markedly in the fourth quarter,
                        will continue to be depressed as a result of the factors
                        cited above. The tubular business, however, remains
                        strong. For the year 2001, domestic shipments are
                        expected to be approximately 11 million net tons,
                        excluding any shipments from the potential acquisition
                        of LTV Corporation tin operations. For the year 2001,
                        USSK shipments are expected to be approximately 3.3
                        million to 3.6 million net tons.

                            High natural gas prices adversely affected our
                        results in 2000 and are expected to persist for some
                        time. The blast furnace idled at Gary Works in July 2000
                        for a planned 10-day outage remained down until late
                        February 2001 due to business conditions. The U. S.
                        Steel Group has continued its cost reduction efforts,
                        and has recently requested from its current suppliers an
                        immediate, temporary eight percent price reduction from
                        existing levels to help weather this difficult period.

                            Several domestic competitors recently have filed for
                        Chapter 11 bankruptcy protection. This provides them
                        with certain competitive advantages and further
                        demonstrates the very difficult economic circumstances
                        faced by the domestic industry.

                            U. S. Steel Group's income from operations includes
                        net pension credits, which are primarily noncash,
                        associated with all of U. S. Steel's pension plans. Net
                        pension credits were $266 million in 2000. At the end of
                        2000, U. S. Steel's main pension plans' transition asset
                        was fully amortized, decreasing the pension credit by
                        $69 million annually in future years for this component.
                        In addition, for the year 2001, low marketplace returns
                        on trust assets in the year 2000 and pending business
                        combinations in the current year are expected to further
                        reduce net pension credits to approximately $160
                        million. The above includes forward-looking statements
                        concerning net pension credits which can vary depending
                        upon the market performance of plan assets, changes in
                        actuarial assumptions regarding such factors as the
                        selection of a discount rate and rate of return on plan
                        assets, changes in the amortization levels of transition
                        amounts or prior period service costs, plan amendments
                        affecting

                                                                            U-63


                        Management's Discussion and Analysis  continued

                        benefit payout levels, business combinations and profile
                        changes in the beneficiary populations being valued.
                        Changes in any of these factors could cause net pension
                        credits to change. To the extent net pension credits
                        decline in the future, income from operations would be
                        adversely affected.

                            The U. S. Steel Group includes a 16 percent equity
                        method investment in Republic (through an ownership
                        interest in Republic Technologies International
                        Holdings, LLC ("Republic Holdings"), which is the sole
                        owner of Republic). In the third quarter of 2000,
                        Republic announced that it had completed a financial
                        restructuring to improve its liquidity position.
                        Republic raised approximately $30 million in loans from
                        certain of its direct and indirect equity partners in
                        exchange for notes of Republic and warrants to purchase
                        Class D common stock of Republic Technologies
                        International, Inc., Republic's majority owner. The U.
                        S. Steel Group's portion was approximately $6 million
                        and the U. S. Steel Group also agreed to certain
                        deferred payment terms into the year 2002, up to a
                        maximum of $30 million, with regard to Republic's
                        obligations relating to iron ore pellets supplied to
                        Republic. In its Form 10-Q for the period ended
                        September 30, 2000, which was filed with the SEC on
                        October 31, 2000, Republic Holdings stated that
                        "Notwithstanding these efforts, [Republic Holdings] may
                        need to obtain additional financing to meet its cash
                        flow requirements, including financing from the sale of
                        additional debt or equity securities." Republic Holdings
                        also stated "As a result of the factors mentioned above,
                        [Republic Holdings] is highly leveraged and could be
                        considered a risky investment."

                            At December 31, 2000, the U. S. Steel Group's
                        financial exposure to Republic totaled approximately
                        $131 million, consisting of amounts owed by Republic to
                        the U. S. Steel Group and debt obligations assumed by
                        Republic.

                            In early October 2000, the U. S. Steel Group
                        announced an agreement with LTV Corporation ("LTV") to
                        purchase LTV's tin mill products business, including its
                        Indiana Harbor, Indiana tin operations. This acquisition
                        recently closed and was effective March 1, 2001. Terms
                        of this noncash transaction call for the U. S. Steel
                        Group to assume certain employee-related obligations of
                        LTV. The U. S. Steel Group intends to operate these
                        facilities as an ongoing business and tin mill employees
                        at Indiana Harbor became U. S. Steel Group employees.
                        The U. S. Steel Group and LTV also entered into 5-year
                        agreements for LTV to supply the U. S. Steel Group with
                        pickled hot bands and for the U. S. Steel Group to
                        provide LTV with processing of cold rolled steel.

                            In October 2000, Transtar announced it had entered
                        into a Reorganization and Exchange Agreement with its
                        two voting shareholders. Upon closing, Transtar and
                        certain of its subsidiaries, namely, the Birmingham
                        Southern Railroad Company; the Elgin, Joliet and Eastern
                        Railway Company; the Lake Terminal Railroad Company; the
                        McKeesport Connecting Railroad Company; the Mobile River
                        Terminal Company, Inc.; the Union Railroad Company; the
                        Warrior & Gulf Navigation Company; and Tracks Traffic
                        and Management Services, Inc. will become subsidiaries
                        within the U. S. Steel Group. The other shareholder,
                        Transtar Holdings, L.P., an affiliate of Blackstone
                        Capital Partners L.P., will become the owner of the
                        other subsidiaries.

                            The preceding statements concerning anticipated
                        steel demand, steel pricing, and shipment levels are
                        forward-looking and are based upon assumptions as to
                        future product prices and mix, and levels of steel
                        production capability, production and shipments. These
                        forward-looking statements can be affected by imports,
                        domestic and international economies, domestic
                        production capacity, the completion of the LTV and
                        Transtar transactions, and customer demand. In the event
                        these assumptions prove to be inaccurate, actual results
                        may differ significantly from those presently
                        anticipated.

U-64


                        Quantitative and Qualitative Disclosures About Market
                        Risk

                        Management Opinion Concerning Derivative Instruments

                            USX uses commodity-based and foreign currency
                        derivative instruments to manage its price risk.
                        Management has authorized the use of futures, forwards,
                        swaps and options to manage exposure to price
                        fluctuations related to the purchase, production or sale
                        of crude oil, natural gas, refined products, and
                        nonferrous metals. For transactions that qualify for
                        hedge accounting, the resulting gains or losses are
                        deferred and subsequently recognized in income from
                        operations, in the same period as the underlying
                        physical transaction. Derivative instruments used for
                        trading and other activities are marked-to-market and
                        the resulting gains or losses are recognized in the
                        current period in income from operations. While USX's
                        risk management activities generally reduce market risk
                        exposure due to unfavorable commodity price changes for
                        raw material purchases and products sold, such
                        activities can also encompass strategies that assume
                        price risk.

                            Management believes that use of derivative
                        instruments along with risk assessment procedures and
                        internal controls does not expose USX to material risk.
                        The use of derivative instruments could materially
                        affect USX's results of operations in particular
                        quarterly or annual periods. However, management
                        believes that use of these instruments will not have a
                        material adverse effect on financial position or
                        liquidity. For a summary of accounting policies related
                        to derivative instruments, see Note 1 to the USX
                        Consolidated Financial Statements.

                        Commodity Price Risk and Related Risks

                            In the normal course of its business, USX is exposed
                        to market risk or price fluctuations related to the
                        purchase, production or sale of crude oil, natural gas,
                        refined products and steel products. To a lesser extent,
                        USX is exposed to the risk of price fluctuations on
                        coal, coke, natural gas liquids, petroleum feedstocks
                        and certain nonferrous metals used as raw materials.

                            USX's market risk strategy has generally been to
                        obtain competitive prices for its products and services
                        and allow operating results to reflect market price
                        movements dictated by supply and demand. However, USX
                        uses fixed-price contracts and derivative commodity
                        instruments to manage a relatively small portion of its
                        commodity price risk. USX uses fixed-price contracts for
                        portions of its natural gas production to manage
                        exposure to fluctuations in natural gas prices. Certain
                        derivative commodity instruments have the effect of
                        restoring the equity portion of fixed-price sales of
                        natural gas to variable market-based pricing. These
                        instruments are used as part of USX's overall risk
                        management programs.

                                                                            U-65


                        Quantitative and Qualitative Disclosures
                        About Market Risk  continued

                             Sensitivity analyses of the incremental effects on
                        pretax income of hypothetical 10% and 25% changes in
                        commodity prices for open derivative commodity
                        instruments as of December 31, 2000 and December 31,
                        1999, are provided for the Marathon Group in the
                        following table. While the U. S. Steel Group uses
                        derivative commodity instruments, its usage is
                        immaterial to the results of operations.



                        (Dollars in millions)
                        ------------------------------------------------------------------------------------------------------------
                                                                                               Incremental Decrease in
                                                                                              Pretax Income Assuming a
                                                                                                 Hypothetical Price
                                                                                                    Change of/(a)/
                                                                                         2000                       1999
                        Derivative Commodity Instruments                           10%            25%          10%          25%
                        ------------------------------------------------------------------------------------------------------------
                                                                                                            
                        Marathon Group/(b)(c)/:
                         Crude oil/(d)/
                           Trading                                              $      -      $    - /(e)/ $    1.3     $  7.7 /(e)/
                           Other than trading                                        9.1        27.2 /(e)/     16.5       54.0 /(e)/
                         Natural gas/(d)/
                           Trading                                                     -           - /(e)/        -          - /(f)/
                           Other than trading                                       20.2        50.6 /(e)/      4.7       16.8 /(f)/
                         Refined products/(d)/
                           Trading                                                     -           - /(e)/        -          - /(e)/
                           Other than trading                                        6.1        16.5 /(e)/      8.4       23.8 /(e)/
                        ------------------------------------------------------------------------------------------------------------


                        /(a)/ Gains and losses on derivative commodity
                              instruments are generally offset by price changes
                              in the underlying commodity. Effects of these
                              offsets are not reflected in the sensitivity
                              analyses. Amounts reflect the estimated
                              incremental effect on pretax income of
                              hypothetical 10% and 25% changes in closing
                              commodity prices for each open contract position
                              at December 31, 2000 and December 31, 1999.
                              Marathon Group management evaluates their
                              portfolio of derivative commodity instruments on
                              an ongoing basis and adds or revises strategies to
                              reflect anticipated market conditions and changes
                              in risk profiles. Changes to the portfolio
                              subsequent to December 31, 2000, would cause
                              future pretax income effects to differ from those
                              presented in the table.
                        /(b)/ The number of net open contracts varied throughout
                              2000, from a low of 12,252 contracts at July 5, to
                              a high of 34,554 contracts at October 25, and
                              averaged 21,875 for the year. The derivative
                              commodity instruments used and hedging positions
                              taken also varied throughout 2000, and will
                              continue to vary in the future. Because of these
                              variations in the composition of the portfolio
                              over time, the number of open contracts, by
                              itself, cannot be used to predict future income
                              effects.
                        /(c)/ The calculation of sensitivity amounts for basis
                              swaps assumes that the physical and paper indices
                              are perfectly correlated. Gains and losses on
                              options are based on changes in intrinsic value
                              only.
                        /(d)/ The direction of the price change used in
                              calculating the sensitivity amount for each
                              commodity reflects that which would result in the
                              largest incremental decrease in pretax income when
                              applied to the derivative commodity instruments
                              used to hedge that commodity.
                        /(e)/ Price increase.
                        /(f)/ Price decrease.

U-66


                        Quantitative and Qualitative Disclosures
                        About Market Risk  continued

                            In total, Marathon's exploration and production
                        operations recorded net pretax other than trading
                        activity losses of approximately $34 million in 2000,
                        gains of $3 million in 1999 and losses of $3 million in
                        1998.

                            Marathon's refining, marketing and transportation
                        operations generally use derivative commodity
                        instruments to lock-in costs of certain crude oil and
                        other feedstocks, to protect carrying values of
                        inventories and to protect margins on fixed-price sales
                        of refined products. Marathon's refining, marketing and
                        transportation operations recorded net pretax other than
                        trading activity losses, net of the 38% minority
                        interest in MAP, of approximately $116 million in 2000,
                        and net pretax other than trading activity gains, net of
                        the 38% minority interest in MAP, of $8 million in 1999
                        and $28 million in 1998. Marathon's refining, marketing
                        and transportation operations used derivative
                        instruments for trading activities and recorded net
                        pretax trading activity losses, net of the 38% minority
                        interest in MAP, of $11 million in 2000 and net pretax
                        trading activity gains, net of the 38% minority interest
                        in MAP, of $5 million in 1999.

                            The U. S. Steel Group uses OTC commodity swaps to
                        manage exposure to market risk related to the purchase
                        of natural gas, heating oil and certain nonferrous
                        metals. The U. S. Steel Group recorded net pretax other
                        than trading activity gains of $2 million in 2000,
                        losses of $4 million in 1999 and losses of $6 million in
                        1998. These gains and losses were offset by changes in
                        the realized prices of the underlying hedged
                        commodities.

                            For additional quantitative information relating to
                        derivative commodity instruments, including aggregate
                        contract values and fair values, where appropriate, see
                        Note 24 to the USX Consolidated Financial Statements.

                            USX is subject to basis risk, caused by factors that
                        affect the relationship between commodity futures prices
                        reflected in derivative commodity instruments and the
                        cash market price of the underlying commodity. Natural
                        gas transaction prices are frequently based on industry
                        reference prices that may vary from prices experienced
                        in local markets. For example, New York Mercantile
                        Exchange ("NYMEX") contracts for natural gas are priced
                        at Louisiana's Henry Hub, while the underlying
                        quantities of natural gas may be produced and sold in
                        the Western United States at prices that do not move in
                        strict correlation with NYMEX prices. To the extent that
                        commodity price changes in one region are not reflected
                        in other regions, derivative commodity instruments may
                        no longer provide the expected hedge, resulting in
                        increased exposure to basis risk. These regional price
                        differences could yield favorable or unfavorable
                        results. OTC transactions are being used to manage
                        exposure to a portion of basis risk.

                            USX is subject to liquidity risk, caused by timing
                        delays in liquidating contract positions due to a
                        potential inability to identify a counterparty willing
                        to accept an offsetting position. Due to the large
                        number of active participants, liquidity risk exposure
                        is relatively low for exchange-traded transactions.

                                                                            U-67


                        Quantitative and Qualitative Disclosures
                        About Market Risk  continued

                        Interest Rate Risk

                            USX is subject to the effects of interest rate
                        fluctuations on certain of its non-derivative financial
                        instruments. A sensitivity analysis of the projected
                        incremental effect of a hypothetical 10% decrease in
                        year-end 2000 and 1999 interest rates on the fair value
                        of USX's non-derivative financial instruments, is
                        provided in the following table:



                        (Dollars in millions)
                        ----------------------------------------------------------------------------------------------------------
                        As of December 31,                                                 2000                     1999
                                                                                               Incremental              Incremental
                                                                                               Increase in              Increase in
                                                                                    Fair          Fair         Fair        Fair
                        Non-Derivative Financial Instruments/(a)/                Value/(b)/   Value/(c)/   Value/(b)/   Value/(c)/
                        -----------------------------------------------------------------------------------------------------------
                                                                                                            
                        Financial assets:
                         Investments and long-term receivables/(d)/              $     211     $     -      $    190     $      -

                        Financial liabilities:
                         Long-term debt/(e)(f)/                                  $   4,549     $    166     $  4,278     $    164
                         Preferred stock of subsidiary/(g)/                            238           20          239           21
                         USX obligated mandatorily
                           redeemable convertible preferred
                           securities of a subsidiary trust/(g)/                       119           10          169           15
                                                                                 ----------    ---------    ---------    ----------
                              Total liabilities                                  $   4,906     $    196     $  4,686     $    200
                        -----------------------------------------------------------------------------------------------------------


                        /(a)/ Fair values of cash and cash equivalents,
                              receivables, notes payable, accounts payable and
                              accrued interest, approximate carrying value and
                              are relatively insensitive to changes in interest
                              rates due to the short-term maturity of the
                              instruments. Accordingly, these instruments are
                              excluded from the table.
                        /(b)/ See Note 25 to the USX Consolidated Financial
                              Statements for carrying value of instruments.
                        /(c)/ Reflects, by class of financial instrument, the
                              estimated incremental effect of a hypothetical 10%
                              decrease in interest rates at December 31, 2000
                              and December 31, 1999, on the fair value of USX's
                              non-derivative financial instruments. For
                              financial liabilities, this assumes a 10% decrease
                              in the weighted average yield to maturity of USX's
                              long-term debt at December 31, 2000 and December
                              31, 1999.
                        /(d)/ For additional information, see Note 12 to the USX
                              Consolidated Financial Statements.
                        /(e)/ Includes amounts due within one year.
                        /(f)/ Fair value was based on market prices where
                              available, or current borrowing rates for
                              financings with similar terms and maturities. For
                              additional information, see Note 14 to the USX
                              Consolidated Financial Statements.
                        /(g)/ See Note 22 to the USX Consolidated Financial
                              Statements.

                            At December 31, 2000, USX's portfolio of long-term
                        debt was comprised primarily of fixed-rate instruments.
                        Therefore, the fair value of the portfolio is relatively
                        sensitive to effects of interest rate fluctuations. This
                        sensitivity is illustrated by the $166 million increase
                        in the fair value of long-term debt assuming a
                        hypothetical 10% decrease in interest rates. However,
                        USX's sensitivity to interest rate declines and
                        corresponding increases in the fair value of its debt
                        portfolio would unfavorably affect USX's results and
                        cash flows only to the extent that USX elected to
                        repurchase or otherwise retire all or a portion of its
                        fixed-rate debt portfolio at prices above carrying
                        value.

                        Foreign Currency Exchange Rate Risk

                            USX is subject to the risk of price fluctuations
                        related to anticipated revenues and operating costs,
                        firm commitments for capital expenditures and existing
                        assets or liabilities denominated in currencies other
                        than U.S. dollars, such as the Euro, the Slovak koruna
                        and the Canadian dollar. USX has not generally used
                        derivative instruments to manage this risk. However, USX
                        has made limited use of forward currency contracts to
                        manage exposure to certain currency price fluctuations.
                        At December 31, 2000, USX had open Canadian dollar
                        forward purchase contracts with a total carrying value
                        of approximately $14 million compared to $52 million at
                        December 31, 1999. A 10% increase in the December 31,
                        2000, Canadian dollar to U.S. dollar forward rate, would
                        result in a charge to income of approximately $1
                        million. Last year, a 10% increase in the December 31,
                        1999, Canadian dollar to U.S. dollar forward rate, would
                        have resulted in a charge to income of $5 million.

U-68


                        Quantitative and Qualitative Disclosures
                        About Market Risk  continued

                        Equity Price Risk

                            USX is subject to equity price risk and liquidity
                        risk related to its investment in VSZ, which is
                        attributed to the U. S. Steel Group. These risks are not
                        readily quantifiable.

                        Safe Harbor

                            USX's quantitative and qualitative disclosures about
                        market risk include forward-looking statements with
                        respect to management's opinion about risks associated
                        with USX's use of derivative instruments. These
                        statements are based on certain assumptions with respect
                        to market prices and industry supply of and demand for
                        crude oil, natural gas, refined products, steel products
                        and certain raw materials. To the extent that these
                        assumptions prove to be inaccurate, future outcomes with
                        respect to USX's hedging programs may differ materially
                        from those discussed in the forward-looking statements.

                                                                            U-69


               Marathon Group

                    Index to Financial Statements, Supplementary Data,
                    Management's Discussion and Analysis, and Quantitative and
                    Qualitative Disclosures About Market Risk



                                                                                                                     Page
                                                                                                                     -----
                                                                                                                  
                    Management's Report............................................................................   M-1

                    Audited Financial Statements:
                     Report of Independent Accountants.............................................................   M-1
                     Statement of Operations.......................................................................   M-2
                     Balance Sheet.................................................................................   M-3
                     Statement of Cash Flows.......................................................................   M-4
                     Notes to Financial Statements.................................................................   M-5

                    Selected Quarterly Financial Data..............................................................   M-22

                    Principal Unconsolidated Affiliates............................................................   M-22

                    Supplementary Information......................................................................   M-22

                    Five-Year Operating Summary ...................................................................   M-23

                    Five-Year Financial Summary....................................................................   M-25

                    Management's Discussion and Analysis...........................................................   M-26

                    Quantitative and Qualitative Disclosures About Market Risk.....................................   M-38



                     Management's Report

                     The accompanying financial statements of the Marathon Group
                     are the responsibility of and have been prepared by USX
                     Corporation (USX) in conformity with accounting principles
                     generally accepted in the United States. They necessarily
                     include some amounts that are based on best judgments and
                     estimates. The Marathon Group financial information
                     displayed in other sections of this report is consistent
                     with these financial statements.
                          USX seeks to assure the objectivity and integrity of
                     its financial records by careful selection of its managers,
                     by organizational arrangements that provide an appropriate
                     division of responsibility and by communications programs
                     aimed at assuring that its policies and methods are
                     understood throughout the organization.
                          USX has a comprehensive formalized system of internal
                     accounting controls designed to provide reasonable
                     assurance that assets are safeguarded and that financial
                     records are reliable. Appropriate management monitors the
                     system for compliance, and the internal auditors
                     independently measure its effectiveness and recommend
                     possible improvements thereto. In addition, as part of
                     their audit of the financial statements, USX's independent
                     accountants, who are elected by the stockholders, review
                     and test the internal accounting controls selectively to
                     establish a basis of reliance thereon in determining the
                     nature, extent and timing of audit tests to be applied.
                          The Board of Directors pursues its oversight role in
                     the area of financial reporting and internal accounting
                     control through its Audit Committee. This Committee,
                     composed solely of nonmanagement directors, regularly meets
                     (jointly and separately) with the independent accountants,
                     management and internal auditors to monitor the proper
                     discharge by each of its responsibilities relative to
                     internal accounting controls and the consolidated and group
                     financial statements.


                                                                                          
                     Thomas J. Usher                         Robert M. Hernandez                Larry G. Schultz
                     Chairman, Board of Directors &          Vice Chairman &                    Vice President-
                     Chief Executive Officer                 Chief Financial Officer            Accounting


                     Report of Independent Accountants

                     To the Stockholders of USX Corporation:

                     In our opinion, the accompanying financial statements
                     appearing on pages M-2 through M-21 present fairly, in all
                     material respects, the financial position of the Marathon
                     Group at December 31, 2000 and 1999, and the results of its
                     operations and its cash flows for each of the three years
                     in the period ended December 31, 2000, in conformity with
                     accounting principles generally accepted in the United
                     States of America. These financial statements are the
                     responsibility of USX's management; our responsibility is
                     to express an opinion on these financial statements based
                     on our audits. We conducted our audits of these statements
                     in accordance with auditing standards generally accepted in
                     the United States of America, which require that we plan
                     and perform the audit to obtain reasonable assurance about
                     whether the financial statements are free of material
                     misstatement. An audit includes examining, on a test basis,
                     evidence supporting the amounts and disclosures in the
                     financial statements, assessing the accounting principles
                     used and significant estimates made by management, and
                     evaluating the overall financial statement presentation. We
                     believe that our audits provide a reasonable basis for our
                     opinion.
                          The Marathon Group is a business unit of USX
                     Corporation (as described in Note 1, page M-5);
                     accordingly, the financial statements of the Marathon Group
                     should be read in connection with the consolidated
                     financial statements of USX Corporation.


                     PricewaterhouseCoopers LLP
                     600 Grant Street, Pittsburgh, Pennsylvania 15219-2794
                     February 7, 2001

                                                                             M-1


Statement of Operations



(Dollars in millions)                                                         2000         1999         1998
---------------------------------------------------------------------------------------------------------------
                                                                                            
Revenues and other income:
 Revenues (Note 6)                                                        $  34,487    $  23,590     $ 21,274
 Dividend and investee income                                                   102           69           50
 Net gains (losses) on disposal of assets (Note 26)                            (785)           -           28
 Gain on ownership change in
   Marathon Ashland Petroleum LLC (Note 5)                                       12           17          245
 Other income                                                                    43           31           26
                                                                           --------     --------     ---------
      Total revenues and other income                                        33,859       23,707       21,623
                                                                           --------     --------     ---------
Costs and expenses:
 Cost of revenues (excludes items shown below)                               25,477       16,653       14,630
 Selling, general and administrative expenses                                   625          486          505
 Depreciation, depletion and amortization                                     1,245          950          941
 Taxes other than income taxes                                                4,626        4,218        4,029
 Exploration expenses                                                           238          238          313
 Inventory market valuation charges (credits) (Note 20)                           -         (551)         267
                                                                           --------     --------     ---------
      Total costs and expenses                                               32,211       21,994       20,685
                                                                           --------     --------     ---------
Income from operations                                                        1,648        1,713          938
Net interest and other financial costs (Note 6)                                 236          288          237
Minority interest in income of
 Marathon Ashland Petroleum LLC (Note 5)                                        498          447          249
                                                                           --------     --------     ---------
Income before income taxes                                                      914          978          452
Provision for income taxes (Note 18)                                            482          324          142
                                                                           --------     --------     ---------
Net income                                                                $     432    $     654     $    310
---------------------------------------------------------------------------------------------------------------

Income Per Common Share

                                                                              2000         1999         1998
---------------------------------------------------------------------------------------------------------------
Basic                                                                     $    1.39    $    2.11     $   1.06
Diluted                                                                        1.39         2.11         1.05
---------------------------------------------------------------------------------------------------------------


See Note 7, for a description and computation of income per common share. The
accompanying notes are an integral part of these financial statements.

M-2


Balance Sheet



(Dollars in millions)                                         December 31             2000         1999
----------------------------------------------------------------------------------------------------------
                                                                                      
Assets

Current assets:
 Cash and cash equivalents                                                        $     340    $     111
 Receivables, less allowance for doubtful accounts
   of $3 and $2                                                                       2,267        1,887
 Inventories (Note 20)                                                                1,867        1,884
 Assets held for sale (Note 26)                                                         330           84
 Deferred income tax benefits (Note 18)                                                  60           23
 Other current assets                                                                   121           92
                                                                                   ---------    ---------
      Total current assets                                                            4,985        4,081

Investments and long-term receivables (Note 19)                                         362          762
Property, plant and equipment - net (Note 16)                                         9,375       10,293
Prepaid pensions (Note 14)                                                              207          225
Other noncurrent assets                                                                 303          313
                                                                                   ---------    ---------
      Total assets                                                                $  15,232    $  15,674
----------------------------------------------------------------------------------------------------------
Liabilities

Current liabilities:
 Notes payable                                                                    $      80    $       -
 Accounts payable                                                                     3,021        2,654
 Income taxes payable (Note 23)                                                         364           97
 Payroll and benefits payable                                                           230          146
 Accrued taxes                                                                          108          107
 Accrued interest                                                                        61           92
 Long-term debt due within one year (Note 12)                                           148           48
                                                                                   ---------    ---------
      Total current liabilities                                                       4,012        3,144

Long-term debt (Note 12)                                                              1,937        3,320
Deferred income taxes (Note 18)                                                       1,354        1,495
Employee benefits (Note 14)                                                             648          564
Deferred credits and other liabilities (Note 23)                                        412          414
Preferred stock of subsidiary (Note 9)                                                  184          184

Minority interest in Marathon Ashland Petroleum LLC (Note 5)                          1,840        1,753

Common Stockholders' Equity (Note 17)                                                 4,845        4,800
                                                                                   ---------    ---------
      Total liabilities and common stockholders' equity                           $  15,232    $  15,674
----------------------------------------------------------------------------------------------------------


The accompanying notes are an integral part of these financial statements.

                                                                             M-3


Statement of Cash Flows



(Dollars in millions)                                                        2000        1999       1998
----------------------------------------------------------------------------------------------------------
                                                                                      
Increase (decrease) in cash and cash equivalents

Operating activities:

Net income                                                               $    432   $     654  $     310
Adjustments to reconcile to net cash provided from
 operating activities:
   Minority interest in income of
    Marathon Ashland Petroleum LLC                                            498         447        249
   Depreciation, depletion and amortization                                 1,245         950        941
   Exploratory dry well costs                                                  86         109        186
   Inventory market valuation charges (credits)                                 -        (551)       267
   Pensions and other postretirement benefits                                  69          36         34
   Deferred income taxes                                                     (240)        105         26
   Gain on ownership change in
    Marathon Ashland Petroleum LLC                                            (12)        (17)      (245)
   Net (gains) losses on disposal of assets                                   785           -        (28)
   Changes in: Current receivables                                           (377)       (844)       240
                Inventories                                                    17         (63)       (13)
                Current accounts payable and accrued expenses                 717       1,106       (233)
   All other - net                                                            (62)         84        (92)
                                                                          --------    --------   --------
      Net cash provided from operating activities                           3,158       2,016      1,642
                                                                          --------    --------   --------

Investing activities:

Capital expenditures                                                       (1,425)     (1,378)    (1,270)
Acquisition of Tarragon Oil and Gas Limited                                     -           -       (686)
Disposal of assets                                                            539         356         65
Restricted cash - withdrawals                                                 271          45         11
                - deposits                                                   (268)        (44)       (32)
Investees - investments                                                       (65)        (59)       (42)
          - loans and advances                                                 (6)        (70)      (103)
          - returns and repayments                                             10           1         71
All other - net                                                                21         (25)       (18)
                                                                          --------    --------   --------
      Net cash used in investing activities                                  (923)     (1,174)    (2,004)
                                                                          --------    --------   --------

Financing activities (Note 9):

Increase (decrease) in Marathon Group's portion of
 USX consolidated debt                                                     (1,200)       (296)       329
Specifically attributed debt:
 Borrowings                                                                   273         141        366
 Repayments                                                                  (279)       (144)      (389)
Marathon Stock   - issued                                                       -          89        613
                 - repurchased                                               (105)          -          -
Treasury common stock reissued                                                  1           -          -
Dividends paid                                                               (274)       (257)      (246)
Distributions to minority shareholder of
 Marathon Ashland Petroleum LLC                                              (420)       (400)      (211)
                                                                          --------    --------   --------
      Net cash provided from (used in) financing activities                (2,004)       (867)       462
                                                                          --------    --------   --------

Effect of exchange rate changes on cash                                        (2)         (1)         1
                                                                          --------    --------   --------

Net increase (decrease) in cash and cash equivalents                          229         (26)       101

Cash and cash equivalents at beginning of year                                111         137         36
                                                                          --------    --------   --------

Cash and cash equivalents at end of year                                 $    340   $     111   $    137
----------------------------------------------------------------------------------------------------------


See Note 13 for supplemental cash flow information.
The accompanying notes are an integral part of these financial statements.

M-4


                    Notes to Financial Statements

1. Basis of Presentation

                    USX Corporation (USX) has two classes of common stock: USX -
                    Marathon Group Common Stock (Marathon Stock) and USX - U. S.
                    Steel Group Common Stock (Steel Stock), which are intended
                    to reflect the performance of the Marathon Group and the
                    U. S. Steel Group, respectively.
                         The financial statements of the Marathon Group include
                    the financial position, results of operations and cash flows
                    for the businesses of Marathon Oil Company (Marathon) and
                    certain other subsidiaries of USX, and a portion of the
                    corporate assets and liabilities and related transactions
                    which are not separately identified with ongoing operating
                    units of USX. The Marathon Group financial statements are
                    prepared using the amounts included in the USX consolidated
                    financial statements. For a description of the Marathon
                    Group's operating segments, see Note 10.
                         Although the financial statements of the Marathon Group
                    and the U. S. Steel Group separately report the assets,
                    liabilities (including contingent liabilities) and
                    stockholders' equity of USX attributed to each such Group,
                    such attribution of assets, liabilities (including
                    contingent liabilities) and stockholders' equity between the
                    Marathon Group and the U. S. Steel Group for the purpose of
                    preparing their respective financial statements does not
                    affect legal title to such assets or responsibility for such
                    liabilities. Holders of Marathon Stock and Steel Stock are
                    holders of common stock of USX and continue to be subject to
                    all the risks associated with an investment in USX and all
                    of its businesses and liabilities. Financial impacts arising
                    from one Group that affect the overall cost of USX's capital
                    could affect the results of operations and financial
                    condition of the other Group. In addition, net losses of
                    either Group, as well as dividends and distributions on any
                    class of USX Common Stock or series of preferred stock and
                    repurchases of any class of USX Common Stock or series of
                    preferred stock at prices in excess of par or stated value,
                    will reduce the funds of USX legally available for payment
                    of dividends on both classes of Common Stock. Accordingly,
                    the USX consolidated financial information should be read in
                    connection with the Marathon Group financial information.

--------------------------------------------------------------------------------
2. Summary of Principal Accounting Policies

                    Principles applied in consolidation - These financial
                    statements include the accounts of the businesses comprising
                    the Marathon Group. The Marathon Group and the U. S. Steel
                    Group financial statements, taken together, comprise all of
                    the accounts included in the USX consolidated financial
                    statements.
                         Investments in unincorporated oil and gas joint
                    ventures, undivided interest pipelines and jointly owned gas
                    processing plants are consolidated on a pro rata basis.
                         Investments in entities over which the Marathon Group
                    has significant influence are accounted for using the equity
                    method of accounting and are carried at the Marathon Group's
                    share of net assets plus loans and advances.
                         Investments in companies whose stock is publicly traded
                    are carried at market value. The difference between the cost
                    of these investments and market value is recorded in other
                    comprehensive income (net of tax). Investments in companies
                    whose stock has no readily determinable fair value are
                    carried at cost.
                         Dividend and investee income includes the Marathon
                    Group's proportionate share of income from equity method
                    investments and dividend income from other investments.
                    Dividend income is recognized when dividend payments are
                    received.
                         Gains or losses from a change in ownership of a
                    consolidated subsidiary or an unconsolidated investee are
                    recognized in the period of change.

                    Use of estimates - Generally accepted accounting principles
                    require management to make estimates and assumptions that
                    affect the reported amounts of assets and liabilities, the
                    disclosure of contingent assets and liabilities at year-end
                    and the reported amounts of revenues and expenses during the
                    year. Significant items subject to such estimates and
                    assumptions include the carrying value of long-lived assets;
                    valuation allowances for receivables, inventories and
                    deferred income tax assets; environmental liabilities;
                    liabilities for potential tax deficiencies and potential
                    litigation claims and settlements; and assets and
                    obligations related to employee benefits. Additionally,
                    certain estimated liabilities are recorded when management
                    commits to a plan to close an operating facility or to exit
                    a business activity. Actual results could differ from the
                    estimates and assumptions used.

                                                                             M-5


                    Revenue recognition - Revenues are recognized generally when
                    products are shipped or services are provided to customers,
                    the sales price is fixed and determinable, and
                    collectibility is reasonably assured. Costs associated with
                    revenues, including shipping and other transportation costs,
                    are recorded in cost of revenues. Matching buy/sell
                    transactions settled in cash are recorded in both revenues
                    and cost of revenues as separate sales and purchase
                    transactions, with no net effect on income. The Marathon
                    Group follows the sales method of accounting for gas
                    production imbalances and would recognize a liability if the
                    existing proved reserves were not adequate to cover the
                    current imbalance situation.

                    Cash and cash equivalents - Cash and cash equivalents
                    include cash on hand and on deposit and investments in
                    highly liquid debt instruments with maturities generally of
                    three months or less.

                    Inventories - Inventories are carried at lower of cost or
                    market. Cost of inventories is determined primarily under
                    the last-in, first-out (LIFO) method.

                    Derivative instruments - The Marathon Group uses commodity-
                    based and foreign currency derivative instruments to manage
                    its exposure to price risk. Management is authorized to use
                    futures, forwards, swaps and options related to the
                    purchase, production or sale of crude oil, natural gas,
                    refined products and electricity. While the Marathon Group's
                    risk management activities generally reduce market risk
                    exposure due to unfavorable commodity price changes for raw
                    material purchases and products sold, such activities can
                    also encompass strategies which assume price risk.

                         Commodity-Based Hedging Transactions - For transactions
                         that qualify for hedge accounting, the resulting gains
                         or losses are deferred and subsequently recognized in
                         income from operations, as a component of revenues or
                         cost of revenues, in the same period as the underlying
                         physical transaction. To qualify for hedge accounting,
                         derivative positions cannot remain open if the
                         underlying physical market risk has been removed. If
                         such derivative positions remain in place, they would
                         be marked-to-market and accounted for as trading or
                         other activities. Recorded deferred gains or losses are
                         reflected within other current and noncurrent assets or
                         accounts payable and deferred credits and other
                         liabilities, as appropriate.

                         Commodity-Based Trading and Other Activities -
                         Derivative instruments used for trading and other
                         activities are marked-to-market and the resulting gains
                         or losses are recognized in the current period within
                         income from operations. This category also includes the
                         use of derivative instruments that have no offsetting
                         underlying physical market risk.

                         Foreign Currency Transactions - The Marathon Group uses
                         forward exchange contracts to manage currency risks.
                         Gains or losses related to firm commitments are
                         deferred and recognized concurrent with the underlying
                         transaction. All other gains or losses are recognized
                         in income in the current period as revenues, cost of
                         revenues, interest income or expense, or other income,
                         as appropriate. Forward exchange contracts are recorded
                         as receivables or payables, as appropriate.

                    Property, plant and equipment - The Marathon Group uses the
                    successful efforts method of accounting for oil and gas
                    producing activities. Costs to acquire mineral interests in
                    oil and gas properties, to drill and equip exploratory wells
                    that find proved reserves, and to drill and equip
                    development wells are capitalized. Costs to drill
                    exploratory wells that do not find proved reserves,
                    geological and geophysical costs, and costs of carrying and
                    retaining unproved properties are expensed.
                         Capitalized costs of producing oil and gas properties
                    are depreciated and depleted by the unit-of-production
                    method. Support equipment and other property, plant and
                    equipment are depreciated over their estimated useful lives.
                         The Marathon Group evaluates its oil and gas producing
                    properties for impairment of value on a field-by-field basis
                    or, in certain instances, by logical grouping of assets if
                    there is significant shared infrastructure, using
                    undiscounted future cash flows based on total proved
                    reserves. Oil and gas producing properties deemed to be
                    impaired are written down to their fair value, as determined
                    by discounted future cash flows based on total proved and
                    risk-adjusted probable and possible reserves or, if
                    available, comparable market values. Unproved oil and gas
                    properties that are individually significant are
                    periodically assessed for impairment of value, and a loss is
                    recognized at the time of impairment. Other unproved
                    properties are amortized over their remaining holding
                    period.
                         When property, plant and equipment depreciated on an
                    individual basis are sold or otherwise disposed of, any
                    gains or losses are reflected in income. Gains on disposal
                    of property, plant and equipment are recognized when earned,
                    which is generally at the time of closing. If a loss or
                    disposal is expected, such losses are recognized when the
                    assets are reclassified as held for sale. Proceeds from
                    disposal of property, plant and equipment depreciated on a
                    group basis are credited to accumulated depreciation,
                    depletion and amortization with no immediate effect on
                    income.

M-6


                    Major maintenance activities - The Marathon Group incurs
                    planned major maintenance costs primarily for refinery
                    turnarounds. Such costs are expensed in the same annual
                    period as incurred; however, estimated annual turnaround
                    costs are recognized in income throughout the year on a pro
                    rata basis.

                    Environmental liabilities - The Marathon Group provides for
                    remediation costs and penalties when the responsibility to
                    remediate is probable and the amount of associated costs is
                    reasonably determinable. Generally, the timing of
                    remediation accruals coincides with completion of a
                    feasibility study or the commitment to a formal plan of
                    action. Remediation liabilities are accrued based on
                    estimates of known environmental exposure and are discounted
                    in certain instances. If recoveries of remediation costs
                    from third parties are probable, a receivable is recorded.
                    Estimated abandonment and dismantlement costs of offshore
                    production platforms are accrued based upon estimated proved
                    oil and gas reserves on a units-of-production method.

                    Insurance - The Marathon Group is insured for catastrophic
                    casualty and certain property and business interruption
                    exposures, as well as those risks required to be insured by
                    law or contract. Costs resulting from noninsured losses are
                    charged against income upon occurrence.

                    Reclassifications - Certain reclassifications of prior
                    years' data have been made to conform to 2000
                    classifications.

--------------------------------------------------------------------------------
3. New Accounting Standards

                    In the fourth quarter of 2000, USX adopted the following
                    accounting pronouncements primarily related to the
                    classification of items in the statement of operations. The
                    adoption of these new pronouncements had no net effect on
                    the financial position or results of operations of the
                    Marathon Group, although they required reclassifications of
                    certain amounts in the statement of operations, including
                    all prior periods presented.

                         .  In December 1999, the Securities and Exchange
                            Commission (SEC) issued Staff Accounting Bulletin
                            No. 101 (SAB 101) "Revenue Recognition in Financial
                            Statements," which summarizes the SEC staff's
                            interpretations of generally accepted accounting
                            principles related to revenue recognition and
                            classification.
                         .  In 2000, the Emerging Issues Task Force of the
                            Financial Accounting Standards Board (EITF) issued
                            EITF Consensus No. 99-19 "Reporting Revenue Gross as
                            a Principal versus Net as an Agent," which addresses
                            whether certain items should be reported as a
                            reduction of revenue or as a component of both
                            revenues and cost of revenues, and EITF Consensus
                            No. 00-10 "Accounting for Shipping and Handling Fees
                            and Costs," which addresses the classification of
                            costs incurred for shipping goods to customers.

                         In June 1998, the Financial Accounting Standards Board
                    issued Statement of Financial Accounting Standards No. 133,
                    "Accounting for Derivative Instruments and Hedging
                    Activities" (SFAS No. 133), which later was amended by SFAS
                    Nos. 137 and 138. This Standard requires recognition of all
                    derivatives as either assets or liabilities at fair value.
                    Changes in fair value will be reflected in either current
                    period net income or other comprehensive income, depending
                    on the designation of the derivative instrument. The
                    Marathon Group may elect not to designate a derivative
                    instrument as a hedge even if the strategy would be expected
                    to qualify for hedge accounting treatment. The adoption of
                    SFAS No. 133 will change the timing of recognition for
                    derivative gains and losses as compared to previous
                    accounting standards.
                         The Marathon Group will adopt the Standard effective
                    January 1, 2001. The transition adjustment resulting from
                    the adoption of SFAS No. 133 will be reported as a
                    cumulative effect of a change in accounting principle. The
                    unfavorable cumulative effect on net income, net of tax, is
                    expected to approximate $9 million. The unfavorable
                    cumulative effect on other comprehensive income, net of tax,
                    will approximate $7 million. The amounts reported as other
                    comprehensive income will be reflected in net income when
                    the anticipated physical transactions are consummated. It is
                    not possible to estimate the effect that this Standard will
                    have on future results of operations.

