| 1 | Abaco Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2026 |
| 2 | Acock Engineering & Assoc., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2002 |
| 3 | Acock/Anaqua Operating Co., LC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2004 |
| 4 | Advantage Oil & Gas, Inc. | Pinehurst, TX 77362 | Oil & Gas Operator | Feb 2026 |
| 5 | Aegis Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Sep 1998 |
| 6 | Agp Energy Services LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 7 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 8 | Anderson Oil Corporation | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Nov 1999 |
| 9 | Anderson Oil LTD. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 10 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Feb 2026 |
| 11 | Argent Energy (Us) Holdings Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Sep 2021 |
| 12 | Ascent Operating, LP | Plano, TX 75093 | Oil & Gas Operator | Aug 2008 |
| 13 | Associated Operating & Explor. | Dallas, TX 75243 | Oil & Gas Operator | Feb 2026 |
| 14 | Atasca Resources, Inc. | Houston, TX 77219 | Oil & Gas Operator | Feb 2026 |
| 15 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 16 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 17 | Atropos Exploration Company | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 18 | Aurora Resources Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 19 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 20 | Awp Operating Company | George West, TX 78022 | Oil & Gas Operator | Feb 2026 |