| 1 | W.T. Waggoner Estate, Inc. | Vernon, TX 76385 | Oil Operator | Feb 2026 |
| 2 | Waggoner Operating, L.L.C. | Vernon, TX 76385 | Oil Operator | Feb 2026 |
| 3 | Waggoner, Ralph E. | Windthorst, TX 76389 | Oil & Gas Operator | Dec 2010 |
| 4 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | Feb 2026 |
| 5 | Walter Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 6 | Wells Oilfield Services, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 7 | Wes-Mor Drilling, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 8 | Wharton Oil Co. | Vernon, TX 76384 | Oil & Gas Operator | Dec 2000 |
| 9 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 10 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Feb 2026 |
| 11 | Willowbend Investments, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 12 | Wilson Operating Co. | Archer City, TX 76351 | Oil & Gas Operator | Feb 2026 |
| 13 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 14 | Wortham, E. H. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |