| 101 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2025 |
| 102 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 103 | Chevron Midcontinent, L.P. | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 104 | Chevron Pipe Line Company | Houston, TX 77001 | Oil Operator | Feb 2015 |
| 105 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 106 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 107 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 108 | Civitas Permian Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 109 | Clear Fork, Incorporated | Abilene, TX 79604 | Oil & Gas Operator | May 2025 |
| 110 | Clear Water Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 111 | CMS Oil And Gas Company | Jackson, MI 49201 | Oil & Gas Operator | Oct 2002 |
| 112 | Coastal Management Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 113 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 114 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | Jan 2025 |
| 115 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 116 | Coert Holdings 1 LLC | Greenwich, CT 06830 | Oil & Gas Operator | Dec 2021 |
| 117 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 118 | Collins & Ware, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 119 | Comstock Energy, LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | May 2025 |
| 120 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 121 | Concho Resources Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2004 |
| 122 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 123 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | May 2025 |
| 124 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | May 2025 |
| 125 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | May 2025 |
| 126 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 127 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 128 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 129 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 130 | CR3 Operating Company, L.L.C. | Houston, TX 77251 | Oil & Gas Operator | May 2025 |
| 131 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 132 | Cutbow Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 133 | Dacott Oil & Gas, LLC | Pampa, TX 79065 | Oil & Gas Operator | Sep 2011 |
| 134 | Dakota Resources, Inc | Midland, TX 79707 | Oil & Gas Operator | Jan 2025 |
| 135 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 136 | Davis & Carr Energy Co. | Midland, TX 79702 | Oil & Gas Operator | Jun 1994 |
| 137 | Dawson Operating Company | Midland, TX 79702 | Oil & Gas Operator | Dec 1994 |
| 138 | Day Resources, Inc. | Midland, TX 79707 | Oil & Gas Operator | Aug 1994 |
| 139 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 140 | De IV Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 141 | De Operating LLC | Austin, TX 78701 | Oil & Gas Operator | Apr 2017 |
| 142 | De3 Operating LLC | Irving, TX 75038 | Oil & Gas Operator | Jun 2021 |
| 143 | Dean Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2019 |
| 144 | Desana Development Corporation | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 145 | Desert Production, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 146 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 147 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 148 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 149 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 150 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | May 2025 |
| 151 | Diamondback E&P LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 152 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 153 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Apr 2025 |
| 154 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 155 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Oct 2013 |
| 156 | Double Eagle Operating, LLC | Fort Worth, TX 76113 | Oil & Gas Operator | May 2025 |
| 157 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | May 2025 |
| 158 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 159 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 160 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | May 2025 |
| 161 | E R Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 162 | E.G.L. Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 163 | Earthstone Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Mar 2025 |
| 164 | Edmar Company, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 165 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 166 | El Tres Exploration | Houston, TX 77098 | Oil & Gas Operator | Mar 2008 |
| 167 | Ellora LLC | Boulder, CO 80308 | Oil & Gas Operator | Feb 2010 |
| 168 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 169 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 170 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 171 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 172 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 173 | Enertex, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 174 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 175 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 176 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 177 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 178 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 179 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 180 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 181 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 182 | Exl Petroleum, LP | Midland, TX 79705 | Oil & Gas Operator | Jun 2017 |
| 183 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 184 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 185 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 186 | Famcor Oil, Inc. | Scottsdale, AZ 85260 | Oil & Gas Operator | Sep 2020 |
| 187 | Fasken Oil And Ranch, LTD. | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 188 | Fasken, Barbara | Midland, TX 79701 | Oil & Gas Operator | Dec 1995 |
| 189 | FDL Operating, LLC | Judson, TX 75660 | Oil & Gas Operator | May 2025 |
| 190 | Firebird Energy II LLC | Fort Worth, TX 76107 | Oil & Gas Operator | May 2025 |
| 191 | Firebird Energy LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2022 |
| 192 | First Reserve Oil & Gas Co | Houston, TX 77002 | Oil & Gas Operator | Apr 2000 |
| 193 | Fivestones Energy LLC | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 194 | Flat Top Operating, LLC | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 195 | Floyd Oil Company | Houston, TX 77002 | Oil & Gas Operator | Nov 1999 |
| 196 | Floyd, Timber Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 197 | Flying W Resources, LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 198 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 199 | Forest Oil Permian Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 200 | Forge Energy, LLC | San Antonio, TX 78249 | Oil & Gas Operator | Apr 2019 |