| 101 | Celero Energy LP | Midland, TX 79701 | Oil & Gas Operator | May 2011 |
| 102 | Central Texas Operating, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Aug 2025 |
| 103 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Jun 2025 |
| 104 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Aug 2025 |
| 105 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2025 |
| 106 | Chevron Midcontinent, L.P. | Midland, TX 79706 | Oil & Gas Operator | Aug 2025 |
| 107 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Aug 2025 |
| 108 | Chisos, LTD | Houston, TX 77098 | Oil & Gas Operator | Aug 2025 |
| 109 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Aug 2025 |
| 110 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Aug 2025 |
| 111 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Aug 2025 |
| 112 | Civitas Permian Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Aug 2025 |
| 113 | Clear Water Inc. | Midland, TX 79710 | Oil & Gas Operator | Aug 2025 |
| 114 | Coal Creek Energy, LLC | Overland Park, KS 66221 | Oil Operator | Dec 2019 |
| 115 | Coastal Management Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 116 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Aug 2025 |
| 117 | Cobalt Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Feb 2025 |
| 118 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2025 |
| 119 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 120 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2025 |
| 121 | Collins & Ware, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 122 | Concho Resources Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2004 |
| 123 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 124 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Aug 2025 |
| 125 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 126 | Copper Ridge Resources LLC | Midland, TX 79710 | Oil Operator | Feb 2025 |
| 127 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 128 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 129 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 130 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 131 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 132 | CR3 Operating Company, L.L.C. | Houston, TX 77251 | Oil & Gas Operator | Aug 2025 |
| 133 | Creston Petroleum Corp. | Dallas, TX 75380 | Oil & Gas Operator | Aug 2025 |
| 134 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 135 | Crossfoot Operating, LLC | Houston, TX 77227 | Oil & Gas Operator | Aug 2025 |
| 136 | Crosstex Services, L.L.C. | Tuscola, TX 79562 | Oil Operator | Aug 2025 |
| 137 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Aug 2025 |
| 138 | Custer & Wright Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2025 |
| 139 | Cutbow Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Aug 2025 |
| 140 | Dakota Resources, Inc. (I) | Midland, TX 79707 | Oil & Gas Operator | Aug 2025 |
| 141 | Dallas Operating Corp. | Dallas, TX 75205 | Oil & Gas Operator | Nov 2006 |
| 142 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 143 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 144 | De IV Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 145 | De Operating LLC | Austin, TX 78701 | Oil & Gas Operator | Apr 2017 |
| 146 | De3 Operating LLC | Irving, TX 75038 | Oil & Gas Operator | Jun 2021 |
| 147 | Dean Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2019 |
| 148 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 149 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 150 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2025 |
| 151 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 152 | Devx Operating Company | Frisco, TX 75034 | Oil & Gas Operator | Feb 2004 |
| 153 | Diamondback E&P LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2025 |
| 154 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | Aug 2025 |
| 155 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jun 2025 |
| 156 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Oct 2013 |
| 157 | Double Eagle Operating, LLC | Fort Worth, TX 76113 | Oil & Gas Operator | Aug 2025 |
| 158 | Draco Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2025 |
| 159 | Dugan Production Corp | Farmington, NM 87499 | Oil & Gas Operator | Jun 2025 |
| 160 | Dundee Petroleum, Inc. | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 2003 |
| 161 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 162 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 163 | E.G.L. Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 164 | Eagle Energy Acquisitions LP | Houston, TX 77002 | Oil & Gas Operator | Aug 2014 |
| 165 | Eastland Exploration, Inc. | Austin, TX 78763 | Oil & Gas Operator | Apr 1997 |
| 166 | Edmar Company, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 167 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 168 | Element Petro Operating II, LLC | Midland, TX 79701 | Oil & Gas Operator | Sep 2016 |
| 169 | Element Petroleum Op III, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 170 | Element Petroleum Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2015 |
| 171 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 172 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 173 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 174 | Energex Corp | Springfield, MO 65807 | Oil & Gas Operator | May 2025 |
| 175 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 176 | Energy Production Corporation | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2025 |
| 177 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | May 2025 |
| 178 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | May 2025 |
| 179 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | May 2025 |
| 180 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2025 |
| 181 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 182 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 183 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2025 |
| 184 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 185 | Escondido Bay Corporation | Dallas, TX 75202 | Oil Operator | Aug 2025 |
| 186 | Esperanza Energy Corp. | Prosper, TX 75078 | Oil & Gas Operator | Mar 2015 |
| 187 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 188 | Exchange Exploration & Production Co. | Dallas, TX 75219 | Oil & Gas Operator | May 2025 |
| 189 | Exl Petroleum Operating Inc. | Midland, TX 79705 | Oil & Gas Operator | Feb 2020 |
| 190 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2025 |
| 191 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 192 | Fasken Oil And Ranch, LTD. | Midland, TX 79707 | Oil & Gas Operator | Aug 2025 |
| 193 | Fasken, Barbara | Midland, TX 79701 | Oil & Gas Operator | Dec 1995 |
| 194 | Fed Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2025 |
| 195 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Aug 2025 |
| 196 | Flairtex Resources, Inc. | Houston, TX 77040 | Oil & Gas Operator | Oct 1998 |
| 197 | Flash Gas & Oil Southwest, Inc. | Mandeville, LA 70470 | Oil & Gas Operator | Oct 2019 |
| 198 | Flat Top Operating, LLC | Midland, TX 79707 | Oil & Gas Operator | Aug 2025 |
| 199 | Flying W Resources, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 200 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |