| 601 | Warren, Earl T. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2026 |
| 602 | Watson, B. G. Oil Field Salv Inc | Coleman, TX 76834 | Oil & Gas Operator | Mar 2000 |
| 603 | WCT Leasing Co. | Austin, TX 78734 | Oil & Gas Operator | Apr 2019 |
| 604 | Weldon Corporation | Houston, TX 77056 | Oil Operator | Feb 2020 |
| 605 | Western Reserves Corporation | Abilene, TX 79608 | Oil & Gas Operator | Jan 2008 |
| 606 | Western Sky Oil & Gas | Abilene, TX 79604 | Oil & Gas Operator | Aug 2003 |
| 607 | Weststar Operating Company | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2015 |
| 608 | Westwood Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | May 2013 |
| 609 | White, Oscar | Tuscola, TX 79562 | Oil & Gas Operator | Feb 2026 |
| 610 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 611 | Whitt Oil & Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 612 | Whitt, W. J. | Albany, TX 76430 | Oil & Gas Operator | Nov 1996 |
| 613 | Wilson, Dewey | Coleman, TX 76834 | Oil & Gas Operator | Nov 2007 |
| 614 | Winco Oil Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 615 | Windham Resources | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 616 | Windham Resources, Inc. | Tuscola, TX 79562 | Oil & Gas Operator | Feb 2004 |
| 617 | Window Operating Co., The | Coleman, TX 76834 | Oil & Gas Operator | Feb 2026 |
| 618 | WJH Energy, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 619 | Wolf Production, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 620 | Woodygreen Resources, LLC | Plano, TX 75093 | Oil & Gas Operator | Feb 2026 |
| 621 | Wortham Operating, LLC | Holliday, TX 76366 | Oil & Gas Operator | Apr 2023 |
| 622 | Wortham, E. H. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |
| 623 | Xstar Resources LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2026 |
| 624 | Yellow Rose Oil & Gas Oper. Inc. | Cisco, TX 76437 | Oil & Gas Operator | Feb 2026 |
| 625 | Young, L. M. | Brownwood, TX 76804 | Oil & Gas Operator | Aug 2003 |
| 626 | Ziegler-Peru, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 2019 |
| 627 | ZTH Operating, LLC | Troup, TX 75789 | Oil & Gas Operator | Feb 2026 |
| 628 | Zzron Inc. | Midland, TX 79704 | Oil & Gas Operator | Aug 2003 |