| 1 | W.O.G., Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 2 | Wagner, Duer & Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1999 |
| 3 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | May 2024 |
| 4 | Walter Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | May 2009 |
| 5 | West Texas Oil And Gas Corp. | Houston, TX 77056 | Oil & Gas Operator | Feb 2014 |
| 6 | West Texas Oil And Gas Oper.,Inc | Houston, TX 77046 | Oil & Gas Operator | May 2024 |
| 7 | West Texas Operating Company,LLC | Victoria, TX 77902 | Oil & Gas Operator | Mar 2023 |
| 8 | Western Reserves Oil Co Inc | Midland, TX 79705 | Oil & Gas Operator | Oct 2020 |
| 9 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 10 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Feb 2024 |
| 11 | Willow Creek Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2009 |
| 12 | Winn Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2024 |
| 13 | WJC, Inc. | Post, TX 79356 | Oil & Gas Operator | May 2024 |
| 14 | WMS Oil Company | Post, TX 79356 | Oil & Gas Operator | May 2019 |
| 15 | Woods Operating Co., Inc. | Shreveport, LA 71136 | Oil & Gas Operator | Dec 2020 |
| 16 | WTP Energy, Inc. | Snyder, TX 79549 | Oil & Gas Operator | May 2024 |