                                                                             M-7


--------------------------------------------------------------------------------
4. Corporate Activities

                        Financial activities - As a matter of policy, USX
                        manages most financial activities on a centralized,
                        consolidated basis. Such financial activities include
                        the investment of surplus cash; the issuance, repayment
                        and repurchase of short-term and long-term debt; the
                        issuance, repurchase and redemption of preferred stock;
                        and the issuance and repurchase of common stock.
                        Transactions related primarily to invested cash,
                        short-term and long-term debt (including convertible
                        debt), related net interest and other financial costs,
                        and preferred stock and related dividends are attributed
                        to the Marathon Group and the U. S. Steel Group based
                        upon the cash flows of each group for the periods
                        presented and the initial capital structure of each
                        group. Most financing transactions are attributed to and
                        reflected in the financial statements of all groups. See
                        Note 9, for the Marathon Group's portion of USX's
                        financial activities attributed to all groups. However,
                        transactions such as leases, certain collaterized
                        financings, certain indexed debt instruments, financial
                        activities of consolidated entities which are less than
                        wholly owned by USX and transactions related to
                        securities convertible solely into any one class of
                        common stock are or will be specifically attributed to
                        and reflected in their entirety in the financial
                        statements of the group to which they relate.

                        Corporate general and administrative costs - Corporate
                        general and administrative costs are allocated to the
                        Marathon Group and the U. S. Steel Group based upon
                        utilization or other methods management believes to be
                        reasonable and which consider certain measures of
                        business activities, such as employment, investments and
                        revenues. The costs allocated to the Marathon Group were
                        $36 million in 2000, $26 million in 1999 and $28 million
                        in 1998, and primarily consist of employment costs
                        including pension effects, professional services,
                        facilities and other related costs associated with
                        corporate activities.

                        Income taxes - All members of the USX affiliated group
                        are included in the consolidated United States federal
                        income tax return filed by USX. Accordingly, the
                        provision for federal income taxes and the related
                        payments or refunds of tax are determined on a
                        consolidated basis. The consolidated provision and the
                        related tax payments or refunds have been reflected in
                        the Marathon Group and the U. S. Steel Group financial
                        statements in accordance with USX's tax allocation
                        policy. In general, such policy provides that the
                        consolidated tax provision and related tax payments or
                        refunds are allocated between the Marathon Group and the
                        U. S. Steel Group for group financial statement
                        purposes, based principally upon the financial income,
                        taxable income, credits, preferences and other amounts
                        directly related to the respective groups.
                             For tax provision and settlement purposes, tax
                        benefits resulting from attributes (principally net
                        operating losses and various tax credits), which cannot
                        be utilized by one of the groups on a separate return
                        basis but which can be utilized on a consolidated basis
                        in that year or in a carryback year, are allocated to
                        the group that generated the attributes. To the extent
                        that one of the groups is allocated a consolidated tax
                        attribute which, as a result of expiration or otherwise,
                        is not ultimately utilized on the consolidated tax
                        return, the prior years' allocation of such attribute is
                        adjusted such that the effect of the expiration is borne
                        by the group that generated the attribute. Also, if a
                        tax attribute cannot be utilized on a consolidated basis
                        in the year generated or in a carryback year, the prior
                        years' allocation of such consolidated tax effects is
                        adjusted in a subsequent year to the extent necessary to
                        allocate the tax benefits to the group that would have
                        realized the tax benefits on a separate return basis. As
                        a result, the allocated group amounts of taxes payable
                        or refundable are not necessarily comparable to those
                        that would have resulted if the groups had filed
                        separate tax returns.

--------------------------------------------------------------------------------
5. Business Combinations

                        In August 1998, Marathon acquired Tarragon Oil and Gas
                        Limited (Tarragon), a Canadian oil and gas exploration
                        and production company. Securityholders of Tarragon
                        received, at their election, Cdn$14.25 for each Tarragon
                        share, or the economic equivalent in Exchangeable Shares
                        of an indirect Canadian subsidiary of Marathon,
                        which are exchangeable solely on a one-for-one basis
                        into Marathon Stock. The purchase price included cash
                        payments of $686 million, issuance of 878,074
                        Exchangeable Shares valued at $29 million and the
                        assumption of $345 million in debt.
                             The Exchangeable Shares are exchangeable at the
                        option of the holder at any time and automatically
                        redeemable on August 11, 2003 (and, in certain
                        circumstances, as early as August 11, 2001). The holders
                        of Exchangeable Shares are entitled to receive declared
                        dividends equivalent to dividends declared from time to
                        time by USX on Marathon Stock.
                             USX accounted for the acquisition using the
                        purchase method of accounting. The 1998 results of
                        operations include the operations of Marathon Canada
                        Limited, formerly known as Tarragon, commencing August
                        12, 1998.

M-8


                             During 1997, Marathon and Ashland Inc. (Ashland)
                        agreed to combine the major elements of their refining,
                        marketing and transportation (RM&T) operations. On
                        January 1, 1998, Marathon transferred certain RM&T net
                        assets to Marathon Ashland Petroleum LLC (MAP), a new
                        consolidated subsidiary. Also on January 1, 1998,
                        Marathon acquired certain RM&T net assets from Ashland
                        in exchange for a 38% interest in MAP. The acquisition
                        was accounted for under the purchase method of
                        accounting. The purchase price was determined to be $1.9
                        billion, based upon an external valuation. The change in
                        Marathon's ownership interest in MAP resulted in a gain
                        of $245 million in 1998. In accordance with MAP closing
                        agreements, Marathon and Ashland have made capital
                        contributions to MAP for environmental improvements. The
                        closing agreements stipulate that ownership interests in
                        MAP will not be adjusted as a result of such
                        contributions. Accordingly, Marathon recognized a gain
                        on ownership change of $12 million in 2000 and $17
                        million in 1999.
                             In connection with the formation of MAP, Marathon
                        and Ashland entered into a Limited Liability Company
                        Agreement dated January 1, 1998 (the LLC Agreement). The
                        LLC Agreement provides for an initial term of MAP
                        expiring on December 31, 2022 (25 years from its
                        formation). The term will automatically be extended for
                        ten-year periods, unless a termination notice is given
                        by either party.
                             Also in connection with the formation of MAP, the
                        parties entered into a Put/Call, Registration Rights and
                        Standstill Agreement (the Put/Call Agreement). The
                        Put/Call Agreement provides that at any time after
                        December 31, 2004, Ashland will have the right to sell
                        to Marathon all of Ashland's ownership interest in MAP,
                        for an amount in cash and/or Marathon or USX debt or
                        equity securities equal to the product of 85% (90% if
                        equity securities are used) of the fair market value of
                        MAP at that time, multiplied by Ashland's percentage
                        interest in MAP. Payment could be made at closing, or at
                        Marathon's option, in three equal annual installments,
                        the first of which would be payable at closing. At any
                        time after December 31, 2004, Marathon will have the
                        right to purchase all of Ashland's ownership interests
                        in MAP, for an amount in cash equal to the product of
                        115% of the fair market value of MAP at that time,
                        multiplied by Ashland's percentage interest in MAP.

--------------------------------------------------------------------------------
6. Other Items



                        (In millions)                                                         2000         1999         1998
                        ----------------------------------------------------------------------------------------------------------
                                                                                                            
                        Net interest and other financial costs

                          Interest and other financial income/(a)/:
                              Interest income                                              $     26     $     15     $     30
                              Other                                                              (2)         (13)           4
                                                                                           --------     --------     --------
                                 Total                                                           24            2           34
                                                                                           --------     --------     --------
                           Interest and other financial costs/(a)/:
                              Interest incurred                                                 240          281          285
                              Less interest capitalized                                          16           20           40
                                                                                           --------     --------     --------
                               Net interest                                                     224          261          245
                              Interest on tax issues                                              6            5            5
                              Financial costs on preferred stock of subsidiary                   17           17           17
                              Amortization of discounts                                           2            2            4
                              Other                                                              11            5            -
                                                                                           --------     --------     --------
                                 Total                                                          260          290          271
                                                                                           --------     --------     --------
                           Net interest and other financial costs/(a)/                     $    236     $    288     $    237
                        ----------------------------------------------------------------------------------------------------------
                        /(a)/ See Note 4, for discussion of USX net interest and other financial costs attributable to the Marathon
                              Group.
                        ----------------------------------------------------------------------------------------------------------

                        Foreign currency transactions

                           For 2000, 1999 and 1998, the aggregate foreign
                           currency transaction gains (losses) included in
                           determining net income were $30 million, $(12)
                           million and $13 million, respectively.

                        Consumer excise taxes

                           Included in revenues and costs and expenses for 2000,
                           1999 and 1998 were $4,344 million, $3,973 million and
                           $3,824 million, respectively, representing consumer
                           excise taxes on petroleum products and merchandise.

--------------------------------------------------------------------------------
7. Income Per Common Share

                        The method of calculating net income per share for the
                        Marathon Stock and the Steel Stock reflects the USX
                        Board of Directors' intent that the separately reported
                        earnings and surplus of the Marathon Group and the U. S.
                        Steel Group, as determined consistent with the USX
                        Restated Certificate of Incorporation, are available for
                        payment of dividends to the respective classes of stock,
                        although legally available funds and liquidation
                        preferences of these classes of stock do not necessarily
                        correspond with these amounts.

                                                                             M-9


                             Basic net income per share is based on the weighted
                        average number of common shares outstanding. Diluted net
                        income per share assumes exercise of stock options,
                        provided the effect is not antidilutive.



                                                                      2000                    1999                   1998
                                                                ------------------      ------------------     ------------------
              Computation of Income Per Share                   Basic      Diluted      Basic     Diluted      Basic      Diluted
              -------------------------------                   -----      -------      -----     -------      -----      -------
                                                                                                      
              Net income (millions)                           $    432   $    432    $    654    $    654    $    310   $     310
                                                              ========   ========    ========    ========    ========   =========
              Shares of common stock outstanding (thousands):
               Average number of common shares outstanding     311,531    311,531     309,696     309,696     292,876     292,876
               Effect of dilutive securities -
                 Stock options                                       -        230           -         314           -         559
                                                              --------    -------    --------    --------    --------   ---------
                    Average common shares and dilutive effect  311,531    311,761     309,696     310,010     292,876     293,435
                                                              ========    =======    ========    ========    ========   =========
              Net income per share                            $   1.39    $  1.39    $   2.11    $   2.11    $   1.06   $    1.05
                                                              ========    =======    ========    ========    ========   =========

--------------------------------------------------------------------------------
8. Transactions Between MAP and Ashland

                        At December 31, 2000 and 1999, MAP had current
                        receivables from Ashland of $35 million and $26 million,
                        respectively, and current payables to Ashland of $2
                        million.
                             MAP has a $190 million revolving credit agreement
                        with Ashland. Interest on borrowings is based on defined
                        short-term market rates. At December 31, 2000 and 1999,
                        there were no borrowings against this facility.
                             During 2000, 1999 and 1998, MAP's sales to Ashland,
                        consisting primarily of petroleum products, were $285
                        million, $198 million and $190 million, respectively,
                        and MAP's purchases of products and services from
                        Ashland were $26 million, $22 million and $47 million,
                        respectively. These transactions were conducted under
                        terms comparable to those with unrelated parties.

--------------------------------------------------------------------------------
9. Financial Activities Attributed to Groups

                        The following is the portion of USX financial activities
                        attributed to the Marathon Group. These amounts exclude
                        amounts specifically attributed to the Marathon Group.



                                                                                      Marathon Group          Consolidated USX/(a)/
                                                                                    -------------------       ---------------------
                        (In millions)                     December 31                2000        1999          2000        1999
                        -----------------------------------------------------------------------------------------------------------
                                                                                                          
                        Cash and cash equivalents                                 $    193    $      8       $    364    $     9
                        Other noncurrent assets                                          4           7              7          8
                                                                                  --------    --------       --------    -------
                              Total assets                                        $    197    $     15       $    371    $    17
                        --------------------------------------------------------------------------------------------------------
                        Notes payable                                             $     80    $      -       $    150    $     -
                        Accrued interest                                                50          82             95         95
                        Long-term debt due within one year (Note 12)                   147          47            277         54
                        Long-term debt (Note 12)                                     1,930       3,305          3,734      3,771
                        Preferred stock of subsidiary                                  184         184            250        250
                                                                                  --------    --------       --------    -------
                              Total liabilities                                   $  2,391    $  3,618       $  4,506    $ 4,170
                        -----------------------------------------------------------------------------------------------------------
                                                                                Marathon Group/(b)/            Consolidated USX
                                                                              ----------------------       ------------------------
                        (In millions)                                         2000    1999     1998        2000     1999    1998
                        -----------------------------------------------------------------------------------------------------------
                        Net interest and other financial costs (Note 6)       $250    $295     $295        $309     $334    $324
                        -----------------------------------------------------------------------------------------------------------

                        /(a)/ For details of USX long-term debt and preferred
                              stock of subsidiary, see Notes 14 and 22,
                              respectively, to the USX consolidated financial
                              statements.
                        /(b)/ The Marathon Group's net interest and other
                              financial costs reflect weighted average effects
                              of all financial activities attributed to all
                              groups.

--------------------------------------------------------------------------------
10. Segment Information

                        The Marathon Group's operations consist of three
                        reportable operating segments: 1) Exploration and
                        Production - explores for and produces crude oil and
                        natural gas on a worldwide basis; 2) Refining, Marketing
                        and Transportation - refines, markets and transports
                        crude oil and petroleum products, primarily in the
                        Midwest and southeastern United States through MAP; and
                        3) Other Energy Related Businesses. Other Energy Related
                        Businesses is an aggregation of two segments which fall
                        below the quantitative reporting thresholds: 1) Natural
                        Gas and Crude Oil Marketing and Transportation - markets
                        and transports its own and third-party natural gas and
                        crude oil in the United States; and 2) Power Generation
                        - develops, constructs and operates independent electric
                        power projects worldwide.

                             Revenues by product line are:



                        (In millions)                                                            2000         1999         1998
                        ----------------------------------------------------------------------------------------------------------
                                                                                                               
                        Refined products                                                     $  22,514    $  15,181     $ 12,852
                        Merchandise                                                              2,441        2,194        1,941
                        Liquid hydrocarbons                                                      6,856        4,587        5,023
                        Natural gas                                                              2,518        1,429        1,187
                        Transportation and other products                                          158          199          271
                        ----------------------------------------------------------------------------------------------------------


M-10


     Segment income represents income from operations allocable to operating
segments. USX corporate general and administrative costs are not allocated to
operating segments. These costs primarily consist of employment costs including
pension effects, professional services, facilities and other related costs
associated with corporate activities. Certain general and administrative costs
related to all Marathon Group operating segments in excess of amounts billed to
MAP under service contracts and amounts charged out to operating segments under
Marathon's shared services procedures also are not allocated to operating
segments. Additionally, the following items are not allocated to operating
segments: inventory market valuation adjustments, gain on ownership change in
MAP and certain other items not allocated to operating segments for business
performance reporting purposes (see (a) in reconcilement table on page M-12).
     Information on assets by segment is not provided as it is not reviewed by
the chief operating decision maker.



                                                                                     Refining,             Other
                                                               Exploration           Marketing            Energy
                                                                   and                  and               Related
(In millions)                                                   Production         Transportation       Businesses       Total
---------------------------------------------------------------------------------------------------------------------------------
                                                                                                            
2000
Revenues and other income:
   Customer                                                      $   4,184           $  28,693          $    1,550      $  34,427
   Intersegment/(a)/                                                   412                  83                  78            573
   Intergroup/(a)/                                                      30                   1                  29             60
   Equity in earnings of unconsolidated investees                       47                  22                  15             84
   Other                                                                21                  50                  12             83
                                                                 ---------           ---------          ----------      ---------
     Total revenues and other income                             $   4,694           $  28,849          $    1,684      $  35,227
                                                                 =========           =========          ==========      =========
Segment income                                                   $   1,535           $   1,273          $       38        $ 2,846
Significant noncash items included in segment income -
  Depreciation, depletion and amortization/(b)/                        723                 315                   3          1,041
Capital expenditures/(c)/                                              742                 656                   2          1,400
---------------------------------------------------------------------------------------------------------------------------------
1999
Revenues and other income:
   Customer                                                      $   2,856           $  19,962          $      731      $  23,549
   Intersegment(a)                                                     202                  47                  40            289
   Intergroup(a)                                                        19                   -                  22             41
   Equity in earnings (losses) of unconsolidated investees              (2)                 17                  26             41
   Other                                                                30                  50                  15             95
                                                                 ---------           ---------          ----------      ---------
     Total revenues and other income                             $   3,105           $  20,076          $      834      $  24,015
                                                                 =========           =========          ==========      =========
Segment income                                                   $     618           $     611          $       61        $ 1,290
Significant noncash items included in segment income -
  Depreciation, depletion and amortization/(b)/                        638                 280                   5            923
Capital expenditures/(c)/                                              744                 612                   4          1,360
---------------------------------------------------------------------------------------------------------------------------------
1998
Revenues and other income:
   Customer                                                      $   1,905           $  19,018          $      306      $  21,229
   Intersegment/(a)/                                                   144                  10                  17            171
   Intergroup/(a)/                                                      13                   -                   7             20
   Equity in earnings of unconsolidated investees                        2                  12                  14             28
   Other                                                                26                  40                  11             77
                                                                 ---------           ---------          ----------      ---------
     Total revenues and other income                             $   2,090           $  19,080          $      355      $  21,525
                                                                 =========           =========          ==========      =========
Segment income                                                   $     278           $     896          $       33      $   1,207
Significant noncash items included in segment income -
  Depreciation, depletion and amortization/(b)/                        581                 272                   6            859
Capital expenditures/(c)/                                              839                 410                   8          1,257
---------------------------------------------------------------------------------------------------------------------------------


/(a)/ Intersegment and intergroup revenues and transfers were conducted under
      terms comparable to those with unrelated parties.
/(b)/ Differences between segment totals and group totals represent amounts
      included in administrative expenses and international and domestic oil and
      gas property impairments.
/(c)/ Differences between segment totals and group totals represent amounts
      related to corporate administrative activities.

                                                                            M-11


     The following schedules reconcile segment amounts to amounts reported in
the Marathon Group financial statements:



(In millions)                                                                          2000              1999           1998
-------------------------------------------------------------------------------------------------------------------------------
                                                                                                              
Revenues and Other Income:
  Revenues and other income of reportable segments                                  $   35,227        $   24,015       $ 21,525
  Items not allocated to segments:
   Joint venture formation charges                                                        (931)                -              -
   Gain on ownership change in MAP                                                          12                17            245
   Other                                                                                   124               (36)            24
  Elimination of intersegment revenues                                                    (573)             (289)          (171)
                                                                                    ----------        ----------       --------
     Total Group revenues and other income                                          $   33,859        $   23,707       $ 21,623
                                                                                    ==========        ==========       ========
Income:
  Income for reportable segments                                                    $    2,846        $    1,290       $  1,207
  Items not allocated to segments:
   Joint venture formation charges                                                        (931)                -              -
   Gain on ownership change in MAP                                                          12                17            245
   Administrative expenses                                                                (136)             (108)          (106)
   Inventory market valuation adjustments                                                    -               551           (267)
   Other/(a)/                                                                             (143)              (37)          (141)
                                                                                    ----------        ----------       --------
     Total Group income from operations                                             $    1,648        $    1,713       $    938
-------------------------------------------------------------------------------------------------------------------------------


/(a)/ Represents in 2000, certain oil and gas property impairments, net gains on
      certain asset sales and reorganization charges. Represents in 1999,
      primarily certain domestic oil and gas property impairments, net losses on
      certain asset sales and costs of a voluntary early retirement program.
      Represents in 1998, certain international oil and gas property
      impairments, certain suspended exploration well write-offs, a gas contract
      settlement and MAP transition charges.

Geographic Area:

      The information below summarizes the operations in different geographic
areas. Transfers between geographic areas are at prices which approximate
market.



                                                                           Revenues and Other Income
                                                             --------------------------------------------------
                                                               Within               Between
(In millions)                                Year          Geographic Areas     Geographic Areas         Total       Assets/(a)/
--------------------------------------------------------------------------------------------------------------------------------
                                                                                                      
United States                                2000             $  32,239           $        -         $   32,239      $     6,711
                                             1999                22,716                    -             22,716            7,555
                                             1998                20,837                    -             20,837            7,659
Canada                                       2000                   856                  899              1,755              940
                                             1999                   426                  521                947            1,112
                                             1998                   209                  368                577            1,094
United Kingdom                               2000                   567                    -                567            1,698
                                             1999                   459                    -                459            1,581
                                             1998                   462                    -                462            1,739
Other Foreign Countries                      2000                   197                  188                385              310
                                             1999                   106                   88                194              735
                                             1998                   115                   52                167              468
Eliminations                                 2000                     -               (1,087)            (1,087)               -
                                             1999                     -                 (609)              (609)               -
                                             1998                     -                 (420)              (420)               -
     Total                                   2000             $  33,859           $        -         $   33,859      $     9,659
                                             1999                23,707                    -             23,707           10,983
                                             1998                21,623                    -             21,623           10,960
--------------------------------------------------------------------------------------------------------------------------------


/(a)/ Includes property, plant and equipment and investments.

--------------------------------------------------------------------------------
11. Leases
                    Future minimum commitments for capital leases (including
                    sale-leasebacks accounted for as financings) and for
                    operating leases having remaining noncancelable lease terms
                    in excess of one year are as follows:



                                                                                                       Capital    Operating
                    (In millions)                                                                      Leases       Leases
---------------------------------------------------------------------------------------------------------------------------
                                                                                                             
                        2001                                                                           $     1     $     94
                        2002                                                                                 1           83
                        2003                                                                                 1           58
                        2004                                                                                 1           50
                        2005                                                                                 1          112
                        Later years                                                                          5          109
                        Sublease rentals                                                                     -          (18)
                                                                                                     ---------     --------
                              Total minimum lease payments                                                  10     $    488
                                                                                                                   ========
                        Less imputed interest costs                                                          3
                                                                                                     ---------
                              Present value of net minimum lease payments
                               included in long-term debt                                            $       7
---------------------------------------------------------------------------------------------------------------------------




                             Operating lease rental expense:
                        (In millions)                                                    2000          1999          1998
---------------------------------------------------------------------------------------------------------------------------
                                                                                                          
                        Minimum rental                                                 $    156      $     149     $    157
                        Contingent rental                                                    13             11           10
                        Sublease rentals                                                    (13)           (13)          (7)
                                                                                       --------      ---------     --------
                               Net rental expense                                      $    156      $     147     $    160
---------------------------------------------------------------------------------------------------------------------------


                                                                            M-12


                         The Marathon Group leases a wide variety of facilities
                    and equipment under operating leases, including land and
                    building space, office equipment, production facilities and
                    transportation equipment. Most long-term leases include
                    renewal options and, in certain leases, purchase options. In
                    the event of a change in control of USX, as defined in the
                    agreements, or certain other circumstances, operating lease
                    obligations totaling $104 million may be declared
                    immediately due and payable.

--------------------------------------------------------------------------------
12. Long-Term Debt

                    The Marathon Group's portion of USX's consolidated long-term
                    debt is as follows:



                                                                                     Marathon Group        Consolidated USX/(a)/
                                                                                  --------------------     ---------------------
                    (In millions)                     December 31                   2000        1999           2000       1999
                    ------------------------------------------------------------------------------------------------------------
                                                                                                             
                    Specifically attributed debt/(b)/:
                     Receivables facility                                         $      -    $      -       $    350    $   350
                     Sale-leaseback financing and capital leases                         7          15             95        107
                     Other                                                               1           1              4          1
                                                                                  --------    --------       --------    -------
                          Total                                                          8          16            449        458
                     Less amount due within one year                                     1           1             10          7
                                                                                  --------    --------       --------    -------
                          Total specifically attributed long-term debt            $      7    $     15       $    439    $   451
--------------------------------------------------------------------------------------------------------------------------------
                    Debt attributed to groups/(c)/                                $  2,090    $  3,375       $  4,036    $ 3,852
                     Less unamortized discount                                          13          23             25         27
                     Less amount due within one year                                   147          47            277         54
                                                                                  --------    --------       --------   --------
                          Total long-term debt attributed to groups               $  1,930    $  3,305       $  3,734    $ 3,771
--------------------------------------------------------------------------------------------------------------------------------
                    Total long-term debt due within one year                      $    148    $     48       $    287    $    61
                    Total long-term debt due after one year                          1,937       3,320          4,173      4,222
--------------------------------------------------------------------------------------------------------------------------------


                    /(a)/  See Note 14, to the USX consolidated financial
                           statements for details of interest rates, maturities
                           and other terms of long-term debt.
                    /(b)/  As described in Note 4, certain financial activities
                           are specifically attributed only to the Marathon
                           Group and the U. S. Steel Group.
                    /(c)/  Most long-term debt activities of USX Corporation and
                           its wholly owned subsidiaries are attributed to all
                           groups (in total, but not with respect to specific
                           debt issues) based on their respective cash flows
                           (Notes 4, 9 and 13).

-------------------------------------------------------------------------------
13. Supplemental Cash Flow Information



                    (In millions)                                                                2000         1999        1998
                    ------------------------------------------------------------------------------------------------------------
                                                                                                              
                    Cash used in operating activities included:
                     Interest and other financial costs paid (net of amount capitalized)     $     (270)  $     (289)   $   (260)
                         Income taxes paid, including settlements with the
                           U. S. Steel Group                                                       (468)        (101)       (154)
                    ------------------------------------------------------------------------------------------------------------
                    USX debt attributed to all groups - net:
                     Commercial paper  - issued                                              $    3,362   $    6,282    $      -
                                       - repayments                                              (3,450)      (6,117)          -
                     Credit agreements - borrowings                                                 437        5,529      17,486
                                       - repayments                                                (437)      (5,980)    (16,817)
                     Other credit arrangements - net                                                150          (95)         55
                     Other debt - borrowings                                                          -          319         671
                                - repayments                                                        (54)         (87)     (1,053)
                                                                                             ----------   ----------    --------
                         Total                                                               $        8   $     (149)   $    342
                    ------------------------------------------------------------------------------------------------------------
                         Marathon Group activity                                             $   (1,200)  $     (296)        329
                         U. S. Steel Group activity                                               1,208          147          13
                                                                                             ----------   ----------    ---------
                              Total                                                          $        8   $     (149)   $    342
                    --------------------------------------------------------------------------------------------------------------
                        Noncash investing and financing activities:
                         Marathon Stock issued for dividend reinvestment and
                           employee stock plans                                              $       10   $        4    $      3
                         Marathon Stock issued for Exchangeable Shares                                -            7          11
                         Investee preferred stock received in conversion of investee loan             -          142           -
                         Disposal of assets:
                           Exchange of Sakhalin Energy Investment Company Ltd.                      410            -           -
                           Notes received                                                             6           19           -
                         Business combinations:
                           Acquisition of Tarragon:
                            Exchangeable Shares issued                                                -            -          29
                            Liabilities assumed                                                       -            -         433
                           Acquisition of Ashland RM&T net assets:
                            38% interest in MAP                                                       -            -       1,900
                            Liabilities assumed                                                       -            -       1,038
                           Other acquisitions - liabilities assumed                                   -           16           -
                    ------------------------------------------------------------------------------------------------------------


                                                                            M-13


--------------------------------------------------------------------------------
14. Pensions and Other Postretirement Benefits

                    The Marathon Group has noncontributory defined benefit
                    pension plans covering substantially all employees. Benefits
                    under these plans are based primarily upon years of service
                    and final average pensionable earnings. Certain subsidiaries
                    provide benefits for employees covered by other plans based
                    primarily upon employees' service and career earnings.
                         The Marathon Group also has defined benefit retiree
                    health care and life insurance plans (other benefits)
                    covering most employees upon their retirement. Health care
                    benefits are provided through comprehensive hospital,
                    surgical and major medical benefit provisions or through
                    health maintenance organizations, both subject to various
                    cost sharing features. Life insurance benefits are provided
                    to certain nonunion and most union represented retiree
                    beneficiaries primarily based on employees' annual base
                    salary at retirement. Other benefits have not been
                    prefunded.



                                                                                     Pension Benefits            Other Benefits
                                                                                  ---------------------       ------------------
                    (In millions)                                                    2000         1999          2000        1999
                    ------------------------------------------------------------------------------------------------------------
                                                                                                            
                    Change in benefit obligations
                    Benefit obligations at January 1                              $     868      $1,080       $    478   $   597
                    Service cost                                                         52          65             14        17
                    Interest cost                                                        67          67             37        36
                    Plan amendments                                                       6          18              1       (44)
                    Actuarial (gains) losses                                            121        (197)            46      (108)
                    Plan merger and acquisition                                           -          14              -         4
                    Settlements, curtailments and termination benefits                  (99)       (122)            22         -
                    Benefits paid                                                       (77)        (57)           (23)      (24)
                                                                                  ---------      ------       ---------  -------
                    Benefit obligations at December 31                            $     938      $  868       $    575   $   478
                    ------------------------------------------------------------------------------------------------------------
                    Change in plan assets
                    Fair value of plan assets at January 1                        $   1,310      $1,331
                    Actual return on plan assets                                         (8)        136
                    Plan merger and acquisition                                           -          12
                    Employer contributions                                                1           2
                    Trustee distributions/(a)/                                          (18)        (16)
                    Settlements paid                                                   (134)        (99)
                    Benefits paid from plan assets                                      (72)        (56)
                                                                                  ---------      ------
                    Fair value of plan assets at December 31                      $   1,079      $1,310
                    ------------------------------------------------------------------------------------------------------------
                    Funded status of plans at December 31                         $     141/(b)/ $  442/(b)/     $(575)  $  (478)
                    Unrecognized net gain from transition                               (18)        (26)             -         -
                    Unrecognized prior service costs (credits)                           59          63            (59)      (72)
                    Unrecognized actuarial (gains) losses                               (37)       (306)           115        68
                    Additional minimum liability                                        (19)         (8)             -         -
                                                                                  ---------      ------       --------   -------
                    Prepaid (accrued) benefit cost                                $     126      $  165       $   (519)  $  (482)
                    ------------------------------------------------------------------------------------------------------------

                    /(a)/ Represents transfers of excess pension assets to fund
                          retiree health care benefits accounts under Section
                          420 of the Internal Revenue Code.
                    /(b)/ Includes several plans that have accumulated benefit
                          obligations in excess of plan assets:



                                                                                                                     
                          Aggregate accumulated benefit obligations                                            $   (34)    $   (24)
                          Aggregate projected benefit obligations                                                  (43)        (37)
                          Aggregate plan assets                                                                      -           -
----------------------------------------------------------------------------------------------------------------------------------




                                                                            Pension Benefits                Other Benefits
                                                                      -----------------------------  ------------------------------
                    (In millions)                                       2000        1999      1998        2000        1999     1998
                    ---------------------------------------------------------------------------------------------------------------
                                                                                                           
                    Components of net periodic
                     benefit cost (credit)
                    Service cost                                     $    52      $  65       $  48     $  14       $  17    $  12
                    Interest cost                                         67         67          57        37          36       31
                    Expected return on plan assets                      (117)      (114)       (107)        -           -        -
                    Amortization - net transition gain                    (4)        (5)         (5)        -           -        -
                                 - prior service costs (credits)           4          4           3       (10)         (8)      (3)
                                 - actuarial (gains) losses               (9)         1           -         3           7        3
                    Multiemployer and other plans                          5          5           5         -           -        -
                    Settlement and termination (gain) loss                32/(a)/    (7)/(a)/     -        21/(a)/      -        -
                                                                     -------      -----       -----     -----       -----    -----
                    Net periodic benefit cost                        $    30      $  16       $   1     $  65       $  52    $  43
                    ---------------------------------------------------------------------------------------------------------------

                    /(a)/  Includes voluntary early retirement programs.



                                                                                      Pension Benefits          Other Benefits
                                                                                  ---------------------     ----------------------
                                                                                   2000        1999         2000         1999
                    --------------------------------------------------------------------------------------------------------------
                                                                                                            
                    Weighted average actuarial assumptions at December 31:
                    Discount rate                                                  7.5%        8.0%          7.5%        8.0%
                    Expected annual return on plan assets                          9.5%        9.5%          n/a         n/a
                    Increase in compensation rate                                  5.0%        5.0%          5.0%        5.0%
                    --------------------------------------------------------------------------------------------------------------


M-14


                              For measurement purposes, an 8% annual rate of
                        increase in the per capita cost of covered health care
                        benefits was assumed for 2001. The rate was assumed to
                        decrease gradually to 5% for 2007 and remain at that
                        level thereafter.
                              A one-percentage-point change in assumed health
                        care cost trend rates would have the following effects:



                                                                                                 1-Percentage-      1-Percentage-
                        (In millions)                                                           Point Increase     Point Decrease
                        ----------------------------------------------------------------------------------------------------------
                                                                                                            
                        Effect on total of service and interest cost components                    $     9          $      (7)
                        Effect on other postretirement benefit obligations                              71                (58)
                        ----------------------------------------------------------------------------------------------------------


--------------------------------------------------------------------------------
15. Dividends

                        In accordance with the USX Restated Certificate of
                        Incorporation, dividends on the Marathon Stock and Steel
                        Stock are limited to the legally available funds of USX.
                        Net losses of either Group, as well as dividends and
                        distributions on any class of USX Common Stock or series
                        of preferred stock and repurchases of any class of USX
                        Common Stock or series of preferred stock at prices in
                        excess of par or stated value, will reduce the funds of
                        USX legally available for payment of dividends on both
                        classes of Common Stock. Subject to this limitation, the
                        Board of Directors intends to declare and pay dividends
                        on the Marathon Stock based on the financial condition
                        and results of operations of the Marathon Group,
                        although it has no obligation under Delaware law to do
                        so. In making its dividend decisions with respect to
                        Marathon Stock, the Board of Directors considers among
                        other things, the long-term earnings and cash flow
                        capabilities of the Marathon Group as well as the
                        dividend policies of similar publicly traded energy
                        companies.

--------------------------------------------------------------------------------
16. Property, Plant and Equipment



                        (In millions)                                                 December 31            2000           1999
                        ----------------------------------------------------------------------------------------------------------
                                                                                                                  
                        Production                                                                        $  12,266     $   14,568
                        Refining                                                                              2,800          2,439
                        Marketing                                                                             2,286          2,197
                        Transportation                                                                        1,402          1,374
                        Other                                                                                   312            282
                                                                                                          ---------     ----------
                              Total                                                                          19,066         20,860
                        Less accumulated depreciation, depletion and amortization                             9,691         10,567
                                                                                                          ---------     ----------
                              Net                                                                         $   9,375     $   10,293
                        ----------------------------------------------------------------------------------------------------------


                              Property, plant and equipment at December 31, 2000
                        and 1999, includes gross assets acquired under capital
                        leases of $8 million and $20 million, respectively, with
                        no related amounts in accumulated depreciation,
                        depletion and amortization.
                              During 2000, the Marathon Group recorded $193
                        million of impairments of certain E&P segment oil and
                        gas properties, primarily located in Canada. The
                        impairments were recorded due to reserve revisions as a
                        result of production performance and disappointing
                        drilling results. The fair value of the properties was
                        determined using a discounted cash flow model, unless an
                        indicative offer to purchase was available. The Marathon
                        Group used pricing assumptions based on forecasted
                        prices applicable for the remaining life of the assets
                        derived from current market conditions and long-term
                        forecasts. The discounted cash flow calculation included
                        risk-adjusted probable and possible reserve quantities.
                              In 1998, the Marathon Group recorded a $60 million
                        impairment charge on its oil and gas properties in
                        Libya. The deterioration of U.S. relations with Libya at
                        the time created an unstable environment that caused the
                        Marathon Group to reevaluate its stance with its
                        investment in Libya. The Marathon Group impaired the
                        value of these assets because it could not reasonably
                        predict with a high degree of certainty if government
                        sanctions which prevented the Marathon Group from
                        operating these assets would ever be lifted.
                              All impairment charges were included in
                        depreciation, depletion and amortization.

                                                                            M-15


--------------------------------------------------------------------------------
17. Common Stockholders' Equity



                        (In millions, except per share data)                                     2000        1999          1998
                        --------------------------------------------------------------------------------------------------------
                                                                                                               
                        Balance at beginning of year                                         $   4,800     $  4,312     $  3,618
                         Net income                                                                432          654          310
                         Marathon Stock - issued                                                     9           96          617
                                        - repurchased                                             (105)           -            -
                         Treasury stock reissued                                                     1            -            -
                         Exchangeable Shares - issued                                                -            -           29
                                             - exchanged for Marathon Stock                          -           (7)         (12)
                         Dividends on Marathon Stock
                           (per share $.88 in 2000 and $.84 in 1999 and 1998)                     (274)        (261)        (248)
                         Deferred compensation                                                      (5)           -            2
                         Accumulated other comprehensive income (loss)/(a)/:
                           Foreign currency translation adjustments                                  1           (1)           2
                           Minimum pension liability adjustments (Note 14)                         (14)           7           (3)
                           Unrealized holding losses on investments                                  -            -           (3)
                                                                                             ---------     --------     --------
                        Balance at end of year                                               $   4,845     $  4,800     $  4,312
                        --------------------------------------------------------------------------------------------------------


                        /(a)/ See page U-7 of the USX consolidated financial
                              statements relative to the annual activity of
                              these adjustments and losses. Total comprehensive
                              income for the Marathon Group for the years 2000,
                              1999 and 1998 was $419 million, $660 million and
                              $306 million, respectively.

--------------------------------------------------------------------------------
18. Income Taxes

                        Income tax provisions and related assets and liabilities
                        attributed to the Marathon Group are determined in
                        accordance with the USX group tax allocation policy
                        (Note 4).
                             Provisions (credits) for income taxes were:



                                                        2000                          1999                          1998
                                           ----------------------------     ------------------------     ------------------------
                        (In millions)       Current   Deferred    Total     Current Deferred   Total     Current Deferred  Total
                        ---------------------------------------------------------------------------------------------------------
                                                                                                
                        Federal             $ 614     $ (144)    $ 470       $191    $ 158    $ 349       $  83    $  19   $  102
                        State and local        53        (46)        7          3       (7)      (4)         30        9       39
                        Foreign                55        (50)        5         25      (46)     (21)          3       (2)       1
                                            -----     ------     -----       ----    -----    -----       -----    -----   ------
                              Total         $ 722     $ (240)    $ 482       $219    $ 105    $ 324       $ 116    $  26   $  142
                        ---------------------------------------------------------------------------------------------------------


                        A reconciliation of federal statutory tax rate (35%) to
                        total provisions follows:



                        (In millions)                                                         2000         1999           1998
                        --------------------------------------------------------------------------------------------------------
                                                                                                                
                        Statutory rate applied to income before income taxes               $    320    $     342         $   158
                        Effects of foreign operations:
                         Impairment of deferred tax benefits                                    235            -               -
                         Adjustments to foreign valuation allowances                            (30)           -               -
                         All other, including foreign tax credits                               (30)         (18)            (26)
                        State and local income taxes after federal income tax effects             5           (3)             25
                        Credits other than foreign tax credits                                   (7)          (7)             (9)
                        Effects of partially owned companies                                     (5)          (5)             (4)
                        Dispositions of subsidiary investments                                    -            7               -
                        Adjustment of prior years' federal income taxes                         (11)           4              (5)
                        Other                                                                     5            4               3
                                                                                           --------    ---------         -------
                              Total provisions                                             $    482    $     324         $   142
                        --------------------------------------------------------------------------------------------------------


M-16


     Deferred tax assets and liabilities resulted from the following:



(In millions)                                                 December 31               2000          1999
---------------------------------------------------------------------------------------------------------------
                                                                                            
Deferred tax assets:
 State tax loss carryforwards (expiring in 2001 through 2020)                        $       70   $       57
 Foreign tax loss carryforwards (portion of which expire in 2001 through 2015)              269          408
 Employee benefits                                                                          246          206
 Receivables, payables and debt                                                              41           14
 Expected federal benefit for:
   Crediting certain foreign deferred income taxes                                          315          530
   Deducting state deferred income taxes                                                     20           36
 Contingency and other accruals                                                             155          150
 Investments in foreign subsidiaries                                                         39           52
 Investments in subsidiaries and equity investees                                            30           20
 Other                                                                                       60           34
 Valuation allowances:
   Federal                                                                                    -          (30)
   State                                                                                    (16)         (11)
   Foreign                                                                                 (252)        (282)
                                                                                       ---------    ---------
      Total deferred tax assets/(a)/                                                        977        1,184
                                                                                       ---------    ---------
Deferred tax liabilities:
 Property, plant and equipment                                                            1,642        2,091
 Inventory                                                                                  320          324
 Prepaid pensions                                                                           119          127
 Other                                                                                      160          111
                                                                                       ---------    ---------
      Total deferred tax liabilities                                                      2,241        2,653
                                                                                       ---------    ---------
       Net deferred tax liabilities                                                  $    1,264   $    1,469
---------------------------------------------------------------------------------------------------------------


/(a)/ USX expects to generate sufficient future taxable income to realize the
      benefit of the Marathon Group's deferred tax assets. In addition, the
      ability to realize the benefit of foreign tax credits is based upon
      certain assumptions concerning future operating conditions (particularly
      as related to prevailing oil prices), income generated from foreign
      sources and USX's tax profile in the years that such credits may be
      claimed. During 2000, the amount of net deferred tax assets expected to be
      realized was reduced as a result of the change in the amount and timing of
      future foreign source income due to the exchange of Marathon's interest in
      Sakhalin Energy Investment Company Ltd. for other oil and gas producing
      interests. Additionally, gross deferred tax assets and the associated
      valuation allowance were reduced by a change in management's intent
      regarding the permanent reinvestment of the earnings from certain foreign
      subsidiaries.

     The consolidated tax returns of USX for the years 1990 through 1997 are
under various stages of audit and administrative review by the IRS. USX believes
it has made adequate provision for income taxes and interest which may become
payable for years not yet settled.
     Pretax income (loss) included $237 million, $66 million and $(75) million
attributable to foreign sources in 2000, 1999 and 1998, respectively.
     Undistributed earnings of certain consolidated foreign subsidiaries at
December 31, 2000, amounted to $205 million. No provision for deferred U.S.
income taxes has been made for these subsidiaries because the Marathon Group
intends to permanently reinvest such earnings in those foreign operations. If
such earnings were not permanently reinvested, a deferred tax liability of $72
million would have been required.

