| 1 | Aaron & Jeter | Seminole, TX 79360 | Oil & Gas Operator | Jan 2003 |
| 2 | Accell Natural Gas Company | Houston, TX 77042 | Oil & Gas Operator | Sep 1998 |
| 3 | Acoma Operating, LLC | Lubbock, TX 79424 | Oil & Gas Operator | Oct 2025 |
| 4 | Adventure Exploration PTRS, LLC | Midland, TX 79702 | Oil & Gas Operator | Aug 2012 |
| 5 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 6 | Altura Energy LTD. | Houston, TX 77210 | Oil & Gas Operator | Apr 2000 |
| 7 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 8 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 9 | American Cometra, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2008 |
| 10 | American Energy Partners Inc | Boerne, TX 78006 | Oil & Gas Operator | Dec 2011 |
| 11 | American Energy-Perm Basin, LLC | Oklahoma City, OK 73113 | Oil & Gas Operator | May 2016 |
| 12 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 13 | Amistad Energy Services, LLC | Katy, TX 77450 | Oil & Gas Operator | Oct 2017 |
| 14 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 15 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 16 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 17 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jul 2025 |
| 18 | Anderson Energy Corporation | Arvada, CO 80004 | Oil & Gas Operator | Oct 2025 |
| 19 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 20 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 21 | Approach Operating LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Sep 2020 |
| 22 | Apv McCamey LLC | MC Camey, TX 79752 | Oil & Gas Operator | Oct 2025 |
| 23 | Aratex Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2003 |
| 24 | Araxas Exploration, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 1998 |
| 25 | Arch Oil & Gas, LLC | Dallas, TX 75254 | Oil & Gas Operator | Oct 2025 |
| 26 | Arco Permian | Houston, TX 77079 | Oil & Gas Operator | Dec 2001 |
| 27 | Arcotex Oil & Gas Inc | Gainesville, TX 76241-1357 | Oil & Gas Operator | Jul 2025 |
| 28 | Area Pipe And Equipment | Midland, TX 79702 | Oil & Gas Operator | Apr 2003 |
| 29 | Argee Oil Company | Midland, TX 79702 | Gas Operator | May 1994 |
| 30 | Arkoma Prod Co Of Texas, Inc. | Dallas, TX 75225 | Oil Operator | May 2004 |
| 31 | Arrington,David H. Oil & Gas,Inc | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 32 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 33 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Oct 2025 |
| 34 | Atropos Exploration Company | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 35 | Austin Production Company, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Mar 2015 |
| 36 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 37 | Avad Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 38 | Avra Oil Co | Dallas, TX 75248 | Oil & Gas Operator | Oct 2025 |