| 1 | W&W Oil Co | Denver City, TX 79323 | Oil Operator | Jun 2002 |
| 2 | W.H.D., Inc. | Euless, TX 76039 | Oil & Gas Operator | Aug 1998 |
| 3 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | Apr 2024 |
| 4 | Walter Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | May 2009 |
| 5 | Walter Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 6 | West Inland Energy, Inc. | Aledo, TX 76008 | Oil & Gas Operator | Apr 2024 |
| 7 | West Texas Oil And Gas Oper.,Inc | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 8 | Western Reserves Oil Co Inc | Midland, TX 79705 | Oil & Gas Operator | Oct 2020 |
| 9 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 10 | Wheeler Operating Corporation | Fort Worth, TX 76101 | Oil & Gas Operator | Apr 2024 |
| 11 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 12 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Feb 2024 |
| 13 | Winn Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 14 | WJC, Inc. | Post, TX 79356 | Oil & Gas Operator | Apr 2024 |
| 15 | WMS Oil Company | Post, TX 79356 | Oil & Gas Operator | May 2019 |
| 16 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 17 | WTG Exploration | Midland, TX 79705 | Oil & Gas Operator | Apr 2024 |
| 18 | WTG Exploration Inc | Midland, TX 79705 | Oil & Gas Operator | Dec 2023 |
| 19 | WTP Energy, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Apr 2024 |
| 20 | Wynn-Crosby Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2005 |