| 1 | W. B. McCarter, Jr., Inc. | | Oil & Gas Operator | Dec 1995 |
| 2 | W. L. Estis | | Oil & Gas Operator | Dec 1999 |
| 3 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2024 |
| 4 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 5 | Walter Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 6 | Watson Energy, L.L.C. | | Oil & Gas Operator | Jun 2005 |
| 7 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 8 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Dec 2024 |
| 9 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jul 2024 |
| 10 | Whitton Company, Inc. | | Oil & Gas Operator | Jul 2020 |
| 11 | Will Haristy, Jr. | | Oil & Gas Operator | May 2024 |
| 12 | William Lagnion | | Oil & Gas Operator | Aug 1998 |
| 13 | Williams Exploration Company | | Oil & Gas Operator | Dec 1986 |
| 14 | Williams-Cody, Inc. | Houston, TX 77060 | Oil & Gas Operator | May 1994 |
| 15 | Windsor Gas Corporation | | Oil & Gas Operator | Aug 1989 |
| 16 | Wle, Inc. | | Oil & Gas Operator | Feb 2012 |
| 17 | WM B Hill Production Co | | Oil Operator | Jun 1991 |
| 18 | WM. H. Kenny Consultants, LTD. | | Oil & Gas Operator | Nov 1991 |
| 19 | WM. T. Burton Industries, Inc. | | Oil & Gas Operator | Apr 1988 |
| 20 | WM. Zuhone, Jr. | | Oil & Gas Operator | Aug 1988 |
| 21 | Woodlawn Energy Dev., L.L.C. | | Oil & Gas Operator | Aug 2006 |
| 22 | Woolf & Magee, Inc. | | Oil & Gas Operator | Oct 1991 |
| 23 | WRT Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | May 1998 |