                                                                            M-17


--------------------------------------------------------------------------------
19. Investments and Long-Term Receivables



                        (In millions)                                                 December 31           2000         1999
                        ----------------------------------------------------------------------------------------------------------
                                                                                                                
                        Equity method investments                                                       $      250    $     658
                        Other investments                                                                       34           32
                        Receivables due after one year                                                          54           46
                        Deposits of restricted cash                                                             16           20
                        Other                                                                                   86            6
                                                                                                          ---------    ---------
                              Total                                                                     $      362    $     762
                        ----------------------------------------------------------------------------------------------------------


                             Summarized financial information of investees
                        accounted for by the equity method of accounting
                        follows:


                        (In millions)                                                          2000         1999         1998
                        ----------------------------------------------------------------------------------------------------------
                                                                                                             
                        Income data - year:
                         Revenues and other income                                         $     417    $      422    $     347
                         Operating income                                                        174           152          132
                         Net income                                                              123           119           79
                        ----------------------------------------------------------------------------------------------------------
                        Balance sheet data - December 31:
                         Current assets                                                    $     328    $      387
                         Noncurrent assets                                                     1,247         2,606
                         Current liabilities                                                     256           300
                         Noncurrent liabilities                                                  650         1,066
                        ----------------------------------------------------------------------------------------------------------


                             In 2000, Marathon exchanged its investment in
                        Sakhalin Energy for a working interest in the Foinaven
                        field located in the Atlantic Margin offshore the United
                        Kingdom and an overriding royalty interest in an eight
                        block area in the Gulf of Mexico, which includes the
                        Ursa field. Additionally, Marathon received
                        reimbursement for amounts advanced to Sakhalin Energy in
                        2000 and a cash settlement for certain other activities
                        in 2000. The transaction was recorded at fair value and
                        resulted in a pretax gain on disposal of assets of $58
                        million.
                             Dividends and partnership distributions received
                        from equity investees were $46 million in 2000, $44
                        million in 1999 and $23 million in 1998.
                             Marathon Group purchases from equity investees
                        totaled $61 million, $50 million and $64 million in
                        2000, 1999 and 1998, respectively. Marathon Group
                        revenues for sales to USX equity investees were $28
                        million in 2000 and $22 million in 1999 and 1998.


--------------------------------------------------------------------------------
20. Inventories



                        (In millions)                                                 December 31             2000         1999
                        ------------------------------------------------------------------------------------------------------------
                                                                                                                 
                        Crude oil and natural gas liquids                                                 $     701    $     729
                        Refined products and merchandise                                                      1,069        1,046
                        Supplies and sundry items                                                                97          109
                                                                                                           ---------    ---------
                              Total (at cost)                                                                 1,867        1,884
                        Less inventory market valuation reserve                                                   -            -
                                                                                                           ---------    ---------
                              Net inventory carrying value                                                $   1,867    $   1,884
                        -----------------------------------------------------------------------------------------------------------


                             Inventories of crude oil and refined products are
                        valued by the LIFO method. The LIFO method accounted for
                        92% and 90% of total inventory value at December 31,
                        2000 and 1999, respectively. Current acquisition costs
                        were estimated to exceed the above inventory values at
                        December 31, by approximately $500 million and $200
                        million in 2000 and 1999, respectively. Cost of revenues
                        was reduced and income from operations was increased by
                        $14 million in 2000 as a result of liquidations of LIFO
                        inventories.
                             The inventory market valuation reserve reflects the
                        extent that the recorded LIFO cost basis of crude oil
                        and refined products inventories exceeds net realizable
                        value. The reserve is decreased to reflect increases in
                        market prices and inventory turnover and increased to
                        reflect decreases in market prices. Changes in the
                        inventory market valuation reserve result in noncash
                        charges or credits to costs and expenses. During 2000,
                        there were no charges or credits to costs and expenses.

--------------------------------------------------------------------------------
21. Stock-Based Compensation Plans and Stockholder Rights Plan

                        USX Stock-Based Compensation Plans and Stockholder
                        Rights Plan are discussed in Note 17, and Note 19,
                        respectively, to the USX consolidated financial
                        statements.
                             The Marathon Group's actual stock-based
                        compensation expense (credit) was $5 million in 2000,
                        $(4) million in 1999 and $(3) million in 1998.
                        Incremental compensation expense, as determined under a
                        fair value model, was not material ($.02 or less per
                        share for all years presented). Therefore, pro forma net
                        income and earnings per share data have been omitted.

M-18


--------------------------------------------------------------------------------
22. Fair Value of Financial Instruments

                        Fair value of the financial instruments disclosed herein
                        is not necessarily representative of the amount that
                        could be realized or settled, nor does the fair value
                        amount consider the tax consequences of realization or
                        settlement. The following table summarizes financial
                        instruments, excluding derivative financial instruments
                        disclosed in Note 24, by individual balance sheet
                        account. As described in Note 4, the Marathon Group's
                        specifically attributed financial instruments and the
                        Marathon Group's portion of USX's financial instruments
                        attributed to all groups are as follows:



                                                                                              2000                   1999
                                                                                       -------------------    -------------------
                                                                                        Fair     Carrying      Fair      Carrying
                        (In millions)                    December 31                    Value     Amount       Value      Amount
                        ----------------------------------------------------------------------------------------------------------
                                                                                                            
                        Financial assets:
                         Cash and cash equivalents                                   $    340    $    340    $    111   $    111
                         Receivables                                                    2,267       2,267       1,887      1,887
                         Investments and long-term receivables                            171         107         166        109
                                                                                      --------    --------    --------    --------
                               Total financial assets                                $  2,778    $  2,714    $  2,164   $  2,107
                        ----------------------------------------------------------------------------------------------------------
                        Financial liabilities:
                         Notes payable                                               $     80    $     80    $      -   $      -
                         Accounts payable (including intergroup payables)               3,385       3,385       2,751      2,751
                         Accrued interest                                                  61          61          92         92
                         Long-term debt (including amounts due within one year)         2,174       2,078       3,443      3,353
                         Preferred stock of subsidiary                                    175         184         176        184
                                                                                      --------    --------    --------    --------
                               Total financial liabilities                           $  5,875    $  5,788    $  6,462   $  6,380
                        ----------------------------------------------------------------------------------------------------------


                             Fair value of financial instruments classified as
                        current assets or liabilities approximates carrying
                        value due to the short-term maturity of the instruments.
                        Fair value of investments and long-term receivables was
                        based on discounted cash flows or other specific
                        instrument analysis. Fair value of preferred stock of
                        subsidiary was based on market prices. Fair value of
                        long-term debt instruments was based on market prices
                        where available or current borrowing rates available for
                        financings with similar terms and maturities.
                             The Marathon Group's only unrecognized financial
                        instruments are financial guarantees and commitments to
                        extend credit. It is not practicable to estimate the
                        fair value of these forms of financial instrument
                        obligations because there are no quoted market prices
                        for transactions which are similar in nature. For
                        details relating to financial guarantees, see Note 25.

--------------------------------------------------------------------------------
23. Intergroup Transactions

                        Revenues and purchases - Marathon Group revenues for
                        sales to the U. S. Steel Group totaled $60 million, $41
                        million and $21 million in 2000, 1999 and 1998,
                        respectively. Marathon Group purchases from the U. S.
                        Steel Group totaled $17 million in both 2000 and 1999
                        and $2 million in 1998. At December 31, 2000 and 1999,
                        Marathon Group receivables included $1 million and $5
                        million, respectively, related to transactions with the
                        U. S. Steel Group. At December 31, 2000 and 1999,
                        Marathon Group accounts payable included $2 million
                        related to transactions with the U. S. Steel Group.
                        These transactions were conducted under terms comparable
                        to those with unrelated parties.

                        Income taxes receivable from/payable to the U. S. Steel
                        Group - At December 31, 2000 and 1999, amounts
                        receivable or payable for income taxes were included in
                        the balance sheet as follows:



                        (In millions)                                                 December 31             2000         1999
                        ----------------------------------------------------------------------------------------------------------
                                                                                                                  
                        Current:
                         Receivables                                                                      $       4     $      1
                         Income taxes payable                                                                   364           97
                        Noncurrent:
                         Deferred credits and other liabilities                                                  97           97
                        ----------------------------------------------------------------------------------------------------------


                             These amounts have been determined in accordance
                        with the tax allocation policy described in Note 4.
                        Amounts classified as current are settled in cash in the
                        year succeeding that in which such amounts are accrued.
                        Noncurrent amounts represent estimates of intergroup tax
                        effects of certain issues for years that are still under
                        various stages of audit and administrative review. Such
                        tax effects are not settled between the groups until the
                        audit of those respective tax years is closed. The
                        amounts ultimately settled for open tax years will be
                        different than recorded noncurrent amounts based on the
                        final resolution of all of the audit issues for those
                        years.

                                                                            M-19


--------------------------------------------------------------------------------
24. Derivative Instruments

                        The Marathon Group remains at risk for possible changes
                        in the market value of derivative instruments; however,
                        such risk should be mitigated by price changes in the
                        underlying hedged item. The Marathon Group is also
                        exposed to credit risk in the event of nonperformance by
                        counterparties. The credit-worthiness of counterparties
                        is subject to continuing review, including the use of
                        master netting agreements to the extent practical, and
                        full performance is anticipated.
                             The following table sets forth quantitative
                        information by class of derivative instrument:



                                                                                   Recognized
                                              Fair                 Carrying          Trading          Recorded
                                              Value                 Amount           Gain or          Deferred         Aggregate
                                             Assets                 Assets         (Loss) for          Gain or         Contract
(In millions)                             (Liabilities)/(a)(b)/  (Liabilities)     the Year           (Loss)           Values/(c)/
----------------------------------------------------------------------------------------------------------------------------------
                                                                                                     
December 31, 2000:
  Exchange-traded commodity futures:
   Trading                                  $      -              $      -          $    (19)        $      -       $         -
   Other than trading                              -                     -                 -                7               897
  Exchange-traded commodity options:
   Trading                                         -                     -                 -                -                 -
   Other than trading                             (6)/(d)/              (6)                -               (1)              971
  OTC commodity swaps/(e)/:
   Trading                                         -                     -                 -                -                 -
   Other than trading                             35/(f)/               35                 -               25               408
  OTC commodity options:
   Trading                                         -                     -                 -                -                 -
   Other than trading                            (52)/(g)/             (52)                -              (40)               94
                                             --------              --------          --------         --------          --------
      Total commodities                     $    (23)             $    (23)         $    (19)        $     (9)      $     2,370
                                             ========              ========          ========         ========          ========
  Forward exchange contracts/(h)/:
      - receivable                          $     14              $     14          $      -         $      -       $        14
----------------------------------------------------------------------------------------------------------------------------------
December 31, 1999:
  Exchange-traded commodity futures:
   Trading                                  $      -              $      -          $      4         $      -       $         8
   Other than trading                              -                     -                 -               28               344
  Exchange-traded commodity options:
   Trading                                         -                     -                 4                -               179
   Other than trading                             (6)/(d)/              (6)                -              (10)            1,262
  OTC commodity swaps:
   Trading                                         -                     -                 -                -                 -
   Other than trading                              3/(f)/                3                 -                2               156
  OTC commodity options:
   Trading                                         -                     -                 -                -                 -
   Other than trading                              4/(g)/                4                 -                5               238
                                             --------              --------          --------         --------          --------
      Total commodities                     $      1              $      1          $      8         $     25       $     2,187
                                             ========              ========          ========         ========          ========
  Forward exchange contracts:
      - receivable                          $     52              $     52          $      -         $      -       $        51
----------------------------------------------------------------------------------------------------------------------------------


/(a)/ The fair value amounts for OTC positions are based on various indices or
      dealer quotes. The fair value amounts for currency contracts are based on
      dealer quotes of forward prices covering the remaining duration of the
      forward exchange contract. The exchange-traded futures contracts and
      certain option contracts do not have a corresponding fair value since
      changes in the market prices are settled on a daily basis.
/(b)/ The aggregate average fair value of all trading activities for the years
      2000 and 1999 were $(5) million and $3 million, respectively. Detail by
      class of instrument was not available.
/(c)/ Contract or notional amounts do not quantify risk exposure, but are used
      in the calculation of cash settlements under the contracts. The contract
      or notional amounts do not reflect the extent to which positions may
      offset one another.
/(d)/ Includes fair values as of December 31, 2000 and 1999, for assets of $10
      million and $11 million and for liabilities of $(16) million and $(17)
      million, respectively.
/(e)/ The OTC swap arrangements vary in duration with certain contracts
      extending into 2008.
/(f)/ Includes fair values as of December 31, 2000 and 1999, for assets of $84
      million and $8 million and for liabilities of $(49) million and $(5)
      million, respectively.
/(g)/ Includes fair values as of December 31, 2000 and 1999, for assets of
      $1 million and $5 million and for liabilities of $(53) million and $(1)
      million, respectively.
/(h)/ The forward exchange contracts relating to USX's foreign operations have
      various maturities ending in March 2001.

--------------------------------------------------------------------------------
25. Contingencies and Commitments

                        USX is the subject of, or party to, a number of pending
                        or threatened legal actions, contingencies and
                        commitments relating to the Marathon Group involving a
                        variety of matters, including laws and regulations
                        relating to the environment. Certain of these matters
                        are discussed below. The ultimate resolution of these
                        contingencies could, individually or in the aggregate,
                        be material to the Marathon Group financial statements.
                        However, management believes that USX will remain a
                        viable and competitive enterprise even though it is
                        possible that these contingencies could be resolved
                        unfavorably to the Marathon Group.

M-20


                        Environmental matters -
                             The Marathon Group is subject to federal, state,
                        local and foreign laws and regulations relating to the
                        environment. These laws generally provide for control of
                        pollutants released into the environment and require
                        responsible parties to undertake remediation of
                        hazardous waste disposal sites. Penalties may be imposed
                        for noncompliance. At December 31, 2000 and 1999,
                        accrued liabilities for remediation totaled $75 million
                        and $69 million, respectively. It is not presently
                        possible to estimate the ultimate amount of all
                        remediation costs that might be incurred or the
                        penalties that may be imposed. Receivables for
                        recoverable costs from certain states, under programs to
                        assist companies in cleanup efforts related to
                        underground storage tanks at retail marketing outlets,
                        were $57 million at December 31, 2000, and $52 million
                        at December 31, 1999.
                             For a number of years, the Marathon Group has made
                        substantial capital expenditures to bring existing
                        facilities into compliance with various laws relating to
                        the environment. In 2000 and 1999, such capital
                        expenditures totaled $73 million and $46 million,
                        respectively. The Marathon Group anticipates making
                        additional such expenditures in the future; however, the
                        exact amounts and timing of such expenditures are
                        uncertain because of the continuing evolution of
                        specific regulatory requirements.
                             At December 31, 2000 and 1999, accrued liabilities
                        for platform abandonment and dismantlement totaled $162
                        million and $152 million, respectively.

                        Guarantees -
                             Guarantees by USX and its consolidated subsidiaries
                        of the liabilities of unconsolidated entities of the
                        Marathon Group totaled $131 million at December 31,
                        1999. There were no guarantees at December 31, 2000.
                             At December 31, 2000 and 1999, the Marathon Group's
                        pro rata share of obligations of LOOP LLC and various
                        pipeline investees secured by throughput and deficiency
                        agreements totaled $119 million and $146 million,
                        respectively. Under the agreements, the Marathon Group
                        is required to advance funds if the investees are unable
                        to service debt. Any such advances are prepayments of
                        future transportation charges.

                        Commitments -
                             At December 31, 2000 and 1999, the Marathon Group's
                        contract commitments to acquire property, plant and
                        equipment and long-term investments totaled $457 million
                        and $485 million, respectively.
                             The Marathon Group is a party to a 15-year
                        transportation services agreement with a natural gas
                        transmission company. The contract requires the Marathon
                        Group to pay minimum annual demand charges of
                        approximately $5 million starting in December 2000 and
                        concluding in 2015. The payments are required even if
                        the transportation facility is not utilized. Demand
                        charges paid in 2000 were less than $1 million.

--------------------------------------------------------------------------------
26. Joint Venture Formation

                        In December 2000, Marathon and Kinder Morgan Energy
                        Partners, L.P. signed a definitive agreement to form a
                        joint venture combining certain of their oil and gas
                        producing activities in the U.S. Permian Basin,
                        including Marathon's interest in the Yates Field. This
                        transaction will allow Marathon to expand its interests
                        in the Permian Basin and will improve access to
                        materials for use in enhanced recovery techniques in the
                        Yates Field. The joint venture named MKM Partners L.P.,
                        commenced operations in January 2001 and will be
                        accounted for under the equity method of accounting.
                             As a result of the agreement to form this joint
                        venture, Marathon recognized a pretax charge of $931
                        million in the fourth quarter 2000, which is included in
                        net gains (losses) on disposal of assets, and
                        reclassified the remaining book value associated with
                        the Yates Field from property, plant and equipment to
                        assets held for sale. Upon completion of this
                        transaction in January 2001, the book value will be
                        transferred from assets held for sale to investments and
                        long-term receivables.

--------------------------------------------------------------------------------
27. Subsequent Event - Business Combination

                        On February 7, 2001, Marathon acquired 87% of the
                        outstanding common stock of Pennaco Energy Inc., a
                        natural gas producer. Marathon plans to acquire the
                        remaining Pennaco shares through a merger in which each
                        share of Pennaco common stock, not purchased in the
                        offer and not held by stockholders who have properly
                        exercised dissenters rights under Delaware law, will be
                        converted into the right to receive the tender offer
                        price in cash, without interest. The purchase price is
                        expected to approximate $500 million. The acquisition
                        will be accounted for using the purchase method of
                        accounting.

                                                                            M-21


Selected Quarterly Financial Data (Unaudited)



                                                   2000                                               1999
                              --------------------------------------------------   -----------------------------------------------
(In millions, except per
share data)                    4th Qtr.     3rd Qtr.     2nd Qtr.     1st Qtr.    4th Qtr.    3rd Qtr.    2nd Qtr.     1st Qtr.
----------------------------------------------------------------------------------------------------------------------------------
                                                                                               
Revenues and other income:
  Revenues/(a)/                $ 8,899     $ 9,169      $ 8,680      $ 7,739       $7,250      $ 6,312     $ 5,324     $ 4,704
  Other income (loss)             (833)         59           30          116           45           27          34          11
                                -------     -------      -------      -------      -------      -------     -------     -------
      Total                      8,066       9,228        8,710        7,855        7,295        6,339       5,358       4,715
Income (loss) from operations     (466)        729          860          525          350          561         399         403
  Includes:
    Joint venture
      formation charges           (931)          -            -            -            -            -           -           -
    Inventory market
      valuation credits              -           -            -            -            -          136          66         349
Net income (loss)                 (310)        121          367          254          171          230         134         119
----------------------------------------------------------------------------------------------------------------------------------
Marathon Stock data:
--------------------
Net income (loss) per share -
  Basic and diluted            $ (1.00)    $   .38      $  1.18      $   .81       $  .55      $   .74     $   .43     $   .38
Dividends paid per share           .23         .23          .21          .21          .21          .21         .21         .21
Price range of Marathon
  Stock/(b)/:
  - Low                             25-1/4      23-1/2       22-13/16     20-11/16     23-5/8       28- 1/2     25-13/16    19-5/8
  - High                            30-3/8      29-5/8       29-3/16      27-1/2       30-5/8       33-7/8      32-3/4      31-3/8
----------------------------------------------------------------------------------------------------------------------------------


/(a)/ Certain items have been reclassified between revenues and cost of
      revenues, primarily to give effect to new accounting standards as
      disclosed in Note 3 of the Notes to Financial Statements. Amounts
      reclassified in the first, second and third quarters of 2000 were $(106)
      million, $(183) million and $(59) million, respectively, and for the
      first, second, third and fourth quarters of 1999 were $(136) million,
      $(123) million, $(151) million and $(210) million, respectively.
/(b)/ Composite tape.



Principal Unconsolidated Investees (Unaudited)



                                                                          December 31, 2000
               Company                                  Country               Ownership                     Activity
----------------------------------------------------------------------------------------------------------------------------------
                                                                                            
CLAM Petroleum B.V.                                  Netherlands                 50%                 Oil & Gas Production
Kenai LNG Corporation                                United States               30%                 Natural Gas Liquification
LOCAP, Inc.                                          United States               50% /(a)/           Pipeline & Storage Facilities
LOOP LLC                                             United States               47% /(a)/           Offshore Oil Port
Manta Ray Offshore Gathering Company, LLC            United States               24%                 Natural Gas Transmission
Minnesota Pipe Line Company                          United States               33% /(a)/           Pipeline Facility
Nautilus Pipeline Company, LLC                       United States               24%                 Natural Gas Transmission
Odyssey Pipeline LLC                                 United States               29%                 Pipeline Facility
Poseidon Oil Pipeline Company, LLC                   United States               28%                 Crude Oil Transportation
----------------------------------------------------------------------------------------------------------------------------------


(a)  Represents the ownership of MAP.



Supplementary Information on Oil and Gas Producing Activities (Unaudited)

See the USX consolidated financial statements for Supplementary Information on
Oil and Gas Producing Activities relating to the Marathon Group, pages U-33
through U-38.

M-22


                        Five-Year Operating Summary



                                                                                   2000       1999       1998     1997      1996
                        --------------------------------------------------------------------------------------------------------
                                                                                                             
                        Net Liquid Hydrocarbon Production (thousands of barrels
                         per day)
                         United States (by region)
                           Alaska                                                      -         -         -         -         8
                           Gulf Coast                                                 62        74        55        29        30
                           Southern                                                    5         5         6         8         9
                           Central                                                     4         4         4         5         4
                           Mid-Continent                                              34        38        44        46        45
                           Rocky Mountain                                             26        24        26        27        26
                                                                                  ----------------------------------------------
                              Total United States                                    131       145       135       115       122
                                                                                  ----------------------------------------------
                         International
                           Canada                                                     19        17         6         -         -
                           Egypt                                                       1         5         8         8         8
                           Gabon                                                      16         9         5         -         -
                           Norway                                                      -         -         1         2         3
                           United Kingdom                                             29        31        41        39        48
                                                                                  ----------------------------------------------
                              Total International                                     65        62        61        49        59
                                                                                  ----------------------------------------------
                               Consolidated                                          196       207       196       164       181
                         Equity investee/(a)/                                         11         1         -         -         -
                                                                                  ----------------------------------------------
                                 Total                                               207       208       196       164       181
                         Natural gas liquids included in above                        22        19        17        17        17
                        --------------------------------------------------------------------------------------------------------
                        Net Natural Gas Production (millions of cubic
                         feet per day)
                         United States (by region)
                           Alaska                                                    160       148       144       151       145
                           Gulf Coast                                                 88       107        84        78        88
                           Southern                                                  147       178       208       189       161
                           Central                                                   156       134       117       119       109
                           Mid-Continent                                             133       129       125       125       122
                           Rocky Mountain                                             47        59        66        60        51
                                                                                  ----------------------------------------------
                              Total United States                                    731       755       744       722       676
                                                                                  ----------------------------------------------
                         International
                           Canada                                                    143       150        65         -         -
                           Egypt                                                       -        13        16        11        13
                           Ireland                                                   115       132       168       228       259
                           Norway                                                      -        26        27        54        87
                           United Kingdom - equity                                   212       168       165       130       140
                                          - other/(b)/                                11        16        23        32        32
                                                                                  ----------------------------------------------
                              Total International                                    481       505       464       455       531
                                                                                  ----------------------------------------------
                               Consolidated                                        1,212     1,260     1,208     1,177     1,207
                         Equity investee/(c)/                                         29        36        33        42        45
                                                                                  ----------------------------------------------
                                 Total                                             1,241     1,296     1,241     1,219     1,252
                        --------------------------------------------------------------------------------------------------------
                        Average Sales Prices
                         Liquid Hydrocarbons (dollars per barrel)/(d)(e)/
                           United States                                         $ 25.11    $15.44    $10.42    $16.88    $18.58
                           International                                           26.54     16.90     12.24     18.77     20.34
                         Natural Gas (dollars per thousand cubic feet)/(d)(e)/
                           United States                                         $  3.30    $ 1.90    $ 1.79    $ 2.20    $ 2.09
                           International                                            2.76      1.90      1.94      2.00      1.97
                        --------------------------------------------------------------------------------------------------------
                        Net Proved Reserves at year-end (developed and
                         undeveloped)
                         Liquid Hydrocarbons (millions of barrels)
                           United States                                             458       520       549       590       570
                           International                                             259       277       316       187       203
                                                                                  ----------------------------------------------
                              Consolidated                                           717       797       865       777       773
                           Equity investee/(a)/                                        -        77        80        82         -
                                                                                  ----------------------------------------------
                                 Total                                               717       874       945       859       773
                         Developed reserves as % of total net reserves                76%       81%       71%       77%       80%
                        --------------------------------------------------------------------------------------------------------
                         Natural Gas (billions of cubic feet)
                           United States                                           1,914     2,057     2,163     2,232     2,251
                           International                                           1,091     1,607     1,796     1,071     1,199
                                                                                  ----------------------------------------------
                              Consolidated                                         3,005     3,664     3,959     3,303     3,450
                           Equity investee/(c)/                                       89       123       110       111       132
                                                                                  ----------------------------------------------
                                 Total                                             3,094     3,787     4,069     3,414     3,582
                         Developed reserves as % of total net reserves                78%       75%       79%       83%       83%
                        --------------------------------------------------------------------------------------------------------


                        /(a)/  Represents Marathon's equity interest in Sakhalin
                               Energy Investment Company Ltd. and CLAM Petroleum
                               B.V.
                        /(b)/  Represents gas acquired for injection and
                               subsequent resale.
                        /(c)/  Represents Marathon's equity interest in CLAM
                               Petroleum B.V.
                        /(d)/  Prices exclude gains/losses from hedging
                               activities.
                        /(e)/  Prices exclude equity investees and
                               purchase/resale gas.

                                                                            M-23


                        Five-Year Operating Summary  continued



                                                                                2000/(a)/   1999/(a)/  1998/(a)/   1997      1996
                        ---------------------------------------------------------------------------------------------------------
                                                                                                              
                        U.S. Refinery Operations (thousands of barrels
                         per day)
                         In-use crude oil capacity at year-end                       935       935        935      575        570
                         Refinery runs - crude oil refined                           900       888        894      525        511
                                       - other charge and blend stocks               141       139        127       99         96
                         In-use crude oil capacity utilization rate                   96%       95%        96%      92%        90%
                        ---------------------------------------------------------------------------------------------------------
                        Source of Crude Processed (thousands of barrels
                         per day)
                         United States                                               400       349        317      202        229
                         Canada                                                      102        92         98       24         18
                         Middle East and Africa                                      346       363        394      241        193
                         Other International                                          52        84         85       58         73
                                                                                  -----------------------------------------------
                              Total                                                  900       888        894      525        513
                        ---------------------------------------------------------------------------------------------------------
                        Refined Product Yields (thousands of barrels
                         per day)
                         Gasoline                                                    552       566        545      353        345
                         Distillates                                                 278       261        270      154        155
                         Propane                                                      20        22         21       13         13
                         Feedstocks and special products                              74        66         64       36         35
                         Heavy fuel oil                                               43        43         49       35         30
                         Asphalt                                                      74        69         68       39         36
                                                                                  -----------------------------------------------
                              Total                                                1,041     1,027      1,017      630        614
                        ----------------------------------------------------------------------------------------------------------
                        Refined Products Yields (% breakdown)
                         Gasoline                                                     53%       55%        54%      56%        56%
                         Distillates                                                  27        25         27       24         25
                         Other products                                               20        20         19       20         19
                                                                                  -----------------------------------------------
                              Total                                                  100%      100%       100%     100%       100%
                        ---------------------------------------------------------------------------------------------------------
                        U.S. Refined Product Sales Volumes (thousands of
                         barrels per day)
                         Gasoline                                                    746       714        671      452        468
                         Distillates                                                 352       331        318      198        192
                         Propane                                                      21        23         21       12         12
                         Feedstocks and special products                              69        66         67       40         37
                         Heavy fuel oil                                               43        43         49       34         31
                         Asphalt                                                      75        74         72       39         35
                                                                                  -----------------------------------------------
                              Total                                                1,306     1,251      1,198      775        775
                         Matching buy/sell volumes included in above                  52        45         39       51         71
                        ---------------------------------------------------------------------------------------------------------
                        Refined Products Sales Volumes by Class of Trade
                         (as a % of total sales volumes)
                         Wholesale - independent private-brand
                                        marketers and consumers                       65%       66%        65%      61%        62%
                         Marathon and Ashland brand jobbers and dealers               12        11         11       13         13
                         Speedway SuperAmerica retail outlets                         23        23         24       26         25
                                                                                  -----------------------------------------------
                              Total                                                  100%      100%       100%     100%       100%
                        ---------------------------------------------------------------------------------------------------------
                        Refined Products (dollars per barrel)
                         Average sales price                                     $ 38.24   $ 24.59    $ 20.65  $ 26.38    $ 27.43
                         Average cost of crude oil throughput                      29.07     18.66      13.02    19.00      21.94
                        ---------------------------------------------------------------------------------------------------------
                        Petroleum Inventories at year-end (thousands of
                         barrels)
                         Crude oil, raw materials and natural gas liquids         33,720    34,255     35,630   19,351     20,047
                         Refined products                                         34,386    32,853     32,334   20,598     21,283
                        ---------------------------------------------------------------------------------------------------------
                        U.S. Refined Product Marketing Outlets at year-end
                         MAP operated terminals                                       91        93         88       51         51
                         Retail - Marathon and Ashland brand outlets               3,728     3,482      3,117    2,465      2,392
                                - Speedway SuperAmerica outlets                    2,242     2,433      2,257    1,544      1,592
                        ---------------------------------------------------------------------------------------------------------
                        Pipelines (miles of common carrier pipelines)/(b)/
                         Crude Oil - gathering lines                                 419       557      2,827    1,003      1,052
                                   - trunklines                                    4,623     4,720      4,859    2,665      2,665
                         Products  - trunklines                                    2,834     2,856      2,861    2,310      2,310
                                                                                  -----------------------------------------------
                              Total                                                7,876     8,133     10,547    5,978      6,027
                        ---------------------------------------------------------------------------------------------------------
                        Pipeline Barrels Handled (millions)/(c)/
                         Crude Oil - gathering lines                                22.7      30.4       47.8     43.9       43.2
                                   - trunklines                                    563.6     545.7      571.9    369.6      378.7
                         Products  - trunklines                                    329.7     331.9      329.7    262.4      274.8
                                                                                  -----------------------------------------------
                              Total                                                916.0     908.0      949.4    675.9      696.7
                        ---------------------------------------------------------------------------------------------------------
                        River Operations
                         Barges    - owned/leased                                    158       169        169        -          -
                         Boats     - owned/leased                                      6         8          8        -          -
                        ---------------------------------------------------------------------------------------------------------


                        /(a)/ 1998-2000 statistics include 100% of MAP and
                              should be considered when compared to prior
                              periods.
                        /(b)/ Pipelines for downstream operations also include
                              non-common carrier, leased and equity investees.
                        /(c)/ Pipeline barrels handled on owned common carrier
                              pipelines, excluding equity investees.

M-24


Five-Year Financial Summary



(Dollars in millions, except as noted)                  2000         1999         1998         1997         1996
-------------------------------------------------------------------------------------------------------------------
                                                                                          
Revenues and Other Income
 Revenues by product:
   Refined products                                   $ 22,514      $15,181      $12,852      $ 10,300     $ 10,437
   Merchandise                                           2,441        2,194        1,941         1,099        1,051
   Liquid hydrocarbons                                   6,856        4,587        5,023         2,755        3,166
   Natural gas                                           2,518        1,429        1,187         1,368        1,222
   Transportation and other products                       158          199          271           167          180
 Gain on ownership change in MAP                            12           17          245             -            -
 Other/(a)/                                               (640)         100          104            86           97
                                                      --------------------------------------------------------------
      Total revenues and other income/(b)/            $ 33,859      $23,707      $21,623      $ 15,775     $ 16,153
--------------------------------------------------------------------------------------------------------------------
Income From Operations
 Exploration and production (E&P)
   Domestic                                           $  1,115      $   494      $   190      $    500     $    547
   International                                           420          124           88           273          353
                                                      --------------------------------------------------------------
    Income for E&P reportable segment                    1,535          618          278           773          900
 Refining, marketing and transportation                  1,273          611          896           563          249
 Other energy related businesses                            38           61           33            48           57
                                                      --------------------------------------------------------------
    Income for reportable segments                       2,846        1,290        1,207         1,384        1,206
 Items not allocated to reportable segments:
   Administrative expenses                                (136)        (108)        (106)         (168)        (133)
   Joint venture formation charges                        (931)           -            -             -            -
   Inventory market valuation adjustments                    -          551         (267)         (284)         209
   Gain on ownership change & transition
    charges - MAP                                           12           17          223             -            -
   Int'l. & domestic oil & gas impairments &
    gas contract settlement                               (197)         (16)        (119)            -            -
   Other items                                              54          (21)           -             -           14
                                                      --------------------------------------------------------------
      Income from operations                             1,648        1,713          938           932        1,296
 Minority interest in income of MAP                        498          447          249             -            -
 Net interest and other financial costs                    236          288          237           260          305
 Provision for income taxes                                482          324          142           216          320
                                                      --------------------------------------------------------------
Income Before Extraordinary Loss                      $    432      $   654      $   310      $    456     $    671
 Per common share  - basic (in dollars)                   1.39         2.11         1.06          1.59         2.33
                   - diluted (in dollars)                 1.39         2.11         1.05          1.58         2.31
--------------------------------------------------------------------------------------------------------------------
Net Income                                            $    432      $   654      $   310      $    456     $    664
 Per common share  - basic (in dollars)                   1.39         2.11         1.06          1.59         2.31
                   - diluted (in dollars)                 1.39         2.11         1.05          1.58         2.29
--------------------------------------------------------------------------------------------------------------------
Balance Sheet Position at year-end
 Current assets                                       $  4,985      $ 4,081      $ 2,976      $  2,018     $  2,046
 Net property, plant and equipment                       9,375       10,293       10,429         7,566        7,298
 Total assets                                           15,232       15,674       14,544        10,565       10,151
 Short-term debt                                           228           48          191           525          323
 Other current liabilities                               3,784        3,096        2,419         1,737        1,819
 Long-term debt                                          1,937        3,320        3,456         2,476        2,642
 Minority interest in MAP                                1,840        1,753        1,590             -            -
 Common stockholders' equity                             4,845        4,800        4,312         3,618        3,340
   Per share (in dollars)                                15.70        15.38        13.95         12.53        11.62
--------------------------------------------------------------------------------------------------------------------
Cash Flow Data
 Net cash from operating activities                   $  3,158      $ 2,016      $ 1,642      $  1,246     $  1,503
 Capital expenditures                                    1,425        1,378        1,270         1,038          751
 Disposal of assets                                        539          356           65            60          282
 Dividends paid                                            274          257          246           219          201
--------------------------------------------------------------------------------------------------------------------
Employee Data/(c)/
 Marathon Group:
   Total employment costs                             $  1,474      $ 1,421      $ 1,054      $    854     $    790
   Average number of employees                          31,515       33,086       24,344        20,695       20,461
   Number of pensioners at year-end                      3,255        3,402        3,378         3,099        3,203
 Speedway SuperAmerica LLC (SSA):
  (Included in Marathon Group totals)
   Total employment costs                             $    489      $   452      $   283      $    263     $    241
   Average number of employees                          21,649       22,801       12,831        12,816       12,474
   Number of pensioners at year-end                        211          209          212           215          207
--------------------------------------------------------------------------------------------------------------------
Stockholder Data at year-end
 Number of common shares
  outstanding (in millions)                              308.3        311.8        308.5         288.8        287.5
 Registered shareholders (in thousands)                   65.0         71.4         77.3          84.0         92.1
 Market price of common stock                         $ 27.750      $24.688      $30.125      $ 33.750     $ 23.875
--------------------------------------------------------------------------------------------------------------------

/(a)/ Includes dividend and investee income, net gains (losses) on disposal of
      assets and other income.
/(b)/ 1996-1999 reclassified to conform to 2000 classifications.
/(c)/ Employee Data for 1998 includes Ashland employees from the date of their
      payroll transfer to MAP, which occurred at various times throughout 1998.
      These employees were contracted to MAP in 1998, prior to their payroll
      transfer.

                                                                            M-25


                        Management's Discussion and Analysis

                            The Marathon Group includes Marathon Oil Company
                        ("Marathon") and certain other subsidiaries of USX
                        Corporation ("USX"), which are engaged in worldwide
                        exploration and production of crude oil and natural gas;
                        domestic refining, marketing and transportation of
                        petroleum products primarily through Marathon Ashland
                        Petroleum LLC ("MAP"), owned 62 percent by Marathon; and
                        other energy related businesses. The Management's
                        Discussion and Analysis should be read in conjunction
                        with the Marathon Group's Financial Statements and Notes
                        to Financial Statements.

                            The Marathon Group's 2000 financial performance was
                        primarily affected by the strong recovery in worldwide
                        liquid hydrocarbon and natural gas prices and stronger
                        refining margins. During 2000, Marathon focused on the
                        acquisition of assets with a strong strategic fit, the
                        disposal of non-core properties, and workforce
                        reductions through a voluntary early retirement program.

                            Certain sections of Management's Discussion and
                        Analysis include forward-looking statements concerning
                        trends or events potentially affecting the businesses of
                        the Marathon Group. These statements typically contain
                        words such as "anticipates", "believes", "estimates",
                        "expects", "targets" or similar words indicating that
                        future outcomes are uncertain. In accordance with "safe
                        harbor" provisions of the Private Securities Litigation
                        Reform Act of 1995, these statements are accompanied by
                        cautionary language identifying important factors,
                        though not necessarily all such factors, that could
                        cause future outcomes to differ materially from those
                        set forth in forward-looking statements. For additional
                        risk factors affecting the businesses of the Marathon
                        Group, see Supplementary Data - Disclosures About
                        Forward-Looking Statements in USX's 2000 Form 10-K.

Management's Discussion and Analysis of Income and Operations

                            Revenues and Other Income for each of the last three
                        years are summarized in the following table:



                        (Dollars in millions)                                                 2000          1999           1998
                        ---------------------------------------------------------------------------------------------------------
                                                                                                               
                        Exploration & production ("E&P")                                   $  4,694       $  3,105      $  2,090
                        Refining, marketing & transportation ("RM&T")/(a)/                   28,849         20,076        19,080
                        Other energy related businesses/(b)/                                  1,684            834           355
                                                                                           ---------      ---------     ---------
                           Revenues and other income of reportable segments                  35,227         24,015        21,525
                        Revenues and other income not allocated to segments:
                         Joint venture formation charges/(c)/                                  (931)             -             -
                         Gain on ownership change in MAP                                         12             17           245
                         Other/(d)/                                                             124            (36)           24
                        Elimination of intersegment revenues                                   (573)          (289)         (171)
                                                                                           ---------      ---------     ---------
                           Total Group revenues and other income                           $ 33,859       $ 23,707      $ 21,623
                                                                                           =========      =========     =========

                        Items included in both revenues and costs and expenses,
                        resulting in no effect on income:

                        Consumer excise taxes on petroleum
                         products and merchandise                                          $  4,344       $  3,973      $  3,824


                        --------------------------------------------------------
                        /(a)/ Amounts include 100 percent of MAP.
                        /(b)/ Includes domestic natural gas and crude oil
                              marketing and transportation, and power
                              generation.
                        /(c)/ Represents a pretax charge related to the joint
                              venture formation between Marathon and Kinder
                              Morgan Energy Partners, L.P.
                        /(d)/ Represents net gains/(losses) on certain asset
                              sales.

                            E&P segment revenues increased by $1,589 million in
                        2000 from 1999 following an increase of $1,015 million
                        in 1999 from 1998. The increase in 2000 was primarily
                        due to higher worldwide liquid hydrocarbon and natural
                        gas prices, partially offset by lower domestic liquid
                        hydrocarbon and worldwide natural gas production. The
                        increase in 1999 was primarily due to higher worldwide
                        liquid hydrocarbon prices, increased domestic liquid
                        hydrocarbon production and higher E&P crude oil buy/sell
                        volumes.

                            RM&T segment revenues increased by $8,773 million in
                        2000 from 1999 following an increase of $996 million in
                        1999 from 1998. The increase in 2000 primarily reflected
                        higher refined product prices and increased refined
                        product sales volumes. The increase in 1999 was mainly
                        due to higher refined

M-26


                        Management's Discussion and Analysis continued

                        product prices, increased volumes of refined product
                        sales and higher merchandise sales, partially offset by
                        reduced crude oil sales revenues following the sale of
                        Scurlock Permian LLC.

                            Other energy related businesses segment revenues
                        increased by $850 million in 2000 from 1999 following an
                        increase of $479 million in 1999 from 1998. The increase
                        in 2000 reflected higher natural gas and crude oil
                        resale activity accompanied by higher crude oil and
                        natural gas prices. The increase in 1999 was primarily
                        due to increased crude oil and natural gas purchase and
                        resale activity.

                            For additional discussion of revenues, see Note 10
                            to the Marathon Group Financial Statements.

                            Income from operations for each of the last three
                            years is summarized in the following table:



                        (Dollars in millions)                                                2000          1999           1998
                        ---------------------------------------------------------------------------------------------------------
                                                                                                               
                        E&P
                         Domestic                                                          $  1,115        $   494      $    190
                         International                                                          420            124            88
                                                                                           ---------       --------     ---------
                           Income of E&P reportable segment                                   1,535            618           278
                        RM&T/(a)/                                                             1,273            611           896
                        Other energy related businesses                                          38             61            33
                                                                                           ---------       --------     ---------
                              Income for reportable segments                                  2,846          1,290         1,207
                        Items not allocated to reportable segments:
                           Joint venture formation charges/(b)/                                (931)             -             -
                           Administrative expenses/(c)/                                        (136)          (108)         (106)
                           IMV reserve adjustment/(d)/                                            -            551          (267)
                           Gain on ownership change & transition charges - MAP/(e)/              12             17           223
                           Impairment of oil and gas properties, assets held for sale,
                              and gas contract settlement/(f)/                                 (197)           (16)         (119)
                           Gain/(loss) on disposal of assets/(g)/                               124            (36)            -
                           Reorganization charges including pension settlement
                              (loss)/gain & benefit accruals/(h)/                               (70)            15             -
                                                                                           ---------       --------     ---------
                              Total income from operations                                 $  1,648        $ 1,713      $    938


                        --------------------------------------------------------
                        /(a)/ Amounts include 100 percent of MAP.
                        /(b)/ Represents a pretax charge related to the joint
                              venture formation between Marathon and Kinder
                              Morgan Energy Partners, L.P.
                        /(c)/ Includes the portion of the Marathon Group's
                              administrative costs not charged to the operating
                              segments and the portion of USX corporate general
                              and administrative costs allocated to the Marathon
                              Group.
                        /(d)/ The inventory market valuation ("IMV") reserve
                              reflects the extent to which the recorded LIFO
                              cost basis of crude oil and refined products
                              inventories exceeds net realizable value. For
                              additional discussion of the IMV, see Note 20 to
                              the Marathon Group Financial Statements.
                        /(e)/ The gain on ownership change and one-time
                              transition charges in 1998 relate to the formation
                              of MAP. For additional discussion of the gain on
                              ownership change in MAP, see Note 5 to the
                              Marathon Group Financial Statements.
                        /(f)/ Represents in 2000, an impairment of certain oil
                              and gas properties, primarily in Canada, and
                              assets held for sale. Represents in 1999, an
                              impairment of certain domestic properties.
                              Represents in 1998, a write-off of certain non-
                              revenue producing international investments and
                              several exploratory wells which had encountered
                              hydrocarbons but had been suspended pending
                              further evaluation. It also includes in 1998 a
                              gain from the resolution of a contract dispute
                              with a purchaser of Marathon's natural gas
                              production from certain domestic properties.
                        /(g)/ The net gain in 2000 represents a gain on the
                              disposition of Angus/Stellaria, a gain on the
                              Sakhalin exchange, a gain on the sale of Speedway
                              SuperAmerica LLC ("SSA") non-core stores, and a
                              loss on the sale of the Howard Glasscock field.
                              The net loss in 1999 represents a loss on the sale
                              of Scurlock Permian LLC, certain domestic
                              production properties, Carnegie Natural Gas
                              Company and affiliated subsidiaries and a gain on
                              certain Egyptian properties.
                        /(h)/ Amounts in 2000 and 1999 represent pension
                              settlement gains/(losses) and various benefit
                              accruals resulting from retirement plan
                              settlements, the voluntary early retirement
                              program, and reorganization charges.

