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Exxon Mobil Corporation, doing business as ExxonMobil, is an American multinational oil and gas corporation headquartered in Irving, Texas. It is the largest direct descendant of John D. Rockefeller's Standard Oil Company, and was formed on November 30, 1999 by the merger of Exxon and Mobil. ExxonMobil's primary brands are Exxon, Mobil, Esso, and ExxonMobil Chemical.