Miskolc Enterprise, S.L.
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. (NNPC)
- Oil & Natural Gas Corp. Ltd. (ONGC) [India]
- 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