| 1 | Talisman Energy USA Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | May 2016 |
| 2 | Talon Development Company | Boerne, TX 78006 | Oil & Gas Operator | Sep 2007 |
| 3 | TBC Petroleum | Cuero, TX 77954 | Oil & Gas Operator | Sep 2023 |
| 4 | TD Natural Resources LLC | Cuero, TX 77954 | Oil & Gas Operator | Dec 2024 |
| 5 | Teal Operating, LLC | Dallas, TX 75225 | Oil & Gas Operator | Oct 2021 |
| 6 | Tejas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 7 | Tempest Energy Resources, LP | Houston, TX 77251 | Oil & Gas Operator | Jun 2013 |
| 8 | Tenex Corporation | Houston, TX 77227 | Oil & Gas Operator | Dec 2007 |
| 9 | Terrafina Energy, LLC | San Antonio, TX 78280 | Oil & Gas Operator | Dec 2024 |
| 10 | Texas Energy Reserves, Inc | New Braunfels, TX 78130 | Oil & Gas Operator | Jun 1996 |
| 11 | Texas Independent Explor LTD. | Houston, TX 77024 | Oil & Gas Operator | Dec 2024 |
| 12 | Texas Independent Explor., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 13 | Texas Sunset Energy And Ent Inc | Victoria, TX 77904 | Oil Operator | Aug 2003 |
| 14 | Texegy Operating Company LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jun 2024 |
| 15 | Texron Operating, LLC | Bulverde, TX 78163 | Oil & Gas Operator | Dec 2024 |
| 16 | Thomas Oil & Gas Company | Luling, TX 78648 | Oil & Gas Operator | Aug 2003 |
| 17 | Thunderbird Energy, Inc. | Norman, OK 73069 | Oil & Gas Operator | Dec 2024 |
| 18 | Tidal Petroleum, Inc. | Schertz, TX 78154 | Oil & Gas Operator | Dec 2024 |
| 19 | Tidemark Petroleum, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2002 |
| 20 | Tiger Resources, L.L.C. | Houston, TX 77070 | Oil & Gas Operator | Feb 2004 |
| 21 | Tomlinson, Thomas K. Inc. | Port Lavaca, TX 77979 | Oil & Gas Operator | Jul 2003 |
| 22 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 23 | Trailblazer Energy Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2024 |
| 24 | Trans-Pecos Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 25 | Traton Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Mar 2019 |
| 26 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 27 | Triad Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 2011 |
| 28 | Triangle Three Resources L.L.C. | Dallas, TX 75240 | Oil & Gas Operator | Dec 2024 |
| 29 | Trident Corporation | Woodsboro, TX 78393 | Oil & Gas Operator | Dec 2024 |
| 30 | Triple "S" Resources Inc | Sapulpa, OK 74066 | Oil & Gas Operator | Jun 1995 |
| 31 | Tucker Operating Co., Inc. | Victoria, TX 77903 | Oil & Gas Operator | Dec 2024 |