1. AGL Energy Limited
2. Baker Hughes Company
3. Black Diamond Energy Inc.
4. BP P.L.C.
5. CNOOC International
6. ConocoPhillips Company
7. Far East Energy Corporation
8. Fortune Oil Limited
9. Great Eastern Energy Corporation Ltd.
10. Halliburton Energy Services Inc.
11. Metgasco Limited
12. Origin Energy Limited
13. Ovintiv Inc.
14. Petroliam Nasional Berhad
15. Pioneer Natural Resources Company
16. Quicksilver Resources
17. Reliance Power Limited
18. Santos Ltd.
19. Senex Energy Limited