A & A Production
A & A Well Service
A P S, Inc.
A. R. & R., Ltd.
Aaron Oil Operations LLC
AAS Oil Co., Inc.
Abercrombie Energy, LLC
Abercrombie, A. L., Inc
ABS Oil, Inc.
Ace Energy LLC
ACE Oil Company
Adeco, Inc.
Adelaide Energy LLC
Advantage Resources, Inc.
Aexco Petroleum, Inc.
Agape Service Incorporated
Agricultural Energy Services
AGV Corp.
Aiello Oil
Ainsworth Operating Co.
ALB, INC.
Albert R. Braun Oil Operations, LLC (Estate)
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Albert Thornbrough Trust
Aleo Oil Company, LLC
Alexander, Gary M.
Allam Production, Inc.
Alliance Energy LLC
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
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Anderson, Kendra A.
Anstine & Musgrove Inc.
Anstine Oil Company
AP Operating LLC
APEX Resources LLC
Apollo Energies, Inc.
Arbuckle, A. Dale & Kathryn E. Rev Trust
Arcadian Resources, LLC
ARDC INC.
Argent Energy (US) Holdings, Inc.
Armadilla Oil & Gas, LLC
Armor Petroleum, Inc.
ARP Operating, LLC
Arrowhead Exploration, LLC
Atlas Operating LLC
Audrey Oil & Gas LLC
Avalanche Oil & Gas LLC
Azkan Oil & Gas LLC
Aztec Oil Operating LLC
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