FORM 6 - K



                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                        REPORT OF FOREIGN PRIVATE ISSUER
                    PURSUANT TO RULE 13A - 16 OR 15D - 16 OF
                       THE SECURITIES EXCHANGE ACT OF 1934

                                As of May 9, 2005



                                  TENARIS, S.A.
                 (Translation of Registrant's name into English)


                                  TENARIS, S.A.
                           46a, Avenue John F. Kennedy
                                L-1855 Luxembourg
                    (Address of principal executive offices)


Indicate by check mark whether the registrant files or will file annual reports
under cover Form 20-F or 40-F.
                                         /
                            Form 20-F _\/_ Form 40-F____

      Indicate  by  check  mark  whether  the   registrant  by  furnishing   the
information contained in this Form is also thereby furnishing the information to
the Commission  pursuant to Rule 12G3-2(b) under the Securities  Exchange Act of
1934.
                                                /
                                Yes _____ No _\/_


If "Yes" is marked, indicate below the file number assigned to the registrant in
connection with Rule 12g3-2(b): 82- .







The  attached  material  is  being  furnished  to the  Securities  and  Exchange
Commission  pursuant to Rule 13a-16 and Form 6-K under the  Securities  Exchange
Act of 1934, as amended.  This report contains Tenaris'  consolidated  condensed
interim financial statements as of March 31, 2005.



                                    SIGNATURE




Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned, thereunto duly authorized.



Date: May 9, 2005



                                  Tenaris, S.A.




BY: /S/ CECILIA BILESIO
-----------------------
Cecilia Bilesio
Corporate Secretary








                                  TENARIS S.A.





               CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS


                                 MARCH 31, 2005











46a, Avenue John F. Kennedy - 2nd Floor.
L - 1855 Luxembourg

                                       3






CONSOLIDATED CONDENSED INTERIM INCOME STATEMENT


(all amounts in USD thousands, unless otherwise stated)                  THREE-MONTH PERIOD ENDED MARCH
                                                                                       31,
                                                                         --------------------------------
                                                                 NOTES        2005            2004
                                                                         --------------- ----------------
                                                                                   (UNAUDITED)
                                                                                            
Net sales                                                          3          1,452,927          859,346
Cost of sales                                                      4           (865,128)        (620,457)
                                                                         --------------- ----------------
Gross profit                                                                    587,799          238,889
Selling, general and administrative expenses                       5           (185,083)        (139,818)
Other operating income (expenses), net                                            2,967            3,500
                                                                         --------------- ----------------
Operating income                                                                405,683          102,571
Financial income (expenses), net                                   6            (41,807)         (15,438)
                                                                         --------------- ----------------
Income  before  equity  in  earnings  (losses)  of  associated                  363,876           87,133
companies and income tax
Equity in earnings (losses) of associated companies                              30,163            (461)
                                                                         --------------- ----------------
Income before income tax                                                        394,039           86,672
Income tax                                                                     (114,069)         (39,069)
                                                                         --------------- ----------------
Income for the period (1)                                                       279,970           47,603
                                                                         --------------- ----------------
ATTRIBUTABLE TO (1):
Equity holders of the Company                                                   264,234           48,368
Minority interest                                                                15,736            (765)
                                                                         --------------- ----------------
                                                                                279,970           47,603
                                                                         --------------- ----------------

EARNINGS PER SHARE  ATTRIBUTABLE TO THE EQUITY 
HOLDERS OF THE COMPANY DURING THE
PERIOD (1) 
Weighted average number of ordinary shares in issue
(thousands)                                                                   1,180,537        1,180,371
Earnings per share (USD per share)                                                 0.22             0.04


(1) Up to December 31, 2004 minority  interest was shown in the income statement
before net income.  As required by IAS 1 (revised)  as from  January 1, 2005 the
income for the period  disclosed in the income  statement does not show minority
interest.  Earnings  per  share  continue  to be  calculated  on the net  income
attributable solely to the equity holders of Tenaris (see Note 2 (a)).


The  accompanying  notes are an integral  part of these  consolidated  condensed
interim  financial  statements.  The  Report of  Independent  Registered  Public
Accounting Firm on these consolidated  condensed interim financial statements is
issued as a separate document.

