| 1 | Talbott, Stan C. | Midland, TX 79701 | Oil & Gas Operator | Feb 2005 |
| 2 | Talisman Energy USA Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | May 2016 |
| 3 | Tallgrass Energy, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 4 | Tana Oil And Gas Corporation | Irving, TX 75062 | Oil & Gas Operator | Mar 2000 |
| 5 | Tanos Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Oct 2018 |
| 6 | Tanos Production, Inc. | Houston, TX 77077 | Oil & Gas Operator | Aug 2003 |
| 7 | Tare Resources, LLC | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Dec 2025 |
| 8 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 9 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Dec 2025 |
| 10 | Teal Operating, LLC | Dallas, TX 75225 | Oil & Gas Operator | Oct 2021 |
| 11 | Tejones Operating Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2025 |
| 12 | Terrafina Energy, LLC | San Antonio, TX 78280 | Oil & Gas Operator | Dec 2025 |
| 13 | Tesoro E&P Company, L.P. | San Antonio, TX 78216 | Oil & Gas Operator | Jan 2000 |
| 14 | Teton Petroleum Corporation | Kerrville, TX 78028 | Oil & Gas Operator | Dec 2025 |
| 15 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Dec 2025 |
| 16 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 17 | Texas Fuel Company | Galveston, TX 77550 | Oil & Gas Operator | Dec 2025 |
| 18 | Texas Independent Explor LTD. | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 19 | Texas Independent Explor., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 20 | Texas Land & Petro Co., LLC | Carrollton, TX 75010 | Oil & Gas Operator | Dec 2025 |
| 21 | Texas Secondary Oil Corporation | Devine, TX 78016 | Oil & Gas Operator | Dec 2025 |
| 22 | Texas Southern Petroleum Corp. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Dec 2025 |
| 23 | Texas Western Energy Corporation | Portland, TX 78374 | Oil & Gas Operator | Nov 2002 |
| 24 | Texas, Les & Co. | Brenham, TX 77833 | Oil & Gas Operator | Dec 2025 |
| 25 | Thomas Oil & Gas Company | Luling, TX 78648 | Oil & Gas Operator | Aug 2003 |
| 26 | Three C Exploration, LLC | Hebbronville, TX 78361 | Oil & Gas Operator | Dec 2025 |
| 27 | Thunder Oil & Gas, LLC | Ardmore, OK 73402 | Oil & Gas Operator | Sep 2025 |
| 28 | Tidal Petroleum, Inc. | Schertz, TX 78154 | Oil & Gas Operator | Dec 2025 |
| 29 | Tidewater Minerals Corporation | Orange Grove, TX 78372 | Oil & Gas Operator | Dec 2025 |
| 30 | Torch Energy Services, Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2011 |
| 31 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 32 | Tradition Resources Oper, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2017 |
| 33 | Trailblazer Oil & Gas LLC | Goliad, TX 77963 | Oil & Gas Operator | Dec 2025 |
| 34 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 35 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Dec 2025 |
| 36 | Trident Corporation | Woodsboro, TX 78393 | Oil & Gas Operator | Dec 2025 |
| 37 | Trinity Resources, Inc. | Houston, TX 77277 | Oil & Gas Operator | May 2020 |
| 38 | Triple "S" Resources Inc | Sapulpa, OK 74066 | Oil & Gas Operator | Jun 1995 |
| 39 | Triple L Oil Company | Corpus Chrsti, TX 78469 | Oil & Gas Operator | Jan 1998 |
| 40 | Tschoepe, Arthur J. | Leakey, TX 78873 | Oil & Gas Operator | Jun 2001 |
| 41 | TT Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 42 | Tucker Operating Co., Inc. | Victoria, TX 77903 | Oil & Gas Operator | Dec 2025 |
| 43 | Turner, M. O. | San Antonio, TX 78278 | Oil & Gas Operator | Apr 2003 |
| 44 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 45 | TX Petroleum Company | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Apr 1996 |