• Pinnacle Gas Resources, Inc.
• Evolve Transition Infrastructure LP
• Pegasi Energy Resources Corporation.
• Explortex Energy Inc.
• Eagle Rock Energy Partners L P
• Challenger Energy Corp
• Chaparral Energy, L.L.C.
• Chaparral CO2, L.L.C.
• Chaparral Real Estate, L.L.C.
• Chaparral Resources, L.L.C.
• NorAm Petroleum, L.L.C.
• CEI Acquisition, L.L.C.
• Abraxas Petroleum Corp. 401(K) Profit Sharing Plan
• Exterra Energy Inc.
• Sino American Oil Co
• NEG Oil & Gas LLC
• Petrolia Energy Corp
• Atlas Energy Resources, LLC
• DevMar Equities, Inc.
• Ellora Energy Inc.
• MV Oil Trust
• Cross Border Resources, Inc.
• Petrohawk Holdings, LLC
• P-H Energy, LLC
• Winwell Resources, L.L.C.
• Petrohawk Properties, LP
• Petrohawk Operating CO
• Hawk Field Services, LLC
• WSF, Inc.
• TAMM Oil & Gas Corp.
• Atlas Resources Public #16-2007 (A) L.P.
• Atlas Resources Public #16-2007 Program
• Amazing Energy Oil & Gas Co
• Rockies Region 2006 Limited Partnership
• Atrisco Oil & Gas LLC
• Mogul Energy International, Inc.
• Eagle Rock Energy GP, L.P.
• Eagle Rock Energy G&P, LLC
• Future Quest Nevada, Inc.
• Atlas America Series 27-2006 L.P.
• Petro Horizon Energy Corp.
• Diamondback Energy Services, Inc.
• CEI Pipeline, L.L.C.
• Rock City Energy Corp.
• Grizzly Energy, LLC
• Ring Energy Inc.
• Tiger Oil & Energy, Inc.
• Crown Oil & Gas Inc.
• Mongolia Holdings, Inc.
• Kentucky USA Energy, Inc.

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