MARATHON OIL CORPORATION
ANNOUNCES TWO-FOR-ONE STOCK SPLIT

Two-for-One Common Stock

HOUSTON, April 25, 2007 / PRNewswire-FirstCall via COMTEX News Network/ -- Marathon Oil Corporation (NYSE: MRO) announced today that the Company's Board of Directors has declared a two-for-one stock split of Marathon's common stock. The stock split will be effected in the form of a stock dividend distributed on June 18, 2007, to stockholders of record at the close of business on May 23, 2007. Stockholders will receive one additional share of Marathon Oil Corporation common stock for each share of common stock held as of the close of business on the record date.

In a separate action today, Marathon's Board declared an eight cent or 20 percent per share increase in the first quarter dividend payable on Marathon Oil Corporation common stock, resulting in a new quarterly dividend rate of 48 cents per share. The first quarter dividend is payable June 11, 2007, to stockholders of record at the close of business on May 16, 2007. Since this quarterly dividend will be paid prior to the distribution date applicable to the stock split, the dividend declared today applies to pre-split shares only. On a post-split basis, the dividend would be 24 cents per share.

"Our continued emphasis on aligning Marathon's values with the sound execution of our business strategy has rewarded our shareholders with a three- year total shareholder return through December 2006 of 212 percent," said Clarence P. Cazalot, Jr., Marathon president and CEO. "This stock split and dividend increase reflects our strong performance and we appreciate the continued confidence of our Board in our ability to continue delivering long- term sustainable value growth for our shareholders."

Since July 2003, Marathon has increased the quarterly dividend five times resulting in a 109 percent increase during this period. Additionally, since January 30, 2006, the Company's Board of Directors has authorized the repurchase of up to $2.5 billion of Marathon's common stock. To date, the Company has repurchased approximately $2.2 billion in Marathon shares.

This release contains forward-looking statements with respect to the common stock repurchase program. The common stock repurchase program could be affected by changes in, prices of and demand for crude oil, natural gas and refined products, actions of competitors, disruptions or interruptions of the Company's production or refining operations due to unforeseen hazards such as weather conditions or acts of war or terrorist acts, and other operating and economic considerations. The foregoing factors (among others) could cause actual results to differ materially from those set forth in the forward- looking statements. In accordance with the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995, Marathon Oil Corporation has included in its Annual Report on Form 10-K for the year ended December 31, 2006, cautionary language identifying other important factors, though not necessarily all such factors, that could cause future outcomes to differ materially from those set forth in the forward-looking statements.

SOURCE Marathon Oil Corporation

media relations, Paul Weeditz, +1-713-296-3910, or Scott Scheffler, +1-713-296-4102, or investor relations, Ken Matheny, +1-713-296-4114, or Howard Thill, +1-713-296-4140, all of Marathon Oil Corporation