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| Anadarko Petroleum | Baker Energy | Bean Resources |
| Bishop Energy | Carrizo Oil and Gas | Chesapeake Energy |
| Cimarex Energy | Delphi Oil Inc | Denbury Resources |
| Desoto Oil and Gas | Dominion Exploration | D and D Drilling |
| Eagle Oil and Gas | Energy Recovery Group | EOG Resources |
| EB Energy & Sons | Escambia Operating | Gungol Exploration |
| Hughes Eastern Copr | Jetta Operating | KCS Resources |
| Land & Natural Resources | Mayne and Mertz | Merit Energy |
| Moon Hines and Tigrett | Midroc Operation | Mosbacher Energy |
| M.S.Hub | O'Brien Resourses | Oilfield Service and Supply |
| PB Energy Storage | Parsons Group | Palmer Petroleum |
| Penn Virginia Oil | Petroci Inc. | Petco Petroleum |
| Pioneer Natural | Pruet Production | Quantum Resources |
| Range Resources | Red Sands Energy | Roundtree & Associates |
| R.W. Tyson Producing | SE USA Operating | SG Resources |
| Samson Resources | Sklar Exploration | Spooner Petroleum Co |
| Stetson Petroleum | Tepee Petroleum | Tecton Energy |
| Tellus Operating Group | Texas Petroleum | TMR Exploration |
| Triple S Well Service | Transco | T.K. Stanley |
| Ventex Operating | Venture Oil and Gas | Will Drill |
| Threshold Development | Par Minerals | Warrior Energy |
| Leaf River Energy | MS Rural Tank Service | Cornwell Well Svc |
| Renaissance Energy | Fairways Exploration | Kelly Brothers |
| Liberty Resources | Lonquist Field Svc | Crosby Creek O&G |