ExxonMobil Corporation is an American multinational oil and gas corporation headquartered in Irving, Texas. Formed in 1999 by virtue of a merger between Exxon and Mobil, the company is vertically integrated into the oil and gas industry. It has interests in crude oil and natural gas while also refining petroleum products. It has a chemical segment that sells petrochemicals.
ExxonMobil frequently features as one of the world's largest companies by revenue and market capitalization. It has placed as high as number six in recent Fortune 500 rankings. It is commonly regarded as the largest Western-based member of the global Big Oil companies in both production and market value. The company retains significant crude oil reserves and is the second largest oil refiner in the world.