UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 20, 2003 MARATHON OIL CORPORATION (Exact name of registrant as specified in its charter) Delaware 1-5153 25-0996816 (State or other jurisdiction (Commission File Number) (IRS Employer of incorporation) Identification No.) 5555 San Felipe Road, Houston, Texas 77056-2723 (Address of principal executive offices) (Zip Code) Registrant's telephone number, including area code: (713) 629-6600 ------------------------------ 1 Item 5. Other Events. On June 20, 2003, Marathon Oil Corporation (Marathon) issued a press release announcing it has, through its subsidiaries, signed a Dissolution and Distribution Agreement with Kinder Morgan Energy Partners, L.P. to dissolve MKM Partners L.P. (and a related company, MKM Holdings LLC), which has oil and gas production operations in the Permian Basin of Texas (Release). For additional information, please refer to the Release attached to this Report as Exhibit 99.1, which Release (other than the quotation from Marathon's President and CEO and the contact information) is incorporated herein by reference. Item 7. Financial Statements and Exhibits. (c) Exhibits. 99.1 Press Release dated June 20, 2003, issued by Marathon Oil Corporation. 2 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 hereunto duly authorized. MARATHON OIL CORPORATION Date: June 20, 2003 By: /s/ A.G. Adkins ----------------------------------------- A.G. Adkins Vice President-Accounting and Controller 3 EXHIBIT INDEX Number Exhibit 99.1 Press Release dated June 20, 2003, issued by Marathon Oil Corporation.