| 1 | Waggoner, John S. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2017 |
| 2 | Waggoner, W. T., Estate | Vernon, TX 76385 | Oil & Gas Operator | Feb 2018 |
| 3 | Waggoner-Baldridge Oper. Co, Inc | Dallas, TX 75206 | Oil & Gas Operator | Jan 1998 |
| 4 | Wagner, Duer & Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1999 |
| 5 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | Sep 2025 |
| 6 | Walsh, F H Jr. Operating Co. Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2019 |
| 7 | Walter Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | May 2009 |
| 8 | Watco Energy | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2025 |
| 9 | Waymar Oil & Gas Company | Texarkana, TX 75503 | Oil & Gas Operator | Jan 2007 |
| 10 | Wells Oilfield Services, Inc. | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 11 | Wellstar Corporation | Northglenn, CO 80233 | Oil & Gas Operator | Jul 2025 |
| 12 | Wes-Mor Drilling, Inc. | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 13 | Westerly Exploration, Inc. | Houston, TX 77256 | Oil & Gas Operator | Sep 2025 |
| 14 | Western Chief Oil & Gas Company | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 15 | Western Chief Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 16 | Western Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2025 |
| 17 | Westridge Oil & Gas Properties | Mineral Wells, TX 76068 | Oil & Gas Operator | Sep 2025 |
| 18 | Westside Energy Op. Co., LP | Oklahoma City, OK 73142 | Oil & Gas Operator | Jun 2008 |
| 19 | WG Operating, Inc. | Tulsa, OK 74153 | Oil & Gas Operator | May 2012 |
| 20 | Whiskey River Oil & Gas LLC | Dallas, TX 75230 | Oil & Gas Operator | Apr 2024 |
| 21 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Sep 2025 |
| 22 | Williams Petroleum Company, Inc. | Burkburnett, TX 76354 | Oil & Gas Operator | Sep 2025 |
| 23 | Williams Prod. Gulf Coast, L.P. | Benbrook, TX 76126 | Oil & Gas Operator | Jan 2012 |
| 24 | Willowbend Investments, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2025 |
| 25 | Wilson, Don H., Inc. | Elkhart, TX 75839 | Oil & Gas Operator | May 2019 |
| 26 | Winchester Energy, LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2025 |
| 27 | Winchester Exploration, Inc. | Arlington, TX 76013 | Oil & Gas Operator | Aug 2003 |
| 28 | Winchester Oil & Gas LLC | Rockdale, TX 76567 | Oil Operator | Sep 2025 |
| 29 | Winchester Production Company | Shreveport, LA 71129 | Oil & Gas Operator | Nov 2008 |
| 30 | Window Operating Co., The | Coleman, TX 76834 | Oil & Gas Operator | Sep 2025 |
| 31 | Winfield Operating Company | Dallas, TX 75214 | Oil & Gas Operator | Sep 2025 |
| 32 | Wise Exploration | Perrin, TX 76486 | Oil & Gas Operator | Sep 2025 |
| 33 | Wise Production Company | Bowie, TX 76230 | Oil & Gas Operator | Sep 2025 |
| 34 | Wise Supply Company | Bowie, TX 76230 | Oil & Gas Operator | Sep 2025 |
| 35 | Wise Well Service | Bowie, TX 76230 | Oil & Gas Operator | Jul 2017 |
| 36 | Wolfson Oil Co. | Dallas, TX 75230 | Oil & Gas Operator | Sep 1999 |
| 37 | Wolsey Oil Inc. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |
| 38 | Wolsey Well Service, Inc. | Windthorst, TX 76389 | Oil & Gas Operator | Jul 2006 |
| 39 | Wolsey Well Service, L.P. | Bowie, TX 76230 | Oil & Gas Operator | Jun 2014 |
| 40 | Woodbine Petroleum, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Aug 2003 |
| 41 | Wooley Petroleum | Alvord, TX 76225 | Oil & Gas Operator | Oct 1994 |
| 42 | WPX Energy Gulf Coast, LP | Benbrook, TX 76126 | Oil & Gas Operator | May 2012 |
| 43 | WT Fitts Operating | Bowie, TX 76230 | Oil & Gas Operator | Sep 2025 |