| 1 | Alabama Energy Group, Inc. | | Oil & Gas Operator | Aug 1986 |
| 2 | American Quasar Petroleum Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2014 |
| 3 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 4 | Arp Production Company, LLC | Fort Worth, TX 76102 | Gas Operator | Dec 2025 |
| 5 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | Feb 2026 |
| 6 | Black Warrior Methane Corp. | | Gas Operator | Dec 2025 |
| 7 | Carless Resources Inc | Cambridge, OH 43725 | Oil & Gas Operator | Dec 1997 |
| 8 | Cci Robinson'S Bend LLC | | Gas Operator | Dec 2025 |
| 9 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 10 | Coaltech, Inc. | | Gas Operator | Jun 1993 |
| 11 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 12 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 13 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 14 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 15 | Jabsco Oil Operating, LLC | Tuscaloosa, AL 35401 | Oil & Gas Operator | Dec 2025 |
| 16 | Kavanaugh Energy Services, Inc. | | Gas Operator | Nov 2025 |
| 17 | Kukui Operating Company | Ignacio, CO 81137 | Oil & Gas Operator | May 2013 |
| 18 | Land And Natural Resource Development, Inc. | Northport, AL 35473 | Oil & Gas Operator | Dec 2025 |
| 19 | Lasseter Operating Co., Inc. | | Gas Operator | Aug 1993 |
| 20 | McCauley Operating Co., Inc. | | Gas Operator | Mar 1999 |
| 21 | Miller, W.C. | | Oil & Gas Operator | Jan 1992 |
| 22 | Morrow Oil & Gas Co. | Terry, MS 39170 | Oil & Gas Operator | Dec 2025 |
| 23 | O.G.P. Operating, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Feb 2026 |
| 24 | Pete'S Pumping & Well Services, LLC | Butler, AL 36904 | Oil & Gas Operator | Dec 2025 |
| 25 | PGP Operating, LLC | Vance, AL 35490 | Gas Operator | Dec 2025 |
| 26 | River Gas Corporation | Tuscaloosa, AL 35406-2233 | Gas Operator | Dec 2000 |
| 27 | S. Lavon Evans Jr., Operating Co., Inc. | | Oil & Gas Operator | Aug 2014 |
| 28 | Saga Resource Management LLC | | Gas Operator | Dec 2025 |
| 29 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 30 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 31 | Taurus Exploration, Inc. | | Oil & Gas Operator | Dec 2025 |
| 32 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 33 | Walter Black Warrior Basin LLC | | Gas Operator | Dec 2014 |
| 34 | Warrior Met Coal Gas, LLC | Brookwood, AL 35444 | Gas Operator | Dec 2025 |