The world’s third largest integrated oil concern, behind Exxon Mobil and Royal Dutch Shell. The company, which was formed in 1998 from the merger of British Petroleum and the US giant Amoco (formerly Standard Oil of Indiana), then named BP Amoco until 2000 when it was renamed BP. BP has proved reserves of 18.3 billion barrels of oil equivalent, including large holdings in Alaska. BP is the largest oil and gas producer in the US and also a top refiner