| 101 | Byrd Operating Company | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 102 | C & S Oil Company | Odessa, TX 79763 | Oil & Gas Operator | Nov 2019 |
| 103 | C Rose Oil Co. | Midland, TX 79708 | Oil & Gas Operator | Feb 2025 |
| 104 | Cal-Mon Oil Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 105 | Callon Permian II, LLC | Houston, TX 77056 | Oil & Gas Operator | Jul 2024 |
| 106 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 107 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | May 2025 |
| 108 | Cannan, Morris | San Antonio, TX 78205 | Oil & Gas Operator | May 2025 |
| 109 | Capataz Operating Inc | Midland, TX 79702 | Oil & Gas Operator | Sep 2020 |
| 110 | Capps, R. Oil Corp. | Midland, TX 79704 | Oil & Gas Operator | Oct 2002 |
| 111 | Caprock Exploration, Inc. | Monahans, TX 79756 | Oil & Gas Operator | May 2025 |
| 112 | Carlow Corp. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 113 | Cavalcade Operating Company LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2017 |
| 114 | Cazador Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 115 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Feb 2025 |
| 116 | Celero Energy LP | Midland, TX 79701 | Oil & Gas Operator | May 2011 |
| 117 | CH-Seon Inc. | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 118 | Champion Lone Star Operating,LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2020 |
| 119 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Mar 2025 |
| 120 | Chance Properties Co. | Kermit, TX 79745 | Oil & Gas Operator | May 2025 |
| 121 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 122 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2025 |
| 123 | Chapman Oil Company | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 124 | Chase Avenue Corporation, The | Dallas, TX 75219 | Oil & Gas Operator | Jun 2003 |
| 125 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 126 | Chevron Midcontinent, L.P. | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 127 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 128 | Chroma Operating, Inc. | Washington, DC 20036 | Oil & Gas Operator | Jun 2016 |
| 129 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 130 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 131 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 132 | Clayton Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | May 2004 |
| 133 | Clear Brooke Ranches, LLC | Fort Worth, TX 76179 | Oil & Gas Operator | May 2025 |
| 134 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | Jan 2025 |
| 135 | Cochise Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 136 | Cody Company | Amarillo, TX 79121 | Oil & Gas Operator | Mar 2020 |
| 137 | Coert Holdings 1 LLC | Greenwich, CT 06830 | Oil & Gas Operator | Dec 2021 |
| 138 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 139 | Colgate Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 140 | Collins & Ware, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 141 | Comal Operating LLC | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 142 | Concho Resources Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2004 |
| 143 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 144 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 145 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | May 2025 |
| 146 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 147 | Corda Corporation | Wichita Falls, TX 76302 | Oil & Gas Operator | May 2025 |
| 148 | Corkran Energy, LP | Ignacio, CO 81137 | Oil & Gas Operator | May 2013 |
| 149 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 150 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 151 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 152 | Crabtree And Brown, Inc. | Kermit, TX 79745 | Oil & Gas Operator | Feb 1995 |
| 153 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 154 | Custer & Wright Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 155 | D & B Oil Company | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 156 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | May 2025 |
| 157 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 158 | Daniel Oil & Gas | Granbury, TX 76049 | Oil & Gas Operator | Oct 2010 |
| 159 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 160 | De Compiegne Prop. Co. 20, The | Midland, TX 79702 | Oil Operator | Oct 2019 |
| 161 | Delek Energy Systems Us Inc | Denver, CO 80202 | Oil & Gas Operator | Oct 2011 |
| 162 | Delta Oil & Gas Company | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2003 |
| 163 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 164 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 165 | Devon Gas Services, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2015 |
| 166 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 167 | Dewey Petroleum | Midland, TX 79707 | Oil & Gas Operator | Dec 2020 |
| 168 | Diamondback E&P LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 169 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 170 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 171 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Mar 2025 |
| 172 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 173 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Oct 2013 |
| 174 | Double Eagle Operating, LLC | Fort Worth, TX 76113 | Oil & Gas Operator | May 2025 |
| 175 | Double R Oil Co. | Charlotte, TX 78011 | Oil & Gas Operator | May 2010 |
| 176 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 177 | DRH Properties LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2014 |
| 178 | DSR Oil & Gas, Inc. | Monahans, TX 79756 | Oil & Gas Operator | May 2025 |
| 179 | Dudley Oil Co. | Crane, TX 79731 | Oil & Gas Operator | Jan 2006 |
| 180 | Dugan Production Corp | Farmington, NM 87499 | Oil & Gas Operator | Mar 2025 |
| 181 | Dunigan Petroleum, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 182 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 183 | Eado Production, Inc. | Kermit, TX 79745 | Oil & Gas Operator | Aug 2012 |
| 184 | Eagle Capital Partners, LLC | Eunice, NM 88231 | Oil & Gas Operator | May 2025 |
| 185 | Eagle Rock Operating Company,LLC | Houston, TX 77252 | Oil & Gas Operator | Oct 2015 |
| 186 | Earnest Producing Corporation | Midland, TX 79704 | Oil & Gas Operator | May 2025 |
| 187 | Eastland Oil Company, The | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 188 | Eclipse Services, Inc. * | La Grange, TX 78945 | Oil & Gas Operator | Jul 2003 |
| 189 | Edisto Resources Corp | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 190 | Edward Oil Company | Youngsville, PA 16371 | Oil & Gas Operator | Nov 2024 |
| 191 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 192 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Mar 2025 |
| 193 | Elson Oil Company | Tulsa, OK 74103-4429 | Oil & Gas Operator | Dec 2016 |
| 194 | Enable Midstream Partners, LP | Oklahoma City, OK 73124 | Oil Operator | Sep 2023 |
| 195 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 196 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 197 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 198 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 199 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2025 |
| 200 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |