| 1 | A & A Oil Company | Luling, TX 78648 | Oil & Gas Operator | Oct 2009 |
| 2 | A.C.T. Operating Company | Lubbock, TX 79401 | Oil & Gas Operator | Mar 2025 |
| 3 | A2c Energy LLC | Houston, TX 77074 | Oil Operator | Mar 2025 |
| 4 | Abel, M.D. Co. | Lampasas, TX 76550 | Oil & Gas Operator | Jun 2017 |
| 5 | Ahabb Oil | Luling, TX 78648 | Oil & Gas Operator | Dec 1998 |
| 6 | All In Energy Production Corp. | Red Rock, TX 78662 | Oil Operator | Mar 2025 |
| 7 | Allen & Grace Oil Company | Kingsbury, TX 78638 | Oil & Gas Operator | Jul 1997 |
| 8 | Allied Operating Texas, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 9 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Mar 2025 |
| 10 | American Cascade Energy, Inc. | Barker, TX 77413 | Oil & Gas Operator | Mar 2025 |
| 11 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 12 | Arabie, Inc. | Lake Charles, LA 70605 | Oil & Gas Operator | Mar 2025 |
| 13 | Armidillo Oil Company | Luling, TX 78648 | Oil & Gas Operator | Mar 2025 |
| 14 | Arnold Oil Properties, L.L.C. | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 15 | Asante Operating Company, LLC | Austin, TX 78703 | Oil Operator | Mar 2025 |
| 16 | Austin Energy Operations, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Mar 2025 |
| 17 | Austin Operating, LLC. | Chicago, IL 60622 | Oil Operator | Mar 2025 |
| 18 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 19 | Avian Tech International, Inc. | Euless, TX 76040 | Oil & Gas Operator | Apr 1995 |
| 20 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Mar 2025 |