| 601 | Trans-Pecos Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 602 | Tri-Tex Exploration LTD | Abilene, TX 79608 | Oil Operator | Apr 2019 |
| 603 | Trinity Minerals&Operating Corp. | Abilene, TX 79605 | Oil & Gas Operator | Dec 1995 |
| 604 | Triple "G" Oil Company | Clyde, TX 79510 | Oil & Gas Operator | Apr 1999 |
| 605 | Tristar Exploration, Inc | Pflugerville, TX 78660 | Oil & Gas Operator | Feb 2026 |
| 606 | Tristar Oil & Gas | Freer, TX 78357 | Oil & Gas Operator | Feb 2026 |
| 607 | TSW Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Jan 2016 |
| 608 | Tuckco Petroleum Corporation | Andrews, TX 79714 | Oil & Gas Operator | Feb 2026 |
| 609 | Turner, Greg | Cross Plains, TX 76443 | Oil & Gas Operator | Feb 2026 |
| 610 | Txu Lone Star Pipeline | Dallas, TX 75201 | Oil & Gas Operator | Oct 2003 |
| 611 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 612 | Us. Fuels, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 613 | Van Operating, LTD. | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 614 | Vanco Oil & Gas Corp. | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 615 | Vanguard Production Company | Lubbock, TX 79410 | Oil & Gas Operator | Feb 2026 |
| 616 | Vantage Fort Worth Energy LLC | Pittsburgh, PA 15222 | Oil & Gas Operator | Feb 2026 |
| 617 | Viathon Hydrocarbons, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Oct 2020 |
| 618 | Vin Fisher Operating, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Feb 2026 |
| 619 | Vista Exploration, LLC | Abilene, TX 79601 | Oil & Gas Operator | May 2017 |
| 620 | Vista Resources, Inc. (A) | Midland, TX 79701 | Oil & Gas Operator | Feb 2000 |
| 621 | Vortt Exploration Company, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2019 |
| 622 | Walter Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | May 2009 |
| 623 | Watkins Production Company | Dallas, TX 75229 | Oil & Gas Operator | Feb 2008 |
| 624 | Weaver Global Operating, LLC | Colleyville, TX 76034 | Oil Operator | Feb 2026 |
| 625 | Wells Oilfield Services, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 626 | Wes-Tex Drilling Company | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 627 | West Inland Energy, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Feb 2026 |
| 628 | Westbrook, V. H. | Hobbs, NM 88240 | Oil & Gas Operator | Nov 1993 |
| 629 | Western Energy Group, LLC | Leander, TX 78641 | Oil & Gas Operator | Feb 2026 |
| 630 | Western Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 631 | Western Sky Oil & Gas | Abilene, TX 79604 | Oil & Gas Operator | Aug 2003 |
| 632 | Westico Energy Co. | Abilene, TX 79605 | Oil & Gas Operator | Nov 2004 |
| 633 | Weststar Operating Company | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2015 |
| 634 | Westwood Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | May 2013 |
| 635 | White, Oscar | Tuscola, TX 79562 | Oil & Gas Operator | Feb 2026 |
| 636 | Whitehead Prod. Co., Inc. | Humble, TX 77338 | Oil & Gas Operator | Dec 2025 |
| 637 | Whiteside, H. W. | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 638 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 639 | Whitt Oil & Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 640 | Whitt, W. J. | Albany, TX 76430 | Oil & Gas Operator | Nov 1996 |
| 641 | Wilbanks, Bruce A. | Midland, TX 79701 | Oil & Gas Operator | Aug 1996 |
| 642 | Wilbanks, Bruce A. Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 643 | Wilco Properties, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Jan 2004 |
| 644 | Williams Deville Operating, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2026 |
| 645 | Wilson Well Service Inc. | Cross Plains, TX 76443 | Oil & Gas Operator | Feb 2026 |
| 646 | Wilson, Olan Max | Cisco, TX 76437 | Oil & Gas Operator | Feb 2026 |
| 647 | Winco Oil Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 648 | Windham Resources | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 649 | Windham Resources, Inc. | Tuscola, TX 79562 | Oil & Gas Operator | Feb 2004 |
| 650 | Window Operating Co., The | Coleman, TX 76834 | Oil & Gas Operator | Feb 2026 |
| 651 | Woodygreen Resources, LLC | Plano, TX 75093 | Oil & Gas Operator | Feb 2026 |
| 652 | Wylie Bros. Prod. & DRGL. Co,Inc | Baird, TX 79504 | Oil & Gas Operator | Feb 2026 |
| 653 | Wylie, Fred, Jr. | Moran, TX 76464 | Oil & Gas Operator | Oct 2022 |
| 654 | Xtreme Operating Company LLC | Flower Mound, TX 75022 | Oil Operator | Feb 2026 |
| 655 | Yeates, F. L. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 1997 |
| 656 | Yellow Rose Oil & Gas Oper. Inc. | Cisco, TX 76437 | Oil & Gas Operator | Feb 2026 |
| 657 | Yellow Rose Oil & Gas Operating | Cisco, TX 76437 | Oil & Gas Operator | Jan 1996 |
| 658 | Zachry Oil And Gas Properties | Midland, TX 79708 | Oil & Gas Operator | Feb 2026 |
| 659 | Ziegler-Peru, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 2019 |
| 660 | Zzron Inc. | Midland, TX 79704 | Oil & Gas Operator | Aug 2003 |