| 1001 | Amherst Energy Holdings, LLC | Highland VLG, TX 75077 | Oil Operator | Feb 2026 |
| 1002 | Aminex USA, Inc. | Somerset, TX 78069 | Oil & Gas Operator | May 2018 |
| 1003 | Aminoil Of Louisiana, Inc. | | Oil & Gas Operator | Dec 1981 |
| 1004 | Aminoil USA Inc | | Oil & Gas Operator | Jan 1985 |
| 1005 | Amirmex Inc. | Denver, CO 80234 | Oil & Gas Operator | Feb 2026 |
| 1006 | Amistad Energy Services, LLC | Katy, TX 77450 | Oil & Gas Operator | Oct 2017 |
| 1007 | Amity Oil Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 1977 |
| 1008 | Amkay Petroleum Co., Inc. | | Oil Operator | Dec 1991 |
| 1009 | Ammo Energy, LLC | Oklahoma City, OK 73160 | Oil & Gas Operator | Feb 2009 |
| 1010 | Ammonite Energy Texas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Aug 2003 |
| 1011 | Ammons, Dean E | | Oil Operator | Jan 2021 |
| 1012 | Amoco Prod Co-Banner Pet LTD | | Oil & Gas Operator | Mar 1981 |
| 1013 | Amoco Production | | Oil & Gas Operator | Jun 2012 |
| 1014 | Amoco Production Co And C M S Oil And Gas | | Oil Operator | Sep 1996 |
| 1015 | Amoco Production Co And Peninsular Oil And Gas Co | | Oil Operator | Sep 1998 |
| 1016 | Amoco Production Co-Ratliff City | Ratliff City, OK 73081 | Oil Operator | May 1998 |
| 1017 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 1018 | Amoco Rocmount Company | Denver, CO 80201 | Oil & Gas Operator | Jan 1998 |
| 1019 | Amos Zittel & Sons, Inc. | Eden, NY 14057 | Gas Operator | Dec 2024 |
| 1020 | Amos, Joe | Wichita, KS 67233 | Oil Operator | Jul 1990 |
| 1021 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | Feb 2026 |
| 1022 | Ample Resources Inc. | | Oil & Gas Operator | Dec 2025 |
| 1023 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 1024 | Amplify Oklahoma Operating LLC | Houston, TX 77002-4800 | Oil & Gas Operator | Nov 2025 |
| 1025 | Ampolex (Texas), Inc. | | Oil & Gas Operator | May 1993 |
| 1026 | Ampolex Wy Inc | Gillette, WY 82716 | Oil & Gas Operator | Mar 1997 |
| 1027 | Amreco, LLC | El Dorado, AR 71730 | Oil Operator | Jan 2025 |
| 1028 | Amrich Energy Inc. | | Oil & Gas Operator | Nov 2025 |
| 1029 | Amron Petroleum, Inc. | Midland, TX 79708 | Oil & Gas Operator | Jan 1996 |
| 1030 | Ams Energy LLC | Herman, PA 16039-0156 | Oil & Gas Operator | Dec 2025 |
| 1031 | Ams Energy Solutions LLP | Katy, TX 77493 | Oil Operator | Feb 2026 |
| 1032 | Amsito Oil Company LLC | Denton, TX 76206-0689 | Oil Operator | Apr 2001 |
| 1033 | Amsler Jerry & Denese | Enid, OK 73703-9300 | Oil & Gas Operator | Jul 2020 |
| 1034 | Amt Resources, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Feb 2026 |
| 1035 | Amtech Energy Inc | Plymouth, IL 62367-1016 | Oil & Gas Operator | Dec 2021 |
| 1036 | Amtex Energy | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 1037 | Amtex Energy, Inc. | Fort Worth, TX 76147 | Oil & Gas Operator | Feb 2026 |
| 1038 | Amtex Oil & Gas Inc | Canton, OH 44711 | Oil & Gas Operator | Dec 2004 |
| 1039 | Amtuck Oil | Logan, OH 43138 | Oil & Gas Operator | Dec 2010 |
| 1040 | Amvest Osage Inc | Skiatook, OK 74070-0970 | Oil & Gas Operator | Nov 2025 |
| 1041 | Amwes Exploration, LLC | Barbourville, KY 40906 | Oil & Gas Operator | Dec 2023 |
| 1042 | Amx Energy, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Feb 2026 |
| 1043 | An-Car Oil Co Inc | Owensboro, KY 42302-1329 | Oil & Gas Operator | Dec 2014 |
| 1044 | An-Son Corp | Oklahoma City, OK 73124 | Oil & Gas Operator | Jan 2006 |
| 1045 | Ana-Tok Operating Co., Inc. | Pampa, TX 79066 | Oil & Gas Operator | Jun 2001 |
| 1046 | Anabaco Operating Company | Stillwater, OK 74076-1958 | Oil & Gas Operator | Mar 2014 |
| 1047 | Anacapa Oil Corporation | | Gas Operator | Nov 2025 |
| 1048 | Anaconda DRLG Of Kentucky, LLC | | Gas Operator | Dec 2011 |
| 1049 | Anadarko Austin Chalk Company | Houston, TX 77251 | Oil & Gas Operator | Feb 2006 |
| 1050 | Anadarko Basin Oil& Gas Lease Inc | Sayre, OK 73662 | Oil & Gas Operator | Jan 1997 |
