| 1 | Tag Operating Company, Inc. | Houston, TX 77092 | Oil & Gas Operator | Oct 2025 |
| 2 | Tal-Con, Inc. | Houston, TX 77279 | Oil & Gas Operator | Oct 2025 |
| 3 | Talon Development Company | Boerne, TX 78006 | Oil & Gas Operator | Sep 2007 |
| 4 | Talos Gulf Coast Onshore LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 5 | TBC Petroleum | Cuero, TX 77954 | Oil & Gas Operator | Sep 2023 |
| 6 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Oct 2025 |
| 7 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 8 | Team Operating, L.L.C. | Pinehurst, TX 77362 | Oil & Gas Operator | Oct 2025 |
| 9 | Tejones Operating Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 10 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | Oct 2025 |
| 11 | Texas American Resources Company | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 12 | Texas Fuel Company | Galveston, TX 77550 | Oil & Gas Operator | Oct 2025 |
| 13 | Texas Independent Explor LTD. | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 14 | Texas Independent Explor., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 15 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 16 | Texinia Corp | Dallas, TX 75201 | Oil & Gas Operator | Jun 2015 |
| 17 | Texokan Energy Corporation | Scroggins, TX 75480 | Oil & Gas Operator | Jul 1996 |
| 18 | Texron Operating, LLC | Bulverde, TX 78163 | Oil & Gas Operator | Oct 2025 |
| 19 | Tidal Petroleum, Inc. | Schertz, TX 78154 | Oil & Gas Operator | Oct 2025 |
| 20 | Tide Energy, Inc. | Dallas, TX 75206 | Gas Operator | Oct 1994 |
| 21 | Tidemark Petroleum, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2002 |
| 22 | Tidewater Minerals Corporation | Orange Grove, TX 78372 | Oil & Gas Operator | Oct 2025 |
| 23 | Titan Resources I, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2000 |
| 24 | Toma Oil & Gas, Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Oct 1997 |
| 25 | Tomlinson, Thomas K. Inc. | Port Lavaca, TX 77979 | Oil & Gas Operator | Jul 2003 |
| 26 | Trans-Pecos Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 27 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 28 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Oct 2025 |
| 29 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 30 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 31 | Triad Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 2011 |
| 32 | Trinidad Resources, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 33 | Trinity Resources, Inc. | Houston, TX 77277 | Oil & Gas Operator | May 2020 |
| 34 | Trump Energy | Austin, TX 78734 | Oil & Gas Operator | Mar 2008 |
| 35 | Tucker Operating Co., Inc. | Victoria, TX 77903 | Oil & Gas Operator | Oct 2025 |
| 36 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |