| 101 | Desert Eagle Operating LLC | | Gas Operator | Oct 2025 |
| 102 | Developing Equities Group LLC | | Oil & Gas Operator | Feb 2008 |
| 103 | Diamond Oil And Gas, Inc. | Kalamazoo, MI 49001 | Oil & Gas Operator | Dec 2025 |
| 104 | Diamond Operating Inc | | Oil & Gas Operator | Aug 2021 |
| 105 | Diamondback Oil Partners LLP | Arvada, CO 80004 | Oil & Gas Operator | Sep 2016 |
| 106 | Diversified Energy LLC | Parker, CO 80138 | Oil & Gas Operator | Aug 2025 |
| 107 | Diversified Operating Corp. | Golden, CO 80401 | Oil & Gas Operator | Oct 2012 |
| 108 | Donnelly Casing Pulling Co | | Oil Operator | Aug 2020 |
| 109 | Dover Atwood Corp. | Massillon, OH 44646 | Oil & Gas Operator | Dec 2024 |
| 110 | Dugan Production Corp | Farmington, NM 87499 | Oil & Gas Operator | Sep 2025 |
| 111 | Duke Gas Company LLC | | Oil & Gas Operator | Sep 2025 |
| 112 | Dunamis Energy Operating LLC | | Oil & Gas Operator | Sep 2025 |
| 113 | Dunne Equities Operating, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2022 |
| 114 | Eagle Operating, Inc. | Minot, ND 58701 | Oil & Gas Operator | Oct 2025 |
| 115 | East Cheyenne Gas Storage LLC | | Oil & Gas Operator | Sep 2025 |
| 116 | Edge Energy II LLC | Golden, CO 80401 | Oil & Gas Operator | Nov 2025 |
| 117 | Edge Energy LLC | | Oil & Gas Operator | Sep 2025 |
| 118 | Edwards Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 119 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 120 | Ellora LLC | Boulder, CO 80308 | Oil & Gas Operator | Feb 2009 |
| 121 | Elm Ridge Exploration Company LLC | Bloomfield, NM 87413 | Oil & Gas Operator | Nov 2017 |
| 122 | Encana Energy Resources Inc | Denver, CO 80202-2828 | Oil & Gas Operator | Feb 2024 |
| 123 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 124 | Enduring Resources, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Sep 2025 |
| 125 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 126 | Energy Alliance Company Inc | | Oil & Gas Operator | Jan 2018 |
| 127 | Energy Investments Inc. | | Oil & Gas Operator | Sep 2025 |
| 128 | Energy Search Company Inc | Aurora, CO 80011 | Oil & Gas Operator | Jun 2021 |
| 129 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Aug 2025 |
| 130 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 131 | Enprop Inc | | Oil & Gas Operator | Feb 2013 |
| 132 | Entek GRB LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 133 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 134 | Epic Energy, L.L.C. | Aztec, NM 87410 | Oil & Gas Operator | Sep 2025 |
| 135 | Evergreen Natural Resources LLC | | Gas Operator | Oct 2025 |
| 136 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Aug 2025 |
| 137 | Extraction Oil & Gas LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 138 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 139 | Fahey Oil & Gas | | Oil & Gas Operator | Jul 2021 |
| 140 | Faulconer Inc* Vernon E | | Gas Operator | Oct 2018 |
| 141 | Fees Jr And Son Oil & Gas* Walter S | | Oil & Gas Operator | Sep 2025 |
| 142 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Nov 2025 |
| 143 | Forestar Group Inc | | Oil Operator | Sep 2015 |
| 144 | Fortitude Exploration Co | | Oil & Gas Operator | Aug 2025 |
| 145 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Dec 2025 |
| 146 | Fountainhead Resources LTD | | Oil & Gas Operator | Apr 2016 |
| 147 | Four Corners Energy, LLC | Gulf Breeze, FL 32563 | Oil & Gas Operator | Dec 2025 |
| 148 | Four Star Oil & Gas Company | Houston, TX 77252 | Oil & Gas Operator | Sep 2025 |
| 149 | Fram Operating LLC | | Oil & Gas Operator | Dec 2018 |
| 150 | Fritz & Digman Inc | | Oil Operator | Sep 2025 |
| 151 | Fritzler Resources Inc | Fort Morgan, CO 80701 | Oil & Gas Operator | Jun 2025 |
