Exxon and Mobil sign a US$73.7 billion agreement to merge, thus creating ExxonMobil, the world's largest company.

Exxon Mobil Corporation is an American multinational oil and gas corporation headquartered in Spring, Texas, a suburb of Houston. Founded as the largest direct successor of John D. Rockefeller's Standard Oil, the modern company was formed in 1999 following the merger of Exxon and Mobil. It is vertically integrated across the entire oil and gas industry, as well as within its chemicals division, which produces plastic, synthetic rubber, and other chemical products. As the largest U.S.-based oil and gas company, ExxonMobil is the seventh-largest company by revenue in the U.S. and 13th-largest in the world. It is the largest investor-owned oil company in the world. Approximately 55.56% of the company's shares are held by institutions, the largest of which as of 2019 were The Vanguard Group (8.15%), BlackRock (6.61%), and State Street Corporation (4.83%).

Mobil Oil Corporation, or just Mobil, is a petroleum brand owned and operated by American oil and gas corporation ExxonMobil, formerly known as Exxon, which took its name after it and Mobil merged in 1999.