Exxon Mobil Corporation or ExxonMobil ( ) is a US corporation and a direct descendant of John D. Rockefeller's Standard Oil company. Formed on November 30, 1999, by the merger of Exxon and Mobil, ExxonMobil is the world's largest company by revenue, at $404.5 billion for the fiscal year of 2007. It is also the largest publicly held corporation by market capitalization, at $481.10 billion on February 27, 2008. . It is the largest of the six oil supermajors with daily production of 6.5m boe (barrels of oil equivalent) . ExxonMobil ranks first in the world in proven oil and gas reserves among corporate oil producers , though it is still eclipsed by several of the largest state petroleum producers. Exxon has been the subject of criticism for its business practices and environmental record.
