Oil and Gas Companies

 Biggest US Oil Companies

ExxonMobil is an American based company that is directly descended from John D. Rockefeller's Standard Oil. Exxon and Mobil merged in 1999 to create ExxonMobil which is centered in Irving, Texas. Ranked at either No. 1 or No. 2 for the past five years, it is one of the largest publicly traded companies by market capitalization. When evaluated for market revenue, it is 2nd in the world making it a true giant in the energy industry overall. With 37 oil refineries and over 83,000 employees, ExxonMobil is the largest refiner currently in operation. It sells its products under the brands of Exxon,