ExxonMobil was created in 1999 by the merger of Exxon and Mobil.
ExxonMobil Corporation is an integrated energy company involved in crude-oil and natural-gas exploration, production, refining, chemicals, and fuels marketing. Its large reserves, refining operations, and global sales have made it a recurring member of lists of the world’s largest companies by market capitalization.
Exxon and Mobil were both descendants of Standard Oil, which was broken up by the United States government in 1911. Exxon was known as Standard Oil of New Jersey, while Mobil descended from Standard Oil of New York. Their merger was completed in 1999, reuniting two major branches of that earlier corporate family.
ExxonMobil is not the same company as Chevron, another major American oil producer. ExxonMobil’s integrated structure covers upstream, downstream, and chemical activities, although the balance of those businesses changes with energy prices and investment cycles.