| 101 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Dec 2025 |
| 102 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 103 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 104 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2025 |
| 105 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | Jun 2025 |
| 106 | Cobalt Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Feb 2025 |
| 107 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 108 | Cockrell Production Co., Inc. | Irving, TX 75014 | Oil & Gas Operator | Dec 2025 |
| 109 | Coert Holdings 1 LLC | Greenwich, CT 06830 | Oil & Gas Operator | Dec 2021 |
| 110 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 111 | Collins & Ware, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 112 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 113 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 114 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 115 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 116 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 117 | Cordero Energy Operating LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2020 |
| 118 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Dec 2025 |
| 119 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 120 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 121 | Cox Exploration, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1999 |
| 122 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 123 | Crockett Operating, LLC | Arlington, TX 76017 | Oil & Gas Operator | Dec 2025 |
| 124 | Crockett Operting, LLC | Arlington, TX 76013 | Oil & Gas Operator | Oct 2020 |
| 125 | Cross Cut Petroleum, LLC | Abilene, TX 79602 | Oil Operator | Dec 2025 |
| 126 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 127 | Crossland Oil & Gas | Dallas, TX 75205 | Oil & Gas Operator | Aug 1994 |
| 128 | Crossroads Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 129 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 130 | Custer & Wright Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 131 | D & D Enterprises | Post, TX 79356 | Oil & Gas Operator | Dec 2025 |
| 132 | D90 Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 133 | Dakota Resources, Inc. (I) | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 134 | Davis & Carr Energy Co. | Midland, TX 79702 | Oil & Gas Operator | Jun 1994 |
| 135 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 136 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 137 | Diamond M Oil Co., Inc. | Monahans, TX 79756 | Oil & Gas Operator | Dec 2025 |
| 138 | Diamondback E&P LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 139 | Diamondback Resources LLC | Midland, TX 79705 | Oil & Gas Operator | May 2018 |
| 140 | Diler Development Inc. | Garland, TX 75043 | Oil & Gas Operator | Dec 2025 |
| 141 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 142 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Dec 2025 |
| 143 | Down-Hole Pump Service Co., Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Dec 2025 |
| 144 | Dreher, George R. | Midland, TX 79702 | Oil & Gas Operator | Jan 2018 |
| 145 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 146 | Drum, Delton | Liberty, TX 77575 | Oil & Gas Operator | Jul 2005 |
| 147 | Duke, M. L. | Snyder, TX 79549 | Oil & Gas Operator | Mar 2008 |
| 148 | Dune Oil And Gas, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Aug 2006 |
| 149 | Dunigan Operating Company, Inc. | Austin, TX 78755 | Oil & Gas Operator | Dec 2025 |
| 150 | Dunigan Petroleum, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 151 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 152 | Dym Energy, Inc. | Celina, TX 75009 | Oil & Gas Operator | Apr 2018 |
| 153 | E.G.L. Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 154 | Earnest Producing Corporation | Midland, TX 79704 | Oil & Gas Operator | Dec 2025 |
| 155 | Eastland Exploration, Inc. | Austin, TX 78763 | Oil & Gas Operator | Apr 1997 |
| 156 | Eastland Oil Company, The | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 157 | Eclipse Oil & Gas, Inc. | Midland, TX 79703 | Oil & Gas Operator | Dec 2025 |
| 158 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 159 | Elam, Jack G. | Midland, TX 79702 | Oil & Gas Operator | Dec 2002 |
| 160 | Element Petro Operating II, LLC | Midland, TX 79701 | Oil & Gas Operator | Sep 2016 |
| 161 | Element Petroleum Operating IV, LLC | Midland, TX 79710 | Oil Operator | Dec 2025 |
| 162 | Elk Energy Corporation | Denver, CO 80218 | Oil & Gas Operator | Mar 2008 |
| 163 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 164 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 165 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 166 | Energy Resources Oil & Gas Corp. | Amarillo, TX 79102 | Oil & Gas Operator | Jun 1994 |
| 167 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Sep 2025 |
| 168 | Enerquest Resources, LLC | Midland, TX 79702 | Oil & Gas Operator | Nov 2005 |
| 169 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 170 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 171 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 172 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 173 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 174 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 175 | Estancia Oil & Gas, LLC | Austin, TX 78716 | Oil & Gas Operator | Dec 2025 |
| 176 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 177 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 178 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 179 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 180 | Fagadau Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2006 |
| 181 | Fasken Oil And Ranch, LTD. | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 182 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 183 | Finaly Resources LLC | Sunset Beach, CA 90742 | Oil & Gas Operator | Dec 2025 |
| 184 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Dec 2025 |
| 185 | Firebird Energy II LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2025 |
| 186 | Flat Top Operating, LLC | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 187 | Flying W Resources, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 188 | Forcenergy Onshore Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 189 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 190 | Forest Oil Permian Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 191 | Forte Energy Corporation | Dallas, TX 75205 | Oil & Gas Operator | Dec 2010 |
| 192 | Fueled Resources Inc | Boyd, TX 76023 | Oil & Gas Operator | Dec 2025 |
| 193 | G P II Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2020 |
| 194 | Gaea Services, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2021 |
| 195 | Gecko | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 196 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 197 | Geotech Production Inc | Centennial, CO 80016 | Oil Operator | Apr 2011 |
| 198 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Sep 2025 |
| 199 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 200 | Grace Petroleum Operating, LLC | Llano, TX 78643 | Oil & Gas Operator | Dec 2025 |