| 1 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Apr 2025 |
| 2 | Adams Resources Expl. Corp. | Houston, TX 77001 | Oil & Gas Operator | Apr 2020 |
| 3 | All Around Distribution, Inc. | Stephenville, TX 76401 | Oil Operator | Apr 2025 |
| 4 | Allied Energy Operating, LLC | McKinney, TX 75070 | Oil Operator | Apr 2025 |
| 5 | Altura Energy LTD. | Houston, TX 77210 | Oil & Gas Operator | Apr 2000 |
| 6 | Anadarko Austin Chalk Company | Houston, TX 77251 | Oil & Gas Operator | Feb 2006 |
| 7 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 8 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2025 |
| 9 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 10 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Apr 2025 |
| 11 | Apex Resources Inc | Allison Park, PA 15101-3838 | Oil & Gas Operator | Dec 1993 |
| 12 | Arcturus Operating Company | Addison, TX 75001 | Oil & Gas Operator | Apr 2025 |
| 13 | Arrow Exploration Company | Plano, TX 75075 | Oil & Gas Operator | Dec 2004 |
| 14 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | Apr 2025 |