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
Assama Oil Services (Tripoli), Libya
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