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National Oil Companies (wholly or primarily government owned)
- Abu Dhabi National Oil Co. (ADNOC)
- China National Offshore Oil Corp. Ltd. (CNOOC)
- China National Petroleum Corp. (CNPC)
- Chinese Petroleum Corp. [Taiwan]
- Dansk Olie og Naturgas AS (DONG) [Denmark]
- Egyptian General Petroleum Corp. (EGPC)
- Empresa Colombiana de Petroleos (Ecopetrol) [Colombia]
- Empresa Nacional del Petroleo (ENAP) [Chile]
- Fortum Oy [Finland]
- Gazprom [Russia]
- Japan Petroleum Exploration
- Kuwait Petroleum Corp. (KPC)
- Myanma Oil & Gas Enterprise [Myanmar (Burma)]
- National Iranian Oil Co. (NIOC)
- Nigerian National Petroleum Corp.
- Oil & Natural Gas Corp. Ltd. (ONGC) [India]
- Perez Companc SA (PECOM) [Argentina]
- Pertamina [Indonesia]
- Petroleo Brasilerio SA (Petrobras)
- Petroleos del Ecuador (PetroEcuador)
- Petroleos del Peru (Petroperu)
- Petroleos de Venezuela SA (PDVSA)
- Petroleos Mexicanos (PEMEX)
- Petroleum Co. of Trinidad and Tobago Ltd. (Petrotrin)
- Petroleum Development Oman LLC
- Petroleum Exploration & Production Authority (PEPA) [Yemen]
- Petronas [Malaysia]
- PTT Exploration & Production Public Co. Ltd. (PTTEP) [Thailand]
- Qatar Petroleum Corp.
- Rompetrol [Romania]
- Saudi Arabian Oil Co. (Saudi Aramco)
- Sonangol [Angola]
- Sonatrach [Algeria]
- State Oil Co. of Suriname Ltd. (Staatsolie)
- Statoil ASA [Norway]
- Turkiye Petrolleri Anonim Ortakligi (TPAO) [Turkey]
- PetroVietnam
Integrated Global (Major) Companies
- Amerada Hess Corp.
- BP plc
- ChevronTexaco Corp.
- ConocoPhillips Co.
- ENI SpA
- ExxonMobil Corp.
- Kerr-McGee Corp.
- Marathon Oil Corp.
- Murphy Oil Corp.
- Occidental Petroleum Corp.
- Petro-Canada
- Shell (Royal Dutch/Shell Group)
- Total
Additional Companies
– Outside the U.S. Additional (Independent)
Companies – U.S.
- Anadarko Petroleum Corp.
- Apache Corp.
- Berry Petroleum Co.
- Burlington Resources Inc.
- Cabot Oil & Gas Corp.
- Callon Petroleum Co.
- Chesapeake Energy Corp.
- CMS Energy Corp.
- Denbury Resources Inc.
- Devon Energy Corp.
- El Paso Corp.
- Energen Corp.
- EOG Resources Inc.
- Equitable Resources
- Evergreen Resources Inc.
- Forest Oil Corp.
- Houston Exploration Co.
- Koch Industries Inc.
- Newfield Exploration Co.
- Noble Energy
- Nuevo Energy Co.
- Ocean Energy Inc.
- Pioneer Natural Resources Co.
- Plains Resources Inc.
- Pogo Producing Co.
- Ruwco Oil & Gas Corp.
- Questar Corp.
- Seneca Resources Corp.
- Stone Energy Corp.
- Swift Energy Co.
- Unocal Corp.
- Vintage Petroleum Inc.
- Westport Resources Corp.
- Williams Companies Inc.
- XTO Energy