                                       1





CONSOLIDATED CONDENSED INTERIM BALANCE SHEET

(all amounts in USD thousands)
                                                       AT MARCH 31, 2005        AT DECEMBER 31, 2004
                                                  ----------------------------  --------------------
                                NOTES                       (UNAUDITED)
ASSETS
NON-CURRENT ASSETS
                                                                              
  Property, plant and equipment, net        7         2,116,339                      2,164,601
  Intangible  assets,  net  (see  Note 2                157,733
(b))                                        7                                           49,211
  Investments in associated companies                   208,108                         99,451
  Other investments                                      23,963                         24,395
  Deferred tax assets                                   153,946                        161,173
  Receivables                                            32,310     2,692,399          151,365     2,650,196
                                                  --------------                 --------------
CURRENT ASSETS
  Inventories                                         1,360,708                      1,269,470
  Receivables and prepayments                           167,690                        279,450
  Current tax assets                                     96,604                         94,996
  Trade receivables                                   1,131,168                        936,931
  Other investments                                           -                        119,666
  Cash and cash equivalents                             477,106     3,233,276          311,579     3,012,092
                                                  ----------------------------   ---------------------------
TOTAL ASSETS                                                        5,925,675                      5,662,288
                                                                ==============                 =============
EQUITY  (SEE NOTE 2 (A))
CAPITAL  AND  RESERVES  ATTRIBUTABLE  TO
THE COMPANY'S EQUITY HOLDERS
  Share capital                                       1,180,537                      1,180,537
  Legal Reserves                                        118,054                        118,054
  Share Premium                                         609,733                        609,733
  Other Distributable Reserve                                82                             82
  Currency translation adjustments                     (71,126)                       (30,020)
  Retained earnings                                     992,547     2,829,827          617,538     2,495,924
                                                  --------------                 --------------
MINORITY INTEREST                                                     178,383                        165,271
                                                                --------------                 --------------
TOTAL EQUITY                                                        3,008,210                      2,661,195
                                                                --------------                 --------------
LIABILITIES
NON-CURRENT LIABILITIES
  Borrowings                                            546,896                        420,751
  Deferred tax liabilities                              346,105                        371,975
  Other liabilities                                     166,882                        172,442
  Provisions                                             33,219                         31,776
  Trade payables                                          4,070     1,097,172            4,303     1,001,247
                                                  --------------                 --------------
CURRENT LIABILITIES
  Borrowings                                            578,915                        838,591
  Current tax liabilities                               276,547                        222,735
  Other liabilities                                     124,056                        176,393
  Provisions                                             36,908                         42,636
  Customers advances                                    189,975                        127,399
  Trade payables                                        613,892     1,820,293          592,092     1,999,846
                                                  ----------------------------   ----------------------------
TOTAL LIABILITIES                                                   2,917,465                      3,001,093
                                                                --------------                 --------------
TOTAL EQUITY AND LIABILITIES                                        5,925,675                      5,662,288
                                                                ==============                 ==============



Contingencies,  commitments and  restrictions to the distribution of profits are
disclosed in Note 8.

The  accompanying  notes are an integral  part of these  consolidated  condensed
interim  financial  statements.  The  Report of  Independent  Registered  Public
Accounting Firm on these consolidated  condensed interim financial statements is
issued as a separate document.

                                       2




CONSOLIDATED CONDENSED INTERIM STATEMENT OF CHANGES IN EQUITY
(all amounts in USD thousands)




                                  -----------------------------------------------------------------------------------------------
                                                        Attributable to equity holders of the Company    
                                  -----------------------------------------------------------------------
                                                                          Other      Currency               Minority             
                                     Share        Legal       Share    Distributable translation Retained  Interest              
                                    Capital      Reserves     Premium    Reserve     adjustments Earnings (see Note 2)    Total  
                                  ------------  ----------  -----------  ---------- ------------ -------- ------------ ----------
                                                                                                                      (Unaudited)
                                                                                                   
Balance at January 1, 2005            1,180,537     118,054     609,733         82    (30,020)    617,538     165,271   2,661,195

Effect of  adopting  IFRS 3
  (see Note 2(b))                          --          --          --         --         --       110,775        --       110,775
                                   ----------------------------------------------------------------------------------------------
Adjusted balance at January 1, 2005   1,180,537     118,054     609,733         82    (30,020)    728,313     165,271   2,771,970
Currency translation differences           --          --          --         --      (41,106)        --       (2,586)    (43,692)
Acquisition of minority interest           --          --          --         --         --           --          (38)        (38)
Income for the period                      --          --          --         --         --       264,234      15,736     279,970
                                   ----------------------------------------------------------------------------------------------
Balance at March 31, 2005             1,180,537     118,054     609,733         82    (71,126)    992,547     178,383   3,008,210
                                   ----------------------------------------------------------------------------------------------
                                                                                                                        
