| 201 | Tidal Wave Energy, Inc. | New Castle, PA 16105 | Oil & Gas Operator | Jun 2022 |
| 202 | Tigges Oil LLC | | Oil & Gas Operator | Dec 2022 |
| 203 | Timka Resources LTD | | Oil & Gas Operator | Feb 2024 |
| 204 | Tindall Operating Company | Englewood, CO 80112 | Oil & Gas Operator | Feb 2024 |
| 205 | Tom Brown Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 206 | Top Operating Company | | Oil & Gas Operator | Oct 2022 |
| 207 | Trinity Energy Corp | Gibsonia, PA 15044-9106 | Oil & Gas Operator | Dec 2007 |
| 208 | Triple R Oil Co | | Oil & Gas Operator | Jun 2002 |
| 209 | Tudex Petroleum Inc | | Oil & Gas Operator | Sep 2019 |
| 210 | Unioil | Denver, CO 80203 | Oil & Gas Operator | Jun 2012 |
| 211 | United States Exploration, Inc. | Denver, CO 80802 | Oil & Gas Operator | Jun 2009 |
| 212 | Upland Exploration LLC | | Oil & Gas Operator | Jan 2024 |
| 213 | Valley Operating Inc | Denver, CO 80218-3633 | Oil & Gas Operator | Jan 2004 |
| 214 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2021 |
| 215 | Vanguard Permian LLC | Houston, TX 77057 | Oil & Gas Operator | Nov 2018 |
| 216 | Verdad Oil & Gas Corporation | Dallas, TX 75235 | Oil & Gas Operator | Apr 2024 |
| 217 | Verdad Resources LLC | | Oil & Gas Operator | Feb 2024 |
| 218 | Walker Oil & Gas Co LLC* Keith F | | Oil & Gas Operator | Jun 2011 |
| 219 | Walsh Production Inc | | Oil & Gas Operator | Nov 2008 |
| 220 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Dec 2023 |
| 221 | Western Operating Company | Denver, CO 80204 | Oil & Gas Operator | Jan 2024 |
| 222 | Wexpro Company | Rock Springs, WY 82902-0458 | Oil & Gas Operator | Feb 2024 |
| 223 | Whitewing Resources LLC | | Oil & Gas Operator | Jun 2014 |
| 224 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 225 | Wind River Exploration Inc | Sewickley, PA 15143 | Oil & Gas Operator | Dec 2023 |
| 226 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 227 | Wy Woodland Operating, LLC | Covington, TX 76636 | Oil & Gas Operator | Apr 2024 |