Revenue: $236.8 billion
Market Value: $ 363.3 billion
Exxon Mobil was founded by John D. Rockefeller in 1882 (making it the oldest company on our list) and is headquartered in Irving, Texas.
The company engages in the exploration, development, and distribution of oil, gas, and petroleum products.
It operates through the following segments:

• Upstream, 
• Downstream, 
• Chemical.

The Upstream segment produces crude oil and natural gas.
The Downstream segment manufactures and trades petroleum products.
The Chemical segment offers petrochemicals.
The Company's projects include the Kearl project, Heidelberg project, the Point Thomson project, the Hadrian South project, the Lucius project, Azeri-Chirag-Gunashli field, the Barzan project, the Arkutun-Dagi project, and the Upper Zakum 750 project, among others.
The company employs over 75,000 people and (in 2015) had sales of over $236.81 billion and profits of over $16.15 billion.
Exxon Mobil currently has assets worth $336.76 billion.