| 601 | Twin Oaks Construction Company | Irving, TX 75063 | Oil & Gas Operator | Mar 2025 |
| 602 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2025 |
| 603 | United Energy Partners, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 604 | Upham Oil & Gas Company | Mineral Wells, TX 76068 | Oil & Gas Operator | Mar 2025 |
| 605 | Upham, Chester R., Jr. | Mineral Wells, TX 76067 | Oil & Gas Operator | Aug 2001 |
| 606 | Us. Fuels, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 607 | V-F Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 608 | Van Operating, LTD. | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 609 | Vandermeer Energy Corp. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1998 |
| 610 | Vantage Fort Worth Energy LLC | Pittsburgh, PA 15222 | Oil & Gas Operator | Oct 2017 |
| 611 | Viejo Services, LLC | Boyd, TX 76023 | Oil & Gas Operator | Mar 2025 |
| 612 | Vinson Operating Company | Midland, TX 79706 | Oil & Gas Operator | Dec 1999 |
| 613 | Vista Resources, Inc. (A) | Midland, TX 79701 | Oil & Gas Operator | Feb 2000 |
| 614 | Vortt Exploration Company, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2019 |
| 615 | Wade Operating | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 616 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | Mar 2025 |
| 617 | Walter Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | May 2009 |
| 618 | Walton Producing Company | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2005 |
| 619 | Walton Producing Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 620 | Walton, W. W. | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 1994 |
| 621 | Wapiti Operating, LLC | Houston, TX 77043 | Oil & Gas Operator | Mar 2025 |
| 622 | Wells Oilfield Services, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 623 | Wes-Mor Drilling, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 624 | Wes-Tex Drilling Company | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 625 | West Inland Energy, Inc. | N Richlnd HLS, TX 76182 | Oil & Gas Operator | Mar 2025 |
| 626 | West,Gordon T.Jr. & Rugeley,Stan | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2019 |
| 627 | Western Reserves Corporation | Abilene, TX 79608 | Oil & Gas Operator | Jan 2008 |
| 628 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 629 | Westwood Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | May 2013 |
| 630 | Wheat, Buck Resources, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Dec 2009 |
| 631 | White, Jack Operating | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 632 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 633 | Whitt Oil & Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 634 | Whitt, W. J. | Albany, TX 76430 | Oil & Gas Operator | Nov 1996 |
| 635 | Whittington, James C., Inc. | Dallas, TX 75214 | Oil & Gas Operator | Jan 2017 |
| 636 | Wilbanks, Bruce A. | Midland, TX 79701 | Oil & Gas Operator | Aug 1996 |
| 637 | Wilbrook Exploration, Inc. | Lingleville, TX 76461 | Oil & Gas Operator | Aug 2003 |
| 638 | Wilchar, DR. R. B. | Fort Worth, TX 76185 | Oil & Gas Operator | Jan 2007 |
| 639 | Willis Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 640 | Wilson, Jerry L. | Ranger, TX 76470 | Oil & Gas Operator | Mar 2025 |
| 641 | Wimberley Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2013 |
| 642 | Winchester Exploration, Inc. | Arlington, TX 76013 | Oil & Gas Operator | Aug 2003 |
| 643 | Winn Exploration Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2025 |
| 644 | Winn Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 645 | Wylie, Fred, Jr. | Moran, TX 76464 | Oil & Gas Operator | Oct 2022 |
| 646 | Yeates Development Corporation | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 647 | Yeates, F. L. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 1997 |
| 648 | Yellow Rose Oil & Gas Oper. Inc. | Cisco, TX 76437 | Oil & Gas Operator | Mar 2025 |
| 649 | Yellow Rose Oil & Gas Operating | Cisco, TX 76437 | Oil & Gas Operator | Jan 1996 |
| 650 | Young, L. M. | Brownwood, TX 76804 | Oil & Gas Operator | Aug 2003 |
| 651 | Zagava, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 652 | Zinke & Trumbo, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2007 |