- BP
- Royal Dutch Shell
- ЛУКОЙЛ
- Роснефть
- Сургутнефтегаз
- ТНК-BP
- Pemex
- NIOC
- Statoil
- Exxon Mobil
- Saudi Aramco
- CNPC
- Chevron corporation
- Kuwait Petroleum Corporation
- INOC
- Nigerian National Oil Corporation
- ГНКАР
- Woodside Petroleum Limited
- PetróleosdeVenezuela
- ENI S.p.A.
- CNOOC Limited
- Valero Energy Corporation
- Sinopec Group
- The Rompetrol Group N.V
- КазМунайГаз
- Total S.A