| 601 | Wheat, Buck Resources, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Dec 2009 |
| 602 | White Knight Production LLC | Lafayette, LA 70505 | Oil & Gas Operator | Apr 2024 |
| 603 | Whitehead Prod. Co., Inc. | Humble, TX 77338 | Oil & Gas Operator | Jan 2024 |
| 604 | Wichita Falls Oil Expl. Co. | Holliday, TX 76366 | Oil & Gas Operator | Apr 2024 |
| 605 | Williams Petroleum Company, Inc. | Burkburnett, TX 76354 | Oil & Gas Operator | Apr 2024 |
| 606 | Willis Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 607 | Willowbend Investments, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2024 |
| 608 | Wilson, Olan Max | Cisco, TX 76437 | Oil & Gas Operator | Apr 2024 |
| 609 | Wilson, W.W. Jr. Properties | Abilene, TX 79605 | Oil & Gas Operator | Jul 1995 |
| 610 | Wise Exploration | Perrin, TX 76486 | Oil & Gas Operator | Apr 2024 |
| 611 | Wise Production Company | Bowie, TX 76230 | Oil & Gas Operator | Apr 2024 |
| 612 | Wise Well Service | Bowie, TX 76230 | Oil & Gas Operator | Jul 2017 |
| 613 | World Producers, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1994 |
| 614 | Xplore Operating, LLC | Arlington, TX 76001 | Oil & Gas Operator | Apr 2024 |
| 615 | Xstar Resources LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2024 |
| 616 | Yellow Rose Oil & Gas Oper. Inc. | Cisco, TX 76437 | Oil & Gas Operator | Apr 2024 |
| 617 | Young, Clint Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |