Marathon Oil Corporation was an American company engaged in hydrocarbon exploration. In November 2024, it was acquired by ConocoPhillips. Marathon was founded in Lima, Ohio as the Ohio Oil Company. In 1899, the company was acquired by the Standard Oil Company. After the antitrust case against Jersey Standard in 1911 and subsequent breakup of its holdings, Ohio Oil once again became an independent company. In 1930, Ohio Oil acquired the Transcontinental Oil Company, which operated the "Marathon" brand of retail gasoline stations. Ohio Oil continued to use the Marathon brand, and in 1962, Ohio changed its name to the Marathon Oil Company. In January 1982, Marathon was acquired by U.S. Steel. After the acquisition, the USX Corporation was created to act as the parent of U.S. Steel and Marathon Oil, which operated as divisions. In 2001, USX spun off Marathon under the name Marathon Oil Corporation. In 2011, Marathon Oil spun off its downstream operations as Marathon Petroleum. As of December 31, 2020, the company had 972 million barrels of oil equivalent of estimated proven reserves, of which 86% was in the United States and 14% was in Equatorial Guinea. Wikipedia