| 101 | Can-Tex Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Nov 2003 |
| 102 | Caprock Exploration, Inc. | Monahans, TX 79756 | Oil & Gas Operator | May 2025 |
| 103 | Caprock Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Dec 2007 |
| 104 | Capstone Natural Res II, LLC | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2020 |
| 105 | Cardwell Oil Corporation | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 106 | Carlow Corp. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 107 | Casper Oil & Gas | Bandera, TX 78003 | Oil & Gas Operator | Oct 2002 |
| 108 | Cass Energy Corp | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 109 | Catoilan Corporation | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 110 | Central Texas Operating, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | May 2025 |
| 111 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | May 2025 |
| 112 | Cherokee DRLG. & Dev. Corp. | Winnetka, IL 60093 | Oil & Gas Operator | Jan 2003 |
| 113 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 114 | Chevron Midcontinent, L.P. | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 115 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 116 | Chi Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 117 | Chisos Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 118 | Circle-S Energy, LLC | McKinney, TX 75071 | Oil & Gas Operator | May 2025 |
| 119 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 120 | Civitas Permian Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 121 | Clayton Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | May 2004 |
| 122 | CLR Secondary Recovery, LLC | Wichita Falls, TX 76306 | Oil & Gas Operator | May 2025 |
| 123 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 124 | CMS Oil And Gas Company | Jackson, MI 49201 | Oil & Gas Operator | Oct 2002 |
| 125 | Coastal Management Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 126 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | Jan 2025 |
| 127 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 128 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 129 | Coert Holdings 1 LLC | Greenwich, CT 06830 | Oil & Gas Operator | Dec 2021 |
| 130 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 131 | Coleville Petroleum Company | McAllen, TX 78503 | Oil & Gas Operator | Mar 1996 |
| 132 | Concho Resources Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2004 |
| 133 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 134 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 135 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | May 2025 |
| 136 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 137 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 138 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | May 2025 |
| 139 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 140 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 141 | Cotton Valley Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2025 |
| 142 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 143 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 144 | Cross Timbers Oil Company | Dallas, TX 75284 | Oil & Gas Operator | May 2013 |
| 145 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 146 | Custer & Wright Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 147 | Cutbow Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 148 | Darkens Oil & Gas Inc. | MC Camey, TX 79752 | Oil & Gas Operator | May 2025 |
| 149 | Day Resources, Inc. | Midland, TX 79707 | Oil & Gas Operator | Aug 1994 |
| 150 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 151 | De IV Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 152 | De Operating LLC | Austin, TX 78701 | Oil & Gas Operator | Apr 2017 |
| 153 | De3 Operating LLC | Irving, TX 75038 | Oil & Gas Operator | Jun 2021 |
| 154 | Dean Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2019 |
| 155 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 156 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 157 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 158 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 159 | Diamondback E&P LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 160 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 161 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 162 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Apr 2025 |
| 163 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Oct 2013 |
| 164 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | May 2025 |
| 165 | Driftwood Energy Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Dec 2022 |
| 166 | Driscoll S.W.D. Inc. | San Antonio, TX 78229 | Oil & Gas Operator | May 2025 |
| 167 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 168 | Dyad Petroleum Company | Midland, TX 79710 | Oil & Gas Operator | Sep 2021 |
| 169 | E & R Oil | San Angelo, TX 76906 | Oil & Gas Operator | May 2025 |
| 170 | Eagle Capital Partners, LLC | Eunice, NM 88231 | Oil & Gas Operator | May 2025 |
| 171 | Eagle Production, Inc. | Abilene, TX 79605 | Oil & Gas Operator | May 2025 |
| 172 | Eagle Rock Operating Company,LLC | Houston, TX 77252 | Oil & Gas Operator | Oct 2015 |
| 173 | Earthstone Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Mar 2025 |
| 174 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 175 | Eggleston, Garaland | Big Lake, TX 76932 | Oil & Gas Operator | Aug 2003 |
| 176 | Elam, Jack G., Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2002 |
| 177 | Ellison Lease Operating | Bridgeport, TX 76426 | Oil & Gas Operator | May 2025 |
| 178 | Emerald Production Company | Midland, TX 79702 | Oil & Gas Operator | Jun 1995 |
| 179 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 180 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 181 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 182 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 183 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Mar 2025 |
| 184 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 185 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2025 |
| 186 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2025 |
| 187 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 188 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 189 | Enwest Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | Aug 1994 |
| 190 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 191 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 192 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 193 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 194 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 195 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 196 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 197 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 198 | Exl Petroleum, LP | Midland, TX 79705 | Oil & Gas Operator | Jun 2017 |
| 199 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 200 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |