| 1 | T & G Oil, Inc. | White Oak, TX 75693 | Oil & Gas Operator | Dec 2010 |
| 2 | T M Hopkins Operating Co | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2002 |
| 3 | Tanos Exploration II, LLC | Tyler, TX 75701 | Oil & Gas Operator | Sep 2023 |
| 4 | Tanos Exploration IV, LLC | Tyler, TX 75703 | Oil & Gas Operator | Oct 2025 |
| 5 | Tanos Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Oct 2018 |
| 6 | Tate, Larry V. Operating, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Apr 2002 |
| 7 | TDX Energy, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 8 | Teco Operating Company | Athens, TX 75751 | Oil & Gas Operator | Jun 2001 |
| 9 | Tex-Ok Energy, LTD Partnership | Cody, WY 82414 | Oil & Gas Operator | Oct 2025 |
| 10 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Oct 2025 |
| 11 | Texas Energy Operations, LC | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 2025 |
| 12 | Texlan Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Nov 1994 |
| 13 | TGNR East Texas LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 14 | TGNR Gulf Coast LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 15 | Thomas, B. K. | Plano, TX 75093 | Oil & Gas Operator | Jan 2008 |
| 16 | Total E&P USA, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 2025 |
| 17 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 18 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 19 | Trivium Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Oct 2025 |
| 20 | TTK Energy LLC | Kilgore, TX 75663 | Oil Operator | Oct 2025 |
| 21 | Txok Texas Energy Resources,L.P. | Dallas, TX 75251 | Oil & Gas Operator | Apr 2008 |
| 22 | Tyler Oil & Gas Inc. | Tyler, TX 75702 | Oil & Gas Operator | Sep 2004 |