                                                                            M-27


                        Management's Discussion and Analysis continued

                            Income for reportable segments increased by $1,556
                        million in 2000 from 1999, mainly due to higher
                        worldwide liquid hydrocarbon and natural gas prices, and
                        higher refined product margins, partially offset by
                        decreased natural gas volumes. Income for reportable
                        segments increased by $83 million in 1999 from 1998,
                        mainly due to higher worldwide liquid hydrocarbon
                        prices, partially offset by lower refined product
                        margins. Income from operations includes 100 percent of
                        MAP beginning in 1998, and results from Marathon Canada
                        Limited (formerly known as Tarragon) commencing August
                        12, 1998.



                                                          Average Volumes and Selling Prices
                                                                                             2000          1999           1998
                        ---------------------------------------------------------------------------------------------------------
                                                                                                               
                        (thousands of barrels per day)
                        Net liquids production/(a)/  - U.S.                                     131            145           135
                                                     - International/(b)/                        65             62            61
                                                                                           ---------      ---------     ---------
                                                     - Total consolidated                       196            207           196
                                                     - Equity investees/(c)/                     11              1             _
                                                                                           ---------      ---------     ---------
                                                     - Worldwide                                207            208           196
                        (millions of cubic feet per day)
                        Net natural gas production   - U.S.                                     731            755           744
                                                     - International - equity                   470            489           441
                                                     - International - other/(d)/                11             16            23
                                                                                           ---------      ---------     ---------
                                                     - Total consolidated                     1,212          1,260         1,208
                                                     - Equity investee/(e)/                      29             36            33
                                                                                           ---------      ---------     ---------
                                                     - Worldwide                              1,241          1,296         1,241
                       ----------------------------------------------------------------------------------------------------------
                        (dollars per barrel)
                        Liquid hydrocarbons/(a)(f)/  - U.S.                                $  25.11       $  15.44      $  10.42
                                                     - International                          26.54          16.90         12.24
                        (dollars per mcf)
                        Natural gas/(f)/             - U.S.                                $   3.30       $   1.90      $   1.79
                                                     - International - equity                  2.76           1.90          1.94
                        (thousands of barrels per day)
                        Refined products sold/(g)/                                            1,306          1,251         1,198
                           Matching buy/sell volumes included in above                           52             45            39
                       ----------------------------------------------------------------------------------------------------------


                        /(a)/ Includes crude oil, condensate and natural gas
                              liquids.
                        /(b)/ Represents equity tanker liftings, truck
                              deliveries and direct deliveries.
                        /(c)/ Represents Marathon's equity interest in Sakhalin
                              Energy Investment Company Ltd. ("Sakhalin Energy")
                              and CLAM Petroleum B.V. ("CLAM") for 2000 and
                              1999.
                        /(d)/ Represents gas acquired for injection and
                              subsequent resale.
                        /(e)/ Represents Marathon's equity interest in CLAM.
                        /(f)/ Prices exclude gains/losses from hedging
                              activities, equity investees and purchase/resale
                              gas.
                        /(g)/ Refined products sold and matching buy/sell
                              volumes include 100 percent of MAP.

                            Domestic E&P income increased by $621 million in
                        2000 from 1999 following an increase of $304 million in
                        1999 from 1998. The increase in 2000 was primarily due
                        to higher liquid hydrocarbon and natural gas prices,
                        partially offset by lower liquid hydrocarbon and natural
                        gas volumes due to natural field declines and asset
                        sales, and derivative losses from other than trading
                        activities.

                            The increase in 1999 was primarily due to higher
                        liquid hydrocarbon and natural gas prices, increased
                        liquid hydrocarbon volumes resulting from new production
                        in the Gulf of Mexico and lower exploration expense.

                            International E&P income increased by $296 million
                        in 2000 from 1999 following an increase of $36 million
                        in 1999 from 1998. The increase in 2000 was mainly due
                        to higher liquid hydrocarbon and natural gas prices,
                        higher liquid hydrocarbon liftings, primarily in Russia
                        and Gabon, and lower dry well expense, partially offset
                        by lower natural gas volumes.

                            The increase in 1999 was primarily due to higher
                        liquid hydrocarbon prices, partially offset by lower
                        liquid hydrocarbon and natural gas production in Europe
                        and higher exploration expense.

M-28


                        Management's Discussion and Analysis continued

                            RM&T segment income increased by $662 million in
                        2000 from 1999 following a decrease of $285 million in
                        1999 from 1998. The increase in 2000 was primarily due
                        to higher refined product margins, partially offset by
                        higher operating expenses for SSA, higher administrative
                        expenses including increased variable pay plan costs,
                        and higher transportation costs.

                            The decrease in 1999 was primarily due to lower
                        refined product margins, partially offset by recognized
                        mark-to-market derivative gains, increased refined
                        product sales volumes, higher merchandise sales at SSA
                        and the realization of additional operating efficiencies
                        as a result of forming MAP.

                            Other energy related businesses segment income
                        decreased by $23 million in 2000 from 1999 following an
                        increase of $28 million in 1999 from 1998. The decrease
                        in 2000 was primarily a result of derivative losses from
                        other than trading activities and lower equity earnings
                        as a result of decreased pipeline throughput. The
                        increase in 1999 was primarily due to higher equity
                        earnings as a result of increased pipeline throughput
                        and a reversal of abandonment accruals of $10 million in
                        1999.

                            Items not allocated to reportable segments: IMV
                        reserve adjustment - When U. S. Steel Corporation
                        acquired Marathon Oil Company in March 1982, crude oil
                        and refined product prices were at historically high
                        levels. In applying the purchase method of accounting,
                        the Marathon Group's crude oil and refined product
                        inventories were revalued by reference to current prices
                        at the time of acquisition, and this became the new LIFO
                        cost basis of the inventories. Generally accepted
                        accounting principles require that inventories be
                        carried at lower of cost or market. Accordingly, the
                        Marathon Group has established an IMV reserve to reduce
                        the cost basis of its inventories to net realizable
                        value. Quarterly adjustments to the IMV reserve result
                        in noncash charges or credits to income from operations.

                            When Marathon acquired the crude oil and refined
                        product inventories associated with Ashland's RM&T
                        operations on January 1, 1998, the Marathon Group
                        established a new LIFO cost basis for those inventories.
                        The acquisition cost of these inventories lowered the
                        overall average cost of the Marathon Group's combined
                        RM&T inventories. As a result, the price threshold at
                        which an IMV reserve will be recorded was also lowered.

                            These adjustments affect the comparability of
                        financial results from period to period as well as
                        comparisons with other energy companies, many of which
                        do not have such adjustments. Therefore, the Marathon
                        Group reports separately the effects of the IMV reserve
                        adjustments on financial results. In management's
                        opinion, the effects of such adjustments should be
                        considered separately when evaluating operating
                        performance.

                            In 1999, the IMV reserve adjustment resulted in a
                        credit to income from operations of $551 million
                        compared to a charge of $267 million in 1998, or a
                        change of $818 million. The favorable 1999 IMV reserve
                        adjustment, which is almost entirely recorded by MAP,
                        was primarily due to the significant increase in refined
                        product prices experienced during 1999. For additional
                        discussion of the IMV reserve, see Note 20 to the
                        Marathon Group Financial Statements.

                            Joint venture formation charges represent a pretax
                        charge of $931 million in 2000 related to the joint
                        venture formation between Marathon and Kinder Morgan
                        Energy Partners, L.P. The formation of the joint venture
                        included contribution of interests in the Yates and
                        SACROC assets. Marathon holds an 85 percent economic
                        interest in the combined entity which commenced
                        operations in January 2001.

                            Impairment of oil and gas properties, assets held
                        for sale, and gas contract settlement includes in 2000,
                        the impairments of certain oil and gas properties
                        primarily in Canada and assets held for sale totaling
                        $197 million. In 1999, the $16 million charge relates to
                        the impairment of certain domestic properties. In 1998,
                        the $119 million charge relates to a write-off of
                        certain non-revenue producing international investments
                        and several exploratory wells, partially offset by a
                        gain from the resolution of a contract dispute with a
                        purchaser of Marathon's natural gas production from
                        certain domestic properties.

                            Gain/(loss) on disposal of assets represents in 2000
                        a net gain on the sale of Marathon's interest in the
                        Angus/Stellaria development in the Gulf of Mexico, a
                        gain on the Sakhalin exchange, a loss on the sale of the
                        Howard Glasscock Field, and a gain on the sale of
                        non-core SSA stores. In 1999,

                                                                            M-29


                        Management's Discussion and Analysis continued

                        the net loss represents losses on the sale of Scurlock
                        Permian LLC, certain domestic production properties,
                        Carnegie Natural Gas Company and affiliated subsidiaries
                        and a gain on certain Egyptian properties.

                            Reorganization charges including pension settlement
                        (loss)/gain and benefit accruals represent charges
                        related to a reorganization program initiated by
                        Marathon for its upstream business during 2000.

                            Net interest and other financial costs decreased by
                        $52 million in 2000 from 1999, following an increase of
                        $51 million in 1999 from 1998. The decrease in 2000 was
                        primarily due to lower average debt levels and increased
                        interest income. The increase in 1999 was primarily due
                        to lower interest income and lower capitalized interest
                        on upstream projects. For additional details, see Note 6
                        to the Marathon Group Financial Statements.

                            The minority interest in income of MAP, which
                        represents Ashland's 38 percent ownership interest,
                        increased by $51 million in 2000 from 1999, primarily
                        due to much higher RM&T segment income and the absence
                        of the favorable 1999 IMV reserve adjustment, as
                        discussed above.

                            The provision for income taxes of $482 million in
                        2000 included a $235 million one-time, noncash deferred
                        tax charge as a result of the change in the amount and
                        timing of future foreign source income due to the
                        exchange of Marathon's interest in Sakhalin Energy
                        Investment Company Ltd. for other oil and gas producing
                        interests. The 1999 income tax provision included a $23
                        million favorable adjustment to deferred federal income
                        taxes related to the outcome of a United States Tax
                        Court case. For additional discussion of income taxes,
                        see Note 18 to the Marathon Group Financial Statements.

                            Net income decreased by $222 million in 2000 from
                        1999, following an increase of $344 million in 1999 from
                        1998, primarily reflecting the factors discussed above.

Management's Discussion and Analysis of Financial Condition, Cash Flows and
 Liquidity

                            Current assets increased $904 million from year-end
                        1999, primarily due to an increase in cash, receivables,
                        and assets held for sale. The increase in assets held
                        for sale was mainly due to the reclassification of the
                        Yates field from property, plant, and equipment. The
                        receivables increase was mainly due to higher year-end
                        commodity prices.

                            Current liabilities increased $868 million from
                        year-end 1999, primarily due to an increase in accounts
                        payable due to higher year-end commodity prices and the
                        recording of an intergroup income tax payable.

                            Investments and long-term receivables decreased $400
                        million from year-end 1999, primarily due to the
                        exchange of Marathon's interest in Sakhalin Energy
                        Investment Company Ltd.

                            Net property, plant and equipment decreased $918
                        million from year-end 1999, primarily due to the
                        impairment and reclassification of assets held for sale,
                        the impairment of reserves, and the sale of certain
                        domestic production properties. This was partially
                        offset by increases from properties received from the
                        Sakhalin exchange. Net property, plant and equipment for
                        each of the last three years is summarized in the
                        following table:



                        (Dollars in millions)                          2000          1999           1998
                        ----------------------------------------------------------------------------------
                                                                                        
                        E&P
                         Domestic                                   $   2,229      $   3,435     $   3,688
                         International                                  2,924          2,987         3,027
                                                                    ---------      ---------     ---------
                           Total E&P                                    5,153          6,422         6,715
                        RM&T/(a)/                                       4,035          3,712         3,517
                        Other/(b)/                                        187            159           197
                                                                    ---------      ---------     ---------
                              Total                                 $   9,375      $  10,293     $  10,429
                        ----------------------------------------------------------------------------------


                        /(a)/ Amounts include 100 percent of MAP.
                        /(b)/ Includes other energy related businesses and other
                              miscellaneous corporate net property, plant and
                              equipment.

                            Total long-term debt and notes payable at December
                        31, 2000 were $2,165 million, a decrease of $1,203
                        million from year-end 1999. This decrease in debt is
                        mainly due to higher cash flow provided from operating
                        activities. Most of the debt is a direct obligation of,
                        or is guaranteed by, USX.

M-30


                        Management's Discussion and Analysis continued

                            Stockholders' equity increased $45 million from
                        year-end 1999, mainly reflecting net income of $432
                        million offset by dividends declared of $274 million and
                        Marathon Stock repurchases of $105 million. In July
                        2000, the USX Board of Directors authorized spending up
                        to $450 million to repurchase shares of Marathon Stock.
                        This repurchase program will continue from time to time
                        as the Corporation's financial condition and market
                        conditions warrant.

                            Net cash provided from operating activities totaled
                        $3,158 million in 2000, compared with $2,016 million in
                        1999 and $1,642 million in 1998. Net cash from operating
                        activities increased $1,142 million in 2000 from 1999
                        and increased $374 million in 1999 from 1998. The
                        increase in 2000 mainly reflects the favorable effects
                        of improved net income (excluding noncash items) and net
                        favorable working capital changes, including an
                        increased allocation for income tax payments and an
                        income tax settlement with the Steel Group in accordance
                        with the group tax allocation policy. The increase in
                        1999 mainly reflected favorable working capital changes.

                            Capital expenditures for each of the last three
                        years are summarized in the following table:



                        (Dollars in millions)                                                 2000          1999           1998
                        ---------------------------------------------------------------------------------------------------------
                                                                                                               
                        E&P
                         Domestic                                                          $     516      $     356     $     652
                         International/(a)/                                                      226            388           187
                                                                                           ---------      ---------     ---------
                              Total E&P                                                          742            744           839
                        RM&T/(b)/                                                                656            612           410
                        Other/(c)/                                                                27             22            21
                                                                                           ---------      ---------     ---------
                              Total                                                        $   1,425      $   1,378     $   1,270
                        ---------------------------------------------------------------------------------------------------------


                        /(a)/ Amount for 1998 excludes the Tarragon acquisition.
                        /(b)/ Amounts include 100 percent of MAP.
                        /(c)/ Includes other energy related businesses and other
                              miscellaneous corporate capital expenditures.

                            During 2000, domestic E&P capital spending mainly
                        included the completion of the Viosca Knoll Block 786
                        (Petronius) development in the Gulf of Mexico, various
                        producing property acquisitions, and natural gas
                        developments in East Texas and other gas basins
                        throughout the western United States. International E&P
                        projects included the completion of the Tchatamba West
                        development, located offshore Gabon, and continued oil
                        and natural gas developments in Canada. RM&T spending by
                        MAP primarily consisted of refinery modifications,
                        including the initiation of the delayed coker unit
                        project at the Garyville refinery, and upgrades and
                        expansions of retail marketing outlets. Contract
                        commitments for property, plant and equipment
                        acquisitions and long-term investments at year-end 2000
                        were $457 million, compared with $485 million at
                        year-end 1999.

                            Costs incurred for the periods ended December 31,
                        2000, 1999 and 1998 relating to the development of
                        proved undeveloped oil and gas reserves, including
                        equity investees, were $316 million, $333 million, and
                        $496 million, respectively. As of December 31, 2000,
                        estimated future development costs relating to the
                        development of proved undeveloped oil and gas reserves
                        for the years 2001 through 2003 are projected to be $337
                        million, $115 million, and $97 million.

                            Capital expenditures in 2001 are expected to be
                        approximately $1.5 billion, which is consistent with
                        2000 levels. Domestic E&P projects planned for 2001 will
                        focus on gas projects and include various producing
                        property acquisitions. Planned capital expenditures in
                        2001 do not include the capital requirements related to
                        the acquisition of Pennaco Energy, Inc. ("Pennaco").
                        International E&P projects include the continued
                        development of the Foinaven area in the U.K. Atlantic
                        Margin and continued oil and natural gas developments in
                        Canada. RM&T spending by MAP will primarily consist of
                        refinery improvements, including the completion of the
                        delayed coker unit project at the Garyville refinery,
                        upgrades and expansions of retail marketing outlets, and
                        expansion and enhancement of logistics systems. Other
                        Marathon spending will include funds for development and
                        installation of SAP software, which is an enterprise
                        resource planning system that will allow the integration
                        of processes among business units and with outside
                        enterprises.

                            Investments in investees were $65 million in 2000,
                        compared with $59 million in 1999. The amounts in both
                        periods mainly reflected development spending for the
                        Sakhalin II project in Russia.

                            Loans and advances to investees were $6 million in
                        2000, compared with $70 million in 1999. Cash outflows
                        in both periods primarily reflected funding provided to
                        equity investees for capital

                                                                            M-31


                        Management's Discussion and Analysis continued

                        projects. In 2000, the cash outflow was primarily
                        related to the Centennial Pipeline project, and in 1999,
                        the outflow was primarily related to the Sakhalin II
                        project.

                            Repayments of loans and advances to investees were
                        $10 million in 2000, compared with $1 million in 1999.
                        The 2000 amount primarily was a result of repayments by
                        a foreign power subsidiary of advances made by Marathon.

                            The above statements with respect to future capital
                        expenditures and investments are forward-looking
                        statements, reflecting management's best estimates,
                        based on information currently available. To the extent
                        this information proves to be inaccurate, the timing and
                        levels of future spending could differ materially from
                        those included in the forward-looking statements.
                        Factors that could cause future capital expenditures to
                        differ materially from present expectations include
                        price volatility, worldwide supply and demand for
                        petroleum products, general worldwide economic
                        conditions, levels of cash flow from operations,
                        available business opportunities, unforeseen hazards
                        such as weather conditions, and/or delays in obtaining
                        government or partner approvals.

                            The acquisition of Tarragon Oil and Gas Limited in
                        1998 included cash payments of $686 million. For further
                        discussion of Tarragon, see Note 5 to the Marathon Group
                        Financial Statements.

                            Cash from disposal of assets was $539 million in
                        2000, compared with $356 million in 1999 and $65 million
                        in 1998. Proceeds in 2000 were mainly from the Sakhalin
                        exchange, the disposition of Marathon's interest in the
                        Angus/Stellaria development in the Gulf of Mexico, the
                        sale of non-core SSA stores and other domestic
                        production properties. Proceeds in 1999 were mainly from
                        the sale of Scurlock Permian LLC, over 150 non-strategic
                        domestic and international production properties and
                        Carnegie Natural Gas Company and affiliated
                        subsidiaries. Proceeds in 1998 were mainly from the
                        sales of domestic production properties and equipment.

                            The net change in restricted cash was a net
                        withdrawal of $3 million in 2000 compared to a net
                        withdrawal of $1 million in 1999. Restricted cash in
                        both periods primarily reflected the net effects of cash
                        deposited and withdrawn from domestic production
                        property dispositions and acquisitions.

                            Net cash changes related to financial obligations,
                        which consist of the Marathon Group's portion of USX
                        debt and preferred stock of a subsidiary attributed to
                        both groups, as well as debt specifically attributed to
                        the Marathon Group, decreased by $1,206 million in 2000.
                        Financial obligations decreased primarily because cash
                        from operating activities and asset sales exceeded
                        capital expenditures, distributions to the minority
                        shareholder of MAP and dividend payments. For further
                        details, see Management's Discussion and Analysis of USX
                        Consolidated Financial Condition, Cash Flows and
                        Liquidity.

                            Marathon Stock repurchased was $105 million in 2000.
                        In July 2000, the USX Board of Directors authorized
                        spending up to $450 million to repurchase shares of
                        Marathon Stock. This repurchase program will continue
                        from time to time as the Corporation's financial
                        condition and market conditions warrant.

                            Distributions to minority shareholder of MAP were
                        $420 million in 2000, compared with $400 million in
                        1999. The 1999 amount included a distribution of $103
                        million in the first quarter 1999, which related to
                        fourth quarter 1998 MAP activity.

                        Derivative Instruments

                            See Quantitative and Qualitative Disclosures About
                        Market Risk for a discussion of derivative instruments
                        and associated market risk.

                        Liquidity

                            For discussion of USX's liquidity and capital
                        resources, see Management's Discussion and Analysis of
                        USX Consolidated Financial Condition, Cash Flows and
                        Liquidity.

Management's Discussion and Analysis of Environmental Matters, Litigation and
 Contingencies

                            The Marathon Group has incurred and will continue to
                        incur substantial capital, operating and maintenance,
                        and remediation expenditures as a result of
                        environmental laws and regulations. To the extent these
                        expenditures, as with all costs, are not ultimately
                        reflected in the prices of the Marathon Group's products
                        and services, operating results will be adversely
                        affected. The Marathon Group believes that substantially
                        all of its competitors are subject to similar
                        environmental laws and

M-32


                        Management's Discussion and Analysis continued

                        regulations. However, the specific impact on each
                        competitor may vary depending on a number of factors,
                        including the age and location of its operating
                        facilities, marketing areas, production processes and
                        whether or not it is engaged in the petrochemical
                        business, power business or the marine transportation of
                        crude oil and refined products.

                            Marathon Group environmental expenditures for each
                        of the last three years were/(a)/:



                        (Dollars in millions)                                                   2000        1999         1998
                        -----------------------------------------------------------------------------------------------------------
                                                                                                              
                        Capital                                                               $   73      $   46       $   83 /(b)/
                        Compliance
                         Operating & maintenance                                                 139         117          126
                         Remediation/(c)/                                                         30          25           10
                                                                                              ------      ------       ------
                              Total                                                           $  242      $  188       $  219
                        ------------------------------------------------------------------------------------------------------------


                        /(a)/ Amounts are determined based on American Petroleum
                              Institute survey guidelines and include 100
                              percent of MAP.
                        /(b)/ Reclassified to conform to 1999 classifications.
                        /(c)/ These amounts include spending charged against
                              remediation reserves, net of recoveries, where
                              permissible, but do not include noncash provisions
                              recorded for environmental remediation.

                            The Marathon Group's environmental capital
                        expenditures accounted for five percent of total capital
                        expenditures in 2000, three percent in 1999, and seven
                        percent in 1998 (excluding the acquisition of Tarragon).

                            During 1998 through 2000, compliance expenditures
                        represented one percent of the Marathon Group's total
                        operating costs. Remediation spending during this period
                        was primarily related to retail marketing outlets which
                        incur ongoing clean-up costs for soil and groundwater
                        contamination associated with underground storage tanks
                        and piping.

                            USX has been notified that it is a potentially
                        responsible party ("PRP") at 13 waste sites related to
                        the Marathon Group under the Comprehensive Environmental
                        Response, Compensation and Liability Act ("CERCLA") as
                        of December 31, 2000. In addition, there are 6 sites
                        related to the Marathon Group where USX has received
                        information requests or other indications that USX may
                        be a PRP under CERCLA but where sufficient information
                        is not presently available to confirm the existence of
                        liability.

                            There are also 115 additional sites, excluding
                        retail marketing outlets, related to the Marathon Group
                        where remediation is being sought under other
                        environmental statutes, both federal and state, or where
                        private parties are seeking remediation through
                        discussions or litigation. Of these sites, 15 were
                        associated with properties conveyed to MAP by Ashland
                        for which Ashland has retained liability for all costs
                        associated with remediation.

                            At many of these sites, USX is one of a number of
                        parties involved and the total cost of remediation, as
                        well as USX's share thereof, is frequently dependent
                        upon the outcome of investigations and remedial studies.
                        The Marathon Group accrues for environmental remediation
                        activities when the responsibility to remediate is
                        probable and the amount of associated costs is
                        reasonably determinable. As environmental remediation
                        matters proceed toward ultimate resolution or as
                        additional remediation obligations arise, charges in
                        excess of those previously accrued may be required. See
                        Note 25 to the Marathon Group Financial Statements.

                            New or expanded environmental requirements, which
                        could increase the Marathon Group's environmental costs,
                        may arise in the future. USX intends to comply with all
                        legal requirements regarding the environment, but since
                        many of them are not fixed or presently determinable
                        (even under existing legislation) and may be affected by
                        future legislation, it is not possible to predict
                        accurately the ultimate cost of compliance, including
                        remediation costs which may be incurred and penalties
                        which may be imposed. However, based on presently
                        available information, and existing laws and regulations
                        as currently implemented, the Marathon Group does not
                        anticipate that environmental compliance expenditures
                        (including operating and maintenance and remediation)
                        will materially increase in 2001. The Marathon Group's
                        environmental capital expenditures are expected to be
                        approximately $100 million in 2001. Predictions beyond
                        2001 can only be broad-based estimates which have
                        varied, and will continue to vary, due to the ongoing
                        evolution of specific regulatory requirements, the
                        possible imposition of more stringent requirements and
                        the availability of new


                                                                            M-33


                        Management's Discussion and Analysis continued

                        technologies, among other matters. Based upon currently
                        identified projects, the Marathon Group anticipates that
                        environmental capital expenditures will be approximately
                        $92 million in 2002; however, actual expenditures may
                        vary as the number and scope of environmental projects
                        are revised as a result of improved technology or
                        changes in regulatory requirements and could increase if
                        additional projects are identified or additional
                        requirements are imposed.

                            New Tier II Fuels regulations were proposed in late
                        1999. The gasoline rules, which were finalized by the
                        U.S. Environmental Protection Agency ("EPA") in February
                        2000, and the diesel fuel rule which was finalized in
                        January 2001, require substantially reduced sulfur
                        levels. The combined capital cost to achieve compliance
                        with the gasoline and diesel regulations could amount to
                        approximately $700 million between 2003 and 2005. This
                        is a forward-looking statement and can only be a
                        broad-based estimate due to the ongoing evolution of
                        regulatory requirements. Some factors (among others)
                        that could potentially affect gasoline and diesel fuel
                        compliance costs include obtaining the necessary
                        construction and environmental permits, operating
                        considerations, and unforeseen hazards such as weather
                        conditions.

                            In October 1998, the National Enforcement
                        Investigations Center and Region V of the EPA conducted
                        a multi-media inspection of MAP's Detroit refinery.
                        Subsequently, in November 1998, Region V conducted a
                        multi-media inspection of MAP's Robinson refinery. These
                        inspections covered compliance with the Clean Air Act
                        (New Source Performance Standards, Prevention of
                        Significant Deterioration, and the National Emission
                        Standards for Hazardous Air Pollutants for Benzene), the
                        Clean Water Act (permit exceedances for the Waste Water
                        Treatment Plant), reporting obligations under the
                        Emergency Planning and Community Right to Know Act and
                        the handling of process waste. MAP has been advised, in
                        ongoing discussions with the EPA, as to certain
                        compliance issues regarding MAP's Detroit and Robinson
                        refineries. Thus far, MAP has been served with two
                        Notices of Violation ("NOV") and three Findings of
                        Violation in connection with the multi-media inspections
                        at its Detroit refinery. The Detroit notices allege
                        violations of the Michigan State Air Pollution
                        Regulations, the EPA New Source Performance Standards
                        and National Emission Standards for Hazardous Air
                        Pollutants for Benzene. On March 6, 2000, MAP received
                        its first NOV arising out of the multi-media inspection
                        of the Robinson refinery conducted in November 1998. The
                        NOV is for alleged Resource Conservation and Recovery
                        Act (hazardous waste) violations.

                            MAP has responded to information requests from the
                        EPA regarding New Source Review ("NSR") compliance at
                        its Garyville and Texas City refineries. In addition,
                        the scope of the EPA's 1998 multi-media inspections of
                        the Detroit and Robinson refineries included NSR
                        compliance. NSR requires new major stationary sources
                        and major modifications at existing major stationary
                        sources to obtain permits, perform air quality analysis
                        and install stringent air pollution control equipment at
                        affected facilities. The current EPA initiative appears
                        to target many items that the industry has historically
                        considered routine repair, replacement and maintenance
                        or other activity exempted from the NSR requirements.
                        MAP is engaged in ongoing discussions with the EPA on
                        these issues concerning all of MAP's refineries.

                            While MAP has not been notified of any formal
                        findings or violations resulting from either the
                        information requests or inspections regarding NSR
                        compliance, MAP has been informed during discussions
                        with the EPA of potential non-compliance concerns of the
                        EPA based on these inspections and other information
                        identified by the EPA. Recently, discussions with the
                        EPA have included commitment to some specific control
                        technologies and implementation schedules, but not
                        penalties. In addition, MAP anticipates that some or all
                        of the non-NSR related issues arising from the
                        multi-media inspections may also be resolved as part of
                        the current discussions with the EPA. A negotiated
                        resolution with the EPA could result in increased
                        environmental capital expenditures in future years, in
                        addition to as yet, undetermined penalties.

                            During 1999 an EPA advisory panel on oxygenate use
                        in gasoline issued recommendations to the EPA, calling
                        for the improved protection of drinking water from
                        methyl tertiary butyl ether ("MTBE") impacts, a
                        substantial reduction in the use of MTBE, and action by
                        Congress to remove the oxygenate requirements for
                        reformulated gasoline under the Clean Air Act. The panel
                        reviewed public health and environmental issues that
                        have been raised by the use of MTBE in gasoline, and
                        specifically by the discovery of MTBE in water supplies.
                        State and federal environmental regulatory agencies
                        could implement the majority of the recommendations,
                        while some would require Congressional legislative
                        action. California has acted to ban MTBE use by December
                        31, 2002 and has requested a waiver from

M-34


                        Management's Discussion and Analysis continued

                        the EPA of California state oxygenate requirements. In
                        addition, a number of states have passed laws which
                        limit or require the phase out of MTBE in gasoline,
                        including states in MAP's marketing area such as
                        Michigan and Minnesota. Many other states are
                        considering bills which require similar limitations or
                        the phase out of MTBE.

                            MAP has a non-material investment in MTBE units at
                        its Robinson, Catlettsburg and Detroit refineries.
                        Approximately seven percent of MAP's refinery gasoline
                        production includes MTBE. Potential phase-outs or
                        restrictions on the use of MTBE would not be expected to
                        have a material impact on MAP and its operations,
                        although it is not possible to reach any conclusions
                        until further federal or state actions, if any, are
                        taken.

                            USX is the subject of, or party to, a number of
                        pending or threatened legal actions, contingencies and
                        commitments relating to the Marathon Group involving a
                        variety of matters, including laws and regulations
                        relating to the environment, certain of which are
                        discussed in Note 25 to the Marathon Group Financial
                        Statements. The ultimate resolution of these
                        contingencies could, individually or in the aggregate,
                        be material to the Marathon Group financial statements.
                        However, management believes that USX will remain a
                        viable and competitive enterprise even though it is
                        possible that these contingencies could be resolved
                        unfavorably to the Marathon Group. See Management's
                        Discussion and Analysis of USX Consolidated Financial
                        Condition, Cash Flows and Liquidity.

                        Outlook

                            This outlook is as of the original filing date of
                        March 12, 2001. For an updated outlook, see subsequent
                        filings with the U.S. Securities and Exchange
                        Commission.

                            The outlook regarding the results of operations for
                        the Marathon Group's upstream segment is largely
                        dependent upon future prices and volumes of liquid
                        hydrocarbons and natural gas. Prices have historically
                        been volatile and have frequently been affected by
                        unpredictable changes in supply and demand resulting
                        from fluctuations in worldwide economic activity and
                        political developments in the world's major oil and gas
                        producing and consuming areas. Any significant decline
                        in prices could have a material adverse effect on the
                        Marathon Group's results of operations. A prolonged
                        decline in such prices could also adversely affect the
                        quantity of crude oil and natural gas reserves that can
                        be economically produced and the amount of capital
                        available for exploration and development.

                            At year-end 2000, Marathon revised its estimate of
                        proved developed and undeveloped oil and gas reserves
                        downward by 167 million barrels of oil equivalent
                        ("BOE"). These revisions were principally in Canada, the
                        North Sea and United States and are the result of
                        production performance and disappointing drilling
                        results.

                            BOE is a combined measure of worldwide liquid
                        hydrocarbon and natural gas production, measured in
                        barrels per day and cubic feet per day, respectively.
                        For purposes of determining BOE, natural gas volumes are
                        converted to approximate liquid hydrocarbon barrels by
                        dividing the natural gas volumes expressed in thousands
                        of cubic feet ("mcf") by 6. The liquid hydrocarbon
                        volume is added to the barrel equivalent of gas volume
                        to obtain BOE. Marathon intends to disclose total
                        production estimates on a BOE basis from this point
                        forward.

                            In 2001, worldwide production is expected to average
                        430,000 BOE per day, split evenly between liquid
                        hydrocarbons and natural gas, including production from
                        Marathon's share of investees and future acquisitions.

                            On December 28, 2000, Marathon signed a definitive
                        agreement to form a joint venture with Kinder Morgan
                        Energy Partners, L.P., which commenced operations in
                        January 2001. The formation of the joint venture
                        included contribution of interests in the Yates and
                        SACROC assets. This transaction will allow Marathon to
                        expand its interests in the Permian Basin and will
                        improve access to materials for use in enhanced recovery
                        techniques in the Yates Field. Marathon holds an 85
                        percent economic interest in the combined entity, which
                        will be accounted for under the equity method of
                        accounting.

                            On December 22, 2000, Marathon announced its plans
                        to acquire Pennaco. This acquisition will enhance
                        Marathon's presence in a core area, the North American
                        gas market, and will provide an opportunity for possible
                        new reserves to be developed. The tender offer expired
                        on February 5, 2001 at 12:00 midnight, Eastern time.
                        Marathon acquired approximately 17.6 million shares of
                        Pennaco common stock which were validly tendered and not
                        withdrawn in the offer, representing approximately 87
                        percent of the outstanding Pennaco shares.

                                                                            M-35


                        Management's Discussion and Analysis continued

                            Marathon plans to acquire the remaining Pennaco
                        shares through a merger in which each share of Pennaco
                        common stock, not purchased in the offer and not held by
                        stockholders who have properly exercised dissenters
                        rights under Delaware law, will be converted into the
                        right to receive the tender offer price in cash, without
                        interest.

                            Marathon plans to drill six deepwater Gulf of Mexico
                        exploratory wells in 2001. To support this increased
                        drilling activity, Marathon has contracted two new
                        deepwater rigs, capable of drilling in water depths
                        beyond 6,500 feet.

                            Other major upstream projects, which are currently
                        underway or under evaluation and are expected to improve
                        future income streams, include the Mississippi Canyon
                        Block 348 in the Gulf of Mexico and various North
                        American natural gas fields. Also, Marathon expects
                        continued development in the Foinaven area in the U.K.
                        Atlantic Margin. Marathon acquired an interest in this
                        location through the exchange of its Sakhalin interests
                        with Shell Oil in the fourth quarter of 2000.

                            Marathon E&P is currently on target for achieving
                        $150 million in annual repeatable pre-tax operating
                        efficiencies by year-end 2001. Marathon initiated a
                        reorganization program for its upstream business units
                        which will contribute to an overall workforce reduction
                        of 24% compared to 1999 levels. In addition, regional
                        production offices in Lafayette, Louisiana and Tyler,
                        Texas have been closed along with the Petroleum
                        Technology Center in Littleton, Colorado.

                            The above discussion includes forward-looking
                        statements with respect to 2001 worldwide liquid
                        hydrocarbon production and natural gas volumes, the
                        acquisition of Pennaco, commencement of upstream
                        projects, and the Gulf of Mexico drilling program. Some
                        factors that could potentially affect worldwide liquid
                        hydrocarbon production/gas volumes, upstream projects,
                        and the drilling program include: pricing, worldwide
                        supply and demand for petroleum products, amount of
                        capital available for exploration and development,
                        regulatory constraints, reserve estimates, reserve
                        replacement rates, production decline rates of mature
                        fields, timing of commencing production from new wells,
                        timing and results of future development drilling,
                        drilling rig availability, the completion of the merger
                        with Pennaco, future acquisitions of producing
                        properties, and other geological, operating and economic
                        considerations. In addition, development of new
                        production properties in countries outside the United
                        States may require protracted negotiations with host
                        governments and is frequently subject to political
                        considerations, such as tax regulations, which could
                        adversely affect the timing and economics of projects. A
                        factor that could affect the Pennaco acquisition is
                        successful completion of the merger. These factors
                        (among others) could cause actual results to differ
                        materially from those set forth in the forward-looking
                        statements.

                            Downstream income of the Marathon Group is largely
                        dependent upon refined product margins, which reflect
                        the difference between the selling prices of refined
                        products and the cost of raw materials refined and
                        manufacturing costs. Refined product margins have been
                        historically volatile and vary with the level of
                        economic activity in the various marketing areas, the
                        regulatory climate, crude oil costs, manufacturing
                        costs, logistical limitations and the available supply
                        of crude oil and refined products.

                            In 2000, MAP, CMS Energy Corporation, and TEPPCO
                        Partners, L.P. formed a limited liability company with
                        equal ownership to operate an interstate refined
                        petroleum products pipeline extending from the U.S. Gulf
                        of Mexico to the Midwest. The new company plans to build
                        a 74-mile, 24-inch diameter pipeline connecting TEPPCO's
                        facility in Beaumont, Texas, with an existing 720-mile,
                        26-inch diameter pipeline extending from Longville,
                        Louisiana to Bourbon, Illinois. In addition, a two
                        million barrel terminal storage facility will be
                        constructed. The system will be called Centennial
                        Pipeline and will connect with existing MAP
                        transportation assets and other common carrier lines.
                        Construction is expected to be completed in the fourth
                        quarter of 2001.

                            A MAP subsidiary, Ohio River Pipe Line LLC ("ORPL"),
                        plans to build a pipeline from Kenova, West Virginia to
                        Columbus, Ohio. ORPL is a common carrier pipeline
                        company and the pipeline will be an interstate common
                        carrier pipeline. The pipeline is expected to initially
                        move about 50,000 bpd of refined petroleum into the
                        central Ohio region. The pipeline is currently expected
                        to be operational in mid-2002. The startup of this
                        pipeline is largely dependent on obtaining the final
                        regulatory approvals, obtaining the necessary
                        rights-of-way, of which approximately 95 percent have
                        been obtained to date, and completion of construction.
                        ORPL is still negotiating with a few landowners to
                        obtain the

M-36


                        Management's Discussion and Analysis continued

                        remaining rights-of-way. Where necessary, ORPL has filed
                        condemnation actions to acquire some rights-of-way.
                        These actions are at various stages of litigation and
                        appeal with several recent decisions supporting ORPL's
                        use of eminent domain.

                            MAP is constructing a delayed coker unit at its
                        Garyville, Louisiana refinery. This unit will allow for
                        the use of heavier, lower cost crude and reduce the
                        production of heavy fuel oil. To supply this new unit,
                        MAP reached an agreement with P.M.I. Comercio
                        Internacional, S.A. de C.V., (PMI), an affiliate of
                        Petroleos Mexicanos, (PEMEX), to purchase approximately
                        90,000 bpd of heavy Mayan crude oil. This is a
                        multi-year contract, which will begin upon completion of
                        the delayed coker unit which is scheduled in the fall of
                        2001. In addition, a project to increase light product
                        output is underway at MAP's Robinson, Illinois refinery
                        and is expected to be completed in the second quarter of
                        2001.

                            MAP initiated a program for 2000 to dispose of
                        approximately 270 non-core SSA retail outlets in the
                        Midwest and Southeast. At the end of this program
                        through December 31, 2000, 159 stores, which comprise
                        about 7 percent of MAP's owned and operated SSA retail
                        network, had been sold. MAP will continue to sell
                        additional SSA stores as part of its ongoing store
                        development process.

                            The above discussion includes forward-looking
                        statements with respect to pipeline and refinery
                        improvement projects. Some factors that could
                        potentially cause actual results to differ materially
                        from present expectations include the price of petroleum
                        products, levels of cash flow from operations, obtaining
                        the necessary construction and environmental permits,
                        unforeseen hazards such as weather conditions, obtaining
                        the necessary rights-of-way, outcome of pending
                        litigation, and regulatory approval constraints. These
                        factors (among others) could cause actual results to
                        differ materially from those set forth in the
                        forward-looking statements.

                        Accounting Standards

                            In the fourth quarter of 2000, USX adopted the
                        following accounting pronouncements primarily related to
                        the classification of items in the statement of
                        operations. The adoption of these new pronouncements had
                        no net effect on the financial position or results of
                        operations of the Marathon Group, although they required
                        reclassifications of certain amounts in the statement of
                        operations, including all prior periods presented.

                            .  In December 1999, the Securities and Exchange
                               Commission ("SEC") issued Staff Accounting
                               Bulletin No. 101 (SAB 101) "Revenue Recognition
                               in Financial Statements", which summarizes the
                               SEC staff's interpretations of generally accepted
                               accounting principles related to revenue
                               recognition and classification.

                            .  In 2000, the Emerging Issues Task Force of the
                               Financial Accounting Standards Board (EITF)
                               issued EITF Consensus No. 99-19 "Reporting
                               Revenue Gross as a Principal versus Net as an
                               Agent", which addresses whether certain items
                               should be reported as a reduction of revenue or
                               as a component of both revenues and cost of
                               revenues, and EITF Consensus No. 00-10
                               "Accounting for Shipping and Handling Fees and
                               Costs", which addresses the classification of
                               costs incurred for shipping goods to customers.

                            In June 1998, the Financial Accounting Standards
                        Board issued Statement of Financial Accounting Standards
                        No. 133, "Accounting for Derivative Instruments and
                        Hedging Activities: (SFAS No. 133), which later was
                        amended by SFAS Nos. 137 and 138. This Standard requires
                        recognition of all derivatives as either assets or
                        liabilities at fair value. Changes in fair value will be
                        reflected in either current period net income or other
                        comprehensive income, depending on the designation of
                        the derivative instrument. The Marathon Group may elect
                        not to designate a derivative instrument as a hedge even
                        if the strategy would be expected to qualify for hedge
                        accounting treatment. The adoption of SFAS No. 133 will
                        change the timing of recognition for derivative gains
                        and losses as compared to previous accounting standards.

                            The Marathon Group will adopt the Standard effective
                        January 1, 2001. The transition adjustment resulting
                        from the adoption of SFAS No. 133 will be reported as a
                        cumulative effect of a change in accounting principle.
                        The unfavorable cumulative effect on net income, net of
                        tax, is expected to approximate $9 million. The
                        unfavorable cumulative effect on other comprehensive
                        income, net of tax, will approximate $7 million. The
                        amounts reported as other comprehensive income will be
                        reflected in net income when the anticipated physical
                        transactions are consummated. It is not possible to
                        estimate the effect that this Standard will have on
                        future results of operations.

