| 1 | Wadi Petroleum Inc | Houston, TX 77014 | Oil & Gas Operator | May 2018 |
| 2 | Wagner & Brown, LTD. | Midland, TX 79702 | Oil & Gas Operator | Aug 2014 |
| 3 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 4 | Wagner, Duer & Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1999 |
| 5 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 6 | Wallis Energy, Inc. | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 7 | Ward, E. B. | Alice, TX 78333 | Oil & Gas Operator | Jun 2001 |
| 8 | Warner-Pawel | Alice, TX 78333 | Oil & Gas Operator | Oct 2025 |
| 9 | Waters Eng. & Operating, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Sep 2013 |
| 10 | Welder Exploration & Prod., Inc. | San Antonio, TX 78212 | Oil & Gas Operator | Dec 2022 |
| 11 | Welderxp LTD. | San Antonio, TX 78212 | Oil & Gas Operator | Oct 2025 |
| 12 | Western Energy Group, LLC | Leander, TX 78641 | Oil & Gas Operator | Oct 2025 |
| 13 | Western Pride Resources, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Jan 2011 |
| 14 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Oct 2025 |
| 15 | Whitesands Operating, L.L.C. | Corpus Chrsti, TX 78466 | Oil & Gas Operator | Mar 2025 |
| 16 | Whitesands Resources, L.L.C. | Corpus Chrsti, TX 78466 | Oil Operator | Jun 2019 |
| 17 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 18 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 19 | Whittington Operating Company | Houston, TX 77069 | Oil & Gas Operator | Oct 2025 |
| 20 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Oct 2025 |
| 21 | Wilson Hydrocarbon Inc. | Houston, TX 77066 | Oil & Gas Operator | Oct 2025 |
| 22 | Winn Exploration Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 23 | Winslow, Harry C. | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 24 | Wofford, C. J. | El Campo, TX 77437 | Oil & Gas Operator | Oct 2025 |
| 25 | Wolverine Exploration Company | Houston, TX 77002 | Oil & Gas Operator | May 2019 |