| 1 | Aaronmark Services, LLC | New Braunfels, TX 78130 | Oil Operator | Apr 2024 |
| 2 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Apr 2024 |
| 3 | Abraxas Production Corporation | San Antonio, TX 78270 | Oil & Gas Operator | Sep 1999 |
| 4 | Acock Engineering & Assoc., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2002 |
| 5 | Acock/Anaqua Operating Co., LC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2004 |
| 6 | Acock/Anaqua Operating Co., LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 7 | Activa Resources, LLC | San Antonio, TX 78205 | Oil & Gas Operator | Apr 2024 |
| 8 | Agape Energy Inc. | San Antonio, TX 78280 | Oil Operator | Apr 2024 |
| 9 | Alcor Energy, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Apr 2024 |
| 10 | Allegro Investments, Inc. | Victoria, TX 77903 | Oil & Gas Operator | Nov 2020 |
| 11 | Allen & Shumate, Inc. | Alice, TX 78333 | Oil & Gas Operator | Jan 1996 |
| 12 | Alvarado 2014 LLC | Houston, TX 77027 | Oil & Gas Operator | Apr 2024 |
| 13 | American Coastal Energy, Inc. | Houston, TX 77225 | Oil & Gas Operator | May 2008 |
| 14 | American Cometra, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2008 |
| 15 | American Eagle Resources, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2024 |
| 16 | Americo Energy Resources, LLC | Houston, TX 77063 | Oil & Gas Operator | Apr 2024 |
| 17 | Aminex USA, Inc. | Somerset, TX 78069 | Oil & Gas Operator | May 2018 |
| 18 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 19 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | Apr 2024 |
| 20 | Anaqua Oil & Gas, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2008 |
| 21 | Andrews & Corkran, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Feb 2000 |
| 22 | Aop Operating Corporation | Dallas, TX 75313 | Oil & Gas Operator | Aug 2003 |
| 23 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 24 | Arabie, Inc. | Lake Charles, LA 70605 | Oil & Gas Operator | Apr 2024 |
| 25 | Arben Oil, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Apr 2024 |
| 26 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 27 | Argent Energy (Us) Holdings Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Feb 2023 |
| 28 | Arrow S Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 29 | Ashby, Andrew M. | Golden, CO 80401 | Oil & Gas Operator | Jul 1998 |
| 30 | Atascosa Exploration, LLC | San Antonio, TX 78209 | Oil Operator | Apr 2020 |
| 31 | Atlas Eagle Ford Oper Co, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | May 2020 |
| 32 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 33 | Atnipp, H. L. | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 34 | Aurora USA Development, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2014 |
| 35 | Avighna Energy Inc | Sugar Land, TX 77487 | Oil & Gas Operator | Jan 2019 |
| 36 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Apr 2024 |