The Exxon Mobil Corporation, or ExxonMobil, is an American oil and gas 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 $501.17 billion on April 18, 2008. Exxon's reserves were 72 billion oil-equivalent barrels at the end of 2007 and, at current rates of production, are expected to last over 14 years.While it is the largest of the six oil supermajorswith daily production of 4.18 million BOE (barrels of oil equivalent) in 2007 , this is only approximately 3% of world production and ExxonMobil's daily production is surpas...more >>sed by several of the largest state-owned petroleum companies. When ranked by oil and gas reserves it is 14th in the world with less than 1% of the total.Currently, the company ranks #1 in the world in net income, which was almost $40 billion last year.