                                                                            M-37


                        Quantitative and Qualitative Disclosures About Market
                        Risk

                        Management Opinion Concerning Derivative Instruments

                            USX uses commodity-based and foreign currency
                        derivative instruments to manage its price risk.
                        Management has authorized the use of futures, forwards,
                        swaps and options to manage exposure to price
                        fluctuations related to the purchase, production or sale
                        of crude oil, natural gas, refined products, and
                        nonferrous metals. For transactions that qualify for
                        hedge accounting, the resulting gains or losses are
                        deferred and subsequently recognized in income from
                        operations, in the same period as the underlying
                        physical transaction. Derivative instruments used for
                        trading and other activities are marked-to-market and
                        the resulting gains or losses are recognized in the
                        current period in income from operations. While USX's
                        risk management activities generally reduce market risk
                        exposure due to unfavorable commodity price changes for
                        raw material purchases and products sold, such
                        activities can also encompass strategies that assume
                        price risk.

                            Management believes that use of derivative
                        instruments along with risk assessment procedures and
                        internal controls does not expose the Marathon Group to
                        material risk. The use of derivative instruments could
                        materially affect the Marathon Group's results of
                        operations in particular quarterly or annual periods.
                        However, management believes that use of these
                        instruments will not have a material adverse effect on
                        financial position or liquidity. For a summary of
                        accounting policies related to derivative instruments,
                        see Note 2 to the Marathon Group Financial Statements.

                        Commodity Price Risk and Related Risks

                            In the normal course of its business, the Marathon
                        Group is exposed to market risk or price fluctuations
                        related to the purchase, production or sale of crude
                        oil, natural gas and refined products. To a lesser
                        extent, the Marathon Group is exposed to the risk of
                        price fluctuations on natural gas liquids and petroleum
                        feedstocks used as raw materials.

                            The Marathon Group's market risk strategy has
                        generally been to obtain competitive prices for its
                        products and services and allow operating results to
                        reflect market price movements dictated by supply and
                        demand. However, the Marathon Group uses fixed-price
                        contracts and derivative commodity instruments to manage
                        a relatively small portion of its commodity price risk.

                        The Marathon Group uses fixed-price contracts for
                        portions of its natural gas production to manage
                        exposure to fluctuations in natural gas prices. Certain
                        derivative commodity instruments have the effect of
                        restoring the equity portion of fixed-price sales of
                        natural gas to variable market-based pricing. These
                        instruments are used as part of the Marathon Group's
                        overall risk management programs.

M-38


                        Quantitative and Qualitative Disclosures About Market
                        Risk continued

                            Sensitivity analyses of the incremental effects on
                        pretax income of hypothetical 10% and 25% changes in
                        commodity prices for open derivative commodity
                        instruments as of December 31, 2000 and December 31,
                        1999, are provided in the following table:(a)



                        (Dollars in millions)
                        ------------------------------------------------------------------------------------------------------------
                                                                                               Incremental Decrease in
                                                                                              Pretax Income Assuming a
                                                                                                 Hypothetical Price
                                                                                                    Change of/(a)/
                                                                                         2000                       1999
                        Derivative Commodity Instruments                           10%           25%          10%          25%
                        ------------------------------------------------------------------------------------------------------------
                                                                                                           
                        Marathon Group/(b)(c)/:
                         Crude oil/(d)/
                           Trading                                              $      -     $     - /(e)/ $    1.3    $   7.7 /(e)/
                           Other than trading                                        9.1        27.2 /(e)/     16.5       54.0 /(e)/
                         Natural gas/(d)/
                           Trading                                                     -           - /(e)/        -          - /(f)/
                           Other than trading                                       20.2        50.6 /(e)/      4.7       16.8 /(f)/
                         Refined products/(d)/
                           Trading                                                     -           - /(e)/        -          - /(e)/
                           Other than trading                                        6.1        16.5 /(e)/      8.4       23.8 /(e)/
                        ------------------------------------------------------------------------------------------------------------


                        /(a)/ Gains and losses on derivative commodity
                              instruments are generally offset by price changes
                              in the underlying commodity. Effects of these
                              offsets are not reflected in the sensitivity
                              analyses. Amounts reflect the estimated
                              incremental effect on pretax income of
                              hypothetical 10% and 25% changes in closing
                              commodity prices for each open contract position
                              at December 31, 2000 and December 31, 1999.
                              Marathon Group management evaluates their
                              portfolio of derivative commodity instruments on
                              an ongoing basis and adds or revises strategies to
                              reflect anticipated market conditions and changes
                              in risk profiles. Changes to the portfolio
                              subsequent to December 31, 2000, would cause
                              future pretax income effects to differ from those
                              presented in the table.
                        /(b)/ The number of net open contracts varied throughout
                              2000, from a low of 12,252 contracts at July 5, to
                              a high of 34,554 contracts at October 25, and
                              averaged 21,875 for the year. The derivative
                              commodity instruments used and hedging positions
                              taken also varied throughout 2000, and will
                              continue to vary in the future. Because of these
                              variations in the composition of the portfolio
                              over time, the number of open contracts, by
                              itself, cannot be used to predict future income
                              effects.
                        /(c)/ The calculation of sensitivity amounts for basis
                              swaps assumes that the physical and paper indices
                              are perfectly correlated. Gains and losses on
                              options are based on changes in intrinsic value
                              only.
                        /(d)/ The direction of the price change used in
                              calculating the sensitivity amount for each
                              commodity reflects that which would result in the
                              largest incremental decrease in pretax income when
                              applied to the derivative commodity instruments
                              used to hedge that commodity.
                        /(e)/ Price increase.
                        /(f)/ Price decrease.

                            In total, Marathon's exploration and production
                        operations recorded net pretax other than trading
                        activity losses of approximately $34 million in 2000,
                        gains of $3 million in 1999 and losses of $3 million in
                        1998.

                            Marathon's refining, marketing and transportation
                        operations generally use derivative commodity
                        instruments to lock-in costs of certain crude oil and
                        other feedstocks, to protect carrying values of
                        inventories and to protect margins on fixed-price sales
                        of refined products. Marathon's refining, marketing and
                        transportation operations recorded net pretax other than
                        trading activity losses, net of the 38% minority
                        interest in MAP, of approximately $116 million in 2000,
                        and net pretax other than trading activity gains, net of
                        the 38% minority interest in MAP, of $8 million in 1999
                        and $28 million in 1998. Marathon's refining, marketing
                        and transportation operations used derivative
                        instruments for trading activities and recorded net
                        pretax trading activity losses, net of the 38% minority
                        interest in MAP, of $11 million in 2000 and net pretax
                        trading activity gains, net of the 38% minority interest
                        in MAP, of $5 million in 1999.

                            The Marathon Group is subject to basis risk, caused
                        by factors that affect the relationship between
                        commodity futures prices reflected in derivative
                        commodity instruments and the cash market price of the
                        underlying commodity. Natural gas transaction prices are
                        frequently based on industry reference prices that may
                        vary from prices experienced in local markets. For
                        example, New York Mercantile Exchange ("NYMEX")
                        contracts for natural gas are priced at Louisiana's
                        Henry Hub, while the underlying quantities of natural
                        gas may be produced and sold in the Western United
                        States at prices

                                                                            M-39


                        Quantitative and Qualitative Disclosures About Market
                        Risk continued

                        that do not move in strict correlation with NYMEX
                        prices. To the extent that commodity price changes in
                        one region are not reflected in other regions,
                        derivative commodity instruments may no longer provide
                        the expected hedge, resulting in increased exposure to
                        basis risk. These regional price differences could yield
                        favorable or unfavorable results. OTC transactions are
                        being used to manage exposure to a portion of basis
                        risk.

                            The Marathon Group is subject to liquidity risk,
                        caused by timing delays in liquidating contract
                        positions due to a potential inability to identify a
                        counterparty willing to accept an offsetting position.
                        Due to the large number of active participants,
                        liquidity risk exposure is relatively low for
                        exchange-traded transactions.

                        Interest Rate Risk

                            USX is subject to the effects of interest rate
                        fluctuations on certain of its non-derivative financial
                        instruments. A sensitivity analysis of the projected
                        incremental effect of a hypothetical 10% decrease in
                        year-end 2000 and 1999 interest rates on the fair value
                        of the Marathon Group's specifically attributed
                        non-derivative financial instruments and the Marathon
                        Group's portion of USX's non-derivative financial
                        instruments attributed to both groups, is provided in
                        the following table:



                        (Dollars in millions)
                        -----------------------------------------------------------------------------------------------------------
                        As of December 31,                                                 2000                     1999
                                                                                               Incremental              Incremental
                                                                                               Increase in              Increase in
                                                                                    Fair          Fair         Fair        Fair
                        Non-Derivative Financial Instruments/(a)/                Value/(b)/    Value/(c)/    Value/(b)/  Value/(c)/
                        -----------------------------------------------------------------------------------------------------------
                                                                                                            
                        Financial assets:
                         Investments and long-term receivables/(d)/              $     171    $       -      $   166       $    -
                        Financial liabilities:
                         Long-term debt/(e)(f)/                                  $   2,174    $      86      $ 3,443       $  144
                         Preferred stock of subsidiary/(g)/                            175           15          176           16
                                                                                 --------     --------       -------       ------
                              Total liabilities                                  $   2,349    $     101      $ 3,619       $  160
                        -----------------------------------------------------------------------------------------------------------


                        /(a)/ Fair values of cash and cash equivalents,
                              receivables, notes payable, accounts payable and
                              accrued interest, approximate carrying value and
                              are relatively insensitive to changes in interest
                              rates due to the short-term maturity of the
                              instruments. Accordingly, these instruments are
                              excluded from the table.
                        /(b)/ See Note 22 to the Marathon Group Financial
                              Statements for carrying value of instruments.
                        /(c)/ Reflects, by class of financial instrument, the
                              estimated incremental effect of a hypothetical 10%
                              decrease in interest rates at December 31, 2000
                              and December 31, 1999, on the fair value of USX's
                              non-derivative financial instruments. For
                              financial liabilities, this assumes a 10% decrease
                              in the weighted average yield to maturity of USX's
                              long-term debt at December 31, 2000 and December
                              31, 1999.
                        /(d)/ For additional information, see Note 19 to the
                              Marathon Group Financial Statements.
                        /(e)/ Includes amounts due within one year.
                        /(f)/ Fair value was based on market prices where
                              available, or current borrowing rates for
                              financings with similar terms and maturities. For
                              additional information, see Note 12 to the
                              Marathon Group Financial Statements.
                        /(g)/ See Note 22 to the USX Consolidated Financial
                              Statements.

                            At December 31, 2000, USX's portfolio of long-term
                        debt was comprised primarily of fixed-rate instruments.
                        Therefore, the fair value of the portfolio is relatively
                        sensitive to effects of interest rate fluctuations. This
                        sensitivity is illustrated by the $86 million increase
                        in the fair value of long-term debt assuming a
                        hypothetical 10% decrease in interest rates. However,
                        USX's sensitivity to interest rate declines and
                        corresponding increases in the fair value of its debt
                        portfolio would unfavorably affect USX's results and
                        cash flows only to the extent that USX elected to
                        repurchase or otherwise retire all or a portion of its
                        fixed-rate debt portfolio at prices above carrying
                        value.

                        Foreign Currency Exchange Rate Risk

                            USX is subject to the risk of price fluctuations
                        related to anticipated revenues and operating costs,
                        firm commitments for capital expenditures and existing
                        assets or liabilities denominated in currencies other
                        than U.S. dollars. USX has not generally used derivative
                        instruments to manage this risk. However, USX has made
                        limited use of forward currency contracts to manage
                        exposure to certain currency price fluctuations. At
                        December 31, 2000, USX had open Canadian dollar forward
                        purchase

M-40


                        Quantitative and Qualitative Disclosures About Market
                        Risk continued

                        contracts with a total carrying value of approximately
                        $14 million compared to $52 million at December 31,
                        1999. A 10% increase in the December 31, 2000, Canadian
                        dollar to U.S. dollar forward rate, would result in a
                        charge to income of approximately $1 million. Last year,
                        a 10% increase in the December 31, 1999, Canadian dollar
                        to U.S. dollar forward rate, would have resulted in a
                        charge to income of $5 million. The entire amount of
                        these contracts is attributed to the Marathon Group.

                        Equity Price Risk

                            At December 31, 2000, the Marathon Group had no
                        material exposure to equity price risk.

                        Safe Harbor

                            The Marathon Group's quantitative and qualitative
                        disclosures about market risk include forward-looking
                        statements with respect to management's opinion about
                        risks associated with the Marathon Group's use of
                        derivative instruments. These statements are based on
                        certain assumptions with respect to market prices and
                        industry supply of and demand for crude oil, natural
                        gas, refined products and other feedstocks. To the
                        extent that these assumptions prove to be inaccurate,
                        future outcomes with respect to the Marathon Group's
                        hedging programs may differ materially from those
                        discussed in the forward-looking statements.

                                                                            M-41


                 U. S. Steel Group

                      Index to Financial Statements, Supplementary Data,
                      Management's Discussion and Analysis, and Quantitative and
                      Qualitative Disclosures About Market Risk



                                                                                                                        Page
                                                                                                                        ----
                                                                                                                     
                      Management's Report............................................................................   S-1

                      Audited Financial Statements:
                       Report of Independent Accountants.............................................................   S-1
                       Statement of Operations.......................................................................   S-2
                       Balance Sheet.................................................................................   S-3
                       Statement of Cash Flows.......................................................................   S-4
                       Notes to Financial Statements.................................................................   S-5

                      Selected Quarterly Financial Data..............................................................   S-22

                      Principal Unconsolidated Affiliates............................................................   S-22

                      Supplementary Information......................................................................   S-22

                      Five-Year Operating Summary ...................................................................   S-23

                      Five-Year Financial Summary....................................................................   S-24

                      Management's Discussion and Analysis...........................................................   S-25

                      Quantitative and Qualitative Disclosures About Market Risk.....................................   S-38



                        Management's Report

                        The accompanying financial statements of the U. S. Steel
                        Group are the responsibility of and have been prepared
                        by USX Corporation (USX) in conformity with accounting
                        principles generally accepted in the United States. They
                        necessarily include some amounts that are based on best
                        judgments and estimates. The U. S. Steel Group financial
                        information displayed in other sections of this report
                        is consistent with these financial statements.
                             USX seeks to assure the objectivity and integrity
                        of its financial records by careful selection of its
                        managers, by organizational arrangements that provide an
                        appropriate division of responsibility and by
                        communications programs aimed at assuring that its
                        policies and methods are understood throughout the
                        organization.
                             USX has a comprehensive formalized system of
                        internal accounting controls designed to provide
                        reasonable assurance that assets are safeguarded and
                        that financial records are reliable. Appropriate
                        management monitors the system for compliance, and the
                        internal auditors independently measure its
                        effectiveness and recommend possible improvements
                        thereto. In addition, as part of their audit of the
                        financial statements, USX's independent accountants, who
                        are elected by the stockholders, review and test the
                        internal accounting controls selectively to establish a
                        basis of reliance thereon in determining the nature,
                        extent and timing of audit tests to be applied.
                             The Board of Directors pursues its oversight role
                        in the area of financial reporting and internal
                        accounting control through its Audit Committee. This
                        Committee, composed solely of nonmanagement directors,
                        regularly meets (jointly and separately) with the
                        independent accountants, management and internal
                        auditors to monitor the proper discharge by each of its
                        responsibilities relative to internal accounting
                        controls and the consolidated and group financial
                        statements.




                                                                                                       
                        Thomas J. Usher                             Robert M. Hernandez                      Larry G. Schultz
                        Chairman, Board of Directors &              Vice Chairman &                          Vice President-
                        Chief Executive Officer                     Chief Financial Officer                  Accounting



                        Report of Independent Accountants

                        To the Stockholders of USX Corporation:

                        In our opinion, the accompanying financial statements
                        appearing on pages S-2 through S-21 present fairly, in
                        all material respects, the financial position of the U.
                        S. Steel Group at December 31, 2000 and 1999, and the
                        results of its operations and its cash flows for each of
                        the three years in the period ended December 31, 2000,
                        in conformity with accounting principles generally
                        accepted in the United States of America. These
                        financial statements are the responsibility of USX's
                        management; our responsibility is to express an opinion
                        on these financial statements based on our audits. We
                        conducted our audits of these statements in accordance
                        with auditing standards generally accepted in the United
                        States of America, which require that we plan and
                        perform the audit to obtain reasonable assurance about
                        whether the financial statements are free of material
                        misstatement. An audit includes examining, on a test
                        basis, evidence supporting the amounts and disclosures
                        in the financial statements, assessing the accounting
                        principles used and significant estimates made by
                        management, and evaluating the overall financial
                        statement presentation. We believe that our audits
                        provide a reasonable basis for our opinion.
                             The U. S. Steel Group is a business unit of USX
                        Corporation (as described in Note 1, page S-5);
                        accordingly, the financial statements of the U. S. Steel
                        Group should be read in connection with the consolidated
                        financial statements of USX Corporation.




                        PricewaterhouseCoopers LLP
                        600 Grant Street, Pittsburgh, Pennsylvania 15219-2794
                        February 7, 2001

                                                                             S-1


                        Statement of Operations



                        (Dollars in millions)                                                    2000         1999         1998
                       -----------------------------------------------------------------------------------------------------------
                                                                                                              
                        Revenues and other income:
                         Revenues                                                            $   6,090    $   5,536    $   6,378
                         Income (loss) from investees                                               (8)         (89)          46
                         Net gains on disposal of assets                                            46           21           54
                         Other income (loss)                                                         4            2           (1)
                                                                                              ---------    ---------    ---------
                              Total revenues and other income                                    6,132        5,470        6,477
                                                                                              ---------    ---------    ---------
                        Costs and expenses:
                         Cost of revenues (excludes items shown below)                           5,656        5,084        5,604
                         Selling, general and administrative expenses (credits) (Note 12)         (223)        (283)        (201)
                         Depreciation, depletion and amortization                                  360          304          283
                         Taxes other than income taxes                                             235          215          212
                                                                                              ---------    ---------    ---------
                              Total costs and expenses                                           6,028        5,320        5,898
                                                                                              ---------    ---------    ---------
                        Income from operations                                                     104          150          579
                        Net interest and other financial costs (Note 7)                            105           74           42
                                                                                              ---------    ---------    ---------
                        Income (loss) before income taxes and extraordinary losses                  (1)          76          537
                        Provision for income taxes (Note 15)                                        20           25          173
                                                                                              ---------    ---------    ---------
                        Income (loss) before extraordinary losses                                  (21)          51          364
                        Extraordinary losses (Note 6)                                                -            7            -
                                                                                              ---------    ---------    ---------
                        Net income (loss)                                                          (21)          44          364
                        Dividends on preferred stock                                                 8            9            9
                                                                                              ---------    ---------    ---------
                        Net income (loss) applicable to Steel Stock                          $     (29)   $      35    $     355
                       -----------------------------------------------------------------------------------------------------------

                        Income Per Common Share Applicable to Steel Stock



                                                                                                2000         1999         1998
                       -----------------------------------------------------------------------------------------------------------
                                                                                                              
                        Basic:
                         Income (loss) before extraordinary losses                           $    (.33)   $     .48    $    4.05
                         Extraordinary losses                                                        -          .08            -
                                                                                              ---------    ---------    ---------
                         Net income (loss)                                                   $    (.33)   $     .40    $    4.05
                        Diluted:
                         Income (loss) before extraordinary losses                           $    (.33)   $     .48    $    3.92
                         Extraordinary losses                                                        -          .08            -
                                                                                              ---------    ---------    ---------
                         Net income (loss)                                                   $    (.33)   $     .40    $    3.92
                       -----------------------------------------------------------------------------------------------------------

                       See Note 21, for a description and computation of income
                       per common share. The accompanying notes are an integral
                       part of these financial statements.

S-2


                        Balance Sheet



                        (Dollars in millions)                                         December 31           2000           1999
                       -----------------------------------------------------------------------------------------------------------
                                                                                                              
                        Assets

                        Current assets:
                         Cash and cash equivalents                                                        $     219    $      22
                         Receivables, less allowance for doubtful accounts
                           of $57 and $10                                                                       627          488
                         Receivables subject to a security interest (Note 11)                                   350          350
                         Income taxes receivable (Note 13)                                                      364           97
                         Inventories (Note 14)                                                                  946          743
                         Deferred income tax benefits (Note 15)                                                 201          281
                         Other current assets                                                                    10            -
                                                                                                           ---------    ---------
                              Total current assets                                                            2,717        1,981

                        Investments and long-term receivables,
                         less reserves of $38 and $3 (Notes 13 and 16)                                          536          572
                        Property, plant and equipment - net (Note 23)                                         2,739        2,516
                        Prepaid pensions (Note 12)                                                            2,672        2,404
                        Other noncurrent assets                                                                  47           52
                                                                                                           ---------    ---------
                              Total assets                                                                $   8,711    $   7,525
                       -----------------------------------------------------------------------------------------------------------
                        Liabilities

                        Current liabilities:
                         Notes payable                                                                    $      70    $       -
                         Accounts payable                                                                       760          757
                         Payroll and benefits payable                                                           202          322
                         Accrued taxes                                                                          173          177
                         Accrued interest                                                                        47           15
                         Long-term debt due within one year (Note 11)                                           139           13
                                                                                                           ---------    ---------
                              Total current liabilities                                                       1,391        1,284

                        Long-term debt (Note 11)                                                              2,236          902
                        Deferred income taxes (Note 15)                                                         666          348
                        Employee benefits (Note 12)                                                           1,767        2,245
                        Deferred credits and other liabilities                                                  483          441
                        Preferred stock of subsidiary (Note 10)                                                  66           66
                        USX obligated mandatorily redeemable convertible preferred
                         securities of a subsidiary trust holding solely junior subordinated
                         convertible debentures of USX (Note 18)                                                183          183

                        Stockholders' Equity (Note 19)

                        Preferred stock                                                                           2            3
                        Common stockholders' equity                                                           1,917        2,053
                                                                                                           ---------    ---------
                              Total stockholders' equity                                                      1,919        2,056
                                                                                                           ---------    ---------
                              Total liabilities and stockholders' equity                                  $   8,711    $   7,525
                       -----------------------------------------------------------------------------------------------------------

                       The accompanying notes are an integral part of these
                       financial statements.

                                                                             S-3


 Statement of Cash Flows




 (Dollars in millions)                                                   2000         1999         1998
 --------------------------------------------------------------------------------------------------------
                                                                                       
 Increase (decrease) in cash and cash equivalents

 Operating activities:

 Net income (loss)                                                     $    (21)    $     44     $    364
 Adjustments to reconcile to net cash provided
  from (used in) operating activities:
    Extraordinary losses                                                      -            7            -
    Depreciation, depletion and amortization                                360          304          283
    Pensions and other postretirement benefits                             (847)        (256)        (215)
    Deferred income taxes                                                   389          107          158
    Net gains on disposal of assets                                         (46)         (21)         (54)
    Changes in:   Current receivables  - sold                                 -         (320)         (30)
                                       - operating turnover                (263)        (242)         232
                  Inventories                                               (63)         (14)           7
                  Current accounts payable and accrued expenses            (262)         239         (285)
    All other - net                                                         126           72          (80)
                                                                       --------     --------     --------
       Net cash provided from (used in) operating activities               (627)         (80)         380
                                                                       --------     --------     --------

 Investing activities:

 Capital expenditures                                                      (244)        (287)        (310)
 Acquisition of U. S. Steel Kosice s.r.o., net of cash acquired of $59      (10)           -
 Disposal of assets                                                          21           10           21
 Restricted cash - withdrawals                                                2           15           35
                 - deposits                                                  (2)         (17)         (35)
 Investees - investments                                                    (35)         (15)         (73)
           - loans and advances                                             (10)           -           (1)
 All other - net                                                              8            -           14
                                                                       --------     --------     --------
       Net cash used in investing activities                               (270)        (294)        (349)
                                                                       --------     --------     --------
 Financing activities (Note 10):

 Increase in U. S. Steel Group's portion of
  USX consolidated debt                                                   1,208          147           13
 Specifically attributed debt:
  Borrowings                                                                  -          350            -
  Repayments                                                                 (6)         (11)          (4)
 Steel Stock issued                                                           -            -           55
 Preferred stock repurchased                                                (12)          (2)          (8)
 Dividends paid                                                             (97)         (97)         (96)
                                                                       --------     --------     --------
       Net cash provided from (used in) financing activities              1,093          387          (40)
                                                                       --------     --------     --------
 Effect of exchange rate changes on cash                                      1            -            -
                                                                       --------     --------     --------
 Net increase (decrease) in cash and cash equivalents                       197           13           (9)

 Cash and cash equivalents at beginning of year                              22            9           18
                                                                       --------     --------     --------

 Cash and cash equivalents at end of year                              $    219     $     22     $      9
---------------------------------------------------------------------------------------------------------


See Note 9, for supplemental cash flow information.
The accompanying notes are an integral part of these financial statements.

S-4


                        Notes to Financial Statements

1. Basis of Presentation
                        USX Corporation (USX) has two classes of common stock:
                        USX - U. S. Steel Group Common Stock (Steel Stock) and
                        USX - Marathon Group Common Stock (Marathon Stock),
                        which are intended to reflect the performance of the
                        U. S. Steel Group and the Marathon Group, respectively.
                             The financial statements of the U. S. Steel Group
                        include the financial position, results of operations
                        and cash flows for all businesses of USX other than the
                        businesses, assets and liabilities included in the
                        Marathon Group, and a portion of the corporate assets
                        and liabilities and related transactions which are not
                        separately identified with ongoing operating units of
                        USX. The U. S. Steel Group financial statements are
                        prepared using the amounts included in the USX
                        consolidated financial statements. For a description of
                        the U. S. Steel Group's operating segments, see Note 8.
                             Although the financial statements of the U. S.
                        Steel Group and the Marathon Group separately report the
                        assets, liabilities (including contingent liabilities)
                        and stockholders' equity of USX attributed to each such
                        Group, such attribution of assets, liabilities
                        (including contingent liabilities) and stockholders'
                        equity between the U. S. Steel Group and the Marathon
                        Group for the purpose of preparing their respective
                        financial statements does not affect legal title to such
                        assets or responsibility for such liabilities. Holders
                        of Steel Stock and Marathon Stock are holders of common
                        stock of USX, and continue to be subject to all the
                        risks associated with an investment in USX and all of
                        its businesses and liabilities. Financial impacts
                        arising from one Group that affect the overall cost of
                        USX's capital could affect the results of operations and
                        financial condition of the other Group. In addition, net
                        losses of either Group, as well as dividends and
                        distributions on any class of USX Common Stock or series
                        of preferred stock and repurchases of any class of USX
                        Common Stock or series of preferred stock at prices in
                        excess of par or stated value, will reduce the funds of
                        USX legally available for payment of dividends on both
                        classes of Common Stock. Accordingly, the USX
                        consolidated financial information should be read in
                        connection with the U. S. Steel Group financial
                        information.

--------------------------------------------------------------------------------
2. Summary of Principal Accounting Policies

                        Principles applied in consolidation - These financial
                        statements include the accounts of the U. S. Steel
                        Group. The U. S. Steel Group and the Marathon Group
                        financial statements, taken together, comprise all of
                        the accounts included in the USX consolidated financial
                        statements.
                             Investments in entities over which the U. S.
                        Steel Group has significant influence are accounted for
                        using the equity method of accounting and are carried at
                        the U. S. Steel Group's share of net assets plus loans
                        and advances.
                             Investments in companies whose stock is publicly
                        traded are carried generally at market value. The
                        difference between the cost of these investments and
                        market value is recorded in other comprehensive income
                        (net of tax). Investments in companies whose stock has
                        no readily determinable fair value are carried at cost.
                             Income from investees includes the U. S. Steel
                        Group's proportionate share of income from equity method
                        investments. Also, gains or losses from a change in
                        ownership of an unconsolidated investee are recognized
                        in the period of change.

                        Use of estimates - Generally accepted accounting
                        principles require management to make estimates and
                        assumptions that affect the reported amounts of assets
                        and liabilities, the disclosure of contingent assets and
                        liabilities at year-end and the reported amounts of
                        revenues and expenses during the year. Significant items
                        subject to such estimates and assumptions include the
                        carrying value of long-lived assets; valuation
                        allowances for receivables, inventories and deferred
                        income tax assets; environmental liabilities;
                        liabilities for potential tax deficiencies and potential
                        litigation claims and settlements; and assets and
                        obligations related to employee benefits. Additionally,
                        certain estimated liabilities are recorded when
                        management commits to a plan to close an operating
                        facility or to exit a business activity. Actual results
                        could differ from the estimates and assumptions used.

                                                                             S-5


                        Revenue recognition - Revenues are recognized generally
                        when products are shipped or services are provided to
                        customers, the sales price is fixed and determinable,
                        and collectibility is reasonably assured. Costs
                        associated with revenues, including shipping and other
                        transportation costs, are recorded in cost of revenues.

                        Cash and cash equivalents - Cash and cash equivalents
                        include cash on hand and on deposit and investments in
                        highly liquid debt instruments with maturities generally
                        of three months or less.

                        Inventories - Inventories are carried at lower of cost
                        or market. Cost of inventories is determined primarily
                        under the last-in, first-out (LIFO) method.

                        Derivative instruments - The U. S. Steel Group uses
                        commodity-based derivative instruments to manage its
                        exposure to price risk. Management is authorized to use
                        futures, forwards, swaps and options related to the
                        purchase of natural gas, refined products and nonferrous
                        metals used in steel operations. Recorded deferred gains
                        or losses are reflected within other current and
                        noncurrent assets or accounts payable and deferred
                        credits and other liabilities, as appropriate.

                        Property, plant and equipment - Depreciation is
                        generally computed on the straight-line method based
                        upon estimated useful lives. The U. S. Steel Group's
                        method of calculating depreciation for domestic steel
                        producing assets modifies straight-line depreciation
                        based on the level of production. The modification
                        factors for domestic steel producing assets range from a
                        minimum of 85% at a production level below 81% of
                        capability, to a maximum of 105% for a 100% production
                        level. No modification is made at the 95% production
                        level, considered to be the normal long-range level.
                             Depletion of mineral properties is based on rates
                        which are expected to amortize cost over the estimated
                        tonnage of minerals to be removed.
                             The U. S. Steel Group evaluates impairment of its
                        long-lived assets on an individual asset basis or by
                        logical groupings of assets. Assets deemed to be
                        impaired are written down to their fair value, including
                        any related goodwill, using discounted future cash flows
                        and, if available, comparable market values.
                             When property, plant and equipment depreciated on
                        an individual basis are sold or otherwise disposed of,
                        any gains or losses are reflected in income. Gains on
                        disposal of long-lived assets are recognized when
                        earned, which is generally at the time of closing. If a
                        loss on disposal is expected, such losses are recognized
                        when the assets are reclassified as assets held for
                        sale. Proceeds from disposal of property, plant and
                        equipment depreciated on a group basis are credited to
                        accumulated depreciation, depletion and amortization
                        with no immediate effect on income.

                        Major maintenance activities - The U. S. Steel Group
                        incurs planned major maintenance costs primarily for
                        blast furnace relines. Such costs are separately
                        capitalized in property, plant and equipment and are
                        amortized over their estimated useful life, which is
                        generally the period until the nest scheduled relines.

                        Environmental remediation - The U. S. Steel Group
                        provides for remediation costs and penalties when the
                        responsibility to remediate is probable and the amount
                        of associated costs is reasonably determinable.
                        Generally, the timing of remediation accruals coincides
                        with completion of a feasibility study or the commitment
                        to a formal plan of action. Remediation liabilities are
                        accrued based on estimates of known environmental
                        exposure and are discounted in certain instances.

                        Postemployment benefits - The U. S. Steel Group
                        recognizes an obligation to provide postemployment
                        benefits, primarily for disability-related claims
                        covering indemnity and medical payments to certain
                        employees. The obligation for these claims and the
                        related periodic costs are measured using actuarial
                        techniques and assumptions, ___ including an appropriate
                        discount rate, analogous to the required methodology for
                        measuring pension and other postretirement benefit
                        obligations. Actuarial gains and losses are deferred and
                        amortized over future periods.

                        Insurance - The U. S. Steel Group is insured for
                        catastrophic casualty and certain property and business
                        interruption exposures, as well as those risks required
                        to be insured by law or contract. Costs resulting from
                        noninsured losses are charged against income upon
                        occurrence.

                        Reclassifications - Certain reclassifications of prior
                        years' data have been made to conform to 2000
                        classifications.

S-6


3. New Accounting Standards

                        In the fourth quarter of 2000, USX adopted the following
                        accounting pronouncements primarily related to the
                        classification of items in the financial statements. The
                        adoption of these new pronouncements had no net effect
                        on the financial position or results of operations of
                        the U. S. Steel Group, although they required
                        reclassifications of certain amounts in the financial
                        statements, including all prior periods presented.
                            .  In December 1999, the Securities and Exchange
                               Commission (SEC) issued Staff Accounting Bulletin
                               No. 101 (SAB 101) "Revenue Recognition in
                               Financial Statements," which summarizes the SEC
                               staff's interpretations of generally accepted
                               accounting principles related to revenue
                               recognition and classification.
                            .  In 2000, the Emerging Issues Task Force of the
                               Financial Accounting Standards Board (EITF)
                               issued EITF Consensus No. 99-19 "Reporting
                               Revenue Gross as a Principal versus Net as an
                               Agent," which addresses whether certain items
                               should be reported as a reduction of revenue or
                               as a component of both revenues and cost of
                               revenues, and EITF Consensus No. 00-10
                               "Accounting for Shipping and Handling Fees and
                               Costs," which addresses the classification of
                               costs incurred for shipping goods to customers.
                            .  In September 2000, the Financial Accounting
                               Standards Board issued Statement of Financial
                               Accounting Standards No. 140, "Accounting for
                               Transfers and Servicing of Financial Assets and
                               Extinguishments of Liabilities" (SFAS 140). SFAS
                               140 revises the standards for accounting for
                               securitizations and other transfers of financial
                               assets and collateral and requires certain
                               disclosures. USX adopted certain recognition and
                               reclassification provisions of SFAS 140, which
                               were effective for fiscal years ending after
                               December 15, 2000. The remaining provisions of
                               SFAS 140 are effective after March 31, 2001.
                            In June 1998, the Financial Accounting Standards
                        Board issued Statement of Financial Accounting Standards
                        No. 133, "Accounting for Derivative Instruments and
                        Hedging Activities" (SFAS No. 133), which later was
                        amended by SFAS Nos. 137 and 138. This Standard requires
                        recognition of all derivatives as either assets or
                        liabilities at fair value. Changes in fair value will be
                        reflected in either current period net income or other
                        comprehensive income, depending on the designation of
                        the derivative instrument. The U. S. Steel Group may
                        elect not to designate a derivative instrument as a
                        hedge even if the strategy would be expected to qualify
                        for hedge accounting treatment. The adoption of SFAS No.
                        133 will change the timing of recognition for derivative
                        gains and losses as compared to previous accounting
                        standards.
                             The U. S. Steel Group will adopt the Standard
                        effective January 1, 2001. The transition adjustment
                        resulting from the adoption of SFAS No. 133 will be
                        reported as a cumulative effect of a change in
                        accounting principle. The transition adjustment for the
                        U. S. Steel Group is expected to be immaterial. The
                        amounts reported as other comprehensive income will be
                        reflected in net income when the anticipated physical
                        transactions are consummated. It is not possible to
                        estimate the effect that this Standard will have on
                        future results of operations.

--------------------------------------------------------------------------------
4. Corporate Activities

                        Financial activities - As a matter of policy, USX
                        manages most financial activities on a centralized,
                        consolidated basis. Such financial activities include
                        the investment of surplus cash; the issuance, repayment
                        and repurchase of short-term and long-term debt; the
                        issuance, repurchase and redemption of preferred stock;
                        and the issuance and repurchase of common stock.
                        Transactions related primarily to invested cash, short-
                        term and long-term debt (including convertible debt),
                        related net interest and other financial costs, and
                        preferred stock and related dividends are attributed to
                        the U. S. Steel Group and the Marathon Group based upon
                        the cash flows of each group for the periods presented
                        and the initial capital structure of each group. Most
                        financing transactions are attributed to and reflected
                        in the financial statements of the groups. See Note 10,
                        for the U. S. Steel Group's portion of USX's financial
                        activities attributed to the groups. However,
                        transactions such as leases, certain collateralized
                        financings, certain indexed debt instruments, financial
                        activities of consolidated entities which are less than
                        wholly owned by USX and transactions related to
                        securities convertible solely into any one class of
                        common stock are or will be specifically attributed to
                        and reflected in their entirety in the financial
                        statements of the group to which they relate.

                                                                             S-7


                        Corporate general and administrative costs - Corporate
                        general and administrative costs are allocated to the U.
                        S. Steel Group and the Marathon Group based upon
                        utilization or other methods management believes to be
                        reasonable and which consider certain measures of
                        business activities, such as employment, investments and
                        revenues. The costs allocated to the U. S. Steel Group
                        were $25 million in 2000, $17 million in 1999 and $24
                        million in 1998, and primarily consist of employment
                        costs including pension effects, professional services,
                        facilities and other related costs associated with
                        corporate activities.

                        Income taxes - All members of the USX affiliated group
                        are included in the consolidated United States federal
                        income tax return filed by USX. Accordingly, the
                        provision for federal income taxes and the related
                        payments or refunds of tax are determined on a
                        consolidated basis. The consolidated provision and the
                        related tax payments or refunds have been reflected in
                        the U. S. Steel Group and the Marathon Group financial
                        statements in accordance with USX's tax allocation
                        policy. In general, such policy provides that the
                        consolidated tax provision and related tax payments or
                        refunds are allocated between the U. S. Steel Group and
                        the Marathon Group for group financial statement
                        purposes, based principally upon the financial income,
                        taxable income, credits, preferences and other amounts
                        directly related to the respective groups.
                             For tax provision and settlement purposes, tax
                        benefits resulting from attributes (principally net
                        operating losses and various tax credits), which cannot
                        be utilized by one of the groups on a separate return
                        basis but which can be utilized on a consolidated basis
                        in that year or in a carryback year, are allocated to
                        the group that generated the attributes. To the extent
                        that one of the groups is allocated a consolidated tax
                        attribute which, as a result of expiration or otherwise,
                        is not ultimately utilized on the consolidated tax
                        return, the prior years' allocation of such attribute is
                        adjusted such that the effect of the expiration is borne
                        by the group that generated the attribute. Also, if a
                        tax attribute cannot be utilized on a consolidated basis
                        in the year generated or in a carryback year, the prior
                        years' allocation of such consolidated tax effects is
                        adjusted in a subsequent year to the extent necessary to
                        allocate the tax benefits to the group that would have
                        realized the tax benefits on a separate return basis. As
                        a result, the allocated group amounts of taxes payable
                        or refundable are not necessarily comparable to those
                        that would have resulted if the groups had filed
                        separate tax returns.

--------------------------------------------------------------------------------
5. Business Combination

                        On November 24, 2000, USX acquired U. S. Steel Kosice
                        s.r.o. (USSK), which is located in the Slovak Republic.
                        USSK was formed in June 2000 to hold the steel
                        operations and related assets of VSZ a.s. (VSZ), a
                        diversified Slovak corporation. The cash purchase price
                        was $69 million. Additional payments to VSZ of not less
                        than $25 million and up to $75 million are contingent
                        upon the future performance of USSK. Additionally, $325
                        million of debt was included with the acquisition. The
                        acquisition was accounted for under the purchase method
                        of accounting. The 2000 results of operations include
                        the operations of USSK from the date of acquisition.
                             Prior to this transaction, USX and VSZ were equal
                        partners in VSZ U. S. Steel s.r.o. (VSZUSS), a tin mill
                        products manufacturer. The assets of USSK included VSZ's
                        interest in VSZUSS. The acquisition of the remaining
                        interest in VSZUSS was accounted for under the purchase
                        method of accounting. Previously, USX had accounted for
                        its investment in VSZUSS under the equity method of
                        accounting.
                             The following unaudited pro forma data for the U.
                        S. Steel Group includes the results of operations of
                        USSK for 2000 and 1999, giving effect to the acquisition
                        as if it had been consummated at the beginning of the
                        years presented. The pro forma data is based on
                        historical information and does not necessarily reflect
                        the actual results that would have occurred nor is it
                        necessarily indicative of future results of operations.
                        In addition, VSZ did not historically provide carve-out
                        financial information for its steel operations in
                        accordance with generally accepted accounting principles
                        in the United States. Therefore, the U. S. Steel Group
                        made certain estimates and assumptions regarding revenue
                        and costs in the preparation of the following unaudited
                        pro forma data.


                        (In millions)                         Year Ended December 31           2000           1999
                       -----------------------------------------------------------------------------------------------------------
                                                                                                   
                        Revenues and other income                                           $   7,094     $   6,472
                        Income before extraordinary loss                                           57            36
                        Net income                                                                 57            29
                       -----------------------------------------------------------------------------------------------------------


S-8


--------------------------------------------------------------------------------
6. Extraordinary Losses

                        In 1999, USX irrevocably deposited with a trustee the
                        entire 5.5 million common shares it owned in RTI
                        International Metals, Inc. (RTI). The deposit of the
                        shares resulted in the satisfaction of USX's obligation
                        under its 63/4% Exchangeable Notes (indexed debt) due
                        February 1, 2000. Under the terms of the indenture, the
                        trustee exchanged one RTI share for each note at
                        maturity. All shares were required for satisfaction of
                        the indexed debt; therefore, none reverted back to USX.
                             As a result of the above transaction, USX recorded
                        in 1999 an extraordinary loss of $5 million, net of a $3
                        million income tax benefit, representing prepaid
                        interest expense and the write-off of unamortized debt
                        issue costs, and a pretax charge of $22 million,
                        representing the difference between the carrying value
                        of the investment in RTI and the carrying value of the
                        indexed debt, which is included in net gains on disposal
                        of assets. Since USX's investment in RTI was attributed
                        to the U. S. Steel Group, the indexed debt was also
                        attributed to the U. S. Steel Group.
                             In 1999, Republic Technologies International, LLC,
                        an equity investee of USX, recorded an extraordinary
                        loss related to the early extinguishment of debt. As a
                        result, the U. S. Steel Group recorded an extraordinary
                        loss of $2 million, net of a $1 million income tax
                        benefit, representing its share of the extraordinary
                        loss.

