ExxonMobil is the largest direct descendant of John D. Rockefeller's Standard Oil and was formed on November 30, 1999, by the merger of Exxon (formerly the Standard Oil Company of New Jersey) and Mobil (formerly the Standard Oil Company of New York). ExxonMobil's primary brands are Exxon, Mobil, Esso, and ExxonMobil Chemical. ExxonMobil is incorporated in New Jersey.
One of the world's largest companies by revenue, ExxonMobil from 1996 to 2017 varied from the first to sixth-largest publicly traded company by market capitalization. As of 2018, the company ranked second in the Fortune 500 rankings of the largest United States corporations by total revenue. Approximately 55.56% of the company's shares are held by institutions. As of March 2019, ExxonMobil's largest shareholders include The Vanguard Group (8.15%), BlackRock (6.61%), and State Street Corporation (4.83%).
With 37 oil refineries in 21 countries constituting a combined daily refining capacity of 6.3 million barrels (1,000,000 m3), ExxonMobil is the seventh-largest refiner in the world, a title that was also associated with Standard Oil since its incorporation in 1870. ExxonMobil is the largest non-government owned company in the energy industry and produces about 3% of the world's oil and about 2% of the world's energy.
ExxonMobil is organized functionally into a number of global operating divisions. These divisions are grouped into three categories for reference purposes, though the company also has several ancillary divisions, such as Coal & Minerals, which are stand alone. It also owns hundreds of smaller subsidiaries such as Imperial Oil Limited (69.6% ownership) in Canada, and SeaRiver Maritime, a petroleum shipping company.
-Upstream (oil exploration, extraction, shipping, and wholesale operations) based in Houston.
-Downstream (marketing, refining, and retail operations) based in Houston.
-Chemical division based in Houston.
According to en.wikipedia