| 1 | Warren E & P Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2024 |
| 2 | Washington Energy Exploration | | Oil & Gas Operator | Dec 1997 |
| 3 | Wesco Operating, Inc. | Casper, WY 82602 | Oil & Gas Operator | Mar 2024 |
| 4 | Western American Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2023 |
| 5 | Western Interior Oil & Gas Corp | Casper, WY 82602 | Oil & Gas Operator | May 2015 |
| 6 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 7 | Wexpro Company | Rock Springs, WY 82902-0458 | Oil & Gas Operator | Feb 2024 |
| 8 | Wexpro Development Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Feb 2024 |
| 9 | Wexpro II Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Feb 2024 |
| 10 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 11 | Wilbanks Exploration, Inc. | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 12 | Winter Ridge Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2011 |
| 13 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 14 | WPX Energy Rocky Mountain LLC | Tulsa, OK 74101 | Oil & Gas Operator | Feb 2024 |