| 1 | W. B. McCarter, Jr., Inc. | | Oil & Gas Operator | Dec 1995 |
| 2 | W. G. Darsey, III | | Oil & Gas Operator | Nov 1981 |
| 3 | W. M. Morgan | | Oil Operator | Jan 1985 |
| 4 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 5 | Warhorse Oil & Gas, LLC | | Oil & Gas Operator | Dec 2018 |
| 6 | Weeks Exploration Company | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 7 | Wheeler Oil Company | Sperry, OK 74073-9417 | Oil & Gas Operator | Jun 2025 |
| 8 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Oct 2025 |
| 9 | Wilcox Operating Corporation | Shreveport, LA 71115 | Oil & Gas Operator | Oct 2025 |
| 10 | Will-Drill Operating, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | Oct 2025 |
| 11 | Will-Drill Production Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Oct 2025 |
| 12 | William F. Powell | | Oil & Gas Operator | Jun 1979 |
| 13 | Wintershall Oil & Gas Corp | Houston, TX 77027 | Oil & Gas Operator | Jul 1989 |
| 14 | Woolf & Magee, Inc. | | Oil & Gas Operator | Oct 1991 |
| 15 | World Producers, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1994 |
| 16 | Worldwide Energy Corp. | Freer, TX 78357 | Oil & Gas Operator | Jan 1997 |
| 17 | WRT Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | May 1998 |
| 18 | Wynn-Crosby Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 19 | Wynn-Crosby Operating, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |