- Anadarko Petroleum Corporation , United States
- Arbusto Energy , United States
- BHP Billiton , Australia
- BP , United Kingdom
- Cairn Energy , India
- Canadian Natural Resources , Canada
- Chevron Corporation , United States
- Citgo , Venezuela
- CNOOC Ltd. , China
- ConocoPhillips , United States
- Ecopetrol , Colombia
- Enbridge , Canada
- EnCana , Canada
- Eni , Italy
- Essar Oil , India
- Prize Petroleum CO.LTD. , India
- HOECL , India
- Jubiliant Empro , India
- JHON ENERGY , India
- Selan Exploration Tech.Ltd. , India
- Gujarat Oleo Chem Ltd. , India
- Geo Global Resources. , India
- Petronet LNG Limited , India
- Gujarat Gas Co. Ltd. , India
- Charottar Gas Sahkari Mandli. , India
- Piyush Petroleum Co. Ltd , India
- Pankaj Petroleum Co. Ltd , India
- ExxonMobil , United States
- Gujrat State Petroleum Corporation , India
- Gulf Oil , United States
- Halliburton , United States
- Husky Energy , Canada
- Imperial Oil , Canada
- Indian Oil Corporation , India
- Irving Oil , Canada
- Kerr-McGee , United States
- Koch Industries , United States
- The Louisiana Land & Exploration Company , United States
- LUKoil , Russia
- Marathon Oil Corporation , United States
- Maxol Group , Republic Of Ireland
- Norsk Hydro , Norway
- North Atlantic Petroleum , Canada
- OMV , Austria
- ONGC , India
- Oil India Limited, India
- Petróleos De Venezuela , Venezuela
- Petroleos Mexicanos , Mexico
- Petro-Canada , Canada
- Petro Peru , Peru
- Petrobras , Brazil
- PetroChina , China
- PetroKazakhstan , Canada
- Petronas , Malaysia
- Petrotrin , Trinidad And Tobago
- Pertamina , Indonesia
- Pogo Producing , United States
- Qatar Petroleum , Qatar
- Reliance Industries Limited , India
- Repsol YPF , Spain
- NNPC , Nigeria
- Royal Dutch Shell , Netherlands , United Kingdom
- Santos Limited , Australia
- Saudi Aramco , Saudi Arabia (the largest in the world)
- Shell Canada , Canada (subsidiary of Royal Dutch Shell)
- Shell Oil Company , United States (subsidiary of Royal Dutch Shell)
- Sinclair Oil , United States
- Sinopec , China
- Sonangol , Angola
- Sonatrach , Algeria
- SPC , Singapore
- Statoil , Norway
- Sunoco , United States
- Suncor Energy , Canada
- Syncrude , Canada
- Talisman Energy , Canada
- Teikoku Oil , Japan
- Todd Energy , New Zealand
- Total , France
- Tüpraş , Turkey
- Woodside Petroleum , Australia
- YPFB , Bolivia
- YUKOS , Russia
|
