Abu Dhabi National Oil Company
Bharat Petroleum Corporation Limited
BHP Billiton Limited
BP plc
Cenovus Energy Inc.
Centrica plc
Chevron Corporation
China National Petroleum Corporation (CNPC)
CNOOC Limited
Compania Espanola de Petroleos S.A. (CEPSA)
ConocoPhillips
Cosmo Oil Co. Ltd.
CPC Corporation
Taiwan
Delek Energy Systems Ltd.
Dubai Petroleum
Ecopetrol S.A.
Egyptian General Petroleum Corporation (EGPC)
Empresa Nacional del Petroleo SA
Empresas Copec S.A.
Eni S.p.A
Exxon Mobil Corporation
Formosa Petrochemical Corporation
Galp Energia SGPS
S.A.
Gas Natural Fenosa
GasTerra B.V.
Gasum Oy
GDF Suez SA
Grupa Lotos SA
GS Caltex Corporation
Hellenic Petroleum S.A.
Hindustan Petroleum Corp
Husky Energy Inc
Idemitsu Kosan Co. Ltd.
Imperial Oil Limited
Indian Oil Corporation Limited
International Petroleum Investment Company PJSC
JSOC Bashneft
JX Holdings Inc.
Korea Gas Corporation
Lundin Petroleum AB
Maersk Oil and Gas A/S
Mercuria Energy Group Ltd
Mitsui Oil Exploration Co. Ltd.
Motor Oil (Hellas) Corinth Refineries S.A.
Murphy Oil Corporation
National Iranian Oil Company
Neste Oyj
Nexen Energy ULC
Nigerian National Petroleum Corporation
Noble Energy
OAO Gazprom
OAO Lukoil
Oil Refineries Ltd
Oilinvest (Netherlands) B.V.
OJSC Rosneft Oil Company
OMV Group
Pacific Exploration and Production Corporation
Pakistan Petroleum Limited
Partex Oil and Gas Holdings Corporation
Petro SA
Petrobras Argentina S.A.
Petroceltic International PLC
PetroChina Company Limited
Petroleo Brasileiro S.A. (Petrobras)
Petroleos Mexicanos (PEMEX)
Petroliam Nasional Berhad (PETRONAS)
Petron Corporation
Philippine National Oil Company
Phoenix Petroleum Philippines Inc.
Polish Oil and Gas Company (PGNiG SA)
Polski Koncern Naftowy ORLEN SA
Preem AB
PT Pertamina (Persero)
PTT Public Company Limited
Reliance Industries Limited
Repsol
S.A
Rohol-Aufsuchungs Aktiengesellschaft
Royal Dutch Shell plc
RWE AG
Saras S.p.A.
Sasol Limited
Saudi Aramco
SEAOIL Philippines Inc.
Showa Shell Sekiyu
Singapore Petroleum Company Limited
SK Innovation Co. Ltd.
S-Oil Corporation
Statoil ASA
Suncor Energy Inc
Todd Energy
TOTAL S.A.
Trafigura Group PTE
Tupras (Turkish Petroleum Refineries Co)
Turkiye Petrolleri Anonim Ortakligi
Unipetrol a.s
Valero Energy Corporation
Vitol Group
Wintershall Holding GmbH
YPF SA