| 1 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2025 |
| 2 | Tactical Oil & Gas, LLC | Odessa, TX 79768 | Oil & Gas Operator | Mar 2025 |
| 3 | Tallgrass Production Company LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2014 |
| 4 | Tam2 Squared Operating, LLC | Ranger, TX 76470 | Oil & Gas Operator | Mar 2025 |
| 5 | Tankersley, D. C. | Abilene, TX 79601 | Oil & Gas Operator | Sep 2002 |
| 6 | Taylor, Frank Well Service | Cross Plains, TX 76443 | Oil & Gas Operator | Aug 2003 |
| 7 | TCS Petroleum Co., LLC | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 8 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 9 | Tech Resources, Inc. | Georgetown, TX 78628 | Oil & Gas Operator | Dec 2001 |
| 10 | Telesis Operating Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2025 |
| 11 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Mar 2025 |
| 12 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 13 | Tenison Oil Company | Abilene, TX 79605 | Oil & Gas Operator | Mar 2025 |
| 14 | Tepco Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Sep 2004 |
| 15 | Tepco, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 1999 |
| 16 | Texas International Resource LLC | Allen, TX 75013 | Oil Operator | Mar 2025 |
| 17 | Texas Operating & Consult., LLC | Abilene, TX 79608 | Oil & Gas Operator | Feb 2018 |
| 18 | Texas United Geoproduction, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Mar 2025 |
| 19 | Texco Operating Co. | San Antonio, TX 78209 | Gas Operator | Aug 2003 |
| 20 | Texical, Inc. | Katy, TX 77491 | Oil & Gas Operator | Mar 2025 |
| 21 | Texlark Exploration Company, Inc | Plano, TX 75074 | Oil & Gas Operator | Sep 2001 |
| 22 | Texxol Operating Company, Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Mar 2025 |
| 23 | Texzona Oil & Gas, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Dec 1997 |
| 24 | Thomas Oil And Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | May 2019 |
| 25 | Thompson, Richard W. Inc. | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 26 | Thornton Oil Co. | Abilene, TX 79603 | Oil & Gas Operator | Aug 2003 |
| 27 | Thunderbolt Oil & Gas, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Feb 2004 |
| 28 | Tidwell Production Company | Sonora, TX 76950 | Oil & Gas Operator | Mar 2025 |
| 29 | TK Operating | Cross Plains, TX 76443 | Oil & Gas Operator | Mar 2025 |
| 30 | TKP Petroleum, Inc. | Lubbock, TX 79464 | Oil & Gas Operator | Mar 2025 |
| 31 | Tor Energy, LLC | Temple, TX 76501 | Oil & Gas Operator | Mar 2025 |
| 32 | Townsend Company | Abilene, TX 79608 | Oil & Gas Operator | Dec 2021 |
| 33 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 34 | Tracer Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 35 | Tracker Mineral | Clyde, TX 79510 | Oil & Gas Operator | Mar 2025 |
| 36 | Trans Oil Marketing LLC | Abilene, TX 79608 | Oil Operator | Aug 2023 |
| 37 | Transcontinental Shale L.L.C. | Austin, TX 78717 | Oil & Gas Operator | Feb 2016 |
| 38 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 39 | Tri-Tex Exploration LTD | Abilene, TX 79608 | Oil Operator | Apr 2019 |
| 40 | Triangle P Development Corp. | Bronte, TX 76933 | Oil & Gas Operator | Mar 2025 |
| 41 | Trinity Minerals&Operating Corp. | Abilene, TX 79605 | Oil & Gas Operator | Dec 1995 |
| 42 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 43 | Trumter Petroleum Corporation | Fort Worth, TX 76185 | Oil & Gas Operator | Aug 1998 |
| 44 | TSW Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Jan 2016 |
| 45 | Tucker Drilling Company, Inc. | San Angelo, TX 76903 | Oil & Gas Operator | Jul 1996 |
| 46 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 47 | Txu Lone Star Pipeline | Dallas, TX 75201 | Oil & Gas Operator | Oct 2003 |