| 1 | Abx Oil & Gas, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 2 | Adexco Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 3 | Adkins, Michael H. | Austin, TX 78747 | Oil & Gas Operator | Oct 2025 |
| 4 | Akers & Fultz, Inc. | Graham, TX 76450 | Oil & Gas Operator | Jun 2003 |
| 5 | Akers, B. F. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 6 | Albert, David Oil & Gas | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 7 | Albert-Bishop Exploration Co Inc | Dallas, TX 75240 | Oil & Gas Operator | Feb 2007 |
| 8 | Alpine Petroleum | Abilene, TX 79608 | Oil & Gas Operator | Jul 2018 |
| 9 | Amen Oil LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 10 | American West Resources, Inc | Fort Worth, TX 76161 | Oil & Gas Operator | Oct 2025 |
| 11 | Americo Energy Resources, LLC | Houston, TX 77063 | Oil & Gas Operator | Oct 2025 |
| 12 | Ameritech Oil & Gas Corporation | Dallas, TX 75248 | Oil & Gas Operator | May 1996 |
| 13 | Anderson Production | Cisco, TX 76437 | Oil & Gas Operator | Oct 2025 |
| 14 | Anderson, Carl T. | Wichita Falls, TX 76301 | Oil & Gas Operator | Feb 2014 |
| 15 | Anderson, E D | Cisco, TX 76437 | Oil & Gas Operator | Nov 2009 |
| 16 | Ando Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 1998 |
| 17 | Antle Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 18 | Archer Petroleum | Frisco, TX 75034 | Oil & Gas Operator | Aug 2021 |
| 19 | Arledge & Young, Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Feb 1999 |
| 20 | Arnot Oil Company, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 21 | Arnot, W. G., Jr. | Breckenridge, TX 76424 | Oil & Gas Operator | Jan 2017 |
| 22 | Arrowhead Productions, LP | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2025 |
| 23 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 24 | Aspect Abundant Shale LP | Denver, CO 80203 | Oil & Gas Operator | Nov 2012 |
| 25 | Assent Energy Partners, LLC | College Sta, TX 77840 | Oil & Gas Operator | Oct 2025 |
| 26 | Athena Resources, Inc. | Dallas, TX 75248 | Oil & Gas Operator | Oct 2025 |
| 27 | Atlas Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 28 | Atoka Operating, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Oct 2025 |
| 29 | Ausanka Oil Operations | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1995 |
| 30 | Austex Energy, Inc. | Granbury, TX 76048 | Oil & Gas Operator | Apr 1993 |
| 31 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |