| 1 | Abel, M.D. Co. | Lampasas, TX 76550 | Oil & Gas Operator | Jun 2017 |
| 2 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Nov 2024 |
| 3 | Abraxas Production Corporation | San Antonio, TX 78270 | Oil & Gas Operator | Sep 1999 |
| 4 | Ace Gathering Inc | Katy, TX 77494 | Oil Operator | Feb 2023 |
| 5 | Acoma Operating, LLC | Lubbock, TX 79424 | Oil & Gas Operator | Nov 2024 |
| 6 | Adventure Exploration PTRS, LLC | Midland, TX 79702 | Oil & Gas Operator | Aug 2012 |
| 7 | Aggietech Oil, LTD. | Midland, TX 79701 | Oil & Gas Operator | Aug 2016 |
| 8 | Alleder Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2024 |
| 9 | Alliance Resources Corporation | Dallas, TX 75367 | Oil & Gas Operator | Nov 2024 |
| 10 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 11 | Altman Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Nov 2024 |
| 12 | Alto Minerals, Inc. | Midland, TX 79708 | Oil & Gas Operator | Apr 2019 |
| 13 | Altura Energy LTD. | Houston, TX 77210 | Oil & Gas Operator | Apr 2000 |
| 14 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 15 | American Exploration | Houston, TX 77010 | Gas Operator | Apr 1994 |
| 16 | Amerind Oil Company, LTD. | Midland, TX 79701 | Oil & Gas Operator | Nov 2004 |
| 17 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 18 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 19 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |
| 20 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Sep 2024 |
| 21 | Angle Oil Company | Hays, KS 67601 | Oil Operator | Sep 2002 |
| 22 | Anthony, Bob G. Inc. | Brookhaven, MS 39601 | Oil & Gas Operator | Nov 2024 |
| 23 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Nov 2024 |
| 24 | Apv McCamey LLC | MC Camey, TX 79752 | Oil & Gas Operator | Nov 2024 |
| 25 | Arch Petroleum Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2008 |
| 26 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 27 | Arco Permian | Houston, TX 77079 | Oil & Gas Operator | Dec 2001 |
| 28 | Arkland Producing Co Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2023 |
| 29 | Arkland, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 1994 |
| 30 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 31 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 32 | Aspen Land & Exploration Co | Tulsa, OK 74159-0335 | Oil & Gas Operator | Jul 2001 |
| 33 | Athlon Energy Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 34 | Athlon Fe Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2015 |
| 35 | Athlon Holdings LP | Denver, CO 80202 | Oil & Gas Operator | Jan 2015 |
| 36 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 37 | Atlantic Exploration, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2015 |
| 38 | Atlantic Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 39 | Atlas Energy Corporation (Del.) | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2024 |
| 40 | Atmos Pipeline - Texas | Dallas, TX 75240 | Oil & Gas Operator | Nov 2024 |
| 41 | Atoka Operating Permian, LLC | Addison, TX 75001 | Oil & Gas Operator | Sep 2023 |
| 42 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |