Ownership Submission
FORM 3
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  KRAJECIK CATHERINE LEE
2. Date of Event Requiring Statement (Month/Day/Year)
12/01/2015
3. Issuer Name and Ticker or Trading Symbol
MARATHON OIL CORP [MRO]
(Last)
(First)
(Middle)
C/O MARATHON OIL CORPORATION, 5555 SAN FELIPE ST
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Vice President (See Remarks)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

HOUSTON, TX 77056
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Marathon Oil Corporation Common Stock 23,321
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(Month/Day/Year)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (Right to Buy) 05/28/2011 05/28/2018 Common Stock 3,530 $ 32.06 D  
Employee Stock Option (Right to Buy) 05/27/2012 05/27/2019 Common Stock 4,315 $ 18.32 D  
Employee Stock Option (Right to Buy) 05/26/2013 05/26/2020 Common Stock 6,950 $ 19.03 D  
Employee Stock Option (Right to Buy) 05/26/2013 05/26/2020 Common Stock 2,071 $ 19.03 D  
Employee Stock Option (Right to Buy) 05/25/2014 05/25/2021 Common Stock 10,065 $ 33.06 D  
Employee Stock Option (Right to Buy) 08/31/2014 08/31/2021 Common Stock 7,392 $ 26.92 D  
Employee Stock Option (Right to Buy) 02/28/2015 02/28/2022 Common Stock 5,491 $ 35.06 D  
Employee Stock Option (Right to Buy) 08/31/2015 08/31/2022 Common Stock 7,304 $ 27.82 D  
Employee Stock Option (Right to Buy) 04/08/2014(1) 04/08/2023 Common Stock 6,467 $ 32.84 D  
Employee Stock Option (Right to Buy) 10/07/2014(2) 10/07/2023 Common Stock 6,633 $ 34.72 D  
Employee Stock Option (Right to Buy) 04/07/2015(3) 04/07/2024 Common Stock 19,544 $ 34.9 D  
Employee Stock Option (Right to Buy) 02/25/2016(4) 02/25/2025 Common Stock 17,575 $ 29.06 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
KRAJECIK CATHERINE LEE
C/O MARATHON OIL CORPORATION
5555 SAN FELIPE ST
HOUSTON, TX 77056
      Vice President (See Remarks)  

Signatures

Elisa D. Watts, Attorney-in-Fact for Catherine L. Krajicek 12/08/2015
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Vests in cumulative annual installments of 2,155, 2,156 and 2,156 shares on April 8, 2014, 2015 and 2016, respectively.
(2) Vests in cumulative annual installments of 2,211, 2,211 and 2,211 shares on October 7, 2014, 2015 and 2016, respectively.
(3) Vests in cumulative annual installments of 6,514, 6,515 and 6,515 shares on April 7, 2015, 2016 and 2017, respectively.
(4) Vests in cumulative annual installments of 5,858, 5,858 and 5,859 shares on February 25, 2016, 2017 and 2018, respectively.
 
Remarks:
Vice President-Corporate Development and Strategy

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