| 1 | T & G Energy LLC | Dallas, TX 75230 | Oil Operator | Nov 2010 |
| 2 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Oct 2025 |
| 3 | T. W. Drilling Co. | Abilene, TX 79601 | Oil & Gas Operator | Aug 2002 |
| 4 | T.L.S. Oil Co. | Hawley, TX 79525 | Oil & Gas Operator | Oct 2025 |
| 5 | Tabco Exploration Inc. | New Orleans, LA 70131 | Oil & Gas Operator | Dec 1998 |
| 6 | Tahoe Exploration Inc. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2016 |
| 7 | Tankersley, D. C. | Abilene, TX 79601 | Oil & Gas Operator | Sep 2002 |
| 8 | Targo Oil & Gas, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 9 | Taylor, J. S. Inc. | Lewisville, TX 75057 | Oil & Gas Operator | Oct 2025 |
| 10 | TCS Petroleum Co., LLC | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 11 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 12 | Teal Exploration, LLC | Abilene, TX 79602 | Oil Operator | Oct 2025 |
| 13 | Telesis Operating Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Oct 2025 |
| 14 | Tetragon Investments, LLC | Abilene, TX 79604 | Oil Operator | Jul 2014 |
| 15 | Texakoma E & P, LLC | Plano, TX 75024 | Oil & Gas Operator | Oct 2025 |
| 16 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 17 | Texakoma Operating, L.P. | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 18 | Texas Pharchem Inc. | Abilene, TX 79601 | Oil & Gas Operator | Apr 2019 |
| 19 | Texas United Geoproduction, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Oct 2025 |
| 20 | Texxol Operating Company, Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Oct 2025 |
| 21 | Texzona Oil & Gas, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Dec 1997 |
| 22 | Thompson, Richard W. Inc. | Plano, TX 75024 | Oil & Gas Operator | Oct 2025 |
| 23 | Thornton Oil Co. | Abilene, TX 79603 | Oil & Gas Operator | Aug 2003 |
| 24 | Thornton, Michael D. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 1995 |
| 25 | Throckmorton Oil, Inc. | Throckmorton, TX 76483 | Oil & Gas Operator | Mar 2008 |
| 26 | THT Covenant Holdings, LLC | Wichita Falls, TX 76307 | Oil Operator | Oct 2025 |
| 27 | Thunderbolt Oil & Gas, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Feb 2004 |
| 28 | Tiara Resources, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Apr 1998 |
| 29 | Titan Energy, Inc. | Austin, TX 78703 | Oil & Gas Operator | Oct 2025 |
| 30 | TKP Petroleum, Inc. | Lubbock, TX 79464 | Oil & Gas Operator | Oct 2025 |
| 31 | TNT Oil Co. | Hamlin, TX 79520 | Oil & Gas Operator | Oct 2025 |
| 32 | Tollett Oil | Graham, TX 76450 | Oil Operator | Nov 2024 |
| 33 | Townes, Don | Clarksville, TX 75426 | Oil & Gas Operator | Oct 2025 |
| 34 | Townsend Company | Abilene, TX 79608 | Oil & Gas Operator | Dec 2021 |
| 35 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 36 | Tracer Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 37 | Tracker Mineral | Clyde, TX 79510 | Oil & Gas Operator | Oct 2025 |
| 38 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Oct 2025 |
| 39 | Trey Exploration, Inc. | San Angelo, TX 76901 | Oil & Gas Operator | Dec 2020 |
| 40 | Tri-Force Operating, L.L.C. | Royse City, TX 75189 | Oil & Gas Operator | Oct 2025 |
| 41 | Tri-Tex Exploration LTD | Abilene, TX 79608 | Oil Operator | Apr 2019 |
| 42 | Tristar Exploration, Inc | Pflugerville, TX 78660 | Oil & Gas Operator | Oct 2025 |
| 43 | Trust Oil Co. | Pine, CO 80470 | Oil & Gas Operator | Oct 2025 |
| 44 | TSW Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Jan 2016 |
| 45 | Txu Lone Star Pipeline | Dallas, TX 75201 | Oil & Gas Operator | Oct 2003 |