| 1 | Wagner, Duer & Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1999 |
| 2 | Ward Trust | Spring, TX 77383 | Oil & Gas Operator | May 2013 |
| 3 | Warren Production Services | Caldwell, TX 77836 | Oil & Gas Operator | Oct 2025 |
| 4 | WCS Oil & Gas Corporation | Dallas, TX 75209 | Oil & Gas Operator | Aug 2021 |
| 5 | Weber Energy Corporation | Dallas, TX 75219 | Oil & Gas Operator | Feb 2017 |
| 6 | Wehunt Oil Company, Inc. | Dallas, TX 75376 | Oil & Gas Operator | Nov 2002 |
| 7 | Westlands Resources Corporation | Monrovia, CA 91016 | Oil & Gas Operator | Oct 2025 |
| 8 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 9 | Wildfire Energy Operating LLC | Houston, TX 77224 | Oil & Gas Operator | Oct 2025 |
| 10 | Wildhorse Resources MNGT Co, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2019 |
| 11 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Oct 2025 |
| 12 | Williams, Clayton Energy, L.L.C | Midland, TX 79705 | Oil & Gas Operator | May 1993 |
| 13 | Williams, Clayton W., Jr., Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 14 | Wilson Hydrocarbon Inc. | Houston, TX 77066 | Oil & Gas Operator | Oct 2025 |
| 15 | Wimco | Dallas, TX 75229 | Oil & Gas Operator | Jul 2008 |