| 1 | A C Operating Co. | Bangs, TX 76823 | Oil & Gas Operator | Mar 2008 |
| 2 | A E G Oil, Inc. | Hale Center, TX 79041 | Oil & Gas Operator | Mar 2025 |
| 3 | A.E.N. Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Jan 1996 |
| 4 | Aberdeen Petroleum (USA) Inc. | Abilene, TX 79608 | Oil & Gas Operator | Sep 1994 |
| 5 | Abilene American Energy, LLC | Abilene, TX 79602 | Oil Operator | Mar 2025 |
| 6 | Adair Resources Inc. | Ennis, TX 75120 | Oil & Gas Operator | Apr 2018 |
| 7 | Adams Branch Exploration Company | Abilene, TX 79608 | Oil & Gas Operator | Jul 2002 |
| 8 | Advance Exploration | Abilene, TX 79601 | Oil & Gas Operator | Mar 2025 |
| 9 | Agroil, Inc. | Brownwood, TX 76801 | Oil & Gas Operator | Mar 2025 |
| 10 | Akers, B. F. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 11 | Alaron Energy, Inc. | Irving, TX 75038 | Oil & Gas Operator | Mar 2025 |
| 12 | Albany Well Service | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 13 | Alexander Resources, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 14 | Allegro Operating, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 15 | Allsop Oil And Gas Company, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Nov 1996 |
| 16 | Alpine Petroleum | Abilene, TX 79608 | Oil & Gas Operator | Jul 2018 |
| 17 | Alumni Oil LLC | Plano, TX 75024 | Oil Operator | Mar 2025 |
| 18 | American Energy | Abilene, TX 79604 | Oil & Gas Operator | Jul 2004 |
| 19 | American West | Burkett, TX 76828 | Oil & Gas Operator | Mar 2025 |
| 20 | Anderson, Roger W. Corp. | Clyde, TX 79510 | Oil & Gas Operator | Apr 2020 |
| 21 | Anejo Production, LLC | Electra, TX 76360 | Oil & Gas Operator | Mar 2025 |
| 22 | Aop Operating Corporation | Dallas, TX 75313 | Oil & Gas Operator | Aug 2003 |
| 23 | Arabie, Inc. | Lake Charles, LA 70605 | Oil & Gas Operator | Mar 2025 |
| 24 | Arben Oil, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Mar 2025 |
| 25 | Arcadian Mineral Development | Brownwood, TX 76801 | Oil & Gas Operator | Dec 2013 |
| 26 | Arcadian Mineral Development,LLC | Brownwood, TX 76801 | Oil & Gas Operator | Mar 2025 |
| 27 | Arch Petroleum Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2008 |
| 28 | Archer Petroleum | Frisco, TX 75034 | Oil & Gas Operator | Aug 2021 |
| 29 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 30 | Ark Petroleum Inc. | Clyde, TX 79510 | Oil & Gas Operator | Nov 1997 |
| 31 | Arleand Resources | Overton, TX 75684 | Oil & Gas Operator | Mar 2025 |
| 32 | Arnot Oil Company, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 33 | Arnot, W. G., Jr. | Breckenridge, TX 76424 | Oil & Gas Operator | Jan 2017 |
| 34 | Arrowhead Operating Inc. | Argyle, TX 76226 | Oil & Gas Operator | Mar 2025 |
| 35 | Astin Corp. | Dallas, TX 75229 | Oil & Gas Operator | Sep 1994 |
| 36 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 37 | Aurora Gas, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jan 2000 |
| 38 | Aurora Power Resources, Inc. | Houston, TX 77042 | Oil & Gas Operator | Aug 2018 |
| 39 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 40 | Aztec Drilling & Operating, LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2015 |