X0201 4/A 2004-01-26 2004-01-27 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 COMMON STOCK 2004-01-26 4 A 0 1167.202 34.27 A 6856.941 D Common stock units granted under Marathon Oil Corporation 2003 Incentive Compensation Plan. Common stock units vest upon reporting person's departure from the Board of Directors. Shares of common stock will be issued upon vesting of common stock units. This amended Form 4 is being filed to correct the number of shares beneficially owned to include dividends of 47.2021 shares allo cated to the reporting person's account previously not reported pursuant to Rule 16a-11. By: R. J. Kolencik, Attorney-in-Fact for Philip Lader 2004-02-13