| 1 | A A Production Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 1998 |
| 2 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Oct 2025 |
| 3 | Abraxas Production Corporation | San Antonio, TX 78270 | Oil & Gas Operator | Sep 1999 |
| 4 | Ackerly Service Company, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Nov 1997 |
| 5 | Acoma Oil Corporation | Saint Paul, MN 55102 | Oil & Gas Operator | Oct 2025 |
| 6 | Adkins, R. L. Corp. | Lubbock, TX 79408 | Oil & Gas Operator | Jun 2013 |
| 7 | Aethon I LP | Dallas, TX 75206 | Oil & Gas Operator | Mar 2015 |
| 8 | Aladdin Energy, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Feb 1999 |
| 9 | Alleder Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 10 | Allegro Operating, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 11 | Alta Energy Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1995 |
| 12 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 13 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 14 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 15 | Americo Energy Resources, LLC | Houston, TX 77063 | Oil & Gas Operator | Oct 2025 |
| 16 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 17 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jul 2025 |
| 18 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 19 | Apc Operating Partnership | Tulsa, OK 74136 | Oil & Gas Operator | Oct 1996 |
| 20 | Apex Resources LLC | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 21 | Apv McCamey LLC | MC Camey, TX 79752 | Oil & Gas Operator | Oct 2025 |
| 22 | Arch Oil & Gas, LLC | Dallas, TX 75254 | Oil & Gas Operator | Oct 2025 |
| 23 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 24 | Area Pipe And Equipment | Midland, TX 79702 | Oil & Gas Operator | Apr 2003 |
| 25 | Arkland Producing Co Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2023 |
| 26 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 27 | Arya Resources, LLC | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 28 | Atapco | Houston, TX 77040 | Oil & Gas Operator | Feb 1999 |
| 29 | Athlon Energy Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 30 | Athlon Fe Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2015 |
| 31 | Athlon Holdings LP | Denver, CO 80202 | Oil & Gas Operator | Jan 2015 |
| 32 | Atropos Production Corporation | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 33 | Autumn Energy Operating | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |