Marathon Extends Share Buyback

Marathon Oil Corp.'s Board of Directors has authorized the extension of Marathon's share repurchase program by an additional $500 million. Since January 30, 2006, the Board has authorized the repurchase of up to $3.0 billion of Marathon's common stock.

Marathon anticipates completing the previously announced $2.5 billion share repurchase program by the end of the second quarter of 2007, resulting in the repurchase of more than 28 million shares. The additional $500 million in share repurchases is anticipated to be completed during the balance of 2007. This program may be changed based on the Company's financial condition or changes in market conditions and is subject to termination prior to completion.

Any purchases under the program may be in either open market transactions, including block purchases, or in privately negotiated transactions. The repurchase program does not include specific price targets or timetables. Marathon will use cash on hand, cash generated from operations, or cash from available borrowing to acquire shares. At the end of the first quarter of 2007, Marathon had cash on hand of $2.3 billion. Shares of stock repurchased under the program will be held as treasury shares.