Oil and Gas/Petroleum Companies.
* Alwarid Oil Services Company,alwaridoil.com,Libya
* Aban Offshore Oil Company
* Abu Dhabi National Oil Company (ADNOC), United Arab Emirates
* Agip Petroli S.p.A
* AinMine Petroleum
* Aker Geo AS, Norway
* Alon USA, Dallas, Texas, United States of America
* 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
* Arbusto Energy, dba: Spectrum 7, United States of America, Saudi Arabian,
and possibly Swiss ownership. Bought out by Harken Oil & Gas in 1986
* Assam Oil Company Ltd. (ACL), India
* Atlantic Petroleum, Faroe Islands
* Athlone Group, United Kingdom
* Bharat Petroleum Corporation Limited, India
* BG Group, United Kingdom
* BHP Billiton, Australia
* BreitBurn Energy, California, United States of America
* Buzachi Petroleum Operating, Kazakhstan
* British Petroleum (BP), United Kingdom
* Cairn Energy, United Kingdom
* Canadian Natural Resources, Canada
* Chevron Corporation, San Ramon, California, United States of America
* Chem-Energy Corporation, United States of America
* Chestnut Petroleum, Inc., Richardson, Texas, United States of America
* Chief Oil and Gas, Dallas, Texas, United States of America
* Citgo, Venezuela
* CNOOC Ltd., China
* ConocoPhillips, United States of America
* Cooper Energy, Australia
* Cosmo Oil Company, Japan
* Crown Central Petroleum, United States of America
* Cupet, Cuba
* Denbury Resources, Inc., United States of America
* Det Norske Oljeselskap ASA, Norway
* Devon Energy, United States of America
* Dong, Denmark
* Ecopetrol, Colombia
* Edoardo Raffinerie Garrone, Italy
* Empresa Nacional del Petróleo (ENAP), Chile
* Enbridge, Canada
* EnCana, Canada
* Energopetrol, Bosnia
* ENSCO International, United States of America
* Eni, Italy
* ENX, Switzerland
* ENXRU, Russia
* Essar oil ltd., India
* Entreprise Tunisienne d'Activites Petroliere (ETAP), Tunisia
* Eser Corporation, United States of America
* ExxonMobil, United States of America
* First Texas Energy Corporation, United States of America
* Flying Jadooo (for sale), United States of America
* Galp Energia, Portugal
* Gazprom, Russia
* Geoexploration india, IN, India
* Global Energy Swiss AG, ZUG, Swizterland
* Greka Energy, United States of America
* Grupa LOTOS, Poland
* Gujarat Gas Co. Ltd., India
* Gujarat State Petroleum Corporation, India
* Gulf Oil, Luxembourg
* Harken Energy Corporation, dba: HKN Southlake, Texas,
United States of America of America
* Hellenic Petroleum, Greece
* 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
* Irving Oil, Canada
* IQ Petroleum, USA
* Japan Energy, Japan
* Japan Petroleum Exploration Company Limited (JAPEX), Japan
* Jay Oil, Iran
* Kaz-Munay Gaz, Kazakhstan
* Karazhanbas Munay, Kazakhstan
* Korea National Oil Corporation(KNOC), South Korea
* Koch Industries, United States of America
* Kuwait German Petroleum Company, Canada
* Kuwait Gulf Oil Company, Kuwait
* Kuwait National Petroleum Company Kuwait.
* Kuwait Oil Company, Kuwait
* Kuwait Petroleum Corporation, Kuwait
* Leowit Group Ltd, Hong Kong
* LUKoil, Russia
* M3nergy Gamma SDN. BHD., Malaysia
* Maersk, Denmark
* Marathon Oil Corporation, United States of America
* Maurel & Prom, France
* Mari Gas Company Limited, Pakistan
* Maxol Group, Republic of Ireland
* MedcoEnergi, Indonesia
* Misc, Malaysia
* MOL Group, Hungary
* Naftna Industrija Srbije, Serbia
* Naftogas of Ukraine, Ukraine
* National Iranian Oil Company (NIOC), Iran
* National Oil Corporation, Libya
* Neste Oil, Finland
* Nexen, Canada
* Nippon Oil, Japan
* NNPC, Nigeria
* Northern Resources[1], Canada
* Northern Oil and Gas[2], United States of America
* Oil Planet International Corporation OPIC
united States of America www.oilplanetinternationcorp.com
* Oil and Gas Development Company Limited[3], Pakistan
* Occidental Petroleum, United States of America
* Oil India Limited, India
* Oil and Natural Gas Corporation, India
* OilandGasSuppliers.com [4], United States of America
* Oman Oil Company (OOC), Oman
* OMV, Austria
* ONGC, India
* PKN Orlen S.A., Poland
* Pacific Rubiales Energy, Canada
* PSO, Pakistan
* Pasargad Oil, Iran
* Petroleos Mexicanos, Mexico
* Pertamina, Indonesia
* Petróleos de Venezuela, Venezuela
* PetroAlam, Egypt
* Petroleum Development Oman,(PDO)
* Perenco, France, United Kingdom
* Petro-Canada, Canada
* Petrobras, Brazil
* PetroChina, China
* PetroKazakhstan, Kazakhstan
* Petrom, Romania
* Petron Corporation, Philippines
* PETRONAS, Malaysia
* Petronet LNG Limited, India
* Petropars Ltd., Iran
* 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
* Questar, United States of America
* Reliance Industries Limited, India
* Repsol YPF, Spain
* Revus, Norway
* Rompetrol Group N.V., Romania
* Rosneft, Russia
* Royal Dutch Shell, Netherlands, United Kingdom
* RWE Dea AG, Germany
* Sagiz Petroleum, Kazakhstan
* Samir (Société Anonyme Marocaine de l'Industrie du Raffinage), Morocco
* San-Ai Oil, Japan
* Santos Limited, Australia
* Sasol, South Africa
* Saudi Aramco, Saudi Arabia (the largest in the world)
* Schlumberger solutions France
* Shell Canada, Canada (subsidiary of Royal Dutch Shell)
* Shell Oil Company, United States of America (subsidiary of Royal Dutch Shell)
* Sinclair Oil, United States of America
* 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
* Somerset Refinery, United States of America
* St. Mary Land & Exploration, United States of America
* State Oil Company of Suriname, Suriname
* Suncor Energy, Canada
* Surgutneftegaz, Russia
* Syncrude, Canada
* Talisman Energy, Canada
* Tesoro, United States of America
* Texaco, United States of America
* THUMS, United States of America
* Todd Energy, New Zealand
* Total, France
* Tullow Oil, United Kingdom
* Türkiye Petrolleri Anonim Ortaklığı (TPAO), Turkey
* United Refining Company, United States of America
* Ucimet Ltd, UK
* Vaalco Energy Inc., United States of America
* Valero Energy Corporation, United States of America
* Vegas Oil and Gas (Kriti), Egypt
* Venoco Inc., United States of America
* Wintershall, Germany
* Woodside Petroleum, Australia
* XTO Energy, United States of America
* YPF, Argentina
* YPFB, Bolivia
* Zorro Oil, Jember
* Halliburton, United States of America