--------------------------------------------------------------------------------
7. Other Items



                        (In millions)                                                              2000        1999        1998
                       ---------------------------------------------------------------------------------------------------------
                                                                                                               
                        Net interest and other financial costs

                           Interest and other financial income/(a)/:
                              Interest income                                                    $      3    $      1   $      5
                              Other                                                                     7           -          -
                                                                                                 --------    --------   --------
                                 Total                                                                 10           1          5
                                                                                                 --------    --------   --------
                           Interest and other financial costs/(a)/:
                              Interest incurred                                                        88          45         40
                              Less interest capitalized                                                 3           6          6
                                                                                                 --------    --------   --------
                               Net interest                                                            85          39         34
                              Interest on tax issues                                                   11          15         16
                              Financial costs on trust preferred securities                            13          13         13
                              Financial costs on preferred stock of subsidiary                          5           5          5
                              Amortization of discounts                                                 1           1          2
                              Expenses on sales of accounts receivable                                  -          15         21
                              Adjustment to settlement value of indexed debt                            -         (13)       (44)
                                                                                                 --------    --------   --------
                                 Total                                                                115          75         47
                                                                                                 --------    --------   --------
                           Net interest and other financial costs/(a)/                           $    105    $     74   $     42
                       -----------------------------------------------------------------------------------------------------------
                       /(a)/ See Note 4, for discussion of USX net interest and other financial costs attributable to the U. S.
                             Steel Group.
                       -----------------------------------------------------------------------------------------------------------


                        Foreign currency transactions

                           For 2000, the aggregate foreign currency transaction
                           gain included in determining net income was $7
                           million. There were no foreign currency transaction
                           gains or losses in 1999 and 1998.

--------------------------------------------------------------------------------
8. Segment Information

                        The U. S. Steel Group consists of two reportable
                        operating segments: 1) Domestic Steel and 2) U. S. Steel
                        Kosice (USSK). Domestic Steel includes the United States
                        operations of U. S. Steel, while USSK includes the U. S.
                        Steel Kosice operations in the Slovak Republic. Domestic
                        Steel is engaged in the domestic production and sale of
                        steel mill products, coke and taconite pellets; the
                        management of mineral resources; coal mining;
                        engineering and consulting services; and real estate
                        development and management. USSK is engaged in the
                        production and sale of steel mill products and coke and
                        primarily serves European markets.
                             Segment income represents income from operations
                        allocable to both operating segments and does not
                        include net interest and other financial costs and
                        provisions for income taxes. Additionally, the following
                        items are not allocated to operating segments:
                               .  Net pension credits associated with pension
                                  plan assets and liabilities
                               .  Certain costs related to former U. S. Steel
                                  Group business activities
                               .  USX corporate general and administrative
                                  costs. These costs primarily consist of
                                  employment costs including pension effects,
                                  professional services, facilities and other
                                  related costs associated with corporate
                                  activities.
                               .  Certain other items not allocated to operating
                                  segments for business performance reporting
                                  purposes (see reconcilement schedule on S-10)
                             Information on assets by segment is not provided as
                        it is not reviewed by the chief operating decision
                        maker.

                                                                             S-9




                              The following represents the operations of the U.S. Steel Group:

                        (In millions)                                              Domestic Steel        USSK              Total
                       ---------------------------------------------------------------------------------------------------------
                                                                                                             
                        2000
                        Revenues and other income:
                         Customer                                                   $   5,981        $       92        $   6,073
                         Intergroup/(a)/                                                   17                 -               17
                         Equity in losses of unconsolidated investees                      (8)                -               (8)
                         Other                                                             50                 -               50
                                                                                    ---------        ----------        ---------
                            Total revenues and other income                         $   6,040        $       92        $   6,132
                                                                                    =========        ==========        =========
                        Segment income                                              $      23        $        2        $      25
                        Significant noncash items included in segment income -
                         Depreciation, depletion and amortization/(b)/                    285                 4              289
                        Capital expenditures                                              239                 5              244
                       ---------------------------------------------------------------------------------------------------------
                        1999
                        Revenues and other income:
                         Customer                                                   $   5,519        $        -        $   5,519
                         Intergroup/(a)/                                                   17                 -               17
                         Equity in losses of unconsolidated investees                     (43)                -              (43)
                         Other                                                             46                 -               46
                                                                                    ---------        ----------        ---------
                            Total revenues and other income                         $   5,539        $        -        $   5,539
                                                                                    =========        ==========        =========
                        Segment income                                              $      91        $        -        $      91
                        Significant noncash items included in segment income -
                         Depreciation, depletion and amortization                         304                 -              304
                        Capital expenditures/(c)/                                         286                 -              286
                       ---------------------------------------------------------------------------------------------------------
                        1998
                        Revenues and other income:
                         Customer                                                   $   6,374        $        -        $   6,374
                         Intergroup/(a)/                                                    2                 -                2
                         Equity in earnings of unconsolidated investees                    46                 -               46
                         Other                                                             55                 -               55
                                                                                    ---------        ----------        ---------
                            Total revenues and other income                         $   6,477        $        -        $   6,477
                                                                                    =========        ==========        =========
                        Segment income                                              $     517        $        -        $     517
                        Significant noncash items included in segment income -
                         Depreciation, depletion and amortization                         283                 -              283
                        Capital expenditures/(c)/                                         305                 -              305
                       ---------------------------------------------------------------------------------------------------------
                        /(a)/  Intergroup revenues and transfers were conducted under terms comparable to those with unrelated
                               parties.
                        /(b)/  Difference between segment total and group total represents amounts for impairment of coal assets.
                        /(c)/  Differences  between  segment  total  and  group  total  represent  amounts  related  to  corporate
                               administrative activities.

                            The following  schedules  reconcile  segment amounts to amounts  reported in the U. S. Steel Group's
                        financial statements:

                        (In millions)                                                   2000             1999              1998
                       ----------------------------------------------------------------------------------------------------------
                        Revenues and Other Income:
                         Revenues and other income of reportable segments           $   6,132        $    5,539        $   6,477
                         Items not allocated to segments:
                           Impairment and other costs related to an
                            investment in an equity investee                                -               (47)               -
                           Loss on investment in RTI stock used
                            to satisfy indexed debt obligations                             -               (22)               -
                                                                                    ---------        ----------        ---------
                            Total Group revenues and other income                   $   6,132        $    5,470        $   6,477
                                                                                    =========        ==========        =========
                        Income:
                         Income for reportable segments                             $      25        $       91        $     517
                         Items not allocated to segments:
                           Impairment of coal assets                                      (71)                -                -
                           Impairment and other costs related to an
                            investment in an equity investee                                -               (47)               -
                           Loss on investment in RTI stock used
                            to satisfy indexed debt obligations                             -               (22)               -
                           Administrative expenses                                        (25)              (17)             (24)
                           Net pension credits                                            266               228              186
                           Costs related to former businesses activities                  (91)              (83)            (100)
                                                                                    ---------        ----------        ---------
                            Total Group income from operations                      $     104        $      150        $     579
                       ---------------------------------------------------------------------------------------------------------


S-10


                        Revenues by Product:


                        (In millions)                                                   2000             1999             1998
                       ---------------------------------------------------------------------------------------------------------
                                                                                                              
                        Sheet and semi-finished steel products                      $   3,288        $    3,433        $   3,598
                        Tubular, plate and tin mill products                            1,731             1,140            1,546
                        Raw materials (coal, coke and iron ore)                           626               549              744
                        Other/(a)/                                                        445               414              490
                       ---------------------------------------------------------------------------------------------------------

                        /(a)/ Includes revenue from the sale of steel production
                              by-products, engineering and consulting services,
                              real estate development and resource management.

                        Geographic Area:

                              The information below summarizes the operations in
                        different geographic areas.



                                                                             Revenues and Other Income
                                                                  --------------------------------------------
                                                                     Within            Between
                                                                   Geographic        Geographic
                        (In millions)                 Year            Areas             Areas            Total       Assets/(a)/
                        --------------------------------------------------------------------------------------------------------
                                                                                                        
                        United States                 2000        $    6,027        $       -        $    6,027        $   2,745
                                                      1999             5,452                -             5,452            2,889
                                                      1998             6,460                -             6,460            3,043

                        Slovak Republic               2000                95                -                95              376
                                                      1999                 3                -                 3               60
                                                      1998                 6                -                 6               66

                        Other Foreign Countries       2000                10                -                10               10
                                                      1999                15                -                15                3
                                                      1998                11                -                11                3

                        Total                         2000        $    6,132        $       -        $    6,132        $   3,131
                                                      1999             5,470                -             5,470            2,952
                                                      1998             6,477                -             6,477            3,112
                        --------------------------------------------------------------------------------------------------------
                        /(a)/ Includes property, plant and equipment and investments.



--------------------------------------------------------------------------------------------------------------------------------
9. Supplemental Cash Flow Information

                        (In millions)                                                          2000          1999        1998
                        --------------------------------------------------------------------------------------------------------
                                                                                                              
                        Cash provided from (used in) operating activities included:
                         Interest and other financial costs paid
                           (net of amount capitalized)                                       $     (71)   $     (77)   $     (76)
                         Income taxes refunded (paid), including
                           settlements with the Marathon Group                                      81            3          (29)
                        --------------------------------------------------------------------------------------------------------
                        USX debt attributed to all groups - net:
                         Commercial paper:
                           Issued                                                            $   3,362    $   6,282    $       -
                           Repayments                                                           (3,450)      (6,117)           -
                         Credit agreements:
                           Borrowings                                                              437        5,529       17,486
                           Repayments                                                             (437)      (5,980)     (16,817)
                         Other credit arrangements - net                                           150          (95)          55
                         Other debt:
                           Borrowings                                                                -          319          671
                           Repayments                                                              (54)         (87)      (1,053)
                                                                                             ---------    ---------    ---------
                              Total                                                          $       8    $    (149)   $     342
                        --------------------------------------------------------------------------------------------------------
                         U. S. Steel Group activity                                          $   1,208    $     147    $      13
                         Marathon Group activity                                                (1,200)        (296)         329
                                                                                             ---------    ---------    ---------
                              Total                                                          $       8    $    (149)   $     342
                        --------------------------------------------------------------------------------------------------------
                        Noncash investing and financing activities:
                         Steel Stock issued for dividend reinvestment and
                           employee stock plans                                              $       5    $       2    $       2
                         Disposal of assets:
                           Deposit of RTI common shares in satisfaction of indexed debt              -           56            -
                           Interest in USS/Kobe contributed to Republic                              -           40            -
                           Other disposals of assets - notes or common stock received               14            1            2
                         Business combinations:
                           Acquisition of USSK:
                            Liabilities assumed                                                    568            -            -
                            Contingent consideration payable at present value                       21            -            -
                            Investee liabilities consolidated in step acquisition                    3            -            -
                           Other acquisitions:
                            Liabilities assumed                                                      -           26            -
                            Investee liabilities consolidated in step acquisition                    -           26            -
                        --------------------------------------------------------------------------------------------------------


                                                                            S-11

--------------------------------------------------------------------------------
10. Financial Activities Attributed to Groups



                        The following is the portion of USX financial activities attributed to the U. S. Steel Group. These amounts
                        exclude amounts specifically attributed to the U. S. Steel Group.

                                                                                       U. S. Steel Group     Consolidated USX/(a)/
                                                                                     --------------------    ---------------------
                        (In millions)                             December 31           2000       1999        2000        1999
                        ----------------------------------------------------------------------------------------------------------
                                                                                                           
                        Cash and cash equivalents                                    $    171    $      1    $     364    $      9
                        Other noncurrent assets                                             3           1            7           8
                                                                                     --------    --------    ---------    --------
                           Total assets                                              $    174    $      2    $     371    $     17
                        ----------------------------------------------------------------------------------------------------------
                        Notes payable                                                $     70    $      -    $     150    $      -
                        Accrued interest                                                   45          13           95          95
                        Long-term debt due within one year (Note 11)                      130           7          277          54
                        Long-term debt (Note 11)                                        1,804         466        3,734       3,771
                        Preferred stock of subsidiary                                      66          66          250         250
                                                                                     --------    --------    ---------    --------
                           Total liabilities                                         $  2,115    $    552    $   4,506    $  4,170
                        ----------------------------------------------------------------------------------------------------------
                                                                                      U. S. Steel Group/(b)/    Consolidated USX
                                                                                      ----------------------  --------------------
                        (In millions)                                                 2000     1999     1998  2000    1999    1998
                        ----------------------------------------------------------------------------------------------------------
                        Net interest and other financial costs (Note 7)               $ 59     $ 39     $ 29  $309    $334    $324
                        ----------------------------------------------------------------------------------------------------------

                        /(a)/  For details of USX long-term debt and preferred
                               stock of subsidiary, see Notes 14 and 22,
                               respectively, to the USX consolidated financial
                               statements.
                        /(b)/  The U. S. Steel Group's net interest and other
                               financial costs reflect weighted average effects
                               of all financial activities attributed to all
                               groups.

--------------------------------------------------------------------------------
11. Long-Term Debt



                        The U. S. Steel Group's portion of USX's consolidated long-term debt is as follows:

                                                                                       U. S. Steel Group     Consolidated USX/(a)/
                                                                                     --------------------    ---------------------
                        (In millions)                             December 31           2000       1999        2000        1999
                        ----------------------------------------------------------------------------------------------------------
                                                                                                         
                        Specifically attributed debt/(b)/:
                         Receivables facility                                        $    350    $    350    $     350    $    350
                         Sale-leaseback financing and capital leases                       88          92           95         107
                         Other                                                              3           -            4           1
                                                                                     --------    --------    ---------    --------
                           Total                                                          441         442          449         458
                         Less amount due within one year                                    9           6           10           7
                                                                                     --------    --------    ---------    --------
                           Total specifically attributed long-term debt              $    432    $    436    $     439    $    451
                        ----------------------------------------------------------------------------------------------------------
                        Debt attributed to groups/(c)/                               $  1,946    $    477    $   4,036    $  3,852
                         Less unamortized discount                                         12           4           25          27
                         Less amount due within one year                                  130           7          277          54
                                                                                     --------    --------    ---------    --------
                           Total long-term debt attributed to groups                 $  1,804    $    466    $   3,734    $  3,771
                        ----------------------------------------------------------------------------------------------------------
                        Total long-term debt due within one year                     $    139    $     13    $     287    $     61
                        Total long-term debt due after one year                         2,236         902        4,173       4,222
                        ----------------------------------------------------------------------------------------------------------

                        /(a)/ See Note 14, to the USX consolidated financial
                              statements for details of interest rates,
                              maturities and other terms of long-term debt.
                        /(b)/ As described in Note 4, certain financial
                              activities are specifically attributed only to the
                              U. S. Steel Group and the Marathon Group.
                        /(c)/ Most long-term debt activities of USX Corporation
                              and its wholly owned subsidiaries are attributed
                              to all groups (in total, but not with respect to
                              specific debt issues) based on their respective
                              cash flows (Notes 4, 9 and 10).

S-12


--------------------------------------------------------------------------------
12. Pensions and Other Postretirement Benefits

                        The U. S. Steel Group has noncontributory defined
                        benefit pension plans covering substantially all U.S.
                        employees. Benefits under these plans are based upon
                        years of service and final average pensionable earnings,
                        or a minimum benefit based upon years of service,
                        whichever is greater. In addition, pension benefits are
                        also provided to most U.S. salaried employees based upon
                        a percent of total career pensionable earnings. Certain
                        of these plans provide benefits to USX corporate
                        employees, and the related costs or credits for such
                        employees are allocated to all groups (Note 4). The U.
                        S. Steel Group also participates in multiemployer plans,
                        most of which are defined benefit plans associated with
                        coal operations.
                             The U. S. Steel Group also has defined benefit
                        retiree health care and life insurance plans (other
                        benefits) covering most U.S. employees upon their
                        retirement. Health care benefits are provided through
                        comprehensive hospital, surgical and major medical
                        benefit provisions or through health maintenance
                        organizations, both subject to various cost sharing
                        features. Life insurance benefits are provided to
                        nonunion retiree beneficiaries primarily based on
                        employees' annual base salary at retirement. These plans
                        provide benefits to USX corporate employees, and the
                        related costs for such employees are allocated to all
                        groups (Note 4). For U.S. union retirees, benefits are
                        provided for the most part based on fixed amounts
                        negotiated in labor contracts with the appropriate
                        unions.



                                                                                 Pension Benefits               Other Benefits
                                                                             -------------------------      ----------------------
                        (In millions)                                          2000           1999            2000          1999
                        ----------------------------------------------------------------------------------------------------------
                                                                                                             
                        Change in benefit obligations
                        Benefit obligations at January 1                     $  6,716        $ 7,549        $  1,896      $  2,113
                        Service cost                                               76             87              12            15
                        Interest cost                                             505            473             147           133
                        Plan amendments                                             -            381 /(a)/         -            14
                        Actuarial (gains) losses                                  430           (822)            260          (225)
                        Plan merger and acquisition                                 -             42               -             7
                        Settlements, curtailments and termination benefits          -           (207)              -             -
                        Benefits paid                                            (806)          (787)           (166)         (161)
                                                                             --------        -------        --------      --------
                        Benefit obligations at December 31                   $  6,921        $ 6,716        $  2,149      $  1,896
                        ----------------------------------------------------------------------------------------------------------
                        Change in plan assets
                        Fair value of plan assets at January 1               $  9,995        $10,243        $    281      $    265
                        Actual return on plan assets                              139            729              26             20
                        Acquisition                                                (1)            26               -              1
                        Employer contributions                                      -              -             576 /(b)/       34
                        Trustee distributions/(c)/                                (16)           (14)              -               -
                        Settlements paid                                            -           (207)              -              -
                        Benefits paid from plan assets                           (805)          (782)            (41)           (39)
                                                                             --------        -------        --------      --------
                        Fair value of plan assets at December 31             $  9,312        $ 9,995        $    842      $    281
                        ----------------------------------------------------------------------------------------------------------
                        Funded status of plans at December 31                $  2,391 /(d)/  $ 3,279 /(d)/  $ (1,307)     $ (1,615)
                        Unrecognized net gain from transition                      (2)           (69)              -             -
                        Unrecognized prior service cost                           719            817              12            19
                        Unrecognized actuarial gains                             (462)        (1,639)           (241)         (526)
                        Additional minimum liability                              (19)           (16)              -             -
                                                                             --------        -------        --------      --------
                        Prepaid (accrued) benefit cost                       $  2,627        $ 2,372        $ (1,536)     $ (2,122)
                        ----------------------------------------------------------------------------------------------------------
                        /(a)/ Results primarily from a five-year labor contract with the United Steelworkers of America ratified in
                              August 1999.
                        /(b)/ Includes contributions of $530 million to a Voluntary Employee Benefit Association trust, comprised of
                              $30 million in contractual requirements and an elective contribution of $500 million. Also includes a
                              $30 million elective contribution to the non-union retiree life insurance trust.
                        /(c)/ Represents transfers of excess pension assets to fund retiree health care benefits accounts under
                              Section 420 of the Internal Revenue Code.
                        /(d)/ Includes a plan that has accumulated benefit
                                obligations in excess of plan assets:
                                 Aggregate accumulated benefit obligations   $    (40)       $   (29)
                                 Aggregate projected benefit obligations          (49)           (39)
                                 Aggregate plan assets                              -              -
                        -----------------------------------------------------------------------------------------------------------


                                                                            S-13




                                                                      Pension Benefits                     Other Benefits
                                                                --------------------------       -----------------------------------
                     (In millions)                              2000    1999         1998        2000        1999         1998
                     ---------------------------------------------------------------------------------------------------------------
                                                                                                       
                     Components of net periodic
                      benefit cost (credit)
                     Service cost                              $   76  $   87       $   71       $  12       $  15       $  15
                     Interest cost                                505     473          487         147         133         141
                     Expected return on plan assets              (841)   (781)        (769)        (24)        (21)        (21)
                     Amortization -net transition gain            (67)    (67)         (69)          -           -           -
                                  -prior service costs             98      83           72           4           4           4
                                  -actuarial (gains) losses       (44)      6            6         (29)        (12)        (16)
                     Multiemployer and other plans                  -       -            1           9 /(a)/     7 /(a)/    13 /(a)/
                     Settlement and termination (gains) losses      -     (35)/(b)/     10 /(b)/     -           -           -
                                                               ------  ------       ------       -----       -----       -----
                     Net periodic benefit cost (credit)        $ (273) $ (234)      $ (191)      $ 119       $ 126       $ 136
                     ---------------------------------------------------------------------------------------------------------------

                     /(a)/ Represents payments to a multiemployer health care
                           benefit plan created by the Coal Industry Retiree
                           Health Benefit Act of 1992 based on assigned
                           beneficiaries receiving benefits. The present value
                           of this unrecognized obligation is broadly estimated
                           to be $84 million, including the effects of future
                           medical inflation, and this amount could increase if
                           additional beneficiaries are assigned.
                     /(b)/ Relates primarily to the 1998 voluntary early
                           retirement program.



                                                                                   Pension Benefits          Other Benefits
                                                                                ---------------------     ---------------------
                                                                                   2000        1999         2000        1999
                     ----------------------------------------------------------------------------------------------------------
                                                                                                           
                     Weighted average actuarial assumptions at December 31:
                     Discount rate                                                   7.5%       8.0%         7.5%        8.0%
                     Expected annual return on plan assets                           8.9%       8.5%         8.5%        8.5%
                     Increase in compensation rate                                   4.0%       4.0%         4.0%        4.0%
                     ----------------------------------------------------------------------------------------------------------


                          For measurement purposes, a 7.5% annual rate of
                     increase in the per capita cost of covered health care
                     benefits was assumed for 2001. The rate was assumed to
                     decrease gradually to 5% for 2006 and remain at that
                     level thereafter.
                          A one-percentage-point change in assumed health
                     care cost trend rates would have the following effects:


                                                                                              1-Percentage-      1-Percentage-
                     (In millions)                                                           Point Increase     Point Decrease
                     ----------------------------------------------------------------------------------------------------------
                                                                                                         
                     Effect on total of service and interest cost components                    $    16            $   (14)
                     Effect on other postretirement benefit obligations                             177               (151)
                     ----------------------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------
13. Intergroup Transactions

                     Revenues and purchases - U. S. Steel Group revenues for
                     sales to the Marathon Group totaled $17 million in both
                     2000 and 1999 and $2 million in 1998. U. S. Steel Group
                     purchases from the Marathon Group totaled $60 million,
                     $41 million and $21 million in 2000, 1999 and 1998,
                     respectively. At December 31, 2000 and 1999, U. S. Steel
                     Group receivables included $2 million related to
                     transactions with the Marathon Group. At December 31,
                     2000 and 1999, U. S. Steel Group accounts payable
                     included $1 million and $5 million, respectively,
                     related to transactions with the Marathon Group. These
                     transactions were conducted under terms comparable to
                     those with unrelated parties.

                     Income taxes receivable from/payable to the Marathon
                     Group - At December 31, 2000 and 1999, amounts
                     receivable or payable for income taxes were included in
                     the balance sheet as follows:



                     (In millions)                                                 December 31             2000         1999
                     ----------------------------------------------------------------------------------------------------------
                                                                                                           
                     Current:
                      Income tax receivable                                                            $     364    $      97
                      Accounts payable                                                                         4            1
                     Noncurrent:
                      Investments and long-term receivables                                                   97           97
                     ----------------------------------------------------------------------------------------------------------


                          These amounts have been determined in accordance
                     with the tax allocation policy described in Note 4.
                     Amounts classified as current are settled in cash in the
                     year succeeding that in which such amounts are accrued.
                     Noncurrent amounts represent estimates of intergroup tax
                     effects of certain issues for years that are still under
                     various stages of audit and administrative review. Such
                     tax effects are not settled between the groups until the
                     audit of those respective tax years is closed. The
                     amounts ultimately settled for open tax years will be
                     different than recorded noncurrent amounts based on the
                     final resolution of all of the audit issues for those
                     years.

S-14


--------------------------------------------------------------------------------
14. Inventories



                        (In millions)                                                 December 31           2000           1999
                       -----------------------------------------------------------------------------------------------------------
                                                                                                                 
                        Raw materials                                                                     $     214    $     101
                        Semi-finished products                                                                  429          392
                        Finished products                                                                       210          193
                        Supplies and sundry items                                                                93           57
                                                                                                          ---------    ---------
                              Total                                                                       $     946    $     743
                       ---------------------------------------------------------------------------------------------------------


                             At December 31, 2000 and 1999, respectively, the
                        LIFO method accounted for 91% and 93% of total inventory
                        value. Current acquisition costs were estimated to
                        exceed the above inventory values at December 31 by
                        approximately $380 million and $370 million in 2000 and
                        1999, respectively. Cost of revenues was reduced and
                        income from operations was increased by $3 million in
                        2000 as a result of liquidations of LIFO inventories.

--------------------------------------------------------------------------------
15. Income Taxes

                        Income tax provisions and related assets and liabilities
                        attributed to the U. S. Steel Group are determined in
                        accordance with the USX group tax allocation policy
                        (Note 4).
                             Provisions (credits) for income taxes were:



                                                         2000                         1999                          1998
                                             --------------------------    -------------------------   -------------------------
                        (In millions)         Current  Deferred   Total     Current Deferred   Total    Current  Deferred  Total
                        --------------------------------------------------------------------------------------------------------
                                                                                                 
                        Federal               $ (357)  $  340   $  (17)    $  (84)  $   99   $   15     $   19   $  149    $ 168
                        State and local          (12)      49       37          1        8        9          3        9       12
                        Foreign                    -        -        -          1        -        1         (7)       -       (7)
                                              ------   ------   ------     ------   ------   ------     ------   ------    -----
                            Total             $ (369)  $  389   $   20     $  (82)  $  107   $   25     $   15   $  158    $ 173
                        --------------------------------------------------------------------------------------------------------

                             A reconciliation of federal statutory tax rate
                        (35%) to total provisions follows:



                        (In millions)                                                            2000         1999         1998
                        --------------------------------------------------------------------------------------------------------
                                                                                                              
                        Statutory rate applied to income before income taxes                 $       -    $      27    $     188
                        Excess percentage depletion                                                 (3)          (7)         (11)
                        Effects of foreign operations, including foreign tax credits                (5)          (2)         (11)
                        State and local income taxes after federal income tax effects               24            6            8
                        Credits other than foreign tax credits                                      (3)          (3)          (3)
                        Adjustments of prior years' federal income taxes                             5            -            -
                        Other                                                                        2            4            2
                                                                                             ---------    ---------    ---------
                              Total provisions                                               $      20    $      25    $     173
                        --------------------------------------------------------------------------------------------------------


                             Deferred tax assets and liabilities resulted from
                        the following:



                        (In millions)                                                 December 31             2000         1999
                        --------------------------------------------------------------------------------------------------------
                                                                                                                  
                        Deferred tax assets:
                         Minimum tax credit carryforwards                                                  $     39     $    131
                         State tax loss carryforwards (expiring in 2001 through 2020)                            55           65
                         Employee benefits                                                                      782          998
                         Receivables, payables and debt                                                          52           68
                         Expected federal benefit for deducting state deferred income taxes                      16            -
                         Contingency and other accruals                                                          71           52
                         Other                                                                                    2           11
                         Valuation allowances - state                                                           (34)         (41)
                                                                                                           --------     --------
                              Total deferred tax assets/(a)/                                                    983        1,284
                                                                                                           --------     --------
                        Deferred tax liabilities:
                         Property, plant and equipment                                                          248          274
                         Prepaid pensions                                                                     1,046          921
                         Inventory                                                                               15           16
                         Investments in subsidiaries and equity investees                                        82           96
                         Other                                                                                   61           44
                                                                                                          ---------    ---------
                              Total deferred tax liabilities                                                  1,452        1,351
                                                                                                          ---------    ---------
                               Net deferred tax liabilities                                               $     469    $      67
                        --------------------------------------------------------------------------------------------------------


                        /(a)/ USX expects to generate sufficient future taxable
                              income to realize the benefit of the U. S. Steel
                              Group's deferred tax assets.

                               The consolidated tax returns of USX for the years
                        1990 through 1997 are under various stages of audit and
                        administrative review by the IRS. USX believes it has
                        made adequate provision for income taxes and interest
                        which may become payable for years not yet settled.
                               Pretax income in 2000 included $8 million
                        attributable to foreign sources.

                                                                            S-15


                             Undistributed earnings of certain consolidated
                        foreign subsidiaries at December 31, 2000, amounted to
                        $18 million. No provision for deferred U.S. income taxes
                        has been made for these subsidiaries because the U. S.
                        Steel Group intends to permanently reinvest such
                        earnings in those foreign operations. If such earnings
                        were not permanently reinvested, a deferred tax
                        liability of $6 million would have been required.

--------------------------------------------------------------------------------
16. Investments and Long-Term Receivables



                        (In millions)                                                 December 31             2000         1999
                        --------------------------------------------------------------------------------------------------------
                                                                                                                 
                        Equity method investments                                                         $     325    $     397
                        Other investments                                                                        67           39
                        Receivables due after one year                                                            5           11
                        Income taxes receivable                                                                  97           97
                        Deposits of restricted cash                                                               3            2
                        Other                                                                                    39           26
                                                                                                          ---------    ---------
                              Total                                                                       $     536    $     572
                       ---------------------------------------------------------------------------------------------------------


                             Summarized financial information of investees
                        accounted for by the equity method of accounting
                        follows:



                        (In millions)                                                            2000         1999         1998
                        --------------------------------------------------------------------------------------------------------
                                                                                                              
                        Income data - year:
                         Revenues and other income                                           $   3,484    $   3,027    $   3,163
                         Operating income (loss)                                                   112          (57)         193
                         Net income (loss)                                                        (166)        (193)          97
                       ---------------------------------------------------------------------------------------------------------
                        Balance sheet data - December 31:
                         Current assets                                                      $     911    $     995
                         Noncurrent assets                                                       2,196        2,402
                         Current liabilities                                                     1,171        1,181
                         Noncurrent liabilities                                                  1,307        1,251
                       ---------------------------------------------------------------------------------------------------------


                             USX acquired a 25% interest in VSZ during 2000. VSZ
                        does not provide its shareholders with financial
                        statements prepared in accordance with generally
                        accepted accounting principles in the United States
                        (USGAAP). Although shares of VSZ are traded on the
                        Bratislava Stock Exchange, those securities do not have
                        a readily determinable fair value as defined under
                        USGAAP. Accordingly, USX accounts for its investment in
                        VSZ under the cost method of accounting.
                             In 1999, USX and Kobe Steel, Ltd. (Kobe Steel)
                        completed a transaction that combined the steelmaking
                        and bar producing assets of USS/Kobe Steel Company
                        (USS/Kobe) with companies controlled by Blackstone
                        Capital Partners II. The combined entity was named
                        Republic Technologies International, LLC and is a wholly
                        owned subsidiary of Republic Technologies International
                        Holdings, LLC (Republic). As a result of this
                        transaction, the U. S. Steel Group recorded $47 million
                        in charges related to the impairment of the carrying
                        value of its investment in USS/Kobe and costs related to
                        the formation of Republic. These charges were included
                        in income (loss) from investees in 1999. In addition,
                        USX made a $15 million equity investment in Republic.
                        USX owned 50% of USS/Kobe and now owns 16% of Republic.
                        USX accounts for its investment in Republic under the
                        equity method of accounting. The seamless pipe business
                        of USS/Kobe was excluded from this transaction. That
                        business, now known as Lorain Tubular Company, LLC,
                        became a wholly owned subsidiary of USX at the close of
                        business on December 31, 1999.
                             Dividends and partnership distributions received
                        from equity investees were $10 million in 2000, $2
                        million in 1999 and $19 million in 1998.
                             U. S. Steel Group purchases of transportation
                        services and semi-finished steel from equity investees
                        totaled $566 million, $361 million and $331 million in
                        2000, 1999 and 1998, respectively. At December 31, 2000
                        and 1999, U. S. Steel Group payables to these investees
                        totaled $66 million and $60 million, respectively. U. S.
                        Steel Group revenues for steel and raw material sales to
                        equity investees totaled $958 million, $831 million and
                        $725 million in 2000, 1999 and 1998, respectively. At
                        December 31, 2000 and 1999, U. S. Steel Group
                        receivables from these investees were $177 million.
                        Generally, these transactions were conducted under
                        long-term, market-based contractual arrangements.

S-16


-------------------------------------------------------------------------------
17. Leases

                        Future minimum commitments for capital leases (including
                        sale-leasebacks accounted for as financings) and for
                        operating leases having remaining noncancelable lease
                        terms in excess of one year are as follows:



                                                                                                           Capital       Operating
                        (In millions)                                                                      Leases         Leases
                       -----------------------------------------------------------------------------------------------------------
                                                                                                                   
                        2001                                                                              $      11      $    79
                        2002                                                                                     11           56
                        2003                                                                                     11           40
                        2004                                                                                     11           37
                        2005                                                                                     11           29
                        Later years                                                                              84           64
                        Sublease rentals                                                                          -          (62)
                                                                                                          ---------      -------
                               Total minimum lease payments                                                     139      $   243
                                                                                                                         =======
                        Less imputed interest costs                                                              51
                                                                                                          ---------
                               Present value of net minimum lease payments
                                 included in long-term debt                                               $      88
                       -----------------------------------------------------------------------------------------------------------


                             Operating lease rental expense:

                        (In millions)                                                            2000         1999         1998
                       -----------------------------------------------------------------------------------------------------------
                                                                                                               
                        Minimum rental                                                        $    132     $    124     $    131
                        Contingent rental                                                           17           18           19
                        Sublease rentals                                                            (6)          (6)          (7)
                                                                                              --------     --------     --------
                              Net rental expense                                              $    143     $    136     $    143
                       -----------------------------------------------------------------------------------------------------------


                             The U. S. Steel Group leases a wide variety of
                        facilities and equipment under operating leases,
                        including land and building space, office equipment,
                        production facilities and transportation equipment. Most
                        long-term leases include renewal options and, in certain
                        leases, purchase options.

--------------------------------------------------------------------------------
18. Trust Preferred Securities

                        In 1997, USX exchanged approximately 3.9 million 6.75%
                        Convertible Quarterly Income Preferred Securities (Trust
                        Preferred Securities) of USX Capital Trust I, a Delaware
                        statutory business trust (Trust), for an equivalent
                        number of shares of its 6.50% Cumulative Convertible
                        Preferred Stock (6.50% Preferred Stock) (Exchange). The
                        Exchange resulted in the recording of Trust Preferred
                        Securities at a fair value of $182 million.
                             USX owns all of the common securities of the Trust,
                        which was formed for the purpose of the Exchange. (The
                        Trust Common Securities and the Trust Preferred
                        Securities are together referred to as the Trust
                        Securities.) The Trust Securities represent undivided
                        beneficial ownership interests in the assets of the
                        Trust, which consist solely of USX 6.75% Convertible
                        Junior Subordinated Debentures maturing March 31, 2037
                        (Debentures), having an aggregate principal amount equal
                        to the aggregate initial liquidation amount ($50.00 per
                        security and $203 million in total) of the Trust
                        Securities issued by the Trust. Interest and principal
                        payments on the Debentures will be used to make
                        quarterly distributions and to pay redemption and
                        liquidation amounts on the Trust Preferred Securities.
                        The quarterly distributions, which accumulate at the
                        rate of 6.75% per annum on the Trust Preferred
                        Securities and the accretion from fair value to the
                        initial liquidation amount, are charged to income and
                        included in net interest and other financial costs.
                             Under the terms of the Debentures, USX has the
                        right to defer payment of interest for up to 20
                        consecutive quarters and, as a consequence, monthly
                        distributions on the Trust Preferred Securities will be
                        deferred during such period. If USX exercises this
                        right, then, subject to limited exceptions, it may not
                        pay any dividend or make any distribution with respect
                        to any shares of its capital stock.

                                                                            S-17


                             The Trust Preferred Securities are convertible at
                        any time prior to the close of business on March 31,
                        2037 (unless such right is terminated earlier under
                        certain circumstances) at the option of the holder, into
                        shares of Steel Stock at a conversion price of $46.25
                        per share of Steel Stock (equivalent to a conversion
                        ratio of 1.081 shares of Steel Stock for each Trust
                        Preferred Security), subject to adjustment in certain
                        circumstances.
                             The Trust Preferred Securities may be redeemed at
                        any time at the option of USX, at a premium of 101.95%
                        of the initial liquidation amount through March 31,
                        2001, and thereafter, declining annually to the initial
                        liquidation amount on April 1, 2003, and thereafter.
                        They are mandatorily redeemable at March 31, 2037, or
                        earlier under certain circumstances.
                             Payments related to quarterly distributions and to
                        the payment of redemption and liquidation amounts on the
                        Trust Preferred Securities by the Trust are guaranteed
                        by USX on a subordinated basis. In addition, USX
                        unconditionally guarantees the Trust's Debentures. The
                        obligations of USX under the Debentures, and the related
                        indenture, trust agreement and guarantee constitute a
                        full and unconditional guarantee by USX of the Trust's
                        obligations under the Trust Preferred Securities.

--------------------------------------------------------------------------------
19. Stockholders' Equity



                        (In millions, except per share data)                                     2000         1999         1998
                       -----------------------------------------------------------------------------------------------------------
                                                                                                              
                        Preferred stock:
                         Balance at beginning of year                                        $       3    $       3    $       3
                         Repurchased                                                                (1)           -            -
                                                                                             ---------    ---------    ---------
                         Balance at end of year                                              $       2    $       3    $       3
                       -----------------------------------------------------------------------------------------------------------
                        Common stockholders' equity:
                         Balance at beginning of year                                        $   2,053    $   2,090    $   1,779
                         Net income (loss)                                                         (21)          44          364
                         Repurchase of 6.50% preferred stock                                       (11)          (2)          (8)
                         Steel Stock issued                                                          6            2           59
                         Dividends on preferred stock                                               (8)          (9)          (9)
                         Dividends on Steel Stock (per share $1.00)                                (89)         (88)         (88)
                         Deferred compensation                                                      (3)           1            -
                         Accumulated other comprehensive income (loss)/(a)/:
                           Foreign currency translation adjustments                                (13)          (5)          (5)
                           Minimum pension liability adjustments (Note 12)                           3           20           (2)
                                                                                             ---------    ---------    ---------
                         Balance at end of year                                              $   1,917    $   2,053    $   2,090
                       -----------------------------------------------------------------------------------------------------------
                        Total stockholders' equity                                           $   1,919    $   2,056    $   2,093
                       -----------------------------------------------------------------------------------------------------------


                        /(a)/ See page U-7 of the USX consolidated financial
                              statements relative to the annual activity of
                              these adjustments. Total comprehensive income
                              (loss) for the U. S. Steel Group for the years
                              2000, 1999 and 1998 was $(31) million, $59 million
                              and $357 million, respectively.

--------------------------------------------------------------------------------
20. Dividends

                        In accordance with the USX Restated Certificate of
                        Incorporation, dividends on the Steel Stock and Marathon
                        Stock are limited to the legally available funds of USX.
                        Net losses of either Group, as well as dividends and
                        distributions on any class of USX Common Stock or series
                        of preferred stock and repurchases of any class of USX
                        Common Stock or series of preferred stock at prices in
                        excess of par or stated value, will reduce the funds of
                        USX legally available for payment of dividends on both
                        classes of Common Stock. Subject to this limitation, the
                        Board of Directors intends to declare and pay dividends
                        on the Steel Stock based on the financial condition and
                        results of operations of the U. S. Steel Group, although
                        it has no obligation under Delaware law to do so. In
                        making its dividend decisions with respect to Steel
                        Stock, the Board of Directors considers, among other
                        things, the long-term earnings and cash flow
                        capabilities of the U. S. Steel Group as well as the
                        dividend policies of similar publicly traded steel
                        companies.
                             Dividends on the Steel Stock are further limited to
                        the Available Steel Dividend Amount. At December 31,
                        2000, the Available Steel Dividend Amount was at least
                        $3,161 million. The Available Steel Dividend Amount will
                        be increased or decreased, as appropriate, to reflect U.
                        S. Steel Group net income, dividends, repurchases or
                        issuances with respect to the Steel Stock and preferred
                        stock attributed to the U. S. Steel Group and certain
                        other items.

S-18


--------------------------------------------------------------------------------
21. Income Per Common Share

                        The method of calculating net income (loss) per share
                        for the Steel Stock and the Marathon Stock reflects the
                        USX Board of Directors' intent that the separately
                        reported earnings and surplus of the U. S. Steel Group
                        and the Marathon Group, as determined consistent with
                        the USX Restated Certificate of Incorporation, are
                        available for payment of dividends to the respective
                        classes of stock, although legally available funds and
                        liquidation preferences of these classes of stock do not
                        necessarily correspond with these amounts.
                             Basic net income (loss) per share is calculated by
                        adjusting net income for dividend requirements of
                        preferred stock and is based on the weighted average
                        number of common shares outstanding.
                             Diluted net income (loss) per share assumes
                        conversion of convertible securities for the applicable
                        periods outstanding and assumes exercise of stock
                        options, provided in each case, the effect is not
                        antidilutive.



                                                                      2000                    1999                   1998
                                                                ------------------      -----------------      ------------------
                                                                Basic      Diluted      Basic     Diluted      Basic      Diluted
                                                                -----      -------      -----     -------      -----      -------
                                                                                                         
              Computation of Income Per Share
              -------------------------------
              Net income (loss) (millions):
               Income (loss) before extraordinary losses      $    (21)   $   (21)   $     51    $     51    $    364   $     364
               Dividends on preferred stock                          8          8           9           9           9           -
               Extraordinary losses                                  -          -           7           7           -           -
                                                              --------    -------    --------    --------    --------   ---------
               Net income (loss) applicable to Steel Stock         (29)       (29)         35          35         355         364
               Effect of dilutive securities -
                 Trust preferred securities                          -          -           -           -           -           8
                                                              --------    -------    --------    --------    --------   ---------
                    Net income (loss) assuming conversions    $    (29)   $   (29)   $     35    $     35    $    355   $     372
                                                              ========    =======    ========    ========    ========   =========
              Shares of common stock outstanding (thousands):
               Average number of common shares outstanding      88,613     88,613      88,392      88,392      87,508      87,508
               Effect of dilutive securities:
                 Trust preferred securities                          -          -           -           -           -       4,256
                 Preferred stock                                     -          -           -           -           -       3,143
                 Stock options                                       -          -           -           4           -          36
                                                              --------    -------    --------    --------    --------   ---------
                    Average common shares and dilutive effect   88,613     88,613      88,392      88,396      87,508      94,943
                                                              ========    =======    ========    ========    ========   =========
              Per share:
               Income (loss) before extraordinary losses      $   (.33)   $  (.33)   $    .48    $    .48    $   4.05   $    3.92
               Extraordinary losses                                  -          -         .08         .08           -           -
                                                              --------    -------    --------    --------    --------   ---------
               Net income (loss)                              $   (.33)   $  (.33)   $    .40    $    .40    $   4.05   $    3.92
                                                              ========    =======    ========    ========    ========   =========

--------------------------------------------------------------------------------
22. Stock-Based Compensation Plans and Stockholder Rights Plan

                        USX Stock-Based Compensation Plans and Stockholder
                        Rights Plan are discussed in Note 17, and Note 19,
                        respectively, to the USX consolidated financial
                        statements.
                             The U. S. Steel Group's actual stock-based
                        compensation expense was $1 million in 2000 and 1999,
                        and none in 1998. Incremental compensation expense, as
                        determined under a fair value model, was not material
                        ($.02 or less per share for all years presented).
                        Therefore, pro forma net income and earnings per share
                        data have been omitted.

