ExxonMobil is the world’s largest integrated oil company (ahead of BP and Royal Dutch Shell). In 1882, John D. Rockefeller founded the Standard Oil Company, the predecessor of the present ExxonMobil company. Exxon Mobil engages in oil and gas exploration, production, supply, transportation, and marketing worldwide. It has proved reserves of 13.6 billion barrels of oil equivalent. Exxon Mobil’s 40 refineries in 20 countries have a capacity of producing 6.4 million barrels per day. It has a current (2008) market value of close to $500 billion