| 1 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 2 | American Quasar Petroleum Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2014 |
| 3 | Austin Production Company, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Mar 2015 |
| 4 | Blackburn Operating Co., Inc. | | Oil & Gas Operator | Jun 2008 |
| 5 | Chevron U. S. A., Inc. -TX | | Oil & Gas Operator | Dec 2004 |
| 6 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Dec 2024 |
| 7 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 8 | Denbury Resources Inc. | Plano, TX 75024 | Oil & Gas Operator | Dec 2003 |
| 9 | Eagle Oil & Gas, LLC (Dba Eagle Oil & Gas Co.) | | Oil & Gas Operator | Dec 2021 |
| 10 | Enserch Exploration | | Oil & Gas Operator | Oct 1996 |
| 11 | EP Operating Co. | Dallas, TX 75201 | Oil & Gas Operator | Jan 1993 |
| 12 | First Energy Corporation | | Oil & Gas Operator | Jun 1993 |
| 13 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 14 | Indrex Inc | Tulsa, OK 74133 | Oil & Gas Operator | Dec 2000 |
| 15 | J. R. Pounds, Inc. | Laurel, MS 39441 | Oil & Gas Operator | Sep 2024 |
| 16 | Jack L. Phillips Co. | Gladewater, TX 756471686 | Oil & Gas Operator | Oct 2024 |
| 17 | Knight, Wilbur H. Et Al | | Oil & Gas Operator | Jul 1991 |
| 18 | Miss Basin Oil & Gas Company | | Oil Operator | Jan 1985 |
| 19 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2024 |
| 20 | Phoenix Operating, Inc | | Oil & Gas Operator | Oct 2024 |
| 21 | Pistol Ridge Partners, LLC | | Oil & Gas Operator | Sep 2024 |
| 22 | Pruet Production Co. | Jackson, MS 39201 | Oil & Gas Operator | Sep 2024 |
| 23 | Quarles Drilling Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2008 |
| 24 | RLP Gulf States, L.L.C. | | Oil & Gas Operator | Apr 2012 |
| 25 | Rosson Exploration Company | | Oil & Gas Operator | Apr 2005 |
| 26 | Roundtree & Associates, Inc. | | Oil & Gas Operator | Jun 2024 |
| 27 | Santa Fe Energy Op Partners LP | | Oil & Gas Operator | Oct 1989 |
| 28 | Scorpion Oil & Gas | | Oil & Gas Operator | Sep 2024 |
| 29 | Smith Production Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2024 |
| 30 | T. O. Kimbrell, LLC | | Oil & Gas Operator | Oct 2024 |
| 31 | Tellus Operating Group, LLC | | Oil & Gas Operator | Sep 2024 |
| 32 | Tiger Production Company, LLC | | Oil & Gas Operator | Aug 2021 |