| 1 (5) | China National Petroleum Corp * | CHN |  |
| 2 (6) | PetroChina Co Ltd | CHN | |
| 3 (14) | China Petroleum and Chemical Corporation * | CHN | |
| 4 (26) | Aramco * | MUL | |
| 5 (33) | Saudi Arabian Oil Company | SAU | |
| 6 (46) | China Railway Engineering Corp * | CHN | |
| 7 (49) | Schlumberger * | MUL | |
| 8 (54) | ExxonMobil * | MUL | |
| 9 (55) | China Railway Group Ltd | CHN | |
| 10 (58) | TOTAL * | MUL | |
| 11 (60) | Total, France | FRA | |
| 12 (63) | China Railway Eryuan Engineering Group Co Ltd | CHN | |
| 13 (64) | Shell * | MUL | |
| 14 (84) | Equinor ASA, Norway | NOR | |
| 15 (94) | Shell, Netherlands | NLD | |
| 16 (95) | Equinor ASA * | MUL | |
| 17 (156) | Schlumberger, United States | USA | |
| 18 (213) | Shell, USA | USA | |
| 19 (216) | China National Offshore Oil Corp * | CHN | |
| 20 (239) | GNS Science | NZL | |
| 21 (270) | Chevron Corp | USA | |
| 22 (402) | Petrobras * | MUL | |
| 23 (404) | Petrobras Brasil | BRA | |
| 24 (529) | China Coal Research Institute | CHN | |
| 25 (590) | Daqing Oilfield Co Ltd, CN | CHN | |
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