- Abraxas Petroleum Corporation
- Addison Oil, LLC
- Agave Energy Corporation
- Anadarko Petroleum Corporation
- Apache Corporation
- Atlas Pipeline Mid-Continent, LLC
- B&L Exploration LLC
- Ballard Exploration Co., Inc.
- Bass Enterprises Production Company
- Benchmark Oil & Gas Co.
- Bengas Midstream LLC (BEUSA)
- BEPCO, L.P.
- Bridas Energy USA, Inc.
- Cabot Oil & Gas Corporation
- Caerus Piceance
- Capital Star Oil & Gas Inc.
- Castex Energy, Inc.
- CCI Gulf Coast Upstream LLC
- CCI Paradox Upstream
- Charro Operating Company, LLC
- Chesapeake Operating, Inc.
- Choice Exploration
- Cimarex Energy Co.
- Cleco Midstream Resources, LLC
- CML Exploration, LLC
- Collbran Valley Gas Gathering, LLC
- ConocoPhillips Company
- Continental Resources, Inc.
- Copano Field Services/North Texas LLC
- Core Process & Compression, LLC
- Crescent Point Energy
- Crestwood New Mexico Pipeline LLC
- DCP Midstream Partners, LP
- Denbury Onshore LLC
- Devon Energy Corporation
- Dewbre Petroleum Corporation
- Discovery DJ Services, LLC
- Dominion Exploration & Production, Inc.
- Eagle Rock Desoto Pipeline
- Edge Petroleum Operating Company
- Enbridge Gathering (North Texas) L.P.
- Enbridge Pipelines (East Texas) L.P.
- Encana Oil & Gas (USA) Inc.
- Energy Transfer Company
- English Bay Pipeline, LLC
- Enterprise Gathering LLC
- Enterprise Products Operating LLC
- EOG Resources, Inc.
- EQT Gathering, LLC
- Eureka Hunter Pipeline, LLC
- ExxonMobil
- Fairplay Midstream, LP
- Fairways Exploration & Production Co., LLC
- Fidelity Exploration & Production Co.
- First On Site Services
- Freeport LNG Development, LP
- Gas Solutions II, Ltd.
- Gateway Resources USA, Inc.
- GE Oil & Gas
- Goodrich Petroleum Company, LLC
- Great Lakes Energy Partners, LLC
- Greystone Oil & Gas, LP
- Harding & Shelton, Inc.
- Hesco Pipeline
- Hilcorp Energy Company
- Hunt Petroleum Corporation
- James A. Whitson, Jr.
- Jory L. Bernard, LLC
- Ken-Tex Energy Corporation
- Kinder Morgan Tejas Pipeline, LLC
- Kingwood Exploration LLC
- Lapis Operating, Inc.
- LDH Energy Mont Belvieu L.P.
- Lone Star Mont Belvieu L.P.
- Lucid Energy Group, LLC
- M2 Fairplay, LLC
- M2 Louisiana Gas Service, LLC
- M2 Midstream, LLC
- Magnum Hunter Resources, Inc.
- MarkWest Energy Partners, L.P.
- MarkWest Liberty Midstream & Resources LLC
- MarkWest Pinnacle, LLC
- MarkWest Utica EMG, LLC
- MarkWest Western Oklahoma Gas Company, LLC
- Merit Energy Company
- Millennium Midstream Energy, LLC
- Miller, Dyer & Co., L.L.C.
- MLC Operating, LP
- MME Midstream, L.P.
- Monument Pipeline, LP
- Mullins & White Exploration, Inc.
- Neumin Production Company
- Noble Energy Inc.
- Oakhill Pipeline, L.P.
- ORX Resources, Inc.
- Oxy USA, Inc.
- Paradox Midstream, LLC
- Patara Oil & Gas LLC
- Patterson Petroleum LLC
- Peak Wyoming Acquisitions, LLC
- Pegasi Energy Corporation
- Pioneer Gas Pipeline, Inc.
- Premier Natural Resources II, LLC
- Questar Gas Management Company
- Questar Pipeline Company
- Questar Transportation Services Company
- Radius Operating
- Range Operating Texas, LLC
- Range Resources - Appalachia, LLC
- Reef Exploration, Inc.
- Reichmann Petroleum Corporation
- Resaca Resources
- Ridgeland Operating, LLC
- Rising Star Energy, LLC
- Ryckman Creek Resources, LLC
- Sabine Valley Pipeline, Inc.
- Salt Creek Midstream, LLC (ARM Energy)
- Samson Exploration LLC
- Samson Lone Star LP
- Samson Resources
- Sandalwood Exploration, LP
- Smith Production Company
- Smith Production, Inc.
- SND Operating, LLC
- Sotex Fuels LLC
- Southern Union Gas Services, Ltd.
- Springfield Pipeline, LLC
- Square Mile Energy
- St. Mary Land & Exploration Company
- State Line Gathering System, LLC
- Stroud Energy, Ltd.
- Summit Gas Gathering, LLC
- Superior Pipeline Company
- SV Energy Company, LLC
- Talco Midstream Assets, Ltd.
- Texas Gas Sales, LLC
- Texas Midstream Gas Services, LLC
- Toledo Gas Gathering L.L.C.
- Treetop Midstream Services, LLC
- Triad Hunter, LLC
- Trinity River Energy, LLC
- United Process Systems
- United Rentals, Inc.
- Urban Oil and Gas Group
- Virco, Inc.
- VR Pipeline Company, LP
- Wesco Production LLC
- White Oak Energy LP
- Whiting Oil & Gas Corporation
- WildHorse Resources Management Company, LLC
- Williams Field Services Company, LLC
- XTO Energy Inc.
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