| 201 | Transhorizon Energy Inc | Cheyenne, WY 82003 | Oil & Gas Operator | Jul 2023 |
| 202 | Trigg Drilling Company Inc | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2013 |
| 203 | Trout Kye Jr | | Oil & Gas Operator | Dec 2010 |
| 204 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Jan 2025 |
| 205 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 206 | U V Industries | | Oil & Gas Operator | Jan 1993 |
| 207 | United Utilities Corp | Conroe, TX 77301 | Oil & Gas Operator | Oct 1998 |
| 208 | Valkyrie Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 209 | Vaquero Energy Inc | Bakersfield, CA 93309 | Oil & Gas Operator | May 2023 |
| 210 | Vector Minerals Corporation | Aurora, CO 80015 | Oil & Gas Operator | Dec 2024 |
| 211 | Vessels Oil & Gas Company | Denver, CO 80265 | Oil & Gas Operator | Dec 1998 |
| 212 | Vortex Petroleum Inc | Centennial, CO 80111 | Oil Operator | Dec 2024 |
| 213 | Warren E & P Inc | Dallas, TX 75240 | Oil & Gas Operator | Dec 2024 |
| 214 | Waterford Production Co | | Oil Operator | Oct 1992 |
| 215 | Western Interior Oil & Gas Corp | Casper, WY 82602 | Oil & Gas Operator | May 2015 |
| 216 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 217 | Wexpro Company | Rock Springs, WY 82902-0458 | Oil & Gas Operator | Jan 2025 |
| 218 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 219 | Wilbanks Exploration, Inc. | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 220 | Williams Exploration Company | | Oil & Gas Operator | Dec 1986 |
| 221 | Wold Energy Partners LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2022 |
| 222 | Wold John S | | Gas Operator | Feb 1991 |
| 223 | Wold Oil & Gas | | Oil & Gas Operator | Oct 1996 |
| 224 | Wold Oil Properties Inc | Denver, CO 80203 | Oil & Gas Operator | Feb 2018 |
| 225 | WPX Energy Rocky Mountain LLC | Tulsa, OK 74101 | Oil & Gas Operator | Jan 2025 |