X0303 4 2010-01-04 0 0000101778 MARATHON OIL CORP MRO 0001237640 LADER PHILIP C/O MARATHON OIL CORPORATION 5555 SAN FELIPE ROAD HOUSTON TX 77056 1 0 0 0 Marathon Oil Corporation Common Stock 2010-01-04 4 A 0 4671.442 32.11 A 39767.1027 D Annual Non-Retainer Common Stock Award granted under Marathon Oil Corporation 2007 Incentive Compensation Plan. The annual non-retainer stock-based compensation represented by these common stock units are credited to an unfunded account and are payable in shares of common stock upon reporting person's retirement from the Board of Directors. Includes dividends of 1,090.011696 shares previously not reported pursuant to Rule 16a-11. R. J. Kolencik, Attorney-in-Fact for Philip Lader 2010-01-05