| 1 | T & M Oil Company | Midlothian, TX 76065 | Oil & Gas Operator | Mar 2025 |
| 2 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2025 |
| 3 | Tahoe Exploration Inc. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2016 |
| 4 | Talon Production, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2025 |
| 5 | Tamarron Resources, Inc. | Azle, TX 76020 | Oil & Gas Operator | Mar 2025 |
| 6 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 7 | Tarpon Oil Company | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2017 |
| 8 | Taylor, Dutch | Graham, TX 76450 | Oil & Gas Operator | Jan 2016 |
| 9 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Mar 2025 |
| 10 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 11 | Telesis Operating Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2025 |
| 12 | Tempo Resources GP, LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2013 |
| 13 | Tenison Oil Company | Abilene, TX 79605 | Oil & Gas Operator | Mar 2025 |
| 14 | Terry'S Roustabout Service, Inc. | Throckmorton, TX 76483 | Oil & Gas Operator | Oct 2002 |
| 15 | Tex-Am-Energy Inc. | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 16 | Tex-R Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2021 |
| 17 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 18 | Texxol Operating Company, Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Mar 2025 |
| 19 | Thompson, Richard W. Inc. | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 20 | Thornton, Michael D. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 1995 |
| 21 | Three P Operating Co.,GP, L.L.C. | Newcastle, TX 76372 | Oil & Gas Operator | Mar 2025 |
| 22 | Three P Operating Company | Newcastle, TX 76372 | Oil & Gas Operator | Nov 2007 |
| 23 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 24 | Throckmorton Oil, Inc. | Throckmorton, TX 76483 | Oil & Gas Operator | Mar 2008 |
| 25 | Tiara Resources, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Apr 1998 |
| 26 | Titan Energy, Inc. | Austin, TX 78703 | Oil & Gas Operator | Mar 2025 |
| 27 | Tom-Tom Operating, LLC | Dallas, TX 75209 | Oil Operator | Mar 2025 |
| 28 | Trace Energy Management Inc | Weatherford, TX 76086 | Oil & Gas Operator | Mar 2025 |
| 29 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 30 | Tracer Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 31 | Tracker Resource Dev III, LLC | Englewood, CO 80112 | Oil & Gas Operator | Jul 2021 |
| 32 | Trans Oil Marketing LLC | Abilene, TX 79608 | Oil Operator | Aug 2023 |
| 33 | Treco Oil Company | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 34 | Trio Consulting & Management,LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 35 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 36 | Trust Oil Co. | Pine, CO 80470 | Oil & Gas Operator | Mar 2025 |
| 37 | Truth Resources LP | Houston, TX 77090 | Oil Operator | Sep 2021 |
| 38 | Tucker Resources, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2003 |
| 39 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 40 | Tyco Operating Co. | Archer City, TX 76351 | Oil & Gas Operator | Mar 2025 |