| 1 | Akers & Fultz, Inc. | Graham, TX 76450 | Oil & Gas Operator | Jun 2003 |
| 2 | Akers, B. F. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 3 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 4 | Allied Energy Operating, LLC | McKinney, TX 75071 | Oil Operator | Oct 2025 |
| 5 | Amen Oil LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 6 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 7 | Ameritech Oil & Gas Corporation | Dallas, TX 75248 | Oil & Gas Operator | May 1996 |
| 8 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jul 2025 |
| 9 | Anderson Production | Cisco, TX 76437 | Oil & Gas Operator | Oct 2025 |
| 10 | Anderson, E D | Cisco, TX 76437 | Oil & Gas Operator | Nov 2009 |
| 11 | Antle Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 12 | Antle, E. | Graham, TX 76450 | Oil & Gas Operator | Oct 1994 |
| 13 | Apexco, Inc. | Sand Springs, OK 74063 | Oil & Gas Operator | Mar 2025 |
| 14 | Aratex Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2003 |
| 15 | Arch Petroleum Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2008 |
| 16 | Arcooil Corp | San Antonio, TX 78205 | Oil & Gas Operator | Oct 2025 |
| 17 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 18 | Aries Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2010 |
| 19 | Arnot, W. G., Jr. | Breckenridge, TX 76424 | Oil & Gas Operator | Jan 2017 |
| 20 | Arrington,David H. Oil & Gas,Inc | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 21 | Ashtola Exploration Company,Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Oct 2025 |
| 22 | At Oil & Gas, LLC | Eastland, TX 76448 | Oil & Gas Operator | Oct 2025 |
| 23 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 24 | Atwa Energy Co. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 1996 |
| 25 | Atwell Technical Services, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 26 | Ausanka Oil Operations | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1995 |
| 27 | Avad Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 28 | Azul, Inc. | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 1995 |