| 1 (5) | China National Petroleum Corp * | CHN |  |
| 2 (6) | PetroChina Co Ltd | CHN | |
| 3 (13) | China Petroleum and Chemical Corporation * | CHN | |
| 4 (17) | Science System and Applications, Inc | USA | |
| 5 (49) | State Grid Corporation of China * | CHN | |
| 6 (61) | Schlumberger * | MUL | |
| 7 (82) | Saudi Arabian Oil Co, USA | USA | |
| 8 (92) | Aramco * | MUL | |
| 9 (96) | TotalEnergies * | MUL | |
| 10 (122) | Saudi Arabian Oil Co, Saudi Arabia | SAU | |
| 11 (126) | Shell * | MUL | |
| 12 (136) | China National Offshore Oil Corp * | CHN | |
| 13 (148) | TotalEnergies, France | FRA | |
| 14 (151) | Chevron Corp | USA | |
| 15 (158) | Equinor ASA, Norway | NOR | |
| 16 (165) | Schlumberger, United States | USA | |
| 17 (172) | Equinor ASA * | MUL | |
| 18 (199) | Shell, Netherlands | NLD | |
| 19 (285) | Petrobras * | MUL | |
| 20 (289) | China Railway Engineering Corp * | CHN | |
| 21 (295) | Petrobras, Brazil | BRA | |
| 22 (310) | GNS Science | NZL | |
| 23 (315) | China Railway Group Ltd | CHN | |
| 24 (360) | ExxonMobil, USA | USA | |
| 24 (360) | ExxonMobil * | MUL | |
| 26 (375) | China Railway Eryuan Engineering Group Co Ltd | CHN | |
| 27 (513) | China Coal Research Institute | CHN | |
| 28 (610) | Ormat Technologies, United States | USA | |
| 28 (610) | Ormat Technologies Inc * | MUL | |
| 30 (643) | Exploration and Petroleum Engineering Advanced Research Center, SAU | SAU | |
| 31 (995) | Daqing Oilfield Co Ltd, CN | CHN | |
| 32 (1098) | Gazprom Group, Russian Federation | RUS | |
| 33 (1124) | Gazprom Group * | MUL | |
|
