| 1001 | Amsito Oil Company LLC | Denton, TX 76206-0689 | Oil Operator | Apr 2001 |
| 1002 | Amsler Jerry & Denese | Enid, OK 73703-9300 | Oil & Gas Operator | Jul 2020 |
| 1003 | Amt Resources, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Aug 2025 |
| 1004 | Amtech Energy Inc | Plymouth, IL 62367-1016 | Oil & Gas Operator | Dec 2021 |
| 1005 | Amtex Energy | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 1006 | Amtex Energy, Inc. | Fort Worth, TX 76147 | Oil & Gas Operator | Aug 2025 |
| 1007 | Amtex Oil & Gas Inc | Canton, OH 44711 | Oil & Gas Operator | Dec 2004 |
| 1008 | Amtuck Oil | Logan, OH 43138 | Oil & Gas Operator | Dec 2010 |
| 1009 | Amvest Osage Inc | Skiatook, OK 74070-0970 | Oil & Gas Operator | May 2025 |
| 1010 | Amwes Exploration, LLC | Barbourville, KY 40906 | Oil & Gas Operator | Dec 2023 |
| 1011 | Amx Energy, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Aug 2025 |
| 1012 | An-Car Oil Co, Inc | Owensboro, KY 42302-1329 | Oil & Gas Operator | Dec 2014 |
| 1013 | An-Son Corporation | Oklahoma City, OK 73124 | Oil & Gas Operator | Jan 2006 |
| 1014 | Anabaco Operating Company | Stillwater, OK 74076-1958 | Oil & Gas Operator | Mar 2014 |
| 1015 | Anacapa Oil Corporation | | Gas Operator | May 2025 |
| 1016 | Anadarko Austin Chalk Company | Houston, TX 77251 | Oil & Gas Operator | Feb 2006 |
| 1017 | Anadarko Basin Oil& Gas Lease Inc | Sayre, OK 73662 | Oil & Gas Operator | Jan 1997 |
| 1018 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 1019 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Aug 2025 |
| 1020 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2025 |
| 1021 | Anadarko Ogc Company | Houston, TX 77251 | Oil & Gas Operator | Dec 1998 |
| 1022 | Anadarko Petrole | | Oil & Gas Operator | Dec 1996 |
| 1023 | Anadarko Petroleum | | Oil & Gas Operator | Oct 2007 |
| 1024 | Anadarko Petroleum Co | Houston, TX 77227 | Oil & Gas Operator | Feb 1998 |
| 1025 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jun 2025 |
| 1026 | Anadarko Prod | | Oil & Gas Operator | Dec 1996 |
| 1027 | Anadarko Production Co. | | Oil Operator | Feb 1989 |
| 1028 | Anadime Energy Services Inc. | | Oil & Gas Operator | Dec 2009 |
| 1029 | Analena Corporation | Dallas, TX 75251 | Oil Operator | Jun 2000 |
| 1030 | Ananda Energy Inc. | Pampa, TX 79065 | Oil & Gas Operator | Jan 2021 |
| 1031 | Anaqua Oil & Gas, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2008 |
| 1032 | Anatexas Offshore, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2025 |
| 1033 | Anathema, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Dec 1994 |
| 1034 | Anc Investments LLC | Enid, OK 73701-1823 | Gas Operator | May 2025 |
| 1035 | Ancell Oil Co. | Wichita Falls, TX 76309 | Oil & Gas Operator | Dec 2018 |
| 1036 | Anchor B Production, Inc. | Orla, TX 79770 | Oil & Gas Operator | Aug 2003 |
| 1037 | Anchor Bay Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2007 |
| 1038 | Anchor Bay Petroleum | Hays, KS 67601 | Oil Operator | Apr 2025 |
| 1039 | Anchor Bay Petroleum LLC | Hays, KS 67601 | Oil Operator | Apr 2025 |
| 1040 | Anchor Oil Company | Gruver, TX 79040 | Gas Operator | Aug 2025 |
| 1041 | Anchor Operating Co. | Houston, TX 77055 | Oil & Gas Operator | Aug 2025 |
| 1042 | Anchor Petroleum, Inc. | Lubbock, TX 79464 | Oil & Gas Operator | Jan 1996 |
| 1043 | Anchorage Oil & Gas Inc | Oklahoma City, OK 73128-1422 | Oil & Gas Operator | Oct 1999 |
| 1044 | Ancient Sands Inc | Kittanning, PA 16201-0916 | Oil & Gas Operator | Dec 2008 |
| 1045 | Anco Account | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 1995 |
| 1046 | Ancora-Verde Corporation | | Oil & Gas Operator | Dec 2004 |
| 1047 | Andalucia Oil Company | San Antonio, TX 78258 | Oil Operator | Aug 2025 |
| 1048 | Andco Mud Inc | Edmond, OK 73034-3910 | Oil & Gas Operator | Mar 2006 |
| 1049 | Andector Exploration Company | Midland, TX 79702 | Oil & Gas Operator | Aug 2025 |
| 1050 | Anderman/Smith Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1995 |
| 1051 | Anderson Art Tan | | Oil Operator | Jul 1988 |
| 1052 | Anderson Bobby B | Fleming, OH 45729 | Oil & Gas Operator | Dec 2024 |
| 1053 | Anderson Energy Corporation | Arvada, CO 80004 | Oil & Gas Operator | Aug 2025 |
| 1054 | Anderson Energy SVC LLC | Clarendon, PA 16313-4238 | Oil & Gas Operator | Dec 2024 |
| 1055 | Anderson Energy, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Apr 2025 |
| 1056 | Anderson Exploration Co., Inc. | | Oil & Gas Operator | Sep 2023 |
| 1057 | Anderson Floyd Melton Revocable Trust | Yukon, OK 73099 | Oil & Gas Operator | Oct 2024 |
| 1058 | Anderson Jerry W | Bartlesville, OK 74006-0178 | Oil Operator | Dec 2022 |
| 1059 | Anderson Kent | | Oil Operator | Dec 2009 |
| 1060 | Anderson Management Company | Gillette, WY 82716 | Oil & Gas Operator | May 2016 |
| 1061 | Anderson Oil & Gas Account | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2013 |
| 1062 | Anderson Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2015 |
| 1063 | Anderson Oil Corporation | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Nov 1999 |
| 1064 | Anderson Oil LTD. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 2025 |
| 1065 | Anderson Oil LTD.,LLP | Farmington, NM 87499 | Oil & Gas Operator | Jun 2025 |
| 1066 | Anderson Operating LLC Of Mississippi | | Oil & Gas Operator | Jul 2018 |
| 1067 | Anderson Petro-Equipment, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | Aug 2025 |
| 1068 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 1069 | Anderson Production | Cisco, TX 76437 | Oil & Gas Operator | Aug 2025 |
| 1070 | Anderson Robert C Estate | San Diego, CA 92109 | Oil & Gas Operator | Jul 1994 |
| 1071 | Anderson T Maxwell | Tulsa, OK 74136-0653 | Oil & Gas Operator | Dec 2013 |
| 1072 | Anderson Thornto | | Oil & Gas Operator | Mar 1995 |
| 1073 | Anderson, Allen M | Fleming, OH 45729 | Oil & Gas Operator | Dec 2023 |
| 1074 | Anderson, Arden A. | | Oil & Gas Operator | Jun 1970 |
| 1075 | Anderson, Carl T. | Wichita Falls, TX 76301 | Oil & Gas Operator | Feb 2014 |
| 1076 | Anderson, Dorman | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2012 |
| 1077 | Anderson, E D | Cisco, TX 76437 | Oil & Gas Operator | Nov 2009 |
| 1078 | Anderson, James K. Inc. | Abilene, TX 79608 | Oil & Gas Operator | Aug 2025 |
| 1079 | Anderson, James S. | Sinclairville, NY 14782 | Gas Operator | Dec 2024 |
| 1080 | Anderson, Jerry | Floydada, TX 79235 | Oil & Gas Operator | Apr 2025 |
| 1081 | Anderson, Kendra A. | Galva, KS 67443 | Oil Operator | Apr 2025 |
| 1082 | Anderson, Kyle K. | Concord, NY 14055 | Gas Operator | Dec 2024 |
| 1083 | Anderson, Roger W. Corp. | Clyde, TX 79510 | Oil & Gas Operator | Apr 2020 |
| 1084 | Anderson, Steven C. | Victoria, TX 77902 | Gas Operator | Jun 2004 |
| 1085 | Ando Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 1998 |
| 1086 | Andover Oil Comp | | Oil & Gas Operator | Oct 1989 |
| 1087 | Andover Oil Company | | Oil Operator | Sep 1982 |
| 1088 | Andrea Operating Company | Edmond, OK 73013-6627 | Oil & Gas Operator | May 2025 |
| 1089 | Andress Bill O | Tulsa, OK 74135-3553 | Oil & Gas Operator | Sep 2003 |
| 1090 | Andrew Alan Exploration, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2017 |
| 1091 | Andrew L. Newkirk | | Oil Operator | May 2025 |
| 1092 | Andrew, Robert Oneal | Olney, TX 76374 | Oil & Gas Operator | Sep 1998 |
| 1093 | Andrews & Corkran, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Feb 2000 |
| 1094 | Andrews, B. C. | Graham, TX 76450 | Oil & Gas Operator | Aug 2025 |
| 1095 | Andries Oil Company | | Oil Operator | Jan 2025 |
| 1096 | Andrikopoulos A G | Cheyenne, WY 82009 | Oil & Gas Operator | Dec 1994 |
| 1097 | Andrikopoulos Resources* A G | | Oil & Gas Operator | Jul 2015 |
| 1098 | Andrus Resources Corporation | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |
| 1099 | Anegada Energy LLC | Canonsburg, PA 15317-0400 | Gas Operator | May 2025 |
| 1100 | Anegada Resources | Kerrville, TX 78029 | Oil & Gas Operator | Jan 2002 |