| 1051 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 1052 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 1053 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 1054 | Anadarko Ogc Company | Houston, TX 77251 | Oil & Gas Operator | Dec 1998 |
| 1055 | Anadarko Petrole | | Oil & Gas Operator | Dec 1996 |
| 1056 | Anadarko Petroleum | | Oil & Gas Operator | Oct 2007 |
| 1057 | Anadarko Petroleum Co | Houston, TX 77227 | Oil & Gas Operator | Feb 1998 |
| 1058 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Dec 2025 |
| 1059 | Anadarko Prod | | Oil & Gas Operator | Dec 1996 |
| 1060 | Anadarko Production Co. | | Oil Operator | Feb 1989 |
| 1061 | Anadime Energy Services Inc. | | Oil & Gas Operator | Dec 2009 |
| 1062 | Analena Corporation | Dallas, TX 75251 | Oil Operator | Jun 2000 |
| 1063 | Ananda Energy Inc. | Pampa, TX 79065 | Oil & Gas Operator | Jan 2021 |
| 1064 | Anaqua Oil & Gas, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2008 |
| 1065 | Anatexas Offshore, Inc. | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 1066 | Anathema, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Dec 1994 |
| 1067 | Anc Investments LLC | Enid, OK 73701-1823 | Gas Operator | Nov 2025 |
| 1068 | Ancell Oil Co. | Wichita Falls, TX 76309 | Oil & Gas Operator | Dec 2018 |
| 1069 | Anchor B Production, Inc. | Orla, TX 79770 | Oil & Gas Operator | Aug 2003 |
| 1070 | Anchor Bay Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2007 |
| 1071 | Anchor Bay Petroleum | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 1072 | Anchor Bay Petroleum LLC | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 1073 | Anchor Oil Company | Gruver, TX 79040 | Gas Operator | Feb 2026 |
| 1074 | Anchor Operating Co. | Houston, TX 77055 | Oil & Gas Operator | Feb 2026 |
| 1075 | Anchor Petroleum, Inc. | Lubbock, TX 79464 | Oil & Gas Operator | Jan 1996 |
| 1076 | Anchorage Oil & Gas Inc | Oklahoma City, OK 73128-1422 | Oil & Gas Operator | Oct 1999 |
| 1077 | Ancient Sands Inc | Kittanning, PA 16201-0916 | Oil & Gas Operator | Dec 2008 |
| 1078 | Anco Account | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 1995 |
| 1079 | Ancora-Verde Corporation | | Oil & Gas Operator | Dec 2004 |
| 1080 | Andalucia Oil Company | San Antonio, TX 78258 | Oil Operator | Feb 2026 |
| 1081 | Andco Mud Inc | Edmond, OK 73034-3910 | Oil & Gas Operator | Mar 2006 |
| 1082 | Andco Oil | Pampa, TX 79066 | Oil & Gas Operator | Oct 1994 |
| 1083 | Andector Exploration Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 1084 | Anderman/Smith Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1995 |
| 1085 | Anderson Art Tan | | Oil Operator | Jul 1988 |
| 1086 | Anderson Bobby B | Fleming, OH 45729 | Oil & Gas Operator | Dec 2024 |
| 1087 | Anderson Energy Corporation | Arvada, CO 80004 | Oil & Gas Operator | Feb 2026 |
| 1088 | Anderson Energy Inc | Wichita, KS 67278 | Oil & Gas Operator | Sep 2025 |
| 1089 | Anderson Energy SVC LLC | Clarendon, PA 16313-4238 | Oil & Gas Operator | Dec 2025 |
| 1090 | Anderson Exploration Co., Inc. | | Oil & Gas Operator | Sep 2023 |
| 1091 | Anderson Floyd Melton Revocable Trust | Yukon, OK 73099 | Oil & Gas Operator | Oct 2024 |
| 1092 | Anderson Jerry W | Bartlesville, OK 74006-0178 | Oil Operator | Dec 2022 |
| 1093 | Anderson Kent | | Oil Operator | Dec 2009 |
| 1094 | Anderson Management Company | Gillette, WY 82716 | Oil & Gas Operator | May 2016 |
| 1095 | Anderson Oil & Gas Account | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2013 |
| 1096 | Anderson Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2015 |
| 1097 | Anderson Oil Corporation | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Nov 1999 |
| 1098 | Anderson Oil LTD. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 1099 | Anderson Oil LTD.,LLP | Farmington, NM 87499 | Oil & Gas Operator | Dec 2025 |
| 1100 | Anderson Operating LLC Of Mississippi | | Oil & Gas Operator | Jul 2018 |