Operator List: A

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A & A Production A & A Well Service A & D Gas, Inc. A P S, Inc. A-1 Well Service A. Francis Vonfeldt Co. A. R. & R., Ltd. Aaron Oil Operations LLC AAS Oil Co., Inc. Abderhalden, R. R. Abercrombie Energy, LLC Abercrombie, A. L., Inc ABS Oil, Inc. Abundant Oil Company, A General Partnership Ace Energy LLC ACE Oil Company Ad Astra Oil LLC Adeco, Inc. Adelaide Energy LLC Advantage Resources, Inc. Aexco Petroleum, Inc. Agape Service Incorporated Agricultural Energy Services AGV Corp. Aiello Oil

Ainsworth Operating Co. AJ Oil, Inc. ALB, INC. Albert R. Braun Oil Operations, LLC (Estate) Albert Thornbrough Trust Aleo Oil Company, LLC Alexander, Gary M. Allam Production, Inc. Altavista Energy, Inc. Alton Oil LLC Amarillo Exploration, Inc. Ambrotra Energy LLC American Energy Resources LLC American Land And Energy LLC American Star Energy Services, LLC American Tank Service LLC American Warrior, Inc. AmeriKan Oil, LLC Anadarko E & P Onshore LLC Anadarko Petroleum Corporation Anchor Bay Petroleum Anchor Bay Petroleum LLC Anderson Energy, Inc. Anderson Oil Ltd. Anderson, Jerry

Anderson, Kendra A. Anstine & Musgrove Inc. Anstine Oil Company AP Operating LLC APATAO, LLC APEX Resources LLC Apollo Energies, Inc. Arcadian Resources, LLC ARDC INC. Area Management Corp Argent Energy (US) Holdings, Inc. Argent Energy, Inc. Armadilla Oil & Gas, LLC Armor Petroleum, Inc. ARP Operating, LLC Arrowhead Exploration, LLC Ashlock, Beryl Roderick Atlas Operating LLC Audrey Oil & Gas LLC Avalanche Oil & Gas LLC Azkan Oil & Gas LLC Aztec Oil Operating LLC