--------------------------------------------------------------------------------
23. Property, Plant and Equipment



                        (In millions)                                                 December 31             2000         1999
                       -----------------------------------------------------------------------------------------------------------
                                                                                                              
                        Land and depletable property                                                      $     161    $     152
                        Buildings                                                                               602          484
                        Machinery and equipment                                                               8,409        8,007
                        Leased assets                                                                            98          105
                                                                                                          ---------    ---------
                              Total                                                                           9,270        8,748
                        Less accumulated depreciation, depletion and amortization                             6,531        6,232
                                                                                                          ---------    ---------
                              Net                                                                         $   2,739    $   2,516
                       -----------------------------------------------------------------------------------------------------------


                             Amounts in accumulated depreciation, depletion and
                        amortization for assets acquired under capital leases
                        (including sale-leasebacks accounted for as financings)
                        were $79 million and $81 million at December 31, 2000
                        and 1999, respectively.
                             During 2000, the U. S. Steel Group recorded $71
                        million of impairments relating to coal assets located
                        in West Virginia and Alabama. The impairment was
                        recorded as a result of a reassessment of long-term
                        prospects after adverse geological conditions were
                        encountered. The charge is included in depreciation,
                        depletion and amortization.

                                                                            S-19


--------------------------------------------------------------------------------
24. Derivative Instruments

                        The U. S. Steel Group remains at risk for possible
                        changes in the market value of derivative instruments;
                        however, such risk should be mitigated by price changes
                        in the underlying hedged item. The U. S. Steel Group is
                        also exposed to credit risk in the event of
                        nonperformance by counterparties. The credit-worthiness
                        of counterparties is subject to continuing review,
                        including the use of master netting agreements to the
                        extent practical, and full performance is anticipated.
                              The following table sets forth quantitative
                        information by class of derivative instrument:



                                                                                  Fair           Carrying     Recorded
                                                                                  Value           Amount      Deferred    Aggregate
                                                                                 Assets           Assets       Gain or    Contract
                        (In millions)                                       (Liabilities)/(a)/ (Liabilities)    (Loss)   Values/(b)/
                        ----------------------------------------------------------------------------------------------------------
                                                                                                             
                        December 31, 2000:
                         OTC commodity swaps - other than trading/(c)/            $    -          $    -       $    -       $   18
                        ----------------------------------------------------------------------------------------------------------
                        December 31, 1999:
                         OTC commodity swaps - other than trading                 $    3          $    3       $    3       $   37
                       -----------------------------------------------------------------------------------------------------------
                       /(a)/   The fair value amounts are based on exchange-
                               traded index prices and dealer quotes.
                       /(b)/   Contract or notional amounts do not quantify risk
                               exposure, but are used in the calculation of cash
                               settlements under the contracts.
                       /(c)/   The OTC swap arrangements vary in duration with
                               certain contracts extending into 2001.

--------------------------------------------------------------------------------
25. Fair Value of Financial Instruments

                        Fair value of the financial instruments disclosed herein
                        is not necessarily representative of the amount that
                        could be realized or settled, nor does the fair value
                        amount consider the tax consequences of realization or
                        settlement. The following table summarizes financial
                        instruments, excluding derivative financial instruments
                        disclosed in Note 24, by individual balance sheet
                        account. As described in Note 4, the U. S. Steel Group's
                        specifically attributed financial instruments and the U.
                        S. Steel Group's portion of USX's financial instruments
                        attributed to all groups are as follows:



                                                                                              2000                   1999
                                                                                        -----------------      -----------------
                                                                                        Fair     Carrying      Fair     Carrying
                        (In millions)                    December 31                    Value     Amount       Value     Amount
                       ---------------------------------------------------------------------------------------------------------
                                                                                                            
                        Financial assets:
                         Cash and cash equivalents                                   $    219    $    219    $     22   $     22
                         Receivables (including intergroup receivables)                 1,341       1,341         935        935
                         Investments and long-term receivables                            137         137         122        122
                                                                                     --------    --------    --------   --------
                               Total financial assets                                $  1,697    $  1,697    $  1,079   $  1,079
                       ---------------------------------------------------------------------------------------------------------
                        Financial liabilities:
                         Notes payable                                               $     70    $     70    $      -   $      -
                         Accounts payable                                                 760         760         739        739
                         Accrued interest                                                  47          47          15         15
                         Long-term debt (including amounts due within one year)         2,375       2,287         835        823
                         Preferred stock of subsidiary and trust
                           preferred securities                                           182         249         232        249
                                                                                     --------    --------    --------   --------
                               Total financial liabilities                           $  3,434    $  3,413    $  1,821   $  1,826
                       ---------------------------------------------------------------------------------------------------------


                        Fair value of financial instruments classified as
                        current assets or liabilities approximates carrying
                        value due to the short-term maturity of the instruments.
                        Fair value of investments and long-term receivables was
                        based on discounted cash flows or other specific
                        instrument analysis. Certain foreign cost method
                        investments are excluded from investments and long-term
                        receivables because the fair value is not readily
                        determinable. The U. S. Steel Group is subject to market
                        risk and liquidity risk related to its investments;
                        however, these risks are not readily quantifiable. Fair
                        value of preferred stock of subsidiary and trust
                        preferred securities was based on market prices. Fair
                        value of long-term debt instruments was based on market
                        prices where available or current borrowing rates
                        available for financings with similar terms and
                        maturities.
                              Financial guarantees are the U. S. Steel Group's
                        only unrecognized financial instrument. It is not
                        practicable to estimate the fair value of this form of
                        financial instrument obligation because there are no
                        quoted market prices for transactions which are similar
                        in nature. For details relating to financial guarantees,
                        see Note 26.

--------------------------------------------------------------------------------

S-20


--------------------------------------------------------------------------------
26. Contingencies and Commitments

                        USX is the subject of, or party to, a number of pending
                        or threatened legal actions, contingencies and
                        commitments relating to the U. S. Steel Group involving
                        a variety of matters, including laws and regulations
                        relating to the environment. Certain of these matters
                        are discussed below. The ultimate resolution of these
                        contingencies could, individually or in the aggregate,
                        be material to the U. S. Steel Group financial
                        statements. However, management believes that USX will
                        remain a viable and competitive enterprise even though
                        it is possible that these contingencies could be
                        resolved unfavorably to the U. S. Steel Group.

                        Environmental matters -
                             The U. S. Steel Group is subject to federal, state,
                        local and foreign laws and regulations relating to the
                        environment. These laws generally provide for control of
                        pollutants released into the environment and require
                        responsible parties to undertake remediation of
                        hazardous waste disposal sites. Penalties may be imposed
                        for noncompliance. Accrued liabilities for remediation
                        totaled $137 million and $101 million at December 31,
                        2000 and 1999, respectively. It is not presently
                        possible to estimate the ultimate amount of all
                        remediation costs that might be incurred or the
                        penalties that may be imposed.
                             For a number of years, the U. S. Steel Group has
                        made substantial capital expenditures to bring existing
                        facilities into compliance with various laws relating to
                        the environment. In 2000 and 1999, such capital
                        expenditures totaled $18 million and $32 million,
                        respectively. The U. S. Steel Group anticipates making
                        additional such expenditures in the future; however, the
                        exact amounts and timing of such expenditures are
                        uncertain because of the continuing evolution of
                        specific regulatory requirements.

                        Guarantees -
                             Guarantees by USX of the liabilities of
                        unconsolidated entities of the U. S. Steel Group totaled
                        $82 million at December 31, 2000, and $88 million at
                        December 31, 1999. In the event that any defaults of
                        guaranteed liabilities occur, USX has access to its
                        interest in the assets of the investees to reduce
                        potential U. S. Steel Group losses resulting from these
                        guarantees. As of December 31, 2000, the largest
                        guarantee for a single such entity was $59 million.

                        Commitments -
                             At December 31, 2000 and 1999, the U. S. Steel
                        Group's contract commitments to acquire property, plant
                        and equipment totaled $206 million and $83 million,
                        respectively.
                             USSK has a commitment to the Slovak government for
                        a capital improvements program of $700 million, subject
                        to certain conditions, over a period commencing with the
                        acquisition date and ending on December 31, 2010. USSK
                        is required to report periodically to the Slovak
                        government on its status toward meeting this commitment.
                        The first reporting period ends on December 31, 2003.
                             USX entered into a 15-year take-or-pay arrangement
                        in 1993, which requires the U. S. Steel Group to accept
                        pulverized coal each month or pay a minimum monthly
                        charge of approximately $1 million. Charges for
                        deliveries of pulverized coal totaled $23 million in
                        2000, 1999 and 1998. If USX elects to terminate the
                        contract early, a maximum termination payment of $96
                        million, which declines over the duration of the
                        agreement, may be required.

                                                                            S-21


Selected Quarterly Financial Data (Unaudited)



                                                     2000                                           1999
                              ------------------------------------------------  --------------------------------------------
(In millions, except per
     share data)              4th Qtr.       3rd Qtr.     2nd Qtr.    1st Qtr.   4th Qtr.   3rd Qtr.     2nd Qtr.   1st Qtr.
----------------------------------------------------------------------------------------------------------------------------
                                                                                            
Revenues and other income:
  Revenues/(a)/               $ 1,417        $1,462        $1,629      $1,582     $1,492     $1,415        $1,344      $1,285
  Other income (loss)             (4)            13            27           6          8        (40)            1         (35)
                              ------         ------        ------      ------     ------     ------        ------      ------
      Total                    1,413          1,475         1,656       1,588      1,500      1,375         1,345       1,250
Income (loss)
  from operations               (159)            60           112          91         75        (26)          103          (2)
Income (loss) before
  extraordinary losses          (139)            19            56          43         34        (29)           55          (9)
Net income (loss)               (139)            19            56          43         34        (31)           55         (14)
------------------------------------------------------------------------------------------------------------------------------
Steel Stock data:
-----------------
Income (loss) before
  extraordinary losses
  applicable to Steel Stock   $ (141)        $    17       $   54      $   41     $   32     $  (31)       $   52      $  (11)
  - Per share: basic           (1.59)            .19          .62         .45        .35       (.35)          .60        (.13)
               diluted         (1.59)            .19          .62         .45        .35       (.35)          .59        (.13)
Dividends paid per share         .25             .25          .25         .25        .25        .25           .25         .25
Price range of Steel
 Stock/(b)/:
  - Low                           12-11/16        14-7/8       18-1/4      20-5/8     21-3/4     24-9/16       23-1/2       22-1/4
  - High                          18-5/16         19-11/16     26-7/8      32-15/16   33         30-1/16       34-1/4       29-1/8
------------------------------------------------------------------------------------------------------------------------------


/(a)/  Certain items have been reclassified between revenues and cost of
       revenues, primarily to give effect to new accounting standards as
       disclosed in Note 3 of the Notes to Financial Statements. Amounts
       reclassified in the first, second and third quarters of 2000 were $41
       million, $45 million and $45 million, respectively, and for the first,
       second, third and fourth quarters of 1999 were $39 million, $41 million,
       $38 million and $38 million, respectively.
/(b)/  Composite tape.





Principal Unconsolidated Investees (Unaudited)



                                                                          December 31, 2000
               Company                                  Country               Ownership                   Activity
------------------------------------------------------------------------------------------------------------------------------------
                                                                                            
Clairton 1314B Partnership, L.P.                     United States               10%                 Coke & Coke By-Products
Double Eagle Steel Coating Company                   United States               50%                 Steel Processing
PRO-TEC Coating Company                              United States               50%                 Steel Processing
Republic Technologies International, LLC             United States               16%                 Steel Products
Transtar, Inc.                                       United States               46%                 Transportation
USS-POSCO Industries                                 United States               50%                 Steel Processing
Worthington Specialty Processing                     United States               50%                 Steel Processing
------------------------------------------------------------------------------------------------------------------------------------





Supplementary Information on Mineral Reserves Other Than Oil and Gas
(Unaudited)

See the USX consolidated financial statements for Supplementary Information on
Mineral Reserves Other Than Oil and Gas relating to the U. S. Steel Group, pages
U-31 through U-33.

S-22


                        Five-Year Operating Summary



                        (Thousands of net tons, unless otherwise noted)       2000        1999       1998        1997       1996
                        ---------------------------------------------------------------------------------------------------------
                                                                                                            
                        Raw Steel Production
                         Gary, IN                                             6,610       7,102     6,468       7,428       6,840
                         Mon Valley, PA                                       2,683       2,821     2,594       2,561       2,746
                         Fairfield, AL                                        2,069       2,109     2,152       2,361       1,862
                         Kosice, Slovak Republic                                382          -          -           -           -
                                                                             ----------------------------------------------------
                               Total                                         11,744      12,032    11,214      12,350      11,448
                        ---------------------------------------------------------------------------------------------------------
                        Raw Steel Capability
                         Domestic Steel                                      12,800      12,800    12,800      12,800      12,800
                         U. S. Steel Kosice/(a)/                                467           -         -           -           -
                                                                             ----------------------------------------------------
                               Total                                         13,267      12,800    12,800      12,800      12,800
                               Total production as % of total capability       88.5        94.0      87.6        96.5        89.4
                        ---------------------------------------------------------------------------------------------------------
                        Hot Metal Production
                         Domestic Steel                                       9,904      10,344     9,743      10,591       9,716
                         U. S. Steel Kosice                                     340           -         -           -           -
                                                                             ----------------------------------------------------
                               Total                                         10,244      10,344     9,743      10,591       9,716
                        ---------------------------------------------------------------------------------------------------------
                        Coke Production
                         Domestic Steel/(b)/                                  5,003       4,619     4,835       5,757       6,777
                         U. S. Steel Kosice                                     188           -         -           -           -
                                                                             ----------------------------------------------------
                               Total                                          5,191       4,619     4,835       5,757       6,777
                        ---------------------------------------------------------------------------------------------------------
                        Iron Ore Pellets - Minntac, MN
                         Shipments                                           15,020      15,025    15,446      16,403      14,962
                        ---------------------------------------------------------------------------------------------------------
                        Coal Shipments                                        6,779       6,924     7,670       7,811       7,117
                        ---------------------------------------------------------------------------------------------------------
                        Steel Shipments by Product - Domestic Steel
                         Sheet and semi-finished steel products               7,409       8,114     7,608       8,170       8,677
                         Tubular, plate and tin mill products                 3,347       2,515     3,078       3,473       2,695
                                                                             ----------------------------------------------------
                               Total                                         10,756      10,629    10,686      11,643      11,372
                               Total as % of domestic steel industry            9.8        10.0      10.5        10.9        11.3
                        ---------------------------------------------------------------------------------------------------------
                        Steel Shipments by Product - U. S. Steel Kosice
                         Sheet and semi-finished steel products                 207           -         -           -           -
                         Tubular, plate and tin mill products                   110           -         -           -           -
                                                                             ----------------------------------------------------
                               Total                                            317           -         -           -           -
                        ---------------------------------------------------------------------------------------------------------
                        Steel Shipments by Market - Domestic Steel
                         Steel service centers                                2,315       2,456     2,563       2,746       2,831
                         Transportation                                       1,466       1,505     1,785       1,758       1,721
                         Further conversion:
                           Joint ventures                                     1,771       1,818     1,473       1,568       1,542
                           Trade customers                                    1,174       1,633     1,140       1,378       1,227
                         Containers                                             702         738       794         856         874
                         Construction                                           936         844       987         994         865
                         Oil, gas and petrochemicals                            973         363       509         810         746
                         Export                                                 544         321       382         453         493
                         All other                                              875         951     1,053       1,080       1,073
                                                                             ----------------------------------------------------
                               Total                                         10,756      10,629    10,686      11,643      11,372
                        ---------------------------------------------------------------------------------------------------------
                        Average Steel Price Per Ton
                         Domestic Steel                                        $450        $420      $469        $479        $467
                         U. S. Steel Kosice                                     269           -         -           -           -
                        ---------------------------------------------------------------------------------------------------------

                        /(a)/  Represents the operations of U. S. Steel Kosice
                               s.r.o., following the acquisition of the
                               steelmaking operations and related assets of VSZ
                               a.s. on November 24, 2000.
                        /(b)/  The reduction in coke production after 1996
                               reflected U. S. Steel's entry into a strategic
                               partnership with two limited partners on June 1,
                               1997, to acquire an interest in three coke
                               batteries at its Clairton (Pa.) Works.

                                                                            S-23


                        Five-Year Financial Summary



                        (Dollars in millions, except as noted)       2000         1999          1998         1997         1996
                        ---------------------------------------------------------------------------------------------------------
                                                                                                          
                        Revenues and Other Income
                         Revenues by product:
                           Sheet and semi-finished
                             steel products                         $  3,288      $ 3,433      $ 3,598      $  3,923     $  3,774
                           Tubular, plate and tin mill products        1,731        1,140        1,546         1,793        1,671
                           Raw materials (coal, coke and iron ore)       626          549          744           796          824
                           Other/(a)/                                    445          414          490           517          466
                         Income (loss) from investees                     (8)         (89)          46            69           66
                         Net gains on disposal of assets                  46           21           54            57           16
                         Other income (loss)                               4            2           (1)            1           55
                                                                    -------------------------------------------------------------
                               Total revenues and other income/(b)/ $  6,132      $ 5,470      $ 6,477      $  7,156     $  6,872
                        ---------------------------------------------------------------------------------------------------------
                        Income From Operations
                         Segment income:
                           Domestic Steel/(b)/                      $     23      $    91      $   517      $    787     $    420
                           U. S. Steel Kosice                              2            -            -             -            -
                         Items not allocated to segments:
                           Net pension credits/(b)/                      266          228          186           144          158
                           Costs of former businesses                    (91)         (83)        (100)         (125)        (120)
                           Administrative expenses                       (25)         (17)         (24)          (33)         (28)
                           Other/(c)/                                    (71)         (69)           -             -           53
                                                                    -------------------------------------------------------------
                               Total income from operations              104          150          579           773          483
                         Net interest and other financial costs          105           74           42            87          116
                         Provision for income taxes                       20           25          173           234           92
                        ---------------------------------------------------------------------------------------------------------
                        Income (Loss) Before
                         Extraordinary Losses                       $    (21)     $    51      $   364      $    452     $    275
                         Per common share    - basic (in dollars)       (.33)         .48         4.05          5.24         3.00
                                             - diluted (in dollars)     (.33)         .48         3.92          4.88         2.95
                        Net Income (Loss)                           $    (21)     $    44      $   364      $    452     $    273
                         Per common share    - basic (in dollars)       (.33)         .40         4.05          5.24         2.98
                                             - diluted (in dollars)     (.33)         .40         3.92          4.88         2.95
                        ---------------------------------------------------------------------------------------------------------
                        Balance Sheet Position at year-end
                         Current assets                             $  2,717      $ 1,981      $ 1,275      $  1,531     $  1,428
                         Net property, plant and equipment             2,739        2,516        2,500         2,496        2,551
                         Total assets                                  8,711        7,525        6,749         6,694        6,580
                         Short-term debt                                 209           13           25            67           91
                         Other current liabilities                     1,182        1,271          991         1,267        1,208
                         Long-term debt                                2,236          902          464           456        1,014
                         Employee benefits                             1,767        2,245        2,315         2,338        2,430
                         Trust preferred securities and
                           preferred stock of subsidiary                 249          249          248           248           64
                         Common stockholders' equity                   1,917        2,053        2,090         1,779        1,559
                           Per share (in dollars)                      21.58        23.23        23.66         20.56        18.37
                        ---------------------------------------------------------------------------------------------------------
                        Cash Flow Data
                         Net cash from operating activities         $   (627)         (80)     $   380      $    476     $     92
                         Capital expenditures                            244          287          310           261          337
                         Disposal of assets                               21           10           21           420          161
                         Dividends paid                                   97           97           96            96          104
                        ---------------------------------------------------------------------------------------------------------
                        Employee Data
                         Total employment costs                     $  1,197/(d)/   1,148      $ 1,305      $  1,417     $  1,372
                         Average domestic employment cost
                           (dollars per hour)                          28.70        28.35        30.42         31.56        30.35
                         Average number of domestic employees         19,353       19,266       20,267        20,683       20,831
                         Number of U. S. Steel Kosice s.r.o.
                           employees at year-end                      16,244            -            -             -            -
                         Number of pensioners at year-end             94,339       97,102/(e)/  92,051        93,952       96,510
                        ---------------------------------------------------------------------------------------------------------
                        Stockholder Data at year-end
                         Number of common shares
                           outstanding (in millions)                    88.8         88.4         88.3          86.6         84.9
                         Registered shareholders (in thousands)         50.3         55.6         60.2          65.1         71.0
                         Market price of common stock               $ 18.000      $33.000      $23.000      $ 31.250     $ 31.375
                        ---------------------------------------------------------------------------------------------------------


                        /(a)/ Includes revenue from the sale of steel production
                              by-products, engineering and consulting services,
                              real estate development and resource management.
                        /(b)/ 1996-1999 reclassified to conform to 2000
                              classifications.
                        /(c)/ Includes impairment of coal assets in 2000, losses
                              related to investments in equity investees in 1999
                              and gain on investee stock offering in 1996.
                        /(d)/ Includes U. S. Steel Kosice s.r.o. from date of
                              acquisition.
                        /(e)/ Includes approximately 8,000 surviving spouse
                              beneficiaries added to the U. S. Steel pension
                              plan in 1999.

S-24


                        Management's Discussion and Analysis

                            The U. S. Steel Group, through its Domestic Steel
                        segment, is engaged in the production and sale of steel
                        mill products, coke, and taconite pellets; the
                        management of mineral resources; coal mining; real
                        estate development; and engineering and consulting
                        services and, through its U. S. Steel Kosice ("USSK")
                        segment, primarily located in the Slovak Republic, in
                        the production and sale of steel mill products and coke
                        for the central European market. Certain business
                        activities are conducted through joint ventures and
                        partially owned companies, such as USS-POSCO Industries
                        ("USS-POSCO"), PRO-TEC Coating Company ("PRO-TEC"),
                        Transtar, Inc. ("Transtar"), Clairton 1314B Partnership,
                        Republic Technologies International, LLC ("Republic")
                        and Rannila Kosice s.r.o. Management's Discussion and
                        Analysis should be read in conjunction with the U. S.
                        Steel Group's Financial Statements and Notes to
                        Financial Statements.

                            Certain sections of Management's Discussion and
                        Analysis include forward-looking statements concerning
                        trends or events potentially affecting the businesses of
                        the U. S. Steel Group. These statements typically
                        contain words such as "anticipates," "believes,"
                        "estimates," "expects" or similar words indicating that
                        future outcomes are not known with certainty and subject
                        to risk factors that could cause these outcomes to
                        differ significantly from those projected. In accordance
                        with "safe harbor" provisions of the Private Securities
                        Litigation Reform Act of 1995, these statements are
                        accompanied by cautionary language identifying important
                        factors, though not necessarily all such factors, that
                        could cause future outcomes to differ materially from
                        those set forth in forward-looking statements. For
                        additional risk factors affecting the businesses of the
                        U. S. Steel Group, see Supplementary Data - Disclosures
                        About Forward-Looking Information in USX Form 10-K.

Management's Discussion and Analysis of Income

                            Revenues and Other Income for each of the last three
                        years are summarized in the following table:



                        (Dollars in millions)                                                    2000         1999         1998
                        ---------------------------------------------------------------------------------------------------------
                                                                                                               
                        Revenues by product:
                         Sheet and semi-finished steel products                               $  3,288     $  3,433     $  3,598
                         Tubular, plate, and tin mill products                                   1,731        1,140        1,546
                         Raw materials (coal, coke and iron ore)                                   626          549          744
                         Other/(a)/                                                                445          414          490
                        Income (loss) from investees                                                (8)         (89)          46
                        Net gains on disposal of assets                                             46           21           54
                        Other income (loss)                                                          4            2           (1)
                                                                                              ---------    ---------    ---------
                           Total revenues and other income                                    $  6,132     $  5,470     $  6,477
                        ---------------------------------------------------------------------------------------------------------


                        /(a)/ Includes revenue from the sale of steel production
                              by-products, real estate development, resource
                              management, and engineering and consulting
                              services.

                            Total revenues and other income increased by $662
                        million in 2000 from 1999 primarily due to the
                        consolidation of Lorain Tubular Company, LLC, ("Lorain
                        Tubular") effective January 1, 2000, higher average
                        realized prices, particularly tubular product prices,
                        and lower losses from investees, which, in 1999,
                        included a $47 million charge for the impairment of
                        U. S. Steel's previous investment in USS/Kobe Steel
                        Company and costs related to the formation of Republic.
                        Total revenues and other income in 1999 decreased by
                        $1,007 million from 1998 primarily due to lower average
                        realized prices and lower income from investees.

                                                                            S-25


                        Management's Discussion and Analysis  continued

                            Income from operations for the U. S. Steel Group for
                        the last three years was:



                        (Dollars in millions)                                                    2000         1999         1998
                        ---------------------------------------------------------------------------------------------------------
                                                                                                               
                        Segment income for Domestic Steel/(a)/                                $     23     $     91     $    517
                        Segment income for U. S. Steel Kosice/(b)/                                   2            -            -
                                                                                              ---------    ---------    ---------
                              Income for reportable segments                                  $     25     $     91     $    517
                        Items not allocated to segments:
                         Net pension credits                                                       266          228          186
                         Administrative expenses                                                   (25)         (17)         (24)
                         Costs related to former business activities/(c)/                          (91)         (83)        (100)
                         Asset impairments  - Coal                                                 (71)           -            -
                         Impairment of USX's investment in USS/Kobe and costs
                           related to formation of Republic                                          -          (47)           -
                         Loss on investment in RTI stock used to satisfy indexed
                           debt obligations/(d)/                                                     -          (22)           -
                                                                                              ---------    ---------    ---------
                              Total income from operations                                    $    104     $    150     $    579
                        ---------------------------------------------------------------------------------------------------------


                        /(a)/ Includes income from the sale and domestic
                              production of steel mill products, coke and
                              taconite pellets; the management of mineral
                              resources; coal mining; real estate development
                              and management; and engineering and consulting
                              services.
                        /(b)/ Includes the sale and production of steel products
                              from facilities primarily located in the Slovak
                              Republic commencing November 24, 2000. For further
                              details, see Note 5 to the U. S. Steel Group
                              Financial Statements.
                        /(c)/ Primarily represents postretirement costs other
                              than pension (OPEB costs) related to all retirees
                              prior to January 1, 1987, and related to former
                              employees and retirees from the businesses sold or
                              closed after January 1, 1987. Also includes
                              certain other expenses (primarily litigation and
                              environmental remediation costs) associated to
                              lines of business in which USX is no longer
                              engaged as a result of sale or closure.
                        /(d)/ For further details, see Note 6 to the U. S. Steel
                              Group Financial Statements.

                        Segment income for Domestic Steel

                            Domestic Steel operations recorded segment income of
                        $23 million in 2000 versus segment income of $91 million
                        in 1999, a decrease of $68 million. The 2000 segment
                        income included $36 million for certain environmental
                        and legal accruals, a $34 million charge to establish
                        reserves against notes and receivables from financially
                        distressed steel companies and a $10 million charge for
                        USX's share of Republic special charges. Results in 1999
                        included $17 million in charges for certain
                        environmental and legal accruals and $7 million in
                        various non-recurring investee charges. Excluding these
                        items, the decrease in segment income for Domestic Steel
                        was primarily due to higher costs related to energy and
                        inefficient operating levels due to lower throughput,
                        lower income from raw materials operations, particularly
                        coal operations and lower sheet shipments resulting from
                        high levels of imports that continued in 2000.

                            Segment income for Domestic Steel operations in 1999
                        decreased $426 million from 1998. Results in 1998
                        included a net favorable $30 million for an insurance
                        litigation settlement and charges of $10 million related
                        to a voluntary workforce reduction plan. Excluding these
                        items, the decrease in segment income for Domestic Steel
                        was primarily due to lower average steel prices, lower
                        income from raw materials operations, a less favorable
                        product mix and lower income from investees.

                        Segment income for U. S. Steel Kosice

                            USSK segment income for the period following the
                        November 24, 2000 acquisition through year-end 2000 was
                        $2 million.

S-26


                        Management's Discussion and Analysis  continued

                        Items not allocated to segments

                            Net pension credits, which are primarily noncash,
                        totaled $266 million in 2000, $228 million in 1999 and
                        $186 million in 1998. Net pension credits in 1999
                        included $35 million for a one-time favorable pension
                        settlement primarily related to the voluntary early
                        retirement program for salaried employees. For
                        additional information on pensions, see Note 12 to the
                        U. S. Steel Group Financial Statements.

                            Asset impairments - Coal, were for asset impairments
                        at U. S. Steel Mining's coal mines in Alabama and West
                        Virginia in 2000 following a reassessment of long-term
                        prospects after adverse geological conditions were
                        encountered.

                            Administrative expenses are corporate general and
                        administrative costs allocated to the U. S. Steel Group
                        by USX based upon utilization or other methods
                        management believes to be reasonable and which consider
                        certain measures of business activities, such as
                        employment, investments and revenues. The costs
                        allocated to the U. S. Steel Group were $25 million in
                        2000, $17 million in 1999 and $24 million in 1998, which
                        primarily consist of employment costs including pension
                        effects, professional services, facilities and other
                        related costs associated with corporate activities. The
                        increase from 1999 to 2000 primarily resulted from the
                        nonrecurrence of favorable 1999 franchise tax
                        settlements and employee compensation costs. The
                        decrease from 1998 to 1999 was largely the result of
                        lower franchise taxes, primarily due to settlements of
                        prior years' taxes.

                            Cost related to former business activities increased
                        $8 million in 2000 from 1999 primarily due to higher
                        litigation expenses. Costs related to former business
                        activities decreased $17 million in 1999 from 1998
                        primarily due to lower litigation expenses and lower
                        payments to a multiemployer health care benefit plan
                        created by the Coal Industry Retiree Health Benefit Act
                        of 1992.

                            In 1999, an impairment of USX's investment in
                        USS/Kobe and costs related to the formation of Republic
                        totaled $47 million.

                            Income from operations in 1999 also included a loss
                        on investment in RTI stock used to satisfy indexed debt
                        obligations of $22 million from the termination of
                        ownership in RTI International Metals, Inc. For further
                        discussion, see Note 6 to the U. S. Steel Group
                        Financial Statements.

                            Net interest and other financial costs for each of
                        the last three years are summarized in the following
                        table:



                        (Dollars in millions)                                                   2000         1999         1998
                        ---------------------------------------------------------------------------------------------------------
                                                                                                               
                        Net interest and other financial costs                                $    105     $     74     $     42
                        Less:
                         Favorable adjustment to
                           carrying value of Indexed Debt/(a)/                                       -           13           44
                                                                                              ---------    ---------    ---------
                        Net interest and other financial costs
                           adjusted to exclude above item                                     $    105     $     87     $     86
                        ---------------------------------------------------------------------------------------------------------


                        /(a)/ In December 1996, USX issued $117 million of 6-
                              3/4% Exchangeable Notes Due February 1, 2000
                              ("Indexed Debt") indexed to the price of RTI
                              common stock. The carrying value of Indexed Debt
                              was adjusted quarterly to settlement value, based
                              on changes in the value of RTI common stock. Any
                              resulting adjustment was credited to income and
                              included in interest and other financial costs.
                              For further discussion of Indexed Debt, see Note 6
                              to the U. S. Steel Group Financial Statements.

                            Adjusted net interest and other financial costs
                        increased $18 million in 2000 as compared with 1999,
                        primarily due to higher average debt levels. Adjusted
                        net interest and other financial costs were $87 million
                        in 1999 as compared with $86 million in 1998.

                                                                            S-27


                        Management's Discussion and Analysis  continued

                            The provision for income taxes in 2000 decreased
                        compared to 1999 primarily due to a decline in income
                        from operations, offset by higher state income taxes as
                        certain previously recorded state tax benefits will not
                        be utilized. The provision for income taxes in 1999
                        decreased compared to 1998 due to a decline in income
                        from operations. For further discussion on income taxes,
                        see Note 15 to the U. S. Steel Group Financial
                        Statements.

                            The extraordinary loss on extinguishment of debt of
                        $7 million, net of income tax benefit, in 1999 included
                        a $5 million loss resulting from the satisfaction of the
                        indexed debt and a $2 million loss for U. S. Steel's
                        share of Republic's extraordinary loss related to the
                        early extinguishment of debt. For additional
                        information, see Note 6 to the U. S. Steel Group
                        Financial Statements.

                            The U. S. Steel Group recorded a 2000 net loss of
                        $21 million, compared with net income of $44 million in
                        1999 and $364 million in 1998. Net income decreased $65
                        million in 2000 from 1999, and decreased $320 million in
                        1999 from 1998. The decreases in net income primarily
                        reflect the factors discussed above.

Management's Discussion and Analysis of Financial Condition, Cash Flows and
Liquidity

                            Current assets at year-end 2000 increased $736
                        million from year-end 1999 primarily due to an increase
                        in cash and cash equivalents, a larger inter-group
                        income tax receivable, and increased trade receivables
                        and inventories resulting from the acquisition of USSK.

                            Net property, plant and equipment at year-end 2000
                        increased $223 million from year-end 1999 primarily due
                        to the acquisition of USSK.

                            Current liabilities in 2000 increased $107 million
                        from 1999 primarily due to increased notes payable and
                        increased debt due within one year, partially offset by
                        a decrease in payroll and benefits payable.

                            Total long-term debt and notes payable at December
                        31, 2000 of $2,445 million was $1,530 million higher
                        than year-end 1999. USX debt attributed to the U. S.
                        Steel Group increased partially due to a $500 million
                        elective contribution to a Voluntary Employee Benefit
                        Association ("VEBA"), a trust established by contract in
                        1994 covering United Steelworkers of America retirees'
                        health care and life insurance benefits, and the
                        acquisition of USSK. Excluding the impact of these
                        items, the increase in debt was primarily due to lower
                        cash flow provided from operating activities partially
                        offset by reduced capital expenditures. For further
                        discussion of the VEBA contribution, see Note 12 to the
                        U. S. Steel Group Financial Statements. Most of the debt
                        is a direct obligation of, or is guaranteed by, USX.

                            Employee benefits at December 31, 2000 decreased
                        $478 million primarily due to the $500 million elective
                        contribution to a VEBA.

                            Net cash used in operating activities in 2000 was
                        $627 million and reflected the $500 million elective
                        contribution to a VEBA and a $30 million elective
                        contribution to a non-union retiree life insurance
                        trust, partially offset by an income tax settlement with
                        the Marathon Group in accordance with the group tax
                        allocation policy. Net cash used in operating activities
                        was $80 million in 1999 including a net payment of $320
                        million upon the expiration of the accounts receivable
                        program. Excluding these non-recurring items in both
                        years, net cash provided from operating activities
                        decreased $434 million in 2000 due mainly to decreased
                        profitability and an increase in working capital.

S-28


                        Management's Discussion and Analysis  continued

                            Net cash provided from operating activities was $380
                        million in 1998 and included proceeds of $38 million for
                        the insurance litigation settlement pertaining to the
                        1995 Gary Works No. 8 blast furnace explosion and the
                        payment of $30 million for the repurchase of sold
                        accounts receivable, partially offset by an income tax
                        settlement with the Marathon Group in accordance with
                        the group tax allocation policy. Excluding these
                        non-recurring items in both years, net cash provided
                        from operating activities decreased $110 million in 1999
                        due mainly to decreased profitability.

                            Capital expenditures of $244 million in 2000
                        included exercising an early buyout option of a lease
                        for approximately half of the Gary Works No. 2 Slab
                        Caster; the continued replacement of coke battery
                        thruwalls at Gary Works; installation of the remaining
                        two coilers at Gary's hot strip mill; a blast furnace
                        stove replacement at Gary Works; and the continuation of
                        an upgrade to the Mon Valley cold reduction mill.
                        Capital expenditures of $287 million in 1999 included
                        the completion of the new 64" pickle line at Mon Valley
                        Works; the replacement of one coiler at the Gary hot
                        strip mill; an upgrade to the Mon Valley cold reduction
                        mill; replacement of coke battery thruwalls at Gary
                        Works; several projects at Gary Works allowing for
                        production of specialized high strength steels,
                        primarily for the automotive market; and completion of
                        the conversion of the Fairfield pipemill to use rounds
                        instead of square blooms. Capital expenditures of $310
                        million in 1998 included a reline of the Gary Works No.
                        6 blast furnace; an upgrade to the galvanizing line at
                        Fairless Works; replacement of coke battery thruwalls at
                        Gary Works; conversion of the Fairfield pipemill to use
                        round instead of square blooms; and additional
                        environmental expenditures primarily at Fairfield Works
                        and Gary Works. Contract commitments for capital
                        expenditures at year-end 2000 were $206 million,
                        compared with $83 million at year-end 1999.

                            Capital expenditures for 2001 are expected to be
                        approximately $425 million including exercising an early
                        buyout option of a lease for the balance of the Gary
                        Works No. 2 Slab Caster; work on the No. 3 blast furnace
                        at Mon Valley Works; work on the No. 2 stove at the No.
                        6 blast furnace at Gary Works; the completion of the
                        replacement of coke battery thruwalls at Gary Works; the
                        completion of an upgrade to the Mon Valley cold
                        reduction mill; mobile equipment purchases; systems
                        development project; and projects at USSK, including the
                        completion of the tin mill upgrade.

                            The preceding statement concerning expected 2001
                        capital expenditures is a forward-looking statement.
                        This forward-looking statement is based on assumptions,
                        which can be affected by (among other things) levels of
                        cash flow from operations, general economic conditions,
                        whether or not assets are purchased or financed by
                        operating leases, unforeseen hazards such as weather
                        conditions, explosions or fires, which could delay the
                        timing of completion of particular capital projects.
                        Accordingly, actual results may differ materially from
                        current expectations in the forward-looking statement.

                            Investments in investees in 2000 of $35 million
                        largely reflected an investment in stock of VSZ in which
                        USX now holds a 25 percent interest. Investments in
                        investees in 1999 of $15 million was an investment in
                        Republic. Investments in investees in 1998 of $73
                        million mainly reflects funding for entry into a joint
                        venture in the Slovak Republic with VSZ.

                            The acquisition of U. S. Steel Kosice s.r.o. totaled
                        $10 million in 2000 which reflected a $69 million
                        purchase price net of cash acquired in the transaction
                        of $59 million.

                                                                            S-29


                        Management's Discussion and Analysis  continued

                            Net cash changes related to financial obligations
                        increased by $1,202 million, $486 million and $9 million
                        in 2000, 1999 and 1998, respectively. Financial
                        obligations consist of the U. S. Steel Group's portion
                        of USX debt and preferred stock of a subsidiary
                        attributed to both groups as well as debt and financing
                        agreements specifically attributed to the U. S. Steel
                        Group. The increase in 2000 primarily reflected the net
                        effects of cash used in operating activities, including
                        a VEBA contribution, cash used in investing activities,
                        dividend payments and preferred stock repurchases. The
                        increase in 1999 primarily reflected the net effects of
                        cash used in operating and investing activities and
                        dividend payments. For a discussion of USX financing
                        activities attributed to both groups, see Management's
                        Discussion and Analysis of USX Consolidated Financial
                        Condition, Cash Flows and Liquidity.

                        Derivative Instruments

                            See Quantitative and Qualitative Disclosures About
                        Market Risk for discussion of derivative instruments and
                        associated market risk for U. S. Steel Group.

                        Liquidity

                            For discussion of USX's liquidity and capital
                        resources, see Management's Discussion and Analysis of
                        USX Consolidated Financial Condition, Cash Flows and
                        Liquidity.

Management's Discussion and Analysis of Environmental Matters, Litigation and
Contingencies

                            The U. S. Steel Group has incurred and will continue
                        to incur substantial capital, operating and maintenance,
                        and remediation expenditures as a result of
                        environmental laws and regulations. In recent years,
                        these expenditures have been mainly for process changes
                        in order to meet Clean Air Act obligations, although
                        ongoing compliance costs have also been significant. To
                        the extent these expenditures, as with all costs, are
                        not ultimately reflected in the prices of the U. S.
                        Steel Group's products and services, operating results
                        will be adversely affected. The U. S. Steel Group
                        believes that all of its domestic competitors are
                        subject to similar environmental laws and regulations.
                        However, the specific impact on each competitor may vary
                        depending on a number of factors, including the age and
                        location of its operating facilities, marketing areas,
                        production processes and the specific products and
                        services it provides. To the extent that competitors are
                        not required to undertake equivalent costs in their
                        operations, the competitive position of the U. S. Steel
                        Group could be adversely affected.

                            In addition, the U. S. Steel Group expects to incur
                        capital expenditures for its USSK operation to meet
                        environmental standards under the Slovak Republic's
                        environmental laws.

                            The U. S. Steel Group's environmental expenditures
                        for the last three years were/(a)/:



                        (Dollars in millions)                                                    2000         1999         1998
                        ---------------------------------------------------------------------------------------------------------
                                                                                                               
                        Capital                                                               $     18     $     32     $     49
                        Compliance
                         Operating & maintenance                                                   194          199          198
                         Remediation/(b)/                                                           18           22           19
                                                                                              ---------    ---------    ---------
                              Total U. S. Steel Group                                         $    230     $    253     $    266
                        ---------------------------------------------------------------------------------------------------------


                        /(a)/ Based on previously established U. S. Department
                              of Commerce survey guidelines.
                        /(b)/ These amounts include spending charged against
                              remediation reserves, net of recoveries where
                              permissible, but do not include noncash provisions
                              recorded for environmental remediation.

                            The U. S. Steel Group's environmental capital
                        expenditures accounted for 7%, 11% and 16% of total
                        capital expenditures in 2000, 1999 and 1998,
                        respectively.


S-30


                        Management's Discussion and Analysis  continued

                            Compliance expenditures represented 4% of the U. S.
                        Steel Group's total costs and expenses in 2000, 1999 and
                        1998. Remediation spending during 1998 to 2000 was
                        mainly related to remediation activities at former and
                        present operating locations. These projects include
                        remediation of contaminated sediments in a river that
                        receives discharges from the Gary Works and the closure
                        of permitted hazardous and non-hazardous waste
                        landfills.

                            The Resource Conservation and Recovery Act ("RCRA")
                        establishes standards for the management of solid and
                        hazardous wastes. Besides affecting current waste
                        disposal practices, RCRA also addresses the
                        environmental effects of certain past waste disposal
                        operations, the recycling of wastes and the regulation
                        of storage tanks.

                            The U. S. Steel Group is in the study phase of RCRA
                        corrective action programs at its Fairless Works and its
                        former Geneva Works. A RCRA corrective action program
                        has been initiated at its Gary Works and its Fairfield
                        Works. Until the studies are completed at these
                        facilities, USX is unable to estimate the total cost of
                        remediation activities that will be required.

