| 1 | A & B Oil | Monahans, TX 79756 | Oil & Gas Operator | Apr 2024 |
| 2 | Abel, M.D. Co. | Lampasas, TX 76550 | Oil & Gas Operator | Jun 2017 |
| 3 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Apr 2024 |
| 4 | Abraxas Production Corporation | San Antonio, TX 78270 | Oil & Gas Operator | Sep 1999 |
| 5 | Admiral Permian Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 6 | Aegis Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Sep 1998 |
| 7 | Alchemist Energy, LLC | Irving, TX 75062 | Oil & Gas Operator | Apr 2024 |
| 8 | Alcon H2oil LLC | Pecos, TX 79772 | Oil & Gas Operator | Apr 2024 |
| 9 | Allison/Hobbs Inc. | Alba, TX 75410 | Oil & Gas Operator | Apr 2024 |
| 10 | Altura Energy LTD. | Houston, TX 77210 | Oil & Gas Operator | Apr 2000 |
| 11 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 12 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 13 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 14 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 15 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jan 2024 |
| 16 | Anchor B Production, Inc. | Orla, TX 79770 | Oil & Gas Operator | Aug 2003 |
| 17 | Angelo, Ernest, Jr. | Midland, TX 79701 | Oil & Gas Operator | Mar 2008 |
| 18 | Antelope Energy Partners, LLC | Houston, TX 77043 | Oil & Gas Operator | Apr 2024 |
| 19 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 20 | Apr Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 21 | Apv McCamey LLC | MC Camey, TX 79752 | Oil & Gas Operator | Apr 2024 |
| 22 | Arabella Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 23 | Arabella Petroleum Company, LLC | Austin, TX 78701 | Oil & Gas Operator | Apr 2024 |
| 24 | Arch Oil & Gas LLC | Dallas, TX 75248 | Oil & Gas Operator | Apr 2024 |
| 25 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 26 | Arco Permian | Houston, TX 77079 | Oil & Gas Operator | Dec 2001 |
| 27 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 28 | Arris Operating Company LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2016 |
| 29 | Atapco | Houston, TX 77040 | Oil & Gas Operator | Feb 1999 |
| 30 | Atlantic Exploration, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2015 |
| 31 | Atlantic Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 32 | Atlantic Resources Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 33 | Atropos Production Corporation | Dallas, TX 75225 | Oil & Gas Operator | Apr 2024 |
| 34 | Audrey Oil & Gas LLC | Pampa, TX 79066 | Oil & Gas Operator | Apr 2024 |
| 35 | Avad Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 36 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Apr 2024 |