| 1 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2024 |
| 2 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 3 | Wallis Energy, Inc. | Austin, TX 78746 | Oil & Gas Operator | Dec 2024 |
| 4 | Walter Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 5 | Warwick Oil & Gas, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 1993 |
| 6 | Western Gulf Oil & Gas, LLC | Bishop, TX 78343 | Oil & Gas Operator | Dec 2024 |
| 7 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Dec 2024 |
| 8 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 9 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jul 2024 |
| 10 | Whittington Operating Company | Houston, TX 77069 | Oil & Gas Operator | Dec 2024 |
| 11 | Wing Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2000 |
| 12 | Winn Exploration Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2024 |
| 13 | WRT Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | May 1998 |