| 152 | Fulcrum Energy Operating, LLC | Denver, CO 80206 | Oil & Gas Operator | Dec 2025 |
| 153 | Fundare Resources Operating Company LLC | | Oil & Gas Operator | Sep 2025 |
| 154 | Gadeco, LLC | | Oil & Gas Operator | Oct 2025 |
| 155 | Genesis Gas & Oil Colorado LLC | | Oil & Gas Operator | Dec 2023 |
| 156 | Geomet Operating Co., Inc. | | Gas Operator | Dec 2013 |
| 157 | Geotech Production Inc | Centennial, CO 80016 | Oil Operator | Apr 2011 |
| 158 | Gibson J W | | Oil & Gas Operator | Sep 1999 |
| 159 | Gilbert-Stewart Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 160 | Gils Hot Oil Service | | Oil Operator | Jun 2022 |
| 161 | GMT Exploration Company LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 162 | Goodwin Energy Management LLC | | Oil & Gas Operator | Dec 2022 |
| 163 | Gordon Engineering Inc | | Gas Operator | Sep 2025 |
| 164 | Grand Mesa Operating Company | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 165 | Great Northern Gas Company | Denver, CO 80293-0602 | Oil & Gas Operator | Jun 2016 |
| 166 | Great Western Operating Company LLC | | Oil & Gas Operator | Aug 2020 |
| 167 | Griffin Management LLC | | Oil & Gas Operator | Feb 2010 |
| 168 | Grizzly Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Aug 2025 |
| 169 | GRMR Oil And Gas LLC | Broomfield, CO 80021 | Oil & Gas Operator | Sep 2025 |
| 170 | Grynberg* Jack Dba Grynberg Petroleum Co | | Oil Operator | Jan 2023 |
| 171 | Gulfport Energy Corporation | Oklahoma City, OK 73114-5003 | Oil & Gas Operator | Aug 2025 |
| 172 | Gunnison Energy LLC | | Oil & Gas Operator | Sep 2025 |
| 173 | H & M Petroleum Corporation | Lincoln, NE 68516 | Oil & Gas Operator | Jun 2025 |
| 174 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Apr 2015 |
| 175 | Halde Oil Inc | | Oil & Gas Operator | Sep 2025 |
| 176 | Harburg* Rudolph W | | Oil & Gas Operator | Nov 2022 |
| 177 | Harsh International Inc | | Oil & Gas Operator | Dec 2013 |
| 178 | Hayes Oil & Gas Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2003 |
| 179 | Helena Resources Inc | Lakewood, CO 80215 | Oil & Gas Operator | Oct 2025 |
| 180 | High Plains Energy LLC | | Oil & Gas Operator | May 2017 |
| 181 | High River Resources Operating, LLC | Farmington, NM 87401 | Oil & Gas Operator | Sep 2025 |
| 182 | Highpoint Energy LLC | | Oil & Gas Operator | Nov 2022 |
| 183 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Dec 2025 |
| 184 | Holcomb Oil & Gas Inc | Farmington, NM 87401 | Oil & Gas Operator | Sep 2025 |
| 185 | Homestead Oil Inc | | Oil & Gas Operator | Jun 2014 |
| 186 | Horseshoe Operating Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2023 |
| 187 | HRC Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2017 |
| 188 | HRM Resources III LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2022 |
| 189 | HRM Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2015 |
| 190 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Sep 2002 |
| 191 | Hubbard Creek Coal Gas LLC | | Gas Operator | Oct 2025 |
| 192 | Hubbs III, LLC | | Oil & Gas Operator | Mar 2024 |
| 193 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Dec 2025 |
| 194 | Hyndrex Resources | | Oil & Gas Operator | Feb 2016 |
| 195 | Impetro Resources LLC | | Oil & Gas Operator | Sep 2025 |
| 196 | Incline Operating LLC | | Oil & Gas Operator | Sep 2025 |
| 197 | Incremental Oil & Gas (Florence) LLC | | Oil & Gas Operator | Oct 2025 |
| 198 | Industrial Gas Services Inc | Wheat Ridge, CO 80033 | Oil & Gas Operator | Feb 2023 |
| 199 | Investment Equipment LLC | FT Morgan, CO 80701 | Oil & Gas Operator | Sep 2025 |
| 200 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Dec 2025 |