| 1 | Ainsworth, Otis | | Oil & Gas Operator | Jun 1987 |
| 2 | Alamosa Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 3 | Aria Operating LLC | | Oil Operator | Sep 2025 |
| 4 | Bulldog Operating Company LLC | Shreveport, LA 71101-3680 | Oil & Gas Operator | Jun 2015 |
| 5 | Chase Oil & Gas Inc C-O Triad | | Oil & Gas Operator | Mar 1993 |
| 6 | CMW Oil Company | | Oil & Gas Operator | Dec 1976 |
| 7 | Coho Resources Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 2002 |
| 8 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 9 | Formentera Operations LLC | Austin, TX 78701 | Oil & Gas Operator | Dec 2025 |
| 10 | G & S Oil Company | | Oil & Gas Operator | Dec 2024 |
| 11 | Hassie Hunt Expl. Co. | | Oil & Gas Operator | Aug 2008 |
| 12 | Highmark Energy Operating LLC | Dallas, TX 75222 | Oil & Gas Operator | Dec 2025 |
| 13 | Humble Oil & Refining Co. | Houston, TX 77252 | Oil & Gas Operator | Jan 2000 |
| 14 | Industrial Pollution Control | | Oil & Gas Operator | Mar 1985 |
| 15 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | Dec 2025 |
| 16 | Julius Wactor Oil Co | | Oil & Gas Operator | Jan 1986 |
| 17 | Kingwood Energy, LLC | | Oil Operator | Feb 2025 |
| 18 | McGowan Working Partners, Inc. | Jackson, MS 39296 | Oil & Gas Operator | Dec 2025 |
| 19 | Peak Energy Co Inc | | Oil & Gas Operator | Mar 1985 |
| 20 | Pennzoil Expl & Prod Co -TX | | Oil & Gas Operator | May 1993 |
| 21 | Pennzoil Expl & Prod Co. -MS | | Oil Operator | Jan 1988 |
| 22 | Pennzoil Producing Company | | Oil & Gas Operator | Oct 1992 |
| 23 | Reformation Energy Inc | | Oil & Gas Operator | May 1984 |
| 24 | Robinson Resource Dev. Co.Inc. | | Oil & Gas Operator | Oct 1982 |
| 25 | Roundtree & Associates, Inc. | | Oil & Gas Operator | Jun 2024 |
| 26 | Rover Operating, LLC | Chicago, IL 60606 | Oil & Gas Operator | Aug 2025 |
| 27 | Southern Energy Operating, LLC | | Oil & Gas Operator | Sep 2025 |
| 28 | Spooner Petroleum Company | | Oil & Gas Operator | Sep 2025 |
| 29 | Standard Operating Inc | | Oil Operator | Jun 1986 |
| 30 | T. J. Oil And Gas, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2002 |
| 31 | Venture Oil & Gas, Inc. | Laurel, MS 39440 | Oil & Gas Operator | Sep 2025 |