The predecessors were Exxon and Mobil, which were merged and reorganized on November 30, 1999. The company is also the parent company of Exxon, Mobil and Esso's global subsidiaries. In addition, ExxonMobil is one of the world's largest oil companies along with Shell, BP and Total.

ExxonMobil is headquartered in Irvine, Texas, USA. The company sells products under the Exxon, Mobil, and Esso brands all over the world. It also has hundreds of subsidiaries such as Canada's Imperial Petroleum Co., Ltd. (69.6% ownership) and an oil transportation company called Haihe Maritime Company. The upstream sector dominates the company's cash flow, accounting for approximately 70% of the company's revenue. According to the company's 2006 group employee report, the company has a total of 82,000 employees worldwide, of which about 4,000 are in the Fairfax downstream headquarters and 27,000 are in its Houston upstream headquarters.

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