| 1 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2025 |
| 2 | Tahoe Exploration Inc. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2016 |
| 3 | Talon Production, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2025 |
| 4 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 5 | Taubert & Steed | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2001 |
| 6 | Taylor, Ben J. Inc. | Fort Worth, TX 76185 | Oil & Gas Operator | Feb 2022 |
| 7 | Taylor, G. E. | Bridgeport, TX 76426 | Oil & Gas Operator | Jan 2001 |
| 8 | Taylor, G. E. Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Jul 2007 |
| 9 | TB Petroleum, LLC | Petrolia, TX 76377 | Oil & Gas Operator | Mar 2025 |
| 10 | Texakoma E & P, LLC | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 11 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 12 | Texakoma Operating, L.P. | Plano, TX 75024 | Oil & Gas Operator | Jan 2025 |
| 13 | Texas Energy Operations, LC | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2025 |
| 14 | Texoma Oil Tools, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 15 | Texxol Operating Company, Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Mar 2025 |
| 16 | Three-B Oil Company, The | Monahans, TX 79756 | Oil & Gas Operator | Mar 2025 |
| 17 | Tillman, Jack Equipment Co. | Holliday, TX 76366 | Oil & Gas Operator | Sep 2004 |
| 18 | Todd, J R Oil & Investments, Inc | Dallas, TX 75206 | Oil & Gas Operator | Jun 2002 |
| 19 | Trace Energy Management Inc | Weatherford, TX 76086 | Oil & Gas Operator | Mar 2025 |
| 20 | Tracker Mineral | Clyde, TX 79510 | Oil & Gas Operator | Mar 2025 |
| 21 | Trans Oil Marketing LLC | Abilene, TX 79608 | Oil Operator | Aug 2023 |
| 22 | Tree Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 23 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Mar 2025 |
| 24 | Tri "M" Oil & Gas | Muenster, TX 76252 | Oil & Gas Operator | Mar 2025 |
| 25 | Triangle Energy Co. | Pampa, TX 79066 | Oil & Gas Operator | Nov 2000 |
| 26 | Trinity Bay Oil & Gas, Inc. | Lubbock, TX 79416 | Oil & Gas Operator | Mar 2025 |
| 27 | Trio Consulting & Management,LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 28 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 29 | TS & T Drilling, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2016 |
| 30 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 31 | Twilco Operating LLC | Holliday, TX 76366 | Oil Operator | Mar 2025 |
| 32 | Twilight Energy LLC | Fort Worth, TX 76185 | Oil & Gas Operator | Mar 2025 |
| 33 | Twin Oaks Construction Company | Irving, TX 75063 | Oil & Gas Operator | Mar 2025 |
| 34 | Txu Gas Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2004 |
| 35 | Txu Lone Star Pipeline | Dallas, TX 75201 | Oil & Gas Operator | Oct 2003 |