Exxon Mobil Corporation is an American multinational oil and gas corporation and one of the world's largest publicly traded energy companies. Headquartered in Spring, Texas, ExxonMobil explores for, produces, refines, and markets crude oil, natural gas, and petroleum products, and manufactures petrochemicals. Formed in 1999 through the merger of Exxon and Mobil, the company traces its roots to John D. Rockefeller's Standard Oil.