1. Anadarko Petroleum Corporation
2. BP p.l.c.
3. Canadian Natural Resources Limited
4. Chesapeake Energy Corporation
5. Chevron Corporation
6. ConocoPhillips Company
7. Devon Energy Corporation
8. Encana Corporation
9. Eni S.p.A.
10. ESAI Energy LLC
11. Exxon Mobil Corporation
12. Gas Liquid Engineering Ltd
13. Home Propane Inc.
14. Linn Energy Inc.
15. Range Resources Corporation