- Abu Dhabi National Oil Company (ADNOC), United Arab Emirates
- Anadarko Petroleum Corporation, The Woodlands, Texas, United States of America; Independent
- ANCAP, Uruguay
- Apache Corporation, Houston, Texas, United States of America; Independent
- Arabian Gulf Oil Company (AGOCO), Libya
- Assam Oil Company Ltd. (ACL), India
- Atlantic Petroleum, Faroe Islands
- Bharat Petroleum Corporation Limited, India
- BG Group, United Kingdom
- BHP Billiton, Australia
- BP, United Kingdom
- Cairn Energy, United Kingdom
- Canadian Natural Resources, Canada
- Chevron Corporation, San Ramon, California, United States of America
- CNOOC, China
- ConocoPhillips, United States of America
- Cupet, Cuba
- Devon Energy, United States of America
- DNO International, Norway
- Dong Energy, Denmark
- Ecopetrol, Colombia
- Empresa Nacional del Petróleo (ENAP), Chile
- Enbridge, Canada
- EnCana, Canada
- ENSCO International, United States of America
- Eni, Italy
- Essar Oil, India
- Entreprise Tunisienne d'Activites Petroliere (ETAP), Tunisia
- ExxonMobil, United States of America
- Galp Energia, Portugal
- Gazprom Neft, Russia
- Greka Energy, United States of America
- Grupa LOTOS, Poland
- Gujarat State Petroleum Corporation, India
- HKN, Inc. United States of America
- Hess Corporation, United States of America
- Hindustan Petroleum Corporation Ltd, India
- Husky Energy, Canada
- IB Daiwa, Japan
- Imperial Oil, Canada
- INA – Industrija Nafte, Croatia
- Indian Oil Corporation, India
- Inpex, Japan
- Japan Energy, Japan
- Japan Petroleum Exploration Company Limited (JAPEX), Japan
- KazMunayGas, Kazakhstan
- Korea National Oil Corporation (KNOC), South Korea
- Koch Industries, United States of America
- Kuwait National Petroleum Company Kuwait.
- Kuwait Oil Company, Kuwait
- Kuwait Petroleum Corporation, Kuwait
- LUKoil, Russia
- Maersk Oil, Denmark
- Marathon Oil Corporation, United States of America
- Maurel & Prom, France
- MedcoEnergi, Indonesia
- MOL Group, Hungary
- Naftna Industrija Srbije, Serbia
- Naftogas of Ukraine, Ukraine
- National Iranian Oil Company (NIOC), Iran
- National Oil Corporation, Libya
- Nexen, Canada
- Nippon Oil, Japan
- NNPC, Nigeria
- Oil and Gas Development Company Limited[1], Pakistan
- Occidental Petroleum, United States of America
- Oil India Limited, India
- Oman Oil Company (OOC), Oman
- OMV, Austria
- ONGC, India
- PKN Orlen S.A., Poland
- Pacific Rubiales Energy, Canada
- PSO, Pakistan
- Pakistan Petroleum Pakistan
- Pertamina, Indonesia
- Petróleos Mexicanos, Mexico
- Petróleos de Venezuela, Venezuela
- Petroleum Development Oman,(PDO)
- Perenco, France, United Kingdom
- Petrobras, Brazil
- PetroChina, China
- Petroecuador, Ecuador
- PetroKazakhstan, Canada
- Petrom, Romania
- PETRONAS, Malaysia
- Petronet LNG Limited, India
- Petroperu, Peru
- Petrotrin, Trinidad and Tobago
- PetroVietnam, Vietnam
- Polish Oil and Gas Company, Poland
- Plains Exploration & Production Company (PXP), United States of America
- PTT Public Company Limited, Thailand
- Qatar Petroleum, Qatar
- Reliance Industries Limited, India
- Repsol YPF, Spain
- Rompetrol, Romania
- Rosneft, Russia
- Royal Dutch Shell, Netherlands, United Kingdom
- Russneft, Russia
- RWE Dea, Germany
- Santos Limited, Australia
- Sasol, South Africa
- Saudi Aramco, Saudi Arabia (the largest in the world)
- Sinopec, China
- SNPC, Congo-Brazzaville
- Sonangol, Angola
- Sonatrach, Algeria
- Sovereign Group, USA, Russia
- Singapore Petroleum Company, Singapore
- Statoil, Norway
- State Oil Company of Azerbaijan, SOCAR Azerbaijan
- Sudapet, Sudan
- Suncor Energy, Canada
- Surgutneftegaz, Russia
- Syncrude, Canada
- Talisman Energy, Canada
- Todd Energy, New Zealand
- Total S.A., France
- Tullow Oil, United Kingdom
- Türkiye Petrolleri Anonim Ortaklığı (TPAO), Turkey
- Vaalco Energy Inc., United States of America
- Vallourec & Mannesmann - France
- Vegas Oil and Gas (Kriti), Egypt
- Wintershall, Germany
- Woodside Petroleum, Australia
- XTO Energy, United States of America
- YPF, Argentina
- YPFB, Bolivia
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