| 1 | Wagner & Brown, LTD. | Midland, TX 79702 | Oil & Gas Operator | Aug 2014 |
| 2 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 3 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | Dec 2024 |
| 4 | Walsh, F H Jr. Operating Co. Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2019 |
| 5 | West Bay Exploration Company | Muenster, TX 76252 | Oil & Gas Operator | Sep 2024 |
| 6 | Westbrook Oil & Gas Co. Inc. | Gainesville, TX 76240 | Oil & Gas Operator | Dec 2024 |
| 7 | Western Chief Oil & Gas Company | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 8 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 9 | WFW Production Company, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Dec 2024 |
| 10 | White Marlin Operating Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 11 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jul 2024 |
| 12 | Wilco Properties, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Jan 2004 |
| 13 | Winchester Production Company | Shreveport, LA 71129 | Oil & Gas Operator | Nov 2008 |
| 14 | Withrow Engineering, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Mar 2000 |
| 15 | Wolsey Well Service, Inc. | Windthorst, TX 76389 | Oil & Gas Operator | Jul 2006 |