- Aegis Energy, Inc.
- Anadarko Minerals, Inc.
- Anglo-Suisse, Inc.
- Antara Resources, Inc.
- Aries Resources
- Aurion Technologies, Inc.
- BG Exploration America, Inc.
- Bay City Minerals, Inc.
- Benz Energy, Inc.
- Bravo Resources, Inc.
- Briggs Cockerham, LLC
- Carrollton Resources Corporation
- Cascade Separations Inc.
- CenTerra Natural Resources
- Centurion Exploration Co.
- Century Offshore Management Corporation
- Chaparral Energy, Inc.
- Cheniere Energy, Inc.
- Collins & Ware, Inc.
- Costilla Energy, Inc.
- Ellora Energy LLC
- Energy Ingenuity Company
- Energy Search Incorporated
- Enron Finance Corp
- Exploration Techniques Inc.
- FPB Cogeneration Partners, LP
- Falcon Bay Energy, L.L.C.
- Frontier Natural Gas Corporation
- Genesis Producing Company
- GeoPetro Resources Company
- Grand Gulf Production LLC
- Ground Truth Technology, Inc.
- Harken Energy Corporation
- Harris Technologies Inc.
- International Methane Company Limited
- Ironwood Resources, Ltd
- Ivanhoe Energy, Inc.
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- Kerns Oil & Gas, Inc.
- Land and Natural Resource Development, Inc.
- Magnum Petroleum, Inc.
- Municipal Energy Resources Partners, Ltd
- MX Energy
- Natural Gas Clearinghouse
- OPMI Operating Company, Inc.
- Osprey Petroleum Company, Inc.
- Prairie Petroleum, Inc.
- Quisto Ventures LC
- Redland Energy, Inc.
- Reliant Exploration
- Rutter and Wilbanks Corporation
- Sago Energy, LLC
- Shell Western E&P Inc.
- Shell Western E&P Inc.
- Snyder Oil Corporation
- South Coast Exploration
- Southwest Royalties, Inc.
- Sunrise Energy Services
- T.S.C. Oil & Gas, Inc.
- Tarpon Operating & Development
- Tejas Power Corporation
- Tipperary Corporation
- Toce Oil Company, Inc.
- Torch Energy Advisors
- Tracer Research Corporation
- Transco Energy Company
- Tri-Union Development Corporation
- United Gas Pipe Line Company
- Vessels Energy, Inc.
- Wesley West Interests, Inc.
- Wichita River Oil Corporation
- XPLOR Energy, Inc.
- Zavanna, LLC
- Zavanna Canada Corp
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