1 (24) | China National Petroleum Corp * | CHN | ||
2 (31) | PetroChina Co Ltd | CHN | ||
3 (34) | China Petroleum and Chemical Corporation * | CHN | ||
4 (115) | China National Offshore Oil Corp * | CHN | ||
5 (209) | Schlumberger * | MUL | ||
6 (308) | SINTEF Group | NOR | ||
7 (351) | Shell * | MUL | ||
8 (358) | Petrobras * | MUL | ||
8 (358) | Petrobras Brasil | BRA | ||
10 (400) | Total, France | FRA | ||
10 (400) | TOTAL * | MUL | ||
12 (418) | GNS Science | NZL | ||