| 1 | A.E.N. Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Jan 1996 |
| 2 | Acco Oil & Gas Company | Houston, TX 77056 | Oil & Gas Operator | Sep 2001 |
| 3 | Acierto Resources Company, LLC | Houston, TX 77070 | Oil & Gas Operator | Oct 2025 |
| 4 | Alamo Operating Company, L. C. | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2023 |
| 5 | Alaron Energy, Inc. | Irving, TX 75038 | Oil & Gas Operator | Oct 2025 |
| 6 | Albemarle Corporation | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 7 | Alexander, John | Pearland, TX 77588 | Oil & Gas Operator | Oct 2025 |
| 8 | Allied-Gulf Energy, LLC | Lafayette, LA 70508 | Oil & Gas Operator | Oct 2025 |
| 9 | Amazon Royalties, Inc. | Fulshear, TX 77441 | Oil & Gas Operator | Oct 2025 |
| 10 | Ambrit Energy Corporation | Garland, TX 75044 | Oil & Gas Operator | Jun 2003 |
| 11 | Amend Energy Company | Houston, TX 77227 | Oil & Gas Operator | Apr 2002 |
| 12 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 13 | American Energy Op. Corp.,The | Houston, TX 77099 | Oil & Gas Operator | Oct 2025 |
| 14 | American Energy Sources, Inc. | Spring, TX 77388 | Oil & Gas Operator | Dec 2008 |
| 15 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 16 | Americo Energy Resources, LLC | Houston, TX 77063 | Oil & Gas Operator | Oct 2025 |
| 17 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 18 | Anderson Petro-Equipment, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | Oct 2025 |
| 19 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 20 | Anloc, LLC | Houston, TX 77024 | Oil & Gas Operator | Apr 2019 |
| 21 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 22 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 23 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 24 | Arista Novelty, Inc. | Houston, TX 77256 | Oil & Gas Operator | Feb 1995 |
| 25 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 26 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Oct 2025 |
| 27 | Atropos Exploration Company | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 28 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Oct 2025 |