X0304 4 2011-10-03 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 2011-10-03 4 A 0 1850.025 0.00 A 69323.162 D Non-Retainer Quarterly Director Stock Unit Award granted under Marathon Oil Corporation 2007 Incentive Compensation Plan. The quarterly 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 the reporting person's departure from the Board of Directors. Includes dividends of 412.5936 shares previously not reported pursuant to Rule 16a-11. Yvonne R. Kunetka, Attorney-in-Fact for Philip Lader 2011-10-05