Marathon Petroleum Corporation is an American petroleum refining, marketing, and transportation company headquartered in Findlay, Ohio. The company was a wholly owned subsidiary of Marathon Oil until a corporate spin-off in 2011.

Amoco is a brand of fuel stations operating in the United States and owned by British conglomerate BP since 1998. The Amoco Corporation was an American chemical and oil company, founded by Standard Oil Company in 1889 around a refinery in Whiting, Indiana, and was officially the Standard Oil Company of Indiana until 1985. Originally part of the Standard Oil Company trust, it focused on producing gasoline for the new automobile market. In 1911, as part of the break-up of the Standard Oil trust, it became an independent corporation. Incorporated in Indiana, it was headquartered in Chicago, and formally adopted the name Amoco in 1985. Although the Amoco Corporation merged in 1998 into BP Amoco, the Amoco name was resurrected in 2017 as a brand that service station owners could choose to use when they purchased supplies from BP in selected areas of the United States.