| 1 | W. H. Hunt | | Oil & Gas Operator | Jan 1984 |
| 2 | W. L. Estis | | Oil & Gas Operator | Dec 1999 |
| 3 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 4 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 5 | Walter Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 6 | Wapiti Operating, LLC | Houston, TX 77043 | Oil & Gas Operator | Oct 2025 |
| 7 | Warhorse Oil & Gas, LLC | | Oil & Gas Operator | Dec 2018 |
| 8 | Warwick Oil Corp. | | Oil & Gas Operator | Mar 1990 |
| 9 | Watson Oil Corporation | | Oil & Gas Operator | Jun 1981 |
| 10 | Wayman W. Buchanan | | Oil & Gas Operator | Feb 1986 |
| 11 | Weaver Oil & Gas Corporation | | Oil & Gas Operator | Dec 1984 |
| 12 | Wentworth Production Company | | Oil & Gas Operator | Aug 1985 |
| 13 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 14 | Westport Oil And Gas Company Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2002 |
| 15 | White Deer Production Co. Inc. | | Oil Operator | Jan 1999 |
| 16 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Oct 2025 |
| 17 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 18 | Whittier Operating Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2007 |
| 19 | Will Haristy, Jr. | | Oil & Gas Operator | Nov 2024 |
| 20 | Williams Exploration Company | | Oil & Gas Operator | Dec 1986 |
| 21 | Winchester Production Company | Shreveport, LA 71129 | Oil & Gas Operator | Nov 2008 |
| 22 | Wintershall Corporation | | Oil & Gas Operator | Oct 1989 |
| 23 | Wintershall Oil & Gas Co | | Oil & Gas Operator | Feb 1980 |
| 24 | Wle, Inc. | | Oil & Gas Operator | Feb 2012 |
| 25 | WM. H. Kenny Consultants, LTD. | | Oil & Gas Operator | Nov 1991 |
| 26 | WM. T. Burton Industries, Inc. | | Oil & Gas Operator | Apr 1988 |
| 27 | Woodbine Petroleum, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Aug 2003 |