                                  -----------------------------------------------------------------------------------------------
                                                        Attributable to equity holders of the Company                            
                                  -----------------------------------------------------------------------                        
                                                                          Other      Currency               Minority             
                                     Share        Legal       Share    Distributable translation Retained  Interest              
                                    Capital      Reserves     Premium    Reserve     adjustments Earnings (see Note 2)    Total  
                                  ------------  ----------  -----------  ---------- ------------ -------- ------------ ----------
                                                                                                                      (Unaudited)
Balance at January 1, 2004            1,180,288     118,029     609,269     96,555    (34,194)   (128,667)    119,984   1,961,264

Currency translation differences           --          --          --         --       (2,031)        --         (213)     (2,244)
Capital  Increase and acquisition
of minority interest                        249          25         464         82       --           --         (619)        201
Income for the period                      --          --          --         --         --        48,368        (765)     47,603
                                   ----------------------------------------------------------------------------------------------
Balance at March 31, 2004             1,180,537     118,054     609,733     96,637    (36,225)    (80,299)    118,397   2,006,824
                                   ----------------------------------------------------------------------------------------------



The  Distributable   Reserve  and  Retained  Earnings  calculated  according  to
Luxembourg Law are disclosed in Note 8 (v).

The accompanying notes are an integral part of these consolidated condensed
interim financial statements. The Report of Independent Registered Public
Accounting Firm on these consolidated condensed interim financial statements is
issued as a separate document.

                                       3





CONSOLIDATED CONDENSED INTERIM CASH FLOW STATEMENT



                                                                           THREE-MONTH PERIOD ENDED MARCH 31,
                                                                        ----------------------------------------
(all amounts in USD thousands)                                                  2005                 2004
                                                                        --------------------- ------------------
                                                                                       (UNAUDITED)
CASH FLOWS FROM OPERATING ACTIVITIES
                                                                                                        
Income for the period                                                               279,970               47,603
Adjustments for:
   Depreciation and amortization                                                     51,977               53,824
   Income tax accruals less payments                                                 37,478              (10,320)
   Equity in (earnings) losses of associated companies                              (30,163)                 461
   Interest accruals less payments, net                                               2,344                1,551
Changes in provisions                                                                (4,285)              (1,068)
Proceeding from Fintecna arbitration award net of BHP
settlements (See Note 8 (i))                                                         66,594              (55,090)
Change in working capital                                                          (209,878)            (119,891)
Currency translation adjustment and others                                          (11,344)              (6,579)
                                                                        --------------------- ------------------
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES                                 182,693              (89,509)
                                                                        --------------------- ------------------
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures                                                                (47,316)             (39,912)
Capital increase and acquisitions of subsidiaries and
associated companies                                                                    (38)                 191
Cost of disposition of property, plant and equipment and
intangible assets                                                                     1,442                6,519
Dividends and distributions received from associated companies                       19,520                    -
Changes in restricted bank deposits                                                 (27,680)                   -
Reimbursement from trust funds                                                      119,666                    -
                                                                        --------------------- ------------------
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES                                  65,594              (33,202)
                                                                        --------------------- ------------------
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from borrowings                                                            398,269              132,066
Repayments of borrowings                                                           (516,422)             (41,667)
                                                                        --------------------- ------------------
NET CASH (USED IN)  PROVIDED BY FINANCING ACTIVITIES                               (118,153)              90,399
                                                                        --------------------- ------------------
INCREASE / (DECREASE) IN CASH AND CASH EQUIVALENTS                                  130,134              (32,312)

MOVEMENT IN CASH AND CASH EQUIVALENTS
At beginning of the period                                                          293,824              238,030
Effect of exchange rate changes                                                        (298)                (378)
Increase / (decrease) in cash and cash equivalents                                  130,134              (32,312)
                                                                        --------------------- ------------------
AT MARCH 31,                                                                        423,660              205,340
                                                                        ===================== ==================

CASH AND CASH EQUIVALENTS                                                                AT MARCH 31,
                                                                        ----------------------------------------
                                                                                    2005                2004
                                                                        ----------------------------------------
Cash and bank deposits                                                              477,106              220,968
Bank overdrafts                                                                     (12,266)             (15,628)
Restricted bank deposits                                                            (41,180)                   -
                                                                        ----------------------------------------
                                                                                    423,660              205,340
                                                                        ========================================


The  accompanying  notes are an integral  part of these  consolidated  condensed
interim  financial  statements.  The  Report of  Independent  Registered  Public
Accounting Firm on these consolidated  condensed interim financial statements is
issued as a separate document.


                                       4




NOTES TO THE CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS


INDEX TO THE NOTES TO THE CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS


1    Basis of presentation

2    Impact of New Accounting Pronouncements: International Financial Reporting
     Standards

3    Segment information

4    Cost of sales

5    Selling, general and administrative expenses

6    Financial income (expenses), net

7    Property, plant and equipment and Intangible assets, net

8    Contingencies, commitments and restrictions to the distribution of profits

9    Business acquisitions, incorporation of subsidiaries and other significant
     events

10   Related party disclosures

                                       5





NOTES TO THE CONSOLIDATED  CONDENSED INTERIM FINANCIAL  STATEMENTS (In the notes
all amounts are shown in USD thousands, unless otherwise stated)

1    BASIS OF PRESENTATION

Tenaris S.A. (the "Company" or  "Tenaris"),  a Luxembourg  corporation  (societe
anonyme  holding),  was incorporated on December 17, 2001 to hold investments in
steel pipe manufacturing and distributing  companies.  The Company holds, either
directly or indirectly, controlling interests in various subsidiaries.

These consolidated  condensed interim financial statements have been prepared in
accordance with IAS 34, "Interim Financial  Reporting".  The accounting policies
used  in  the  preparation  of  the  consolidated  condensed  interim  financial
statements  are  consistent  with  those  used  in  the  consolidated  financial
statements  for the  year  ended  December  31,  2004,  except  for the  changes
explained in Note 2. These consolidated  condensed interim financial  statements
should be read in  conjunction  with the  consolidated  financial  statements at
December 31, 2004.

Certain  comparative  amounts  have been  reclassified  to conform to changes in
presentation in the current period.

The preparation of consolidated  condensed interim financial statements requires
management  to make  estimates  and  assumptions  that might affect the reported
amounts of assets and  liabilities  and the disclosure of contingent  assets and
liabilities at the balance sheet dates, and the reported amounts of revenues and
expenses  during the  reporting  periods.  Actual  results may differ from these
estimates.

Material intercompany  transactions and balances between Tenaris's  subsidiaries
have been eliminated in  consolidation.  However,  the fact that the measurement
currency of some subsidiaries is their respective local currency, generates some
financial  gains  (losses)  arising  from  intercompany  transactions,  that are
included in the consolidated  condensed interim income statement under Financial
income (expenses), net.

These  consolidated  condensed  interim  financial  statements  were approved by
Tenaris's board of directors on May 2, 2005.

2    IMPACT OF NEW ACCOUNTING PRONOUNCEMENTS: INTERNATIONAL FINANCIAL REPORTING
     STANDARDS

In  December  2003,  as a part of the IASB's  project  to improve  International
Financial Reporting Standards,  the IASB released revisions to certain standards
including:  IAS 1,  "Presentation of Financial  Statements";  IAS 16, "Property,
Plant and Equipment";  IAS 24, "Related Party Disclosures" and IAS 33, "Earnings
per Share".  The revised  standards must be applied for annual periods beginning
on or after January 1, 2005. In addition,  during 2004  International  Financial
Reporting  Standard  (IFRS) 3,  "Business  Combinations"  was  issued.  The main
impacts on the Tenaris consolidated financial statements are:

(a) Presentation of minority interests
IAS 1 (revised) requires disclosure, on the face of the income statement, of the
entity's income or loss for the period and the allocation of that amount between
"income  or  loss  attributable  to  minority  interest"  and  "income  or  loss
attributable to equity holders of the parent". Earnings per share continue to be
calculated  on the net  income  attributable  solely to the  equity  holders  of
Tenaris.  Also, as from January 1, 2005 minority interests is included as equity
in the consolidated  balance sheet and not longer shown as a separate  category.
The effect of this change  increased the Company's  equity at January 1, 2005 by
USD165.3 million.