                            USX has been notified that it is a potential
                        responsible party ("PRP") at 25 waste sites related to
                        the U. S. Steel Group under the Comprehensive
                        Environmental Response, Compensation and Liability Act
                        ("CERCLA") as of December 31, 2000. In addition, there
                        are 17 sites related to the U. S. Steel Group where USX
                        has received information requests or other indications
                        that USX may be a PRP under CERCLA but where sufficient
                        information is not presently available to confirm the
                        existence of liability or make any judgment as to the
                        amount thereof. There are also 29 additional sites
                        related to the U. S. Steel Group where remediation is
                        being sought under other environmental statutes, both
                        federal and state, or where private parties are seeking
                        remediation through discussions or litigation. At many
                        of these sites, USX is one of a number of parties
                        involved and the total cost of remediation, as well as
                        USX's share thereof, is frequently dependent upon the
                        outcome of investigations and remedial studies. The U.
                        S. Steel Group accrues for environmental remediation
                        activities when the responsibility to remediate is
                        probable and the amount of associated costs is
                        reasonably determinable. As environmental remediation
                        matters proceed toward ultimate resolution or as
                        additional remediation obligations arise, charges in
                        excess of those previously accrued may be required. See
                        Note 26 to the U. S. Steel Group Financial Statements.

                            In October 1996, USX was notified by the Indiana
                        Department of Environmental Management ("IDEM") acting
                        as lead trustee, that IDEM and the U. S. Department of
                        the Interior had concluded a preliminary investigation
                        of potential injuries to natural resources related to
                        releases of hazardous substances from various municipal
                        and industrial sources along the east branch of the
                        Grand Calumet River and Indiana Harbor Canal. The public
                        trustees completed a pre-assessment screen pursuant to
                        federal regulations and have determined to perform a
                        Natural Resource Damages Assessment. USX was identified
                        as a PRP along with 15 other companies owning property
                        along the river and harbor canal. USX and eight other
                        PRPs have formed a joint defense group. The trustees
                        notified the public of their plan for assessment and
                        later adopted the plan. In 2000, the trustees concluded
                        their assessment of sediment injuries, which includes a
                        technical review of environmental conditions. The PRP
                        joint defense group is discussing settlement
                        opportunities with the trustees and the U.S.
                        Environmental Protection Agency ("EPA").

                            In 1997, USS/Kobe Steel Company ("USS/Kobe"), a
                        joint venture between USX and Kobe Steel, Ltd. ("Kobe"),
                        was the subject of a multi-media audit by the EPA that
                        included an air, water and hazardous waste compliance
                        review. USS/Kobe and the EPA entered into a tolling
                        agreement pending issuance of the final audit and
                        commenced settlement negotiations in July 1999. In
                        August 1999, the

                                                                            S-31


                        Management's Discussion and Analysis  continued

                        steelmaking and bar producing operations of USS/Kobe
                        were combined with companies controlled by Blackstone
                        Capital Partners II to form Republic. The tubular
                        operations of USS/Kobe were transferred to a newly
                        formed entity, Lorain Tubular Company, LLC ("Lorain
                        Tubular"), which operated as a joint venture between USX
                        and Kobe until December 31, 1999 when USX purchased all
                        of Kobe's interest in Lorain Tubular. Republic and
                        Lorain Tubular are continuing negotiations with the EPA.
                        Most of the matters raised by the EPA relate to
                        Republic's facilities; however, air discharges from
                        Lorain Tubular's #3 seamless pipe mill have also been
                        cited. Lorain Tubular will be responsible for matters
                        relating to its facilities. The final report and
                        citations from the EPA have not been issued.

                            In 1998, USX entered into a consent decree with the
                        EPA which resolved alleged violations of the Clean Water
                        Act National Pollution Discharge Elimination System
                        ("NPDES") permit at Gary Works and provides for a
                        sediment remediation project for a section of the Grand
                        Calumet River that runs through Gary Works.
                        Contemporaneously, USX entered into a consent decree
                        with the public trustees which resolves potential
                        liability for natural resource damages on the same
                        section of the Grand Calumet River. In 1999, USX paid
                        civil penalties of $2.9 million for the alleged water
                        act violations and $0.5 million in natural resource
                        damages assessment costs. In addition, USX will pay the
                        public trustees $1 million at the end of the remediation
                        project for future monitoring costs and USX is obligated
                        to purchase and restore several parcels of property that
                        have been or will be conveyed to the trustees. During
                        the negotiations leading up to the settlement with EPA,
                        capital improvements were made to upgrade plant systems
                        to comply with the NPDES requirements. The sediment
                        remediation project is an approved final interim measure
                        under the corrective action program for Gary Works and
                        is expected to cost approximately $36.4 million over the
                        next five years. Estimated remediation and monitoring
                        costs for this project have been accrued.

                            In February 1999, the U.S. Department of Justice and
                        EPA issued a letter demanding a cash payment of
                        approximately $4 million to resolve a Finding of
                        Violation issued in 1997 alleging improper sampling of
                        benzene waste streams at Gary Coke. On September 18,
                        2000, a Consent Decree was entered which required USX to
                        pay a civil penalty of $587,000 and to replace PCB
                        transformers as a Supplemental Environmental Program at
                        a cost of approximately $2.2 million. Payment of the
                        civil penalty was made on October 13, 2000.

                            The Berks Associates/Douglassville Site ("Berks
                        Site") is situated on a 50-acre parcel located on the
                        Schuylkill River in Berks County, PA. Used oil and
                        solvent reprocessing operations were conducted on the
                        Berks Site between 1941 and 1986. In September 1997, USX
                        signed a consent decree to conduct a feasibility study
                        at the site relating to the alternative remedy. In 1999,
                        a new Record of Decision was approved by the EPA and the
                        U.S. Department of Justice. On January 19, 2001, USX
                        signed a consent decree with the EPA to remediate this
                        site.

                            In 1987, the California Department of Health
                        Services ("DHS") issued a remedial action order for the
                        GBF/Pittsburg landfill near Pittsburg, California. DHS
                        alleged that from 1972 through 1974, Pittsburg Works
                        arranged for the disposal of approximately 2.6 million
                        gallons of waste oil, sludge, caustic mud and acid,
                        which were eventually taken to this landfill for
                        disposal. In 2000, the parties reached a buyout
                        arrangement with a third party remediation firm, whereby
                        the firm agreed to take title to and remediate the site
                        and also indemnify the PRPs. This commitment was backed
                        by pollution insurance. USX's share to participate in
                        the buyout was approximately $1.1 million. Payment of
                        the USX buyout amount was made December 2000. Title to
                        the site was transferred to the remediation firm on
                        January 31, 2001.

S-32


                        Management's Discussion and Analysis  continued

                            New or expanded environmental requirements, which
                        could increase the U. S. Steel Group's environmental
                        costs, may arise in the future. USX intends to comply
                        with all legal requirements regarding the environment,
                        but since many of them are not fixed or presently
                        determinable (even under existing legislation) and may
                        be affected by future legislation, it is not possible to
                        predict accurately the ultimate cost of compliance,
                        including remediation costs which may be incurred and
                        penalties which may be imposed. However, based on
                        presently available information, and existing laws and
                        regulations as currently implemented, the U. S. Steel
                        Group does not anticipate that environmental compliance
                        expenditures (including operating and maintenance and
                        remediation) will materially increase in 2001. The U. S.
                        Steel Group's capital expenditures for environmental are
                        expected to be approximately $20 million in 2001 and are
                        expected to be spent on projects primarily at Gary Works
                        and USSK. Predictions beyond 2001 can only be broad-
                        based estimates which have varied, and will continue to
                        vary, due to the ongoing evolution of specific
                        regulatory requirements, the possible imposition of more
                        stringent requirements and the availability of new
                        technologies to remediate sites, among other matters.
                        Based upon currently identified projects, the U. S.
                        Steel Group anticipates that environmental capital
                        expenditures will be approximately $51 million in 2002;
                        however, actual expenditures may vary as the number and
                        scope of environmental projects are revised as a result
                        of improved technology or changes in regulatory
                        requirements and could increase if additional projects
                        are identified or additional requirements are imposed.

                            USX is the subject of, or a party to, a number of
                        pending or threatened legal actions, contingencies and
                        commitments relating to the U. S. Steel Group involving
                        a variety of matters, including laws and regulations
                        relating to the environment, certain of which are
                        discussed in Note 26 to the U. S. Steel Group Financial
                        Statements. The ultimate resolution of these
                        contingencies could, individually or in the aggregate,
                        be material to the U. S. Steel Group Financial
                        Statements. However, management believes that USX will
                        remain a viable and competitive enterprise even though
                        it is possible that these contingencies could be
                        resolved unfavorably to the U. S. Steel Group.

Management's Discussion and Analysis of Operations

                            Despite a strong start, 2000 turned out to be a
                        difficult year for the domestic steel industry. Steel
                        imports to the United States accounted for an estimated
                        27%, 26% and 30% of the domestic steel market for 2000,
                        1999 and 1998, respectively. In 2000, steel imports of
                        pipe increased 37% and imports of hot rolled sheets
                        increased 19%, compared to 1999.

                            For the U. S. Steel Group in 2000, domestic sheet
                        and semi-finished product shipments decreased 9%
                        compared to 1999. In addition, higher natural gas prices
                        increased production cost by approximately $70 million
                        over 1999. Nevertheless, average realized steel prices
                        were 7.1% higher in 2000 versus 1999 due primarily to a
                        strong tubular market and a better product mix from
                        including Lorain Tubular shipments, effective January 1,
                        2000. However, sheet prices deteriorated during the
                        second half of the year to fourth quarter levels which
                        were among the lowest in the last 20 years. By year-end,
                        several competitors had filed for Chapter 11 bankruptcy,
                        adding more uncertainty to already weak steel markets.

                            Total steel shipments were 11.1 million tons in
                        2000, 10.6 million tons in 1999, and 10.7 million tons
                        in 1998. Domestic Steel shipments comprised
                        approximately 9.8% of the domestic steel market in 2000.
                        Domestic Steel shipments were negatively affected by
                        high import levels in 1998, 1999 and 2000 and by weak
                        tubular markets in 1999 and 1998. Exports accounted for
                        approximately 5% of Domestic Steel shipments in 2000, 3%
                        in 1999 and 4% in 1998.


                                                                            S-33


                        Management's Discussion and Analysis  continued

                            Domestic raw steel production was 11.4 million tons
                        in 2000, compared with 12.0 million tons in 1999 and
                        11.2 million tons in 1998. Domestic raw steel production
                        averaged 89% of capability in 2000, compared with 94% of
                        capability in 1999 and 88% of capability in 1998. In
                        2000, domestic raw steel production was negatively
                        impacted by a planned reline at Gary Works No. 4 blast
                        furnace in July 2000. Because of market conditions,
                        U. S. Steel Group limited its domestic production by
                        keeping the Gary Works No. 4 blast furnace out of
                        service through year-end 2000. In 1998, domestic raw
                        steel production was negatively affected by a planned
                        reline at Gary Works No. 6 blast furnace, an unplanned
                        blast furnace outage at the Gary Works No. 13 blast
                        furnace, and the idling of certain facilities as a
                        result of the increase in imports. Because of market
                        conditions, U. S. Steel Group curtailed its domestic
                        production by keeping the Gary Works No. 6 blast furnace
                        out of service until February 1999, after a scheduled
                        reline was completed in mid-August 1998. In addition,
                        domestic raw steel production was cut back at Mon Valley
                        Works and Fairfield Works during 1998. U. S. Steel's
                        stated annual domestic raw steel production capability
                        was 12.8 million tons in 2000, 1999 and 1998. USSK's
                        stated annual raw steel production capability for 2000
                        was 4.5 million net tons. After the acquisition, raw
                        steel production at USSK in 2000 averaged 82% of
                        capability.

                            On November 13, 2000, U. S. Steel Group joined with
                        eight other producers and the Independent Steelworkers
                        Union to file trade cases against hot-rolled carbon
                        steel flat products from 11 countries (Argentina, India,
                        Indonesia, Kazakhstan, the Netherlands, the People's
                        Republic of China, Romania, South Africa, Taiwan,
                        Thailand and Ukraine). Three days later, the USWA also
                        entered the cases as a petitioner. Antidumping ("AD")
                        cases were filed against all the countries and
                        countervailing duty ("CVD") cases were filed against
                        Argentina, India, Indonesia, South Africa, and Thailand.
                        On December 28, 2000, the U.S. International Trade
                        Commission ("ITC") made a preliminary determination that
                        there is a reasonable indication that the domestic
                        industry is being materially injured by the imports in
                        question. As a result, both the ITC and U.S. Department
                        of Commerce ("Commerce") will continue their
                        investigations in these cases.

                            U. S. Steel Group believes that the remedies
                        provided by U.S. law to private litigants are
                        insufficient to correct the widespread dumping and
                        subsidy abuses that currently characterize steel imports
                        into our country. U. S. Steel Group, nevertheless,
                        intends to file additional AD and CVD petitions against
                        unfairly traded imports that adversely impact, or
                        threaten to adversely impact, the results of the U. S.
                        Steel Group and is urging the U.S. government to take
                        additional steps.

                            On July 3, 2000, Commerce and the ITC initiated
                        mandatory five-year "sunset" reviews of AD orders issued
                        in 1995 against seamless pipe from Argentina, Brazil,
                        Germany and Italy and oil country tubular goods ("OCTG")
                        from Argentina, Italy, Japan, Mexico and South Korea.
                        The reviews also encompass the 1995 CVD orders against
                        the same two products from Italy. The "sunset" review
                        procedures require that an order must be revoked after
                        five years unless Commerce and the ITC determine that,
                        if the orders would be discontinued, dumping or a
                        countervailable subsidy would be likely to continue or
                        recur and material injury to the domestic industry would
                        be likely to continue or recur. Of the 11 orders, 8 are
                        the subject of expedited review at Commerce because
                        there was no response, inadequate response, or waiver of
                        participation by the respondent parties. Therefore, at
                        Commerce, only three of the orders (AD: OCTG from
                        Mexico; and CVD: OCTG and seamless pipe from Italy) are
                        the subject of a full review. The ITC is conducting full
                        reviews of all the cases, despite the fact that
                        responses by some of the respondent countries were
                        inadequate.

S-34


                        Management's Discussion and Analysis  continued

                            The U. S. Steel Group depreciates domestic steel
                        assets by modifying straight-line depreciation based on
                        the level of production. Depreciation charges for 2000,
                        1999, and 1998 were 94%, 99%, and 93%, respectively, of
                        straight-line depreciation based on production levels
                        for each of the years. See Note 2 to the U. S. Steel
                        Group Financial Statements.

                        Outlook for 2001

                            This outlook is as of the original filing date of
                        March 12, 2001. For an updated outlook, see subsequent
                        filings with the U.S. Securities and Exchange
                        Commission.

                            Domestic Steel's order book and prices remain soft
                        due to continued high import volumes (which in 2000 were
                        second only to record-year 1998 levels), a draw-down of
                        inventories by spot purchasers and increasing evidence
                        that the growth in the domestic economy is slowing. In
                        addition to these factors, our plate products business
                        is being impacted by recently added domestic capacity.
                        Although domestic shipments for the first quarter of
                        2001 are projected to be somewhat better than fourth
                        quarter 2000 levels, we expect that sheet and plate
                        pricing, which declined markedly in the fourth quarter,
                        will continue to be depressed as a result of the factors
                        cited above. The tubular business, however, remains
                        strong. For the year 2001, domestic shipments are
                        expected to be approximately 11 million net tons,
                        excluding any shipments from the potential acquisition
                        of LTV Corporation tin operations. For the year 2001,
                        USSK shipments are expected to be approximately 3.3
                        million to 3.6 million net tons.

                            High natural gas prices adversely affected our
                        results in 2000 and are expected to persist for some
                        time. The blast furnace idled at Gary Works in July 2000
                        for a planned 10-day outage remained down until late
                        February 2001 due to business conditions. The U. S.
                        Steel Group has continued its cost reduction efforts,
                        and has recently requested from its current suppliers an
                        immediate, temporary eight percent price reduction from
                        existing levels to help weather this difficult period.

                            Several domestic competitors recently have filed for
                        Chapter 11 bankruptcy protection. This provides them
                        with certain competitive advantages and further
                        demonstrates the very difficult economic circumstances
                        faced by the domestic industry.

                            U. S. Steel Group's income from operations includes
                        net pension credits, which are primarily noncash,
                        associated with all of U. S. Steel's pension plans. Net
                        pension credits were $266 million in 2000. At the end of
                        2000, U. S. Steel's main pension plans' transition asset
                        was fully amortized, decreasing the pension credit by
                        $69 million annually in future years for this component.
                        In addition, for the year 2001, low marketplace returns
                        on trust assets in the year 2000 and pending business
                        combinations in the current year are expected to further
                        reduce net pension credits to approximately $160
                        million. The above includes forward-looking statements
                        concerning net pension credits which can vary depending
                        upon the market performance of plan assets, changes in
                        actuarial assumptions regarding such factors as the
                        selection of a discount rate and rate of return on plan
                        assets, changes in the amortization levels of transition
                        amounts or prior period service costs, plan amendments
                        affecting benefit payout levels, business combinations
                        and profile changes in the beneficiary populations being
                        valued. Changes in any of these factors could cause net
                        pension credits to change. To the extent net pension
                        credits decline in the future, income from operations
                        would be adversely affected.

                            The U. S. Steel Group includes a 16 percent equity
                        method investment in Republic (through an ownership
                        interest in Republic Technologies International
                        Holdings, LLC ("Republic Holdings"), which is the sole
                        owner of Republic). In the third quarter of 2000,
                        Republic announced that it had completed a financial
                        restructuring to improve its liquidity position.
                        Republic raised approximately $30 million in loans from
                        certain of its direct and indirect equity partners in
                        exchange for notes of Republic and

                                                                            S-35


                        Management's Discussion and Analysis  continued

                        warrants to purchase Class D common stock of Republic
                        Technologies International, Inc., Republic's majority
                        owner. The U. S. Steel Group's portion was approximately
                        $6 million and the U. S. Steel Group also agreed to
                        certain deferred payment terms into the year 2002, up to
                        a maximum of $30 million, with regard to Republic's
                        obligations relating to iron ore pellets supplied to
                        Republic. In its Form 10-Q for the period ended
                        September 30, 2000, which was filed with the SEC on
                        October 31, 2000, Republic Holdings stated that
                        "Notwithstanding these efforts, [Republic Holdings] may
                        need to obtain additional financing to meet its cash
                        flow requirements, including financing from the sale of
                        additional debt or equity securities." Republic Holdings
                        also stated "As a result of the factors mentioned above,
                        [Republic Holdings] is highly leveraged and could be
                        considered a risky investment."

                            At December 31, 2000, the U. S. Steel Group's
                        financial exposure to Republic totaled approximately
                        $131 million, consisting of amounts owed by Republic to
                        the U. S. Steel Group and debt obligations assumed by
                        Republic.

                            In early October 2000, the U. S. Steel Group
                        announced an agreement with LTV Corporation ("LTV") to
                        purchase LTV's tin mill products business, including its
                        Indiana Harbor, Indiana tin operations. This acquisition
                        recently closed and was effective March 1, 2001. Terms
                        of this noncash transaction call for the U. S. Steel
                        Group to assume certain employee-related obligations of
                        LTV. The U. S. Steel Group intends to operate these
                        facilities as an ongoing business and tin mill employees
                        at Indiana Harbor became U. S. Steel Group employees.
                        The U. S. Steel Group and LTV also entered into 5-year
                        agreements for LTV to supply the U. S. Steel Group with
                        pickled hot bands and for the U. S. Steel Group to
                        provide LTV with processing of cold rolled steel.

                            In October 2000, Transtar announced it had entered
                        into a Reorganization and Exchange Agreement with its
                        two voting shareholders. Upon closing, Transtar and
                        certain of its subsidiaries, namely, the Birmingham
                        Southern Railroad Company; the Elgin, Joliet and Eastern
                        Railway Company; the Lake Terminal Railroad Company; the
                        McKeesport Connecting Railroad Company; the Mobile River
                        Terminal Company, Inc.; the Union Railroad Company; the
                        Warrior & Gulf Navigation Company; and Tracks Traffic
                        and Management Services, Inc., will become subsidiaries
                        within the U. S. Steel Group. The other shareholder,
                        Transtar Holdings, L.P., an affiliate of Blackstone
                        Capital Partners L.P., will become the owner of the
                        other subsidiaries.

                            The preceding statements concerning anticipated
                        steel demand, steel pricing, and shipment levels are
                        forward-looking and are based upon assumptions as to
                        future product prices and mix, and levels of steel
                        production capability, production and shipments. These
                        forward-looking statements can be affected by imports,
                        domestic and international economies, domestic
                        production capacity, the completion of the LTV and
                        Transtar transactions, and customer demand. In the event
                        these assumptions prove to be inaccurate, actual results
                        may differ significantly from those presently
                        anticipated.

                        Accounting Standards

                            In the fourth quarter of 2000, USX adopted the
                        following accounting pronouncements primarily related to
                        the classification of items in the financial statements.
                        The adoption of these new pronouncements had no net
                        effect on the financial position or results of
                        operations of USX, although they required
                        reclassifications of certain amounts in the financial
                        statements, including all prior periods presented.

S-36


                        Management's Discussion and Analysis  continued

                            .  In December 1999, the Securities and Exchange
                               Commission ("SEC") issued Staff Accounting
                               Bulletin No. 101 ("SAB 101") "Revenue Recognition
                               in Financial Statements," which summarizes the
                               SEC staff's interpretations of generally accepted
                               accounting principles related to revenue
                               recognition and classification.

                            .  In 2000, the Emerging Issues Task Force of the
                               Financial Accounting Standards Board ("EITF")
                               issued EITF consensus No. 99-19 "Reporting
                               Revenue Gross as a Principal versus Net as an
                               Agent", which addresses whether certain items
                               should be reported as a reduction of revenue or
                               as a component of both revenues and cost of
                               revenues, and EITF Consensus No. 00-10
                               "Accounting for Shipping and Handling Fees and
                               Costs," which addresses the classification of
                               costs incurred for shipping goods to customers.

                            .  In September 2000, the Financial Accounting
                               Standards Board issued Statement of Financial
                               Accounting Standards No. 140, "Accounting for
                               Transfers and Servicing of Financial Assets and
                               Extinguishments of Liabilities" ("SFAS 140").
                               SFAS 140 revises the standards for accounting for
                               securitizations and other transfers of financial
                               assets and collateral and requires certain
                               disclosures. USX adopted certain recognition and
                               reclassification provisions of SFAS 140, which
                               were effective for fiscal years ending after
                               December 15, 2000. The remaining provisions of
                               SFAS 140 are effective after March 31, 2001.

                            In June 1998, the Financial Accounting Standards
                        Board issued Statement of Financial Accounting Standards
                        No. 133, "Accounting for Derivative Instruments and
                        Hedging Activities" ("SFAS No. 133"), which later was
                        amended by SFAS Nos. 137 and 138. This Standard requires
                        recognition of all derivatives as either assets or
                        liabilities at fair value. Changes in fair value will be
                        reflected in either current period net income or other
                        comprehensive income, depending on the designation of
                        the derivative instrument. The U. S. Steel Group may
                        elect not to designate a derivative instrument as a
                        hedge even if the strategy would be expected to qualify
                        for hedge accounting treatment. The adoption of SFAS No.
                        133 will change the timing of recognition for derivative
                        gains and losses as compared to previous accounting
                        standards.

                            The U. S. Steel Group will adopt the Standard
                        effective January 1, 2001. The transition adjustment
                        resulting from adoption of SFAS No. 133 will be reported
                        as a cumulative effect of a change in accounting
                        principle. The transition adjustment for the U. S. Steel
                        Group is expected to be immaterial. The amounts reported
                        as other comprehensive income will be reflected in net
                        income when the anticipated physical transactions are
                        consummated. It is not possible to estimate the effect
                        that this Standard will have on future results of
                        operations.

                                                                            S-37


                        Quantitative and Qualitative Disclosures About Market
                        Risk

                        Management Opinion Concerning Derivative Instruments

                            USX uses commodity-based and foreign currency
                        derivative instruments to manage its price risk.
                        Management has authorized the use of futures, forwards,
                        swaps and options to manage exposure to price
                        fluctuations related to the purchase, production or sale
                        of crude oil, natural gas, refined products, and
                        nonferrous metals. For transactions that qualify for
                        hedge accounting, the resulting gains or losses are
                        deferred and subsequently recognized in income from
                        operations, in the same period as the underlying
                        physical transaction. Derivative instruments used for
                        trading and other activities are marked-to-market and
                        the resulting gains or losses are recognized in the
                        current period in income from operations. While USX's
                        risk management activities generally reduce market risk
                        exposure due to unfavorable commodity price changes for
                        raw material purchases and products sold, such
                        activities can also encompass strategies that assume
                        price risk.

                            Management believes that use of derivative
                        instruments along with risk assessment procedures and
                        internal controls does not expose the U. S. Steel Group
                        to material risk. The use of derivative instruments
                        could materially affect the U. S. Steel Group's results
                        of operations in particular quarterly or annual periods.
                        However, management believes that use of these
                        instruments will not have a material adverse effect on
                        financial position or liquidity. For a summary of
                        accounting policies related to derivative instruments,
                        see Note 2 to the U. S. Steel Group Financial
                        Statements.

                        Commodity Price Risk and Related Risks

                            In the normal course of its business, the U. S.
                        Steel Group is exposed to market risk or price
                        fluctuations related to the purchase, production or sale
                        of steel products. To a lesser extent, the U. S. Steel
                        Group is exposed to price risk related to the purchase,
                        production or sale of coal and coke and the purchase of
                        natural gas, steel scrap and certain nonferrous metals
                        used as raw materials.

                            The U. S. Steel Group's market risk strategy has
                        generally been to obtain competitive prices for its
                        products and services and allow operating results to
                        reflect market price movements dictated by supply and
                        demand. However, the U. S. Steel Group uses derivative
                        commodity instruments (primarily over-the-counter
                        commodity swaps) to manage exposure to fluctuations in
                        the purchase price of natural gas, heating oil and
                        certain nonferrous metals. The use of these instruments
                        has not been significant in relation to the U. S. Steel
                        Group's overall business activity.

                            The U. S. Steel Group recorded net pretax other than
                        trading activity gains of $2 million in 2000, losses of
                        $4 million in 1999 and losses of $6 million in 1998.
                        These gains and losses were offset by changes in the
                        realized prices of the underlying hedged commodities.
                        For additional quantitative information relating to
                        derivative commodity instruments, including aggregate
                        contract values and fair values, where appropriate, see
                        Note 24 to the U. S. Steel Group Financial Statements.

S-38


                        Quantitative and Qualitative Disclosures
                        About Market Risk  continued

                        Interest Rate Risk

                            USX is subject to the effects of interest rate
                        fluctuations on certain of its non-derivative financial
                        instruments. A sensitivity analysis of the projected
                        incremental effect of a hypothetical 10% decrease in
                        year-end 2000 and 1999 interest rates on the fair value
                        of the U. S. Steel Group's specifically attributed
                        non-derivative financial instruments and the U. S. Steel
                        Group's portion of USX's non-derivative financial
                        instruments attributed to both groups, is provided in
                        the following table:



                        (Dollars in millions)
                        -----------------------------------------------------------------------------------------------------------
                        As of December 31,                                                 2000                     1999
                                                                                               Incremental              Incremental
                                                                                               Increase in              Increase in
                                                                                    Fair          Fair         Fair        Fair
                        Non-Derivative Financial Instruments/(a)/                Value/(b)/   Value/(c)/   Value/(b)/   Value/(c)/
                        -----------------------------------------------------------------------------------------------------------
                                                                                                            
                        Financial assets:
                         Investments and long-term receivables/(d)/              $     137    $       -    $     122      $       -
                        Financial liabilities:
                         Long-term debt/(e)(f)/                                  $   2,375    $      80    $     835      $      20
                         Preferred stock of subsidiary/(g)/                             63            5           63              5
                         USX obligated mandatorily
                           redeemable convertible preferred
                           securities of a subsidiary trust/(g)/                       119           10          169             15
                                                                                 ---------    ---------    ---------      ---------
                              Total liabilities                                  $   2,557    $      95    $   1,067      $      40
                        -----------------------------------------------------------------------------------------------------------


                        /(a)/ Fair values of cash and cash equivalents,
                              receivables, notes payable, accounts payable and
                              accrued interest, approximate carrying value and
                              are relatively insensitive to changes in interest
                              rates due to the short-term maturity of the
                              instruments. Accordingly, these instruments are
                              excluded from the table.
                        /(b)/ See Note 25 to the U. S. Steel Group Financial
                              Statements for carrying value of instruments.
                        /(c)/ Reflects, by class of financial instrument, the
                              estimated incremental effect of a hypothetical 10%
                              decrease in interest rates at December 31, 2000
                              and December 31, 1999, on the fair value of USX's
                              non-derivative financial instruments. For
                              financial liabilities, this assumes a 10% decrease
                              in the weighted average yield to maturity of USX's
                              long-term debt at December 31, 2000 and December
                              31, 1999.
                        /(d)/ For additional information, see Note 16 to the U.
                              S. Steel Group Consolidated Financial Statements.
                        /(e)/ Includes amounts due within one year.
                        /(f)/ Fair value was based on market prices where
                              available, or current borrowing rates for
                              financings with similar terms and maturities. For
                              additional information, see Note 11 to the U. S.
                              Steel Group Financial Statements.
                        /(g)/ See Note 22 to the USX Consolidated Financial
                              Statements.

                            At December 31, 2000, USX's portfolio of long-term
                        debt was comprised primarily of fixed-rate instruments.
                        Therefore, the fair value of the portfolio is relatively
                        sensitive to effects of interest rate fluctuations. This
                        sensitivity is illustrated by the $80 million increase
                        in the fair value of long-term debt assuming a
                        hypothetical 10% decrease in interest rates. However,
                        USX's sensitivity to interest rate declines and
                        corresponding increases in the fair value of its debt
                        portfolio would unfavorably affect USX's results and
                        cash flows only to the extent that USX elected to
                        repurchase or otherwise retire all or a portion of its
                        fixed-rate debt portfolio at prices above carrying
                        value.

                                                                            S-39


                        Quantitative and Qualitative Disclosures
                        About Market Risk  continued

                        Foreign Currency Exchange Rate Risk

                            USX is subject to the risk of price fluctuations
                        related to anticipated revenues and operating costs,
                        firm commitments for capital expenditures and existing
                        assets or liabilities denominated in currencies other
                        than U.S. dollars, in particular the Euro and Slovak
                        koruna. USX has not generally used derivative
                        instruments to manage this risk. However, USX has made
                        limited use of forward currency contracts to manage
                        exposure to certain currency price fluctuations. At
                        December 31, 2000, the U. S. Steel Group had no open
                        forward currency contracts.

                        Equity Price Risk

                            USX is subject to equity price risk and liquidity
                        risk related to its investment in VSZ, which is
                        attributed to the U. S. Steel Group. These risks are not
                        readily quantifiable.

                        Safe Harbor

                            The U. S. Steel Group's quantitative and qualitative
                        disclosures about market risk include forward-looking
                        statements with respect to management's opinion about
                        risks associated with the U. S. Steel Group's use of
                        derivative instruments. These statements are based on
                        certain assumptions with respect to market prices and
                        industry supply of and demand for steel products and
                        certain raw materials. To the extent that these
                        assumptions prove to be inaccurate, future outcomes with
                        respect to the U. S. Steel Group's hedging programs may
                        differ materially from those discussed in the
                        forward-looking statements.

S-40


                                    PART IV

Item 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K

     A. Documents Filed as Part of the Report
     1. Financial Statements
        Financial Statements filed as part of this report are listed on
        the Index to Financial Statements, Supplementary Data,
        Management's Discussion and Analysis, and Quantitative and
        Qualitative Disclosures About Market Risk of USX Consolidated,
        the Marathon Group and the U. S. Steel Group, immediately
        preceding pages U-1, M-1 and S-1, respectively.

     2. Financial Statement Schedules and Supplementary Data
           The financial statement Schedule II - Valuation and
           Qualifying Accounts is included on page 60. All other
           schedules are omitted because they are not applicable or the
           required information is contained in the applicable
           financial statements or notes thereto.

           Supplementary Data -
           Summarized Financial Information of Marathon Oil Company is
           provided on page 63. Disclosures About Forward-Looking
           Statements are provided beginning on page 64.

     B. Reports on Form 8-K

        Form 8-K dated October 19, 2000, reporting under Item 5. Other
        Events and Regulation FD Disclosure, that the Marathon Group
        Earnings Release reported that Marathon has signed a definitive
        agreement with Shell to transfer its 37.5 percent interest in
        Sakhalin Energy Investment Company Ltd. The increased
        likelihood of closing this transaction triggered a one-time,
        noncash deferred tax charge of $235 million in the third
        quarter.

        Form 8-K dated November 22, 2000, reporting under Item 9.
        Regulation FD Disclosure, the press release titled "U. S. Steel
        Group Experiencing Coal Production Problems at Two Mines".

        Form 8-K dated November 29, 2000, reporting under Item 9.
        Regulation FD Disclosure, the press releases titled "Surma
        Named President of Marathon Ashland Petroleum LLC" and
        "Marathon Announces new Executive Vice President".

        Form 8-K dated November 30, 2000, reporting under Item 9.
        Regulation FD Disclosure, the press release titled "USX to
        Retain Advisors to Study its Capital Structure".

        Form 8-K dated November 30, 2000, reporting under Item 9.
        Regulation FD Disclosure, the press release titled "Marathon
        Reviews Progress of Upstream and Downstream Businesses".

        Form 8-K dated December 6, 2000, reporting under Item 9.
        Regulation FD Disclosure, the press release titled "Marathon
        Sakhalin Limited and Shell Sakhalin Holdings B.V. complete
        exchange agreement".

        Form 8-K dated December 28, 2000, reporting under Item 9.
        Regulation FD Disclosure, that in December 2000, USX-U. S.
        Steel Group made a voluntary $500 million contribution to the
        Voluntary Employee Benefit Association (VEBA), which was
        established as part of the 1994 agreement with the United
        Steelworkers of America to pay retiree health care and life
        insurance benefits for steelworker retirees.

        Form 8-K dated December 28, 2000, reporting under Item 9.
        Regulation FD Disclosure, the press release titled "Marathon
        and Kinder Morgan agree to form Permian Basin joint venture".

        Form 8-K dated January 24, 2001, reporting under Item 9.
        Regulation FD Disclosure, the USX-Marathon Group and USX-U. S.
        Steel Group Earnings Releases".

                                       56


        Form 8-K dated February 27, 2001, reporting under Item 5. Other
        Events, the filing of the audited Financial Statements and
        Supplementary Data for the fiscal year ended December 31, 2000,
        reports of independent accountants.

     C. Exhibits

Exhibit No.

     2. Plan of Acquisition, Reorganization, Arrangement
        Liquidation or Succession
          None

     3. Articles of Incorporation and By-Laws
        (a)  USX Restated Certificate of
          Incorporation dated May 1, 1999.......   Incorporated by reference to
                                                   Exhibit 3.1 to the USX Report
                                                   on Form 10-Q for the quarter
                                                   ended June 30, 1999.

        (b)  USX By-Laws, effective
             as of May 1, 1999..................   Incorporated by reference to
                                                   Exhibit 3.2 to the USX Report
                                                   on Form 10-Q for the quarter
                                                   ended June 30, 1999.

     4. Instruments Defining the Rights of Security Holders,
        Including Indentures
        (a)  Five-Year Credit Agreement dated
             as of November 30, 2000............

        (b)  Rights Agreement, dated as of
             September 28, 1999, between
             USX Corporation and ChaseMellon
             Shareholder Services, L.L.C.,
             as Rights Agent...................    Incorporated by reference to
                                                   Exhibit 4 to USX's Form 8-K
                                                   filed on September 28, 1999.

        (c)  Pursuant to 17 CFR 229.601(b)(4)(iii),
             instruments with respect to long-term debt
             issues have been omitted where the amount
             of securities authorized under such
             instruments does not exceed 10% of the total
             consolidated assets of USX. USX hereby agrees
             to furnish a copy of any such instrument to the
             Commission upon its request.

                                       57


     10. Material Contracts

         (a)  USX 1990 Stock Plan,
              As Amended April 28, 1998..........   Incorporated by reference to
                                                    Annex II to the USX Proxy
                                                    Statement dated March 9,
                                                    1998.

         (b)  USX Annual Incentive Compensation
              Plan, As Amended July 25, 2000.....

         (c)  USX Senior Executive Officer Annual
              Incentive Compensation Plan,
              As Amended April 28, 1998..........   Incorporated by reference to
                                                    Annex I to the USX Proxy
                                                    Statement dated March 9,
                                                    1998.

         (d)  Marathon Oil Company Annual
              Incentive Compensation Plan, As
              Amended November 23, 1999..........   Incorporated by reference to
                                                    Exhibit 10(d) of USX Form
                                                    10-K for the year ended
                                                    December 31, 1999.

         (e)  USX Executive Management
              Supplemental Pension Program,
              As Amended January 1, 1999.........   Incorporated by reference to
                                                    Exhibit 10(e) of USX Form
                                                    10-K for the year ended
                                                    December 31, 1999.

         (f)  USX Supplemental Thrift Program,
              As Amended January 1, 1999.........   Incorporated by reference to
                                                    Exhibit 10(f) of USX Form
                                                    10-K for the year ended
                                                    December 31, 1999.

         (g)  Amended and Restated Limited
              Liability Company Agreement of
              Marathon Ashland Petroleum LLC,
              dated as of December 31, 1998......   Incorporated by reference to
                                                    Exhibit 10(h) of USX Form
                                                    10-Q for the quarter ended
                                                    June 30, 1999.

         (h)  Amendment No. 1 dated as of
              December 31, 1998 to the Put/Call,
              Registration Rights and Standstill
              Agreement of Marathon Ashland
              Petroleum LLC dated as of
              January 1, 1998....................   Incorporated by reference to
                                                    Exhibit 10.2 of USX Form 8-K
                                                    dated January 1, 1998, and
                                                    Exhibit 10(i) of USX Form
                                                    10-Q for the quarter ended
                                                    June 30, 1999.

         (i)  Form of Severance Agreements
              between the Corporation and
              Various Officers...................   Incorporated by reference to
                                                    Exhibit 10 of USX Form 10-Q
                                                    for the quarter ended
                                                    September 30, 1999.

         (j)  USX Deferred Compensation Plan
              For Non-Employee Directors
              Amended as of January 1, 1998......

                                       58


         (k)  Agreement between Marathon
              Oil Company and Clarence P.
              Cazalot, Jr., executed
              February 28, 2000.................  Incorporated by reference to
                                                  Exhibit 10(k) of USX Form 10-K
                                                  for the year ended December
                                                  31, 1999.

         (l)  USX Non-Officer Restricted Stock
              Plan, effective January 30, 2001..

     12.1   Computation of Ratio of Earnings to Combined Fixed Charges and
            Preferred Stock Dividends

     12.2   Computation of Ratio of Earnings to Fixed Charges

     21.    List of Significant Subsidiaries

     23.    Consent of Independent Accountants

                                       59


          SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
              YEARS ENDED DECEMBER 31, 2000 AND DECEMBER 31, 1999
                             (Millions of Dollars)


                                                                   Additions
                                                     -------------------------------------
                                        Balance at    Charges to   Charges                                    Balance at
                                        Beginning     Costs and    to Other        Other                        End of
          Description                   of Period     Expenses     Accounts      Additions     Deductions/(a)/  Period
------------------------------------------------------------------------------------------------------------------------
                                                                                          
Year ended December 31, 2000:
 Reserves deducted in the
 balance sheet from the assets
 to which they apply:
  Allowance for doubtful accounts         $   12      $   19       $      -      $   37/(b)/   $     8        $   60
  Inventory market valuation reserve           -           -              -           -              -             -
  Investments and long-term
   receivables reserve                         3           -             36/(c)/      -              1            38
  Tax valuation allowances:
   Federal                                    30           -              -           -             30             -
   State                                      52           -              -           -              2            50
   Foreign                                   282           -              -           -             30           252

Year ended December 31, 1999:
 Reserves deducted in the
 balance sheet from the assets
 to which they apply:
  Allowance for doubtful accounts         $   12      $    5       $      -      $    4/(d)/   $     9        $   12
  Inventory market valuation reserve         551           -              -           -            551             -
  Investments and long-term
    receivabless reserve                      10           -              -           -              7             3
  Tax valuation allowances:
    Federal                                   30           -              -           -              -            30
    State                                     52           -              -           -              -            52
    Foreign                                  260           -             22/(e)/      -              -           282
------------------------------------------------------------------------------------------------------------------------


/(a)/ Deductions for the allowance for doubtful accounts and long-term
      receivables include amounts written off as uncollectible, net of
      recoveries. Deductions for the inventory market valuation reserve reflect
      increases in market prices and inventory turnover, resulting in noncash
      credits to costs and expenses. Reductions in the tax valuation allowances
      reflect changes in the amount of deferred taxes expected to be realized,
      resulting in credits to the provision for income taxes.
/(b)/ Includes $36 million relating to the acquisition of U. S. Steel Kosice
      s.r.o. and $1 million reclassification from long-term reserves.
/(c)/ Includes $36 million classified to dividend and investee income relating
      to a notes receivable from an equity investee.
/(d)/ Includes $2 million relating to the acquisition of Lorain Tubular LLC, and
      $2 million reclassification from long-term reserves.
/(e)/ Additions to the tax valuation allowances are included in the provision
      for income taxes.

                                      60


                                  SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, this report
has been signed below by the following persons on behalf of the registrant and
in the capacity indicated on September 14, 2001.

                                USX CORPORATION

                            By /s/ Larry G. Schultz
                               ----------------------------------
                                   Larry G. Schultz
                               Vice President - Accounting


               Signature                                 Title
               ---------                                 -----

                                                  Chairman of the Board &
                  *                         Chief Executive Officer and Director
----------------------------------------
           Thomas J. Usher
                                         Vice Chairman & Chief Financial Officer
                  *                                      and Director
----------------------------------------
         Robert M. Hernandez

/s/       Larry G. Schultz                      Vice President - Accounting
----------------------------------------
          Larry G. Schultz

                  *                                       Director
----------------------------------------
          Neil A. Armstrong

                  *                             Vice Chairman and Director
----------------------------------------
      Clarence P. Cazalot, Jr.

                  *                                       Director
----------------------------------------
           J. Gary Cooper

                  *                                       Director
----------------------------------------
          Charles A. Corry

                  *                                       Director
----------------------------------------
         Shirley Ann Jackson

                  *                                       Director
----------------------------------------
           Charles R. Lee

                  *                                       Director
----------------------------------------
            Paul E. Lego

                  *                                       Director
----------------------------------------
        John F. McGillicuddy

                  *                                       Director
----------------------------------------
          Seth E. Schofield

                  *                                       Director
----------------------------------------
            John W. Snow

                  *                                       Director
----------------------------------------
          Douglas C. Yearley

*By /s/   Larry G. Schultz
----------------------------------------
      Larry G. Schultz, Attorney-in-Fact

                                       61