| 601 | Vortt Exploration Company, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2019 |
| 602 | Voth Operating, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Oct 2005 |
| 603 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 604 | Walter Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | May 2009 |
| 605 | Watusi Energy LLC | Midland, TX 79710 | Oil & Gas Operator | Dec 2024 |
| 606 | WB Mullin Operating LLC | Graham, TX 76450 | Oil & Gas Operator | Dec 2024 |
| 607 | WBR, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 1995 |
| 608 | Wehunt Oil Company, Inc. | Dallas, TX 75376 | Oil & Gas Operator | Nov 2002 |
| 609 | Wells Oilfield Services, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2024 |
| 610 | Wes-Mor Drilling, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2024 |
| 611 | West Inland Energy, Inc. | N Richlnd HLS, TX 76182 | Oil & Gas Operator | Dec 2024 |
| 612 | Western Chief Oil & Gas Company | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 613 | Western Chief Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Dec 2024 |
| 614 | Western Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2024 |
| 615 | Western Reserves Corporation | Abilene, TX 79608 | Oil & Gas Operator | Jan 2008 |
| 616 | Westico Energy Co. | Abilene, TX 79605 | Oil & Gas Operator | Nov 2004 |
| 617 | Westridge Oil & Gas Properties | Mineral Wells, TX 76068 | Oil & Gas Operator | Dec 2024 |
| 618 | Wharton Oil Co. | Vernon, TX 76384 | Oil & Gas Operator | Dec 2000 |
| 619 | Wheat, Buck Resources, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Dec 2009 |
| 620 | White Knight Production LLC | Lafayette, LA 70505 | Oil & Gas Operator | Feb 2024 |
| 621 | Whitehead Prod. Co., Inc. | Humble, TX 77338 | Oil & Gas Operator | Oct 2024 |
| 622 | Wichita Falls Oil Expl. Co. | Holliday, TX 76366 | Oil & Gas Operator | Dec 2024 |
| 623 | Williams Petroleum Company, Inc. | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2024 |
| 624 | Willis Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Dec 2024 |
| 625 | Willowbend Investments, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2024 |
| 626 | Wilson, Olan Max | Cisco, TX 76437 | Oil & Gas Operator | Dec 2024 |
| 627 | Wilson, W.W. Jr. Properties | Abilene, TX 79605 | Oil & Gas Operator | Jul 1995 |
| 628 | Wise Exploration | Perrin, TX 76486 | Oil & Gas Operator | Dec 2024 |
| 629 | Wise Production Company | Bowie, TX 76230 | Oil & Gas Operator | Dec 2024 |
| 630 | Wise Well Service | Bowie, TX 76230 | Oil & Gas Operator | Jul 2017 |
| 631 | World Producers, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1994 |
| 632 | Xplore Operating, LLC | Arlington, TX 76001 | Oil & Gas Operator | Dec 2024 |
| 633 | Xstar Resources LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2024 |
| 634 | Yeates Development Corporation | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2024 |
| 635 | Yellow Rose Oil & Gas Oper. Inc. | Cisco, TX 76437 | Oil & Gas Operator | Dec 2024 |
| 636 | Young, Clint Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2024 |