| 201 | U V Industries | | Oil & Gas Operator | Jan 1993 |
| 202 | United Utilities Corporation | Conroe, TX 77301 | Oil & Gas Operator | Oct 1998 |
| 203 | Valkyrie Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2026 |
| 204 | Vaquero Energy Inc | Bakersfield, CA 93309 | Oil & Gas Operator | May 2023 |
| 205 | Vector Minerals Corporation | Aurora, CO 80015 | Oil & Gas Operator | Mar 2026 |
| 206 | Vessels Oil & Gas Company | Denver, CO 80265 | Oil & Gas Operator | Dec 1998 |
| 207 | Vortex Petroleum Inc | Centennial, CO 80111 | Oil Operator | Jan 2026 |
| 208 | Warren E & P Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2026 |
| 209 | Waterford Production Co | | Oil Operator | Oct 1992 |
| 210 | Western Interior Oil & Gas Corp | Casper, WY 82602 | Oil & Gas Operator | May 2015 |
| 211 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 212 | Wexpro Company | Rock Springs, WY 82902-0458 | Oil & Gas Operator | Mar 2026 |
| 213 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 214 | Wilbanks Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 215 | Williams Exploration Company | | Oil & Gas Operator | Dec 1986 |
| 216 | Wold Energy Partners LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2022 |
| 217 | Wold John S | | Gas Operator | Feb 1991 |
| 218 | Wold Oil & Gas | | Oil & Gas Operator | Oct 1996 |
| 219 | Wold Oil Properties Inc | Denver, CO 80203 | Oil & Gas Operator | Feb 2018 |
| 220 | WPX Energy Rocky Mountain LLC | Tulsa, OK 74101 | Oil & Gas Operator | Feb 2026 |
| 221 | Wy Basin Operating LLC | Dallas, TX 75206 | Oil & Gas Operator | Mar 2026 |