| 1 | T C Operating | Archer City, TX 76351 | Oil & Gas Operator | Sep 2016 |
| 2 | T. R. Production, Inc. | Pilot Point, TX 76258 | Oil & Gas Operator | Jul 2021 |
| 3 | Talus Inc | Graham, TX 76450-1210 | Oil & Gas Operator | Feb 2017 |
| 4 | Tam2 Squared Operating, LLC | Rockwall, TX 75032 | Oil & Gas Operator | Feb 2026 |
| 5 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 6 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 7 | Targo Oil & Gas, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 8 | Tarpon Oil & Gas Co. | Fort Worth, TX 76147 | Oil & Gas Operator | Feb 2026 |
| 9 | Taubert & Steed | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2001 |
| 10 | Taylor, Ben J. Inc. | Fort Worth, TX 76185 | Oil & Gas Operator | Feb 2022 |
| 11 | Taylor, G. E. | Bridgeport, TX 76426 | Oil & Gas Operator | Jan 2001 |
| 12 | Taylor, G. E. Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Jul 2007 |
| 13 | Taylor, J. S. Inc. | Lewisville, TX 75057 | Oil & Gas Operator | Feb 2026 |
| 14 | TC Energy LLC | Covington, OK 73730-2116 | Oil & Gas Operator | Sep 2014 |
| 15 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Feb 2026 |
| 16 | TCT Operating Company, Inc. | Johnson City, TX 78636 | Oil & Gas Operator | Feb 2017 |
| 17 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 18 | Telesis Operating Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2026 |
| 19 | Tempo Resources GP, LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2013 |
| 20 | Tep Barnett USA, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 21 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Feb 2026 |
| 22 | Texas Shallow Oil & Gas, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 23 | Texas Tea Oil Company | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2011 |
| 24 | Texas Utilities Fuel Co. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2018 |
| 25 | Texland-Rector & Schumacher | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2000 |
| 26 | Texoma Oil Tools, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 27 | Textron Southwest Inc. | Henderson, TX 75654 | Oil & Gas Operator | Feb 2026 |
| 28 | Texxol Operating Company, Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Feb 2026 |
| 29 | Three B Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 30 | Three J Operating Company, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2026 |
| 31 | Three P Operating Co.,GP, L.L.C. | Newcastle, TX 76372 | Oil & Gas Operator | Feb 2026 |
| 32 | Three P Operating Company | Newcastle, TX 76372 | Oil & Gas Operator | Nov 2007 |
| 33 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 34 | Titan Energy, Inc. | Austin, TX 78703 | Oil & Gas Operator | Feb 2026 |
| 35 | TLH Production LLC | Abilene, TX 79602 | Oil & Gas Operator | Feb 2026 |
| 36 | TR Operating LLC | Graham, TX 76450 | Oil Operator | Dec 2025 |
| 37 | Trace Energy Management Inc | Weatherford, TX 76086 | Oil & Gas Operator | Feb 2026 |
| 38 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 39 | Tracer Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 40 | Tracker Mineral | Clyde, TX 79510 | Oil & Gas Operator | Feb 2026 |
| 41 | Tree Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 42 | Trek Oil & Gas, Inc | Houston, TX 77002 | Oil Operator | Mar 1998 |
| 43 | Tren Energy LLC | El Paso, TX 79912 | Oil & Gas Operator | Feb 2026 |
| 44 | Tresami, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2026 |
| 45 | Trio Consulting & Management,LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 46 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 47 | Triton Energy LLC | Wortham, TX 76693 | Oil & Gas Operator | Feb 2026 |
| 48 | Txon Partners, LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2017 |
| 49 | Txu Fuel Company | Dallas, TX 75201 | Oil & Gas Operator | May 2004 |