| 1 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2025 |
| 2 | T.F. Well Service, L.L.C. | Iowa Park, TX 76367 | Oil Operator | Mar 2025 |
| 3 | Talley, W.T. | Olney, TX 76374 | Oil & Gas Operator | May 2005 |
| 4 | Talon Production, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2025 |
| 5 | Tam2 Squared Operating, LLC | Ranger, TX 76470 | Oil & Gas Operator | Mar 2025 |
| 6 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 7 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 8 | Taubert & Steed | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2001 |
| 9 | Taylor Properties | Wichita Falls, TX 76301 | Gas Operator | Mar 2025 |
| 10 | TB Petroleum, LLC | Petrolia, TX 76377 | Oil & Gas Operator | Mar 2025 |
| 11 | TCT Operating Company, Inc. | Johnson City, TX 78636 | Oil & Gas Operator | Feb 2017 |
| 12 | Teague, J. V. & Robinson, E. W. | Olney, TX 76374 | Oil & Gas Operator | May 1996 |
| 13 | Tega Operating Co. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2012 |
| 14 | Tember Oil Company | Holliday, TX 76366 | Oil & Gas Operator | Mar 2025 |
| 15 | Tempo Resources GP, LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2013 |
| 16 | Terry, Lewis D. | Olney, TX 76374 | Oil & Gas Operator | Sep 1995 |
| 17 | Tex-R Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2021 |
| 18 | Texas Energy Operations, LC | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2025 |
| 19 | Texas Oil Company, The | Houston, TX 77018 | Oil & Gas Operator | Aug 2006 |
| 20 | Texas Shallow Oil & Gas, LLC | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 21 | Texoma Legacy Properties, LLC | Holliday, TX 76366 | Oil Operator | Dec 2023 |
| 22 | Texoma Oil Tools, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 23 | Thompson, Mark P. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 24 | Thor-Max Operating, Inc. | Plano, TX 75025 | Oil & Gas Operator | Mar 2025 |
| 25 | Thornton, Michael D. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 1995 |
| 26 | Three B Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 27 | Three Forks Resources LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Mar 2025 |
| 28 | Three P Operating Co.,GP, L.L.C. | Newcastle, TX 76372 | Oil & Gas Operator | Mar 2025 |
| 29 | Three P Operating Company | Newcastle, TX 76372 | Oil & Gas Operator | Nov 2007 |
| 30 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 31 | Threshold Exploration, Inc. | College Sta, TX 77842 | Oil & Gas Operator | Oct 2015 |
| 32 | Tillman, Jack Equipment Co. | Holliday, TX 76366 | Oil & Gas Operator | Sep 2004 |
| 33 | TPR - Texas Petroleum Res. Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 34 | TR Operating LLC | Graham, TX 76450 | Oil Operator | Jan 2025 |
| 35 | Trans Oil Marketing LLC | Abilene, TX 79608 | Oil Operator | Aug 2023 |
| 36 | Trans-Pecos Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 37 | Tres Piedras, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 1999 |
| 38 | Tri "M" Oil & Gas | Muenster, TX 76252 | Oil & Gas Operator | Mar 2025 |
| 39 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 40 | Triple "S" Gas, Inc. | Dallas, TX 75355 | Oil & Gas Operator | Mar 2025 |
| 41 | True Wolf Operating, LLC | Iowa Park, TX 76367 | Oil Operator | Mar 2025 |
| 42 | Trumter Petroleum Corporation | Fort Worth, TX 76185 | Oil & Gas Operator | Aug 1998 |
| 43 | Truth Resources LP | Houston, TX 77090 | Oil Operator | Sep 2021 |
| 44 | Tucker Resources, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2003 |
| 45 | Turnbow Drilling Co. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2025 |
| 46 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 47 | Twilco Operating LLC | Holliday, TX 76366 | Oil Operator | Mar 2025 |
| 48 | Twin Oaks Construction Company | Irving, TX 75063 | Oil & Gas Operator | Mar 2025 |
| 49 | Txon Partners, LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2017 |
| 50 | Tyco Operating Co. | Archer City, TX 76351 | Oil & Gas Operator | Mar 2025 |