| 1 | Wacker Oil Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 2 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 3 | Wagner, Duer & Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1999 |
| 4 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 5 | Walker, Tigner | Shreveport, LA 71138 | Oil & Gas Operator | Feb 2005 |
| 6 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | Oct 2025 |
| 7 | Walter Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 8 | Western Energy Group, LLC | Leander, TX 78641 | Oil & Gas Operator | Oct 2025 |
| 9 | Western Gulf Oil & Gas Inc. | Dallas, TX 75360 | Oil & Gas Operator | Jul 2000 |
| 10 | Western Gulf Oil & Gas, LLC | Bishop, TX 78343 | Oil & Gas Operator | Oct 2025 |
| 11 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 12 | WFMMS, Inc. | Batson, TX 77519 | Oil & Gas Operator | Oct 2025 |
| 13 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Oct 2025 |
| 14 | Whitson, James A., Jr. | Houston, TX 77063 | Oil & Gas Operator | Nov 2011 |
| 15 | Wilbanks Energy Corporation | Houston, TX 77036 | Oil & Gas Operator | Dec 2001 |
| 16 | Wild Cat Operating Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 17 | Wood Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Jun 1999 |
| 18 | Woodard Energy Company | Houston, TX 77042 | Oil & Gas Operator | Mar 2010 |
| 19 | Wright Brothers Energy, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Oct 2025 |