| 1 | T. R. Production, Inc. | Pilot Point, TX 76258 | Oil & Gas Operator | Jul 2021 |
| 2 | Tanglewood Oil & Gas Co. | Gouldbusk, TX 76845 | Oil & Gas Operator | Oct 2025 |
| 3 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 4 | Targo Oil & Gas, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 5 | Taubert & Steed | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2001 |
| 6 | Taylor, G. E. | Bridgeport, TX 76426 | Oil & Gas Operator | Jan 2001 |
| 7 | Taylor, G. E. Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Jul 2007 |
| 8 | Tega Operating Co. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2012 |
| 9 | Tejas Western Corp. | Granbury, TX 76048 | Oil & Gas Operator | Jul 2018 |
| 10 | Teleo Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Apr 2009 |
| 11 | Tep Barnett USA, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 12 | Tettleton, Jon Otis | Nocona, TX 76255 | Oil & Gas Operator | Aug 2003 |
| 13 | Tettleton, Steven B. | Nocona, TX 76255 | Oil Operator | Oct 2025 |
| 14 | Texcrude Services LLC | Iowa Park, TX 76367 | Oil Operator | Oct 2025 |
| 15 | Texu Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Jan 2007 |
| 16 | Thomas, M.A. Oil Associates | Nocona, TX 76255 | Oil & Gas Operator | Oct 2025 |
| 17 | Three P Operating Company | Newcastle, TX 76372 | Oil & Gas Operator | Nov 2007 |
| 18 | Tomar Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Mar 2001 |
| 19 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Oct 2025 |
| 20 | Trey Exploration, Inc. | San Angelo, TX 76901 | Oil & Gas Operator | Dec 2020 |
| 21 | Triangle Three Resources L.L.C. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2024 |
| 22 | Trio Consulting & Management,LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 23 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 24 | Trio Production Company, LLC | Stephens, AR 71764 | Oil Operator | Jan 2025 |
| 25 | Triple G Well Service, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Oct 2025 |
| 26 | TS Oil, LLC | Fort Worth, TX 76114 | Oil & Gas Operator | Oct 2025 |
| 27 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 28 | Txon Partners, LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2017 |