(b) IFRS 3 - goodwill and negative goodwill
Until December 31, 2004 goodwill was amortized on a straight line basis over its
estimated useful life, not to exceed 15 years, and assessed for an indication of
impairment  at each  balance  sheet  date.  Under  IFRS 3,  the  Company  ceased
amortization from January 1, 2005;  accumulated  amortization as at December 31,
2004 has been offset against the cost of goodwill. For years ending December 31,
2005 onwards,  goodwill have to be tested  annually for  impairment,  as well as
when there are  indicators  of  impairment.  Amortization  included in the three
months period ended March 31, 2004 amounted to USD2.2 million.

Also, IFRS 3 requires  accumulated  negative goodwill at December 31, 2004 to be
derecognized with a corresponding adjustment to retained earnings. The effect of
this change is an increase in the  opening  balance of the  Company's  equity at
January 1, 2005 of USD110.8 million.  Amortization  included in the three months
period ended March 31, 2004 amounted to USD2.2 million.

                                       6




2    IMPACT OF NEW ACCOUNTING PRONOUNCEMENTS: INTERNATIONAL FINANCIAL REPORTING
     STANDARDS (CONT'D)

(c) IAS 39 Financial instruments: recognition and measurement
In accordance  with the transition  provisions of IAS 39 (revised),  the Company
designated   previously  recognized  available  for  sale  financial  assets  as
financial assets at fair value through profit or loss. Accordingly,  the Company
restated  the  financial  asset  using the new  designation  in the  comparative
financial statements.

Adoption  of new or  revised  standards  has been  made in  accordance  with the
respective transition provisions.

3    SEGMENT INFORMATION

     PRIMARY REPORTING FORMAT: BUSINESS SEGMENTS




                              --------------------------------------------------------------------------------
                                              WELDED & OTHER
                                                 METALLIC
                                 SEAMLESS        PRODUCTS          ENERGY           OTHER            TOTAL
                              --------------------------------------------------------------------------------
    THREE-MONTH PERIOD ENDED                                     (UNAUDITED)
    MARCH 31, 2005
                                                                                          
    Net sales                      1,105,252        160,434          143,972         43,269        1,452,927
    Cost of sales                   (601,517)      (101,631)        (137,484)       (24,496)        (865,128)
                              --------------------------------------------------------------------------------
    Gross profit                     503,735         58,803            6,488         18,773          587,799

    Depreciation and
    amortization                      44,363          3,622              799          3,193           51,977

    THREE-MONTH PERIOD ENDED
    MARCH 31, 2004
    Net sales                        674,266         66,388          103,923         14,769          859,346
    Cost of sales                   (456,709)       (53,610)        (100,569)        (9,569)        (620,457)
                              --------------------------------------------------------------------------------
    Gross profit                     217,557         12,778            3,354          5,200          238,889

    Depreciation and
    amortization                      48,911          3,010              959            944           53,824

    Tenaris's main business segment is the manufacture of seamless steel pipes.


    SECONDARY REPORTING FORMAT: GEOGRAPHICAL SEGMENTS





                              ------------------------------------------------------------------------------------
                                 SOUTH                                MIDDLE EAST    FAR EAST &
                                AMERICA      EUROPE    NORTH AMERICA    & AFRICA      OCEANIA          TOTAL
                              ------------------------------------------------------------------------------------
    THREE-MONTH PERIOD ENDED                                      (UNAUDITED)
    MARCH 31, 2005
                                                                                        
    Net sales                     354,590      405,743     414,058        146,623      131,913      1,452,927
    Depreciation and
    amortization                   21,083       17,781      11,477             11        1,625         51,977

    THREE-MONTH PERIOD ENDED
    MARCH 31, 2004
    Net sales                     164,519      307,460     198,486         92,008       96,873        859,346
    Depreciation and
    amortization                   26,432       15,893       9,879             10        1,610         53,824


      Allocation of net sales is based on the customers' location. Allocation of
      depreciation and amortization is based on the related assets' location.

      Although Tenaris's business is managed on a worldwide basis, the companies
      forming  part of  Tenaris  operate  in the five  main  geographical  areas
      detailed above.

