| 1 | T & G Oil, Inc. | White Oak, TX 75693 | Oil & Gas Operator | Dec 2010 |
| 2 | T & J Oil Production, L.L.C. | Lone Grove, OK 73443 | Oil & Gas Operator | Jun 2025 |
| 3 | T. J. Oil And Gas, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2002 |
| 4 | Tab Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 5 | Talbert, Eugene Operating Co,Inc | Tyler, TX 75702 | Oil & Gas Operator | Dec 1997 |
| 6 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 7 | Tanos Exploration II, LLC | Tyler, TX 75701 | Oil & Gas Operator | Sep 2023 |
| 8 | Tanos Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Oct 2018 |
| 9 | Tascosa Petroleum Corporation | Amarillo, TX 79105 | Oil & Gas Operator | Oct 2025 |
| 10 | Tate, Larry V. Operating, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Apr 2002 |
| 11 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Oct 2025 |
| 12 | Tesoro E&P Company, L.P. | San Antonio, TX 78216 | Oil & Gas Operator | Jan 2000 |
| 13 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Oct 2025 |
| 14 | Texas Energy Operations, LC | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 2025 |
| 15 | Texas Independent Explor., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 16 | Texas M.O.R., Inc. | Corsicana, TX 75109 | Oil Operator | Sep 2013 |
| 17 | Texas Utilities Fuel Co. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2018 |
| 18 | Texas Utilities Mining Co. | Dallas, TX 75201 | Oil & Gas Operator | May 1995 |
| 19 | Texlan Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Nov 1994 |
| 20 | Texlan Oil Company, L.C. | Tyler, TX 75711 | Oil & Gas Operator | Aug 2003 |
| 21 | Texstar Petroleum, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 2000 |
| 22 | TGNR East Texas II LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 23 | TGNR East Texas LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 24 | TGNR Gulf Coast LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 25 | Thor Operating Company | Tyler, TX 75710 | Oil & Gas Operator | Dec 1995 |
| 26 | Thrash, Afton | Kilgore, TX 75663 | Oil & Gas Operator | Apr 1996 |
| 27 | Tidemark Exploration Inc | Tulsa, OK 74120 | Oil & Gas Operator | Apr 2019 |
| 28 | Titan Rock E&P, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2024 |
| 29 | Torch Energy Services, Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2011 |
| 30 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 31 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 32 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 33 | Tracy Production | Lindale, TX 75771 | Oil & Gas Operator | Oct 2025 |
| 34 | Trailblazer Energy Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2025 |
| 35 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 36 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Oct 2025 |
| 37 | Tri-Am Operating Company | Frankston, TX 75763 | Oil & Gas Operator | Oct 2025 |
| 38 | Trio Production Company, LLC | Stephens, AR 71764 | Oil Operator | Jan 2025 |
| 39 | Triple J Investments Inc | Longview, TX 75606 | Oil & Gas Operator | Feb 2023 |
| 40 | Triple M Saltwater Disposal, LP | Kilgore, TX 75663 | Oil Operator | Oct 2025 |
| 41 | Triumph Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 1994 |
| 42 | Trivium Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Oct 2025 |
| 43 | Txu Fuel Company | Dallas, TX 75201 | Oil & Gas Operator | May 2004 |
| 44 | Txu Gas Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2004 |
| 45 | TXX Operating LLC | Shreveport, LA 71133 | Oil & Gas Operator | Oct 2025 |
| 46 | Tyler Oil & Gas Inc. | Tyler, TX 75702 | Oil & Gas Operator | Sep 2004 |