ExxonMobil is the energy company formed in 1999 from Exxon and Mobil that became one of the world’s largest listed firms by market capitalization.
Exxon and Mobil were both descendants of John D. Rockefeller’s Standard Oil, which was broken up by the United States government in 1911. Exxon was the later name of Standard Oil of New Jersey, while Mobil developed from Standard Oil of New York.
The two companies merged in 1999, creating ExxonMobil. The combined business operates across oil and gas exploration, production, refining, chemicals, and energy-related technologies. Its upstream and downstream activities give it exposure to multiple parts of the petroleum industry.
ExxonMobil is often confused with Exxon Valdez, the tanker involved in the 1989 Alaskan oil spill. Exxon Valdez was operated by Exxon Shipping Company, a subsidiary at the time; the ship was later renamed and sold. The corporation itself is headquartered in Spring, Texas.