| 901 | Wolsey Oil Inc. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |
| 902 | Wolsey Well Service, Inc. | Windthorst, TX 76389 | Oil & Gas Operator | Jul 2006 |
| 903 | Wolsey Well Service, L.P. | Bowie, TX 76230 | Oil & Gas Operator | Jun 2014 |
| 904 | Woodbine Petroleum, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Aug 2003 |
| 905 | Woods, Herbert S. & Assoc. | El Dorado, AR 71730 | Gas Operator | Feb 2023 |
| 906 | World Hydrocarbon, Inc. | Kaufman, TX 75142 | Gas Operator | Apr 1995 |
| 907 | World Producers, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1994 |
| 908 | Worsham-Steed Gas Storage, L.P. | Houston, TX 77002 | Oil & Gas Operator | Aug 2010 |
| 909 | Worsham-Steed Gas Storage, LLC | Tulsa, OK 74172 | Oil & Gas Operator | Apr 2025 |
| 910 | Wortham, E. H. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |
| 911 | Wright, Robert W. | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 912 | Wright, Robert W. Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2000 |
| 913 | Wy Woodland Operating, LLC | Covington, TX 76636 | Oil & Gas Operator | Apr 2025 |
| 914 | Xplore Operating, LLC | Arlington, TX 76001 | Oil & Gas Operator | Apr 2025 |
| 915 | Xstar Resources LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2025 |
| 916 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2025 |
| 917 | Zivney Energy | White Oak, TX 75693 | Oil & Gas Operator | Apr 2025 |