| 1 | Abel, M.D. Co. | Lampasas, TX 76550 | Oil & Gas Operator | Jun 2017 |
| 2 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Apr 2024 |
| 3 | Acock Operating Limited | San Antonio, TX 78270 | Oil & Gas Operator | Apr 2024 |
| 4 | Ageron Energy, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2024 |
| 5 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Apr 2024 |
| 6 | Allegro Investments, Inc. | Victoria, TX 77903 | Oil & Gas Operator | Nov 2020 |
| 7 | Alyana Energy Corporation | Houston, TX 77227 | Oil & Gas Operator | Apr 1995 |
| 8 | American Crude, Inc. | Houston, TX 77002 | Gas Operator | Jan 1987 |
| 9 | American Delta Corporation | Portland, TX 78374 | Oil & Gas Operator | Jun 2013 |
| 10 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 11 | Americo Energy Resources, LLC | Houston, TX 77063 | Oil & Gas Operator | Apr 2024 |
| 12 | Amerril Energy LLC | Houston, TX 77042 | Oil & Gas Operator | Apr 2024 |
| 13 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 14 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | Apr 2024 |
| 15 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 16 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 17 | Anaqua Oil & Gas, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2008 |
| 18 | Anderson Oil LTD. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 19 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 20 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 21 | Antle Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 22 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 23 | Aransas DRLG & Workover Co Inc | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Jul 2019 |
| 24 | Arcadia Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Apr 2024 |
| 25 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 26 | Arete Operating Company, LLC | Austin, TX 78746 | Oil & Gas Operator | Apr 2024 |
| 27 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 28 | Armour Resource Holdings, LTD. | Houston, TX 77046 | Oil & Gas Operator | Nov 1994 |
| 29 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | Apr 2024 |
| 30 | Aurora USA Development, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2014 |
| 31 | Austin Resources Corporation | Houston, TX 77027 | Oil & Gas Operator | Mar 2008 |