Operator List: A

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A & A Discovery, LLC A & A Production A & A Well Service A & D Gas, Inc. A & L Energy Operations LLC A P S, Inc. A X & P, Inc. A-1 Well Service A. Francis Vonfeldt Co. A. R. & R., Ltd. Aaron Oil Operations LLC AAS Oil Co., Inc. ABARTA Oil & Gas Co., Inc. Abderhalden, R. R. Abercrombie Energy, LLC Abercrombie, A. L., Inc Able Oil, LLC Abundant Oil Company, A General Partnership Ace Energy LLC ACE Oil Company ACL Production, LLC Ad-Mor Oil, LLC Adams Affiliates, Inc. Adamson, Michael A. Addis, Icer Estate of Adeco, Inc. Adkins Production Co. Admiral Bay (USA) Inc. Advantage Resources, Inc. Aexco Petroleum, Inc. AFG Energy, Inc. Agape Service Incorporated Agricultural Energy Services AGV Corp. Ainsworth Operating Co. AJ Oil, Inc.

ALB, INC. Albert R. Braun Oil Operations, LLC (Estate) Albert Thornbrough Trust Aleo Oil Company, LLC Alexander Production Service Alexander, Gary M. Allam Production, Inc. Allen Drilling Company Alliance Exploration Co., LLC Alliance Operating Company Alonzoil, Inc. Alpar Resources, Inc. Alpha Energy, LLC Altavista Energy, Inc. Alton Oil LLC Amarillo Exploration, Inc. Amcon Resources, Inc. AMERICAN ENERGIES PIPELINE INC American Energies Pipeline, LLC American Energy Resources LLC American Land And Energy LLC American Patriot Oil LLC American Tank Service LLC AMERICAN WARRIOR, INC. American Warrior, Inc. Anadarko E & P Onshore LLC Anadarko Petroleum Corporation Anchor Bay Petroleum Anchor Bay Petroleum LLC Anderson Energy, Inc. Anderson Exploration LLC Anderson Oil Ltd. Anderson, Jerry Anderson, Kendra A. Anderson, Kent (deceased) Anshutz Oil

Anstine & Musgrove Inc. Anstine Oil Company Anstine-Musgrove Antares Oil Corporation AP Operating LLC Apache Corporation APATAO, LLC Apex Operating Company, Inc. Apollo Energies Apollo Energies, Inc. APX Corporation Arbuckle Energy Inc. Arbuckle Enterprises, Inc. Arbuckle, A. Dale & Kathryn E. Rev Trust Arcadian Resources, LLC ARDC INC. Area Management Corp ARES Energy, LTD Argent Energy (US) Holdings, Inc. Argent Energy, Inc. Armada Operating, LLC Armadilla Oil & Gas, LLC Armor Petroleum, Inc. Arrow Production Co. ASG Holdings LLC Asher Associates, Inc. Ashlock, Beryl Roderick Atlas Operating LLC Audrey Oil & Gas LLC Avalanche Oil & Gas LLC Azkan Oil & Gas LLC Aztec Oil Operating LLC