| 1 | Aaronmark Services, LLC | New Braunfels, TX 78130 | Oil Operator | Oct 2025 |
| 2 | Abernathy Auto, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 3 | Acock Engineering & Assoc., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2002 |
| 4 | Acock Operating Limited | San Antonio, TX 78270 | Oil & Gas Operator | Oct 2025 |
| 5 | Acorn Oil & Gas, Inc. | Orchard, TX 77464 | Oil Operator | Sep 2017 |
| 6 | Activa Resources, LLC | San Antonio, TX 78205 | Oil & Gas Operator | Oct 2025 |
| 7 | Agape Energy Inc. | San Antonio, TX 78280 | Oil Operator | Oct 2025 |
| 8 | Ageron Energy, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Oct 2025 |
| 9 | Alamo Operating Company, L. C. | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2023 |
| 10 | Alaron Energy, Inc. | Irving, TX 75038 | Oil & Gas Operator | Oct 2025 |
| 11 | Alco DRLG. Co. | Freer, TX 78357 | Oil & Gas Operator | Oct 2025 |
| 12 | Altair Energy Corp. | Tyler, TX 75702 | Oil & Gas Operator | Jun 1994 |
| 13 | Alvarado 2014 LLC | Houston, TX 77027 | Oil & Gas Operator | Oct 2025 |
| 14 | Amac Energy, L.L.C. | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 15 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 16 | Ambassador Petroleum, Inc. | Katy, TX 77494 | Oil & Gas Operator | Oct 2025 |
| 17 | Amcon Resources, Inc. | Oklahoma City, OK 73101 | Gas Operator | Jun 2016 |
| 18 | American Eagle Resources, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 19 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | Oct 2025 |
| 20 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 21 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jul 2025 |
| 22 | Aop Operating Corporation | Dallas, TX 75313 | Oil & Gas Operator | Aug 2003 |
| 23 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 24 | Arcadia Expl. & Prod. Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2011 |
| 25 | Arete Operating Company, LLC | San Antonio, TX 78260 | Oil & Gas Operator | Oct 2025 |
| 26 | Arpel, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2014 |
| 27 | Arrco Operating, LLC | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Oct 2025 |
| 28 | Arrow Exploration Company | Plano, TX 75075 | Oil & Gas Operator | Dec 2004 |
| 29 | Ashby, Andrew M. | Golden, CO 80401 | Oil & Gas Operator | Jul 1998 |
| 30 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 31 | Ashtola Exploration Company,Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Oct 2025 |
| 32 | Atlas Energy Corporation (Del.) | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2025 |
| 33 | Auburn Enterprises, Inc. | Kyle, TX 78640 | Oil & Gas Operator | Aug 2003 |
| 34 | Av-Tech Resources Corporation | Kerrville, TX 78028 | Oil & Gas Operator | Jul 2022 |
| 35 | Avighna Energy Inc | Sugar Land, TX 77487 | Oil & Gas Operator | Jan 2019 |
| 36 | Awp Operating Company | George West, TX 78022 | Oil & Gas Operator | Oct 2025 |
| 37 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Oct 2025 |