• Purcell Energy Ltd
• Luke Energy Ltd/New
• Nce Acquisition Inc
• Gran Tierra Energy Inc.
• Comstock Oil & Gas Holdings Inc
• Comstock Oil & Gas Louisiana LLC
• Saxon Capital Group Inc
• Rhino Biotech Limited
• Triangle Petroleum Corp
• Mewbourne Energy Partners 04-A LP
• Battalion Oil Corp
• Mewbourne Energy Partners 05-A LP
• Atlas America Series 25-2004 (A) L.P.
• Emerald Oil, Inc.
• Mondial Ventures, Inc.
• Protec Industries Inc
• T-Rex Oil, Inc.
• Atlas Resources LLC
• Petrosearch Energy Corp
• W&T Offshore Inc.
• South Texas Oil Co
• Index Oil & Gas Inc.
• Baseline Oil & Gas Corp.
• Antero Resources Corp
• MarkWest Energy Operating CO LLC
• Basin Pipeline LLC
• West Shore Processing CO LLC
• MarkWest Energy Appalachia LLC
• MarkWest Michigan Pipeline CO LLC
• MarkWest Oklahoma Gas CO LLC
• MarkWest Power Tex LLC
• MarkWest Pinnacle LLC
• MarkWest PNG Utility LLC
• MarkWest Texas PNG Utility LLC
• MarkWest Blackhawk LLC
• MarkWest New Mexico LLC
• True North Energy CORP
• Meridian Resource & Exploration LLC
• Louisiana Onshore Properties LLC
• Vermilion Energy Inc. Common
• Callon Petroleum Operating CO
• Callon Offshore Production, Inc.
• Mississippi Marketing, Inc.
• Atlas America Series 25-2004 (B) L.P.
• Atlas America Public #14-2004 L.P.
• Apollo Drilling, Inc.
• Quantum Energy Inc.
• Cross Canyon Energy Corp.
• PetroHunter Energy Corp
• American International Holdings Corp

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