- Arbusto Energy
- Anadarko Petroleum Corporation, USA
- BHP Billiton, Australien
- BP, Storbritannien
- Chevron, USA
- Citgo, USA
- Conoco Phillips, USA
- DNO, Norge
- Ecopetrol, Colombia
- Eni, Italien
- Exxon Mobil, USA
- Gulf Oil, USA
- Hess Corporation, USA
- Husky Energy, Kanada
- Irving Oil, Kanada
- Koch Oil
- Kerr McGee, USA
- Lundin Petroleum, Sverige
- Lukoil, Ryssland
- Marathon Oil Corporation, USA
- Marathon Petroleum Corporation, USA
- Neste Oil, Finland
- Norsk Hydro, Norge
- Nynas, Sverige
- PA Resources AB, Sverige
- PDVSA, Venezuela
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- Petrobras, Brasilien
- Petroleos Mexicanos, Mexiko
- Petro Canada, Kanada
- Petro Peru, Peru
- Petro Kina, Kina
- Petronas, Malaysia
- Phillips 66, USA
- Phillips Petroleum, USA
- Pioneer Natural Resources, USA
- Preem, Sverige
- Qatar Petroleum
- Repsol, Spanien
- Santos, Australien
- Shell, Storbritannien
- Sonangol, Angola
- Statoil, Norge
- Talisman Energy
- Tanganyika Oil, Kanada Sverige
- Teikoku Oil Co
- Total Energies, Frankrike
- West Siberian, Sverige
- Woodside Petroleum, Australien
- YPF, Argentina
- YPFB, Bolivia
- YUKOS, Ryssland
- Pallas Oil AB, Sverige
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