| 1 | Acock Operating Limited | San Antonio, TX 78270 | Oil & Gas Operator | Oct 2025 |
| 2 | Ada Belle Oil & Gas Company | Sourlake, TX 77659 | Oil Operator | Dec 2023 |
| 3 | Aj'S Pump Truck Service, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Oct 2025 |
| 4 | Alaron Energy, Inc. | Irving, TX 75038 | Oil & Gas Operator | Oct 2025 |
| 5 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Oct 2025 |
| 6 | Allegro Investments, Inc. | Victoria, TX 77903 | Oil & Gas Operator | Nov 2020 |
| 7 | Alltex Exploration, Inc. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 8 | Alpine Exploration Co, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Nov 2017 |
| 9 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 10 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Oct 2025 |
| 11 | Altex Resources, Inc. | Carney, OK 74832 | Oil & Gas Operator | Mar 2015 |
| 12 | Ambrit Energy Corporation | Garland, TX 75044 | Oil & Gas Operator | Jun 2003 |
| 13 | Amend Energy Company | Houston, TX 77227 | Oil & Gas Operator | Apr 2002 |
| 14 | American Cascade Energy, Inc. | Barker, TX 77413 | Oil & Gas Operator | Oct 2025 |
| 15 | American Cometra, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2008 |
| 16 | American Energy Op. Corp.,The | Houston, TX 77099 | Oil & Gas Operator | Oct 2025 |
| 17 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jul 2025 |
| 18 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 19 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 20 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 21 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 22 | Apb Oil Corporation | Houston, TX 77052 | Oil & Gas Operator | Apr 1996 |
| 23 | Arcadia Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Oct 2025 |
| 24 | Arco Oil & Gas Co.-Silsbee | Lafayette, LA 70505 | Oil & Gas Operator | Jul 1993 |
| 25 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 26 | Arista Novelty, Inc. | Houston, TX 77256 | Oil & Gas Operator | Feb 1995 |
| 27 | Arrowhead Operating Inc. | Argyle, TX 76226 | Oil & Gas Operator | Oct 2025 |
| 28 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 29 | Aspect Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 30 | Atapco | Houston, TX 77040 | Oil & Gas Operator | Feb 1999 |
| 31 | Atp Oil & Gas Corporation | Houston, TX 77027 | Oil & Gas Operator | Jun 2008 |
| 32 | Auden Oil Inc. | Hardin, TX 77561 | Oil Operator | Oct 2025 |
| 33 | Austin Energy Operations, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Oct 2025 |
| 34 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 35 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Oct 2025 |