| 1 | A - Z Operating LLC | Winters, TX 79567 | Oil Operator | Feb 2026 |
| 2 | A. P. B. Petro | Winters, TX 79567 | Oil & Gas Operator | Oct 2005 |
| 3 | A.A.F. Production Co., Inc. | Abilene, TX 79606 | Oil & Gas Operator | Dec 1997 |
| 4 | Abilene American Energy, LLC | Abilene, TX 79602 | Oil Operator | Feb 2026 |
| 5 | Abtex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | May 2006 |
| 6 | Activa Resources, LLC | San Antonio, TX 78205 | Oil & Gas Operator | Feb 2026 |
| 7 | Adams Branch Exploration Company | Abilene, TX 79608 | Oil & Gas Operator | Jul 2002 |
| 8 | Alaron Energy, Inc. | Irving, TX 75038 | Oil & Gas Operator | Feb 2026 |
| 9 | Alexander Resources, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 10 | All-Southwest Petroleum, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Oct 1997 |
| 11 | Allegro Investments, Inc. | Victoria, TX 77903 | Oil & Gas Operator | Nov 2020 |
| 12 | Allegro Operating, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 13 | Alpine Gas Company, LLC | Dallas, TX 75201 | Oil & Gas Operator | Oct 2006 |
| 14 | Alumni Oil LLC | Plano, TX 75024 | Oil Operator | Feb 2026 |
| 15 | American Cascade Energy, Inc. | Barker, TX 77413 | Oil & Gas Operator | Feb 2026 |
| 16 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | Feb 2026 |
| 17 | Anadarko Ogc Company | Houston, TX 77251 | Oil & Gas Operator | Dec 1998 |
| 18 | Anderson, James K. Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 19 | Arben Oil, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Feb 2026 |
| 20 | Arcadian Mineral Development,LLC | Brownwood, TX 76801 | Oil & Gas Operator | Feb 2026 |
| 21 | Atapco | Houston, TX 77040 | Oil & Gas Operator | Feb 1999 |
| 22 | Atf Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 23 | Atlantic Richfield Company | Houston, TX 77079 | Oil & Gas Operator | Dec 2016 |
| 24 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 25 | Atmos Pipeline - Texas | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 26 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 27 | Avips Petroleum, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Jun 1996 |
| 28 | Azul, Inc. | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 1995 |