| 301 | Westbrook Oil & Gas Co. Inc. | Gainesville, TX 76240 | Oil & Gas Operator | Sep 2026 |
| 302 | Western Chief Oil & Gas Company | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 303 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 304 | WFW Production Company, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Sep 2026 |
| 305 | White Marlin Operating Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 306 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 307 | Wilco Properties, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Jan 2004 |
| 308 | Winchester Production Company | Shreveport, LA 71129 | Oil & Gas Operator | Nov 2008 |
| 309 | Withrow Engineering, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Mar 2000 |
| 310 | WLH Production LLC | Gainesville, TX 76240 | Oil Operator | Sep 2026 |
| 311 | Wolsey Well Service, Inc. | Windthorst, TX 76389 | Oil & Gas Operator | Jul 2006 |
| 312 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Sep 2026 |
| 313 | Younger Energy Company | Wichita, KS 67206 | Oil & Gas Operator | Sep 2026 |