                                       7





4    COST OF SALES



                                                                     THREE-MONTH PERIOD ENDED
                                                                             MARCH 31,
                                                                  --------------------------------
                                                                        2005            2004
                                                                  ----------------- --------------
                                                                            (UNAUDITED)
                                                                                        
         INVENTORIES AT THE BEGINNING OF THE PERIOD                      1,269,470        831,879

         PLUS: CHARGES OF THE PERIOD
                Raw  materials,  energy,  consumables  and other
                movements                                                  706,519        453,656
                Services and fees                                           73,495         62,613
                Labor cost                                                  99,060         87,352
                Depreciation of property, plant and equipment               44,812         46,302
                Amortization of intangible assets                            1,711          2,301
                Maintenance expenses                                        23,048         19,180
                Provisions for contingencies                                 1,200              -
                Allowance for obsolescence                                   1,264         (1,123)
                Taxes                                                          975            655
                Others                                                       4,282          3,264
                                                                  ----------------- --------------
                                                                           956,366        674,200

         LESS: INVENTORIES AT THE END OF THE PERIOD                     (1,360,708)      (885,622)
                                                                  ----------------- --------------
                                                                           865,128        620,457
                                                                  ----------------- --------------


5    SELLING, GENERAL AND ADMINISTRATIVE EXPENSES





                                                                      THREE-MONTH PERIOD ENDED
                                                                             MARCH 31,
                                                                   -------------------------------
                                                                        2005            2004
                                                                   ---------------- --------------
                                                                            (UNAUDITED)
                                                                                        
          Services and fees                                                31,487          25,266
          Labor cost                                                       46,035          35,449
          Depreciation of property, plant and equipment                     2,479           2,544
          Amortization of intangible assets                                 2,975           2,677
          Commissions, freights and other selling expenses                 68,024          49,459
          Provisions for contingencies                                      1,878           1,275
          Allowances for doubtful accounts                                  5,314           3,721
          Taxes                                                            16,822          11,635
          Others                                                           10,069           7,792
                                                                   ---------------- --------------
                                                                          185,083         139,818
                                                                   ---------------- --------------


6    FINANCIAL INCOME (EXPENSES), NET



                                                                      THREE-MONTH PERIOD ENDED
                                                                             MARCH 31,
                                                                   -------------------------------
                                                                        2005            2004
                                                                   ---------------- --------------
                                                                            (UNAUDITED)
                                                                                         
         Interest expense                                                (12,442)          (8,693)
         Interest income                                                   2,959            3,095
         Net foreign exchange  transaction  losses and changes in
         fair value of derivative instruments (*)                        (33,879)         (15,279)
         Miscellaneous                                                     1,555            5,439
                                                                   ---------------- --------------
                                                                         (41,807)         (15,438)
                                                                   ---------------- --------------


(*)  Includes a loss of USD12.4  million  originated by Materiales  Siderurgicos
     Matesi S.A.'s debt with Talta and Sidor.


                                       8




7    PROPERTY, PLANT AND EQUIPMENT AND INTANGIBLE ASSETS, NET




                                                              NET PROPERTY,        NET INTANGIBLE
                                                           PLANT AND EQUIPMENT         ASSETS
                                                           --------------------  ------------------
                                                               (UNAUDITED)          (UNAUDITED)
      THREE-MONTH PERIOD ENDED MARCH 31, 2005
                                                                                          
      Opening net book amount                                       2,164,601              49,211
      Effect of adopting IFRS 3 (see Note 2 (b))                            -             110,775
      Translation differences                                         (43,788)               (624)
      Transfers                                                             3                  (3)
      Additions                                                        44,228               3,088
      Disposals                                                        (1,414)                (28)
      Depreciation/ Amortization charge                               (47,291)             (4,686)
                                                           --------------------  ------------------
      AT MARCH 31, 2005                                             2,116,339             157,733
                                                           --------------------  ------------------



8    CONTINGENCIES, COMMITMENTS AND RESTRICTIONS TO THE DISTRIBUTION OF PROFITS

  This  note  should  be read  in  conjunction  with  Note  25  included  in the
  consolidated  financial  statements  for the year ended December 31, 2004. The
  significant changes or events since the annual report are the followings:

  (i)    ARBITRATION PROCEEDING AGAINST FINTECNA

  On  December  28,  2004 the  arbitral  tribunal  rendered a final award in the
  arbitration  proceeding  against  Fintecna  S.p.A.  ("Fintecna"),  an  Italian
  state-owned  entity and  successor to ILVA S.p.A,  the former owner of Dalmine
  S.p.A.  ("Dalmine") in which Tenaris sought  indemnification from Fintecna for
  amounts  paid or  payable by Dalmine  to the  consortium  led by BHP  Billiton
  Petroleum  Ltd.  ("BHP")  regarding  the  failure of an  underwater  pipeline,
  manufactured and sold prior to the privatization of Dalmine. According to this
  final award,  Fintecna paid a total amount of EUR93.8  million  (approximately
  USD124.9  million) on March 15, 2005.  In addition,  on March 29, 2005 Tenaris
  prepaid  to BHP the  final  instalment  of  GBP30.4  million  plus  interests.
  Consequently,  both BHP settlement  agreement and the arbitration  proceedings
  have been definitively concluded.

  (II)   CONSORCIO SIDERURGIA AMAZONIA, LTD. ("AMAZONIA")

  On February 3, 2005 Ylopa Servicos de Consultadoria Lda.  ("Ylopa")  exercised
  its option to convert  convertible  debt  instruments it held in Amazonia into
  common stock. As a result,  Tenaris's participation in Amazonia increased from
  14.5% to 21.2%,  thereby increasing its indirect  participation in Siderurgica
  del Orinoco C.A.  ("Sidor")  from 8.7% to 12.6%.  All of  Amazonia's  existing
  shares and shares of Sidor  continue to be pledged  until the third quarter of
  2005.

  (III) TAX SITUATION: APPLICATION OF INFLATION ADJUSTMENT PROCEDURES

  As explained in Note 25 (iii) of the consolidated financial statements for the
  year  ended  December  31,  2004,  on  February  11,  2005  Siderca   S.A.I.C.
  ("Siderca")  obtained  the benefits of a  promotional  regime  established  by
  Argentine Law 25.924.  For this reason,  Siderca withdrew its legal proceeding
  related to the application of the inflation adjustment procedure in the income
  tax returns for the year ended December 31, 2002. On February 21, 2005 Siderca
  paid  ARP69.4  million  (USD23.8  million).  No  charges  against  the  income
  statement  arose from this  payment,  as  Tenaris  had  previously  recorded a
  provision for this matter.

  (IV)   COMMITMENTS

(a)      On March 15, 2005  Complejo  Siderurgico  de Guayana C.A.  ("Comsigua")
         prepaid  100%  of  the  amount  owed  to  the   International   Finance
         Corporation,  or IFC, for approximately  USD42.5 million,  related with
         project financing loans. Tenaris has applied to the IFC for the release
         from its proportional guarantee of such project loan.

                                       9




8    CONTINGENCIES,  COMMITMENTS AND RESTRICTIONS TO THE DISTRIBUTION OF PROFITS
     (CONT'D)

(IV)     COMMITMENTS (CONT'D)

(b)      On March 3, 2005 Tenaris  Financial  Services S.A., a subsidiary of the
         Company,  made a deposit of USD25.0  million at Deutsche Bank AG London
         Branch  as  a  collateral  for  a  financial  transaction  between  the
         mentioned bank and another Tenaris subsidiary, generating a restriction
         on the availability of such funds. Consequently,  total restricted cash
         at March 31, 2005 amounts to USD41.2 million.

(V)      RESTRICTIONS TO THE DISTRIBUTION OF PROFITS

Under  Luxembourg  law,  at least 5% of the net  income per year  calculated  in
accordance with Luxembourg law and regulations must be allocated to the creation
of a reserve  until such  reserve has  reached to an amount  equal to 10% of the
share capital. At March 31, 2005 the Company has created this reserve in full.


Shareholders'  equity at March 31,  2005 under  Luxembourg  law and  regulations
comprises the following captions:

  Share capital                                                  1,180,537
  Legal reserve                                                    118,054
  Share premium                                                    609,733
  Other distributable reserve                                           82
  Retained  earnings  including  net income for the three month
  period ended March 31, 2005                                      731,808
                                                                -----------
  Total shareholders equity according to Luxembourg law          2,640,214
                                                                ===========

Tenaris  may pay  dividends  to the extent  that it has  distributable  retained
earnings and distributable  reserve calculated in accordance with Luxembourg law
and regulations.

At March 31, 2005, the distributable  reserve,  including retained earnings,  of
Tenaris under Luxembourg Law totalled USD731.9 million, as detailed below.

