Exxon Mobil Corporation or ExxonMobil (NYSE: XOM) is the largest publicly traded integrated oil and gas company in the world, formed on November 30, 1999, by the merger of Exxon and Mobil. It is the sixth-largest company in the world as ranked by the Forbes Global 2000 and the largest company in the world (by revenue) as ranked by the Fortune Global 500. It is the largest of the four oil "supermajors", which also includes BP (formerly British Petroleum), Shell and Total. It has the highest market value of any publicly traded company in the world, and in 2005 was the most profitable.

BP plc (LSE: BP, NYSE: BP, TYO: 5051 ), originally British Petroleum, is a British energy company with headquarters in London, one of four vertically integrated private sector oil, natural gas, and petrol (gasoline) "supermajors" in the world, along with Royal Dutch Shell, ExxonMobil and Total.