| 1 | Wadi Petroleum Inc | Houston, TX 77014 | Oil & Gas Operator | May 2018 |
| 2 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 3 | Wagner, Duer & Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1999 |
| 4 | Wallis Energy, Inc. | Austin, TX 78746 | Oil & Gas Operator | Apr 2024 |
| 5 | Wandoo Energy, LLC | The Woodlands, TX 77382 | Oil & Gas Operator | Apr 2024 |
| 6 | Waters Eng. & Operating, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Sep 2013 |
| 7 | WCS Oil & Gas Corporation | Dallas, TX 75209 | Oil & Gas Operator | Aug 2021 |
| 8 | Weibye, Carolyn S. | Houston, TX 77098 | Oil & Gas Operator | Apr 2024 |
| 9 | Weiser-Brown Oil Co | Magnolia, AR 71754 | Oil Operator | Feb 2024 |
| 10 | Westhall Associates, Inc. | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Aug 1997 |
| 11 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 12 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Apr 2024 |
| 13 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 14 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Feb 2024 |
| 15 | Whittier Operating Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2007 |
| 16 | Whittington Operating Company | Houston, TX 77069 | Oil & Gas Operator | Apr 2024 |
| 17 | Wilcox Operating Corporation | Shreveport, LA 71115 | Oil & Gas Operator | Apr 2024 |
| 18 | Wild Cat Operating Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 19 | Windrush Operating Co., L.L.C. | Longville, LA 70652 | Oil & Gas Operator | Apr 2024 |
| 20 | Wing Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2000 |
| 21 | Wolf Energy | Midland, TX 79701 | Oil & Gas Operator | Jan 1995 |
| 22 | Wynn-Crosby Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 23 | Wynn-Crosby Operating, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |