• Regency Energy Finance CORP
• Mainland Resources Inc.
• Blackbird Petroleum Corp
• Dpca, LLC
• CLLR, Inc.
• Rex Energy Corp
• Encore Energy Partners LP
• SilverBow Resources Operating, LLC
• Atlas Resources Public #17-2008 (B) L.P.
• Atlas Resources Public #17-2007 (A) L.P.
• Atlas Resources Public #17-2007 Program
• TexCal Energy South Texas L.P.
• TexCal Energy (GP) LLC
• TexCal Energy (LP) LLC
• Insight Management Corp
• Abraxas Energy Partners LP
• NiMin Energy Corp.
• Energy XXI Texas Onshore, LLC
• Energy XXI GOM, LLC
• Energy XXI Gulf Coast, Inc.
• Energy XXI Onshore, LLC
• United Refining Energy Corp
• Approach Resources Inc
• Osage Exploration & Development, Inc.
• Quest Energy Partners, L.P.
• Pioneer Southwest Energy Partners L.P.
• Rockies Region 2007 LP
• Premier Energy Corp.
• Green Country Supply, Inc.
• Himalaya Technologies Inc
• Southfield Energy CORP
• Baron Energy Inc.
• Enterprise Products Operating LLC
• Antero Resources Midstream Corp
• Antero Resources Pipeline Corp
• Antero Resources Piceance Corp
• Reef Oil & Gas Income & Development Fund III LP
• EXCO Partners, LP
• Forest Oil Permian CORP
• MarkWest Energy GP, L.L.C.
• Resolute Energy Partners, LP
• SRC Energy Inc.
• EV Energy Finance Corp.
• EV Properties GP, LLC
• EV Properties, L.P.
• Evcg GP, LLC
• CGAS Properties, L.P.
• Evpp GP, LLC
• EnerVest Production Partners, Ltd.
• EnerVest Monroe Marketing, Ltd.

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