  Distributable  reserve at December 31, 2004 under  Luxembourg   536,541
  law
  Dividends and distributions received                            132,776
  Other income and expenses  for the  three-month  period ended
  March 31, 2005                                                   62,573
                                                                 ---------
  Distributable reserve at March 31, 2005 under Luxembourg law    731,890
                                                                 =========


9    BUSINESS ACQUISITIONS, INCORPORATION OF SUBSIDIARIES AND OTHER SIGNIFICANT
     EVENTS

The financial  resources in trust funds at December 31, 2004 (USD119.7 million),
were contributed to two wholly-owned  Chilean  subsidiaries  (Inversiones  Berna
S.A. and Inversiones Lucerna S.A.) on January 1, 2005.


                                       10





10     RELATED PARTY DISCLOSURES

The Company is controlled by I.I.I. Industrial Investments Inc. which owns 60.2%
of Tenaris's  shares and voting rights.  The remaining 39.8% is publicly traded.
The  ultimate  controlling  entity of the  Company is Rocca & Partners  S.A.,  a
British Virgin Islands corporation.

The following transactions were carried out with related parties:




      THREE-MONTH PERIOD ENDED MARCH 31, 2005
                                                          ASSOCIATED        OTHER          TOTAL
      TRANSACTIONS



       (A) SALES OF GOODS AND SERVICES
                                                                                  
              Sales of goods                                       181         40,686          40,867
              Sales of services                                    235          2,854           3,089
                                                        --------------- -------------- ---------------
                                                                   416         43,540          43,956
                                                        =============== ============== ===============
       (B) PURCHASES OF GOODS AND SERVICES
              Purchases of goods                                    27         17,649          17,676
              Purchases of services                                 40         16,239          16,279
                                                        --------------- -------------- ---------------
                                                                    67         33,888          33,955
                                                        =============== ============== ===============
      THREE-MONTH PERIOD ENDED MARCH 31, 2004
                                                          ASSOCIATED        OTHER          TOTAL
      TRANSACTIONS

       (A) SALES OF GOODS AND SERVICES
              Sales of goods                                       337         12,047          12,384
              Sales of services                                  1,477          2,803           4,280
                                                        --------------- -------------- ---------------
                                                                 1,814         14,850          16,664
                                                        =============== ============== ===============

       (B) PURCHASES OF GOODS AND SERVICES

              Purchases of goods                                     -         11,205          11,205
              Purchases of services                                  -          8,340           8,340
                                                        --------------- -------------- ---------------
                                                                     -         19,545          19,545
                                                        =============== ============== ===============
      AT MARCH  31, 2005
                                                          ASSOCIATED        OTHER          TOTAL
                                                        --------------- -------------- ---------------
      PERIOD-END BALANCES

       (A) ARISING FROM SALES/PURCHASES OF
       GOODS/SERVICES
              Receivables from related parties                   2,032         50,517          52,549
              Payables to related parties                           (9)       (18,568)        (18,577)
                                                        --------------- -------------- ---------------
                                                                 2,023         31,949          33,972
                                                        =============== ============== ===============
       (B) CASH AND CASH EQUIVALENTS
              Time deposits                                          -              6               6

       (C) OTHER BALANCES
              Receivables                                        2,080            107           2,187

       (D) FINANCIAL DEBT
            Borrowings and overdrafts (1)                            -        (52,363)        (52,363)


(1)  Includes  borrowings  from Sidor to Matesi,  Materiales  Siderurgicos  S.A.
(USD52,363 at March 31, 2005)

                                       11





10       RELATED PARTY DISCLOSURES  (CONT'D.)




      AT DECEMBER 31, 2004
                                                      ASSOCIATED        OTHER           TOTAL
                                                     -------------- --------------- --------------
      PERIOD-END BALANCES

       (A) ARISING FROM SALES/PURCHASES OF
       GOODS/SERVICES
                                                                                     
              Receivables from related parties               3,396          49,267         52,663
              Payables to related parties                      (49)        (17,352)       (17,401)
                                                     -------------- --------------- --------------
                                                             3,347          31,915         35,262
                                                     ============== ==============  ==============

       (B) CASH AND CASH EQUIVALENTS
              Time deposits                                      -               6              6

       (C) OTHER BALANCES
              Trust fund                                         -         119,666        119,666
              Convertible debt instruments - Ylopa         121,955               -        121,955

      (D) FINANCIAL DEBT

            Borrowings and overdrafts (1)                        -         (56,906)       (56,906)


(1)  Includes  borrowings  from Sidor to Matesi,  Materiales  Siderurgicos  S.A.
(USD51,457 at December 31, 2004)








                                                Carlos Condorelli
                                            Chief Financial Officer



                                       12