| 201 | Wes-Tex Drilling Company | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 202 | West Texas Assets, LLC | Fort Worth, TX 76108 | Gas Operator | May 2018 |
| 203 | Western Chief Oil & Gas Company | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 204 | Western Chief Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 205 | Western Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 206 | Williams Prod. Gulf Coast, L.P. | Benbrook, TX 76126 | Oil & Gas Operator | Jan 2012 |
| 207 | Willowbend Investments, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 208 | Winchester Production Company | Shreveport, LA 71129 | Oil & Gas Operator | Nov 2008 |
| 209 | Wolsey Well Service, L.P. | Bowie, TX 76230 | Oil & Gas Operator | Jun 2014 |
| 210 | WPX Energy Gulf Coast, LP | Benbrook, TX 76126 | Oil & Gas Operator | May 2012 |
| 211 | Xophi Energy, LLC | Arlington, TX 76006 | Oil & Gas Operator | Mar 2025 |
| 212 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 213 | Young Oil Corporation | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2013 |
| 214 | Young, Marshall R., Oil Co. | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2011 |