• MarkWest Liberty Gas Gathering, L.L.C.
• Matrex, L.L.C.
• MarkWest Pioneer, L.L.C.
• Contango Energy CO
• Mewbourne Energy Partners 08-A LP
• ARX Gold Corp
• Lilis Energy, Inc.
• Savoy Energy Corp
• Rangeford Resources, Inc.
• SandRidge Operating CO
• SandRidge Holdings, Inc.
• SandRidge Offshore, LLC
• SandRidge Midstream, Inc.
• SandRidge Tertiary, LLC
• SandRidge Exploration & Production, LLC
• Integra Energy, L.L.C.
• Lariat Services, Inc.
• SandRidge Onshore, LLC
• Circle Star Energy Corp.
• Mesa Energy Inc
• Laredo Oil Inc
• Ecopetrol S.A.
• NewStream Energy Technologies Group Inc
• Encore Clear Fork Pipeline LLC
• Encore Energy Partners Finance CORP
• Encore Energy Partners Operating LLC
• Atlas Energy Indiana, LLC
• Atlas Energy Tennessee, LLC
• Titan Oil & Gas, Inc.
• Dove Energy, Inc.
• Sylios Corp
• Petrobras Argentina S.A.
• Noble Holding International Ltd
• Bakken Resources Inc
• Discovery Ridge Resources, Inc.
• JXTG Holdings, Inc.
• Casablanca Mining Ltd.
• MarkWest Gas Marketing, L.L.C.
• MarkWest McAlester, L.L.C.
• Delta Pipeline, LLC
• Delta Risk Management, LLC
• Carrizo Marcellus Holding Inc.
• Carrizo (Marcellus) LLC
• Alaska Pacific Energy Corp
• Equinor Energy As
• Eagle Rock Midstream, L.P.
• Eagle Rock Desoto Pipeline, L.P.
• CMA Pipeline Partnership, LLC
• Galveston Bay Gathering, LLC
• Eagle Rock GOM, L.P.

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