| 101 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 102 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2024 |
| 103 | Charis Oil & Gas, LLC | Addison, TX 75001 | Oil & Gas Operator | May 2024 |
| 104 | Chico Production Corp. | Bowie, TX 76230 | Oil & Gas Operator | May 2024 |
| 105 | Cholla Petroleum, Inc. | Dallas, TX 75225 | Oil & Gas Operator | May 2024 |
| 106 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 107 | Circle B Oil & Gas | Bowie, TX 76230 | Oil & Gas Operator | Dec 2021 |
| 108 | Clear Brooke Ranches, LLC | Fort Worth, TX 76179 | Oil & Gas Operator | May 2024 |
| 109 | Clearfork Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2011 |
| 110 | Clearfork Production, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2018 |
| 111 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 112 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2024 |
| 113 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Feb 2024 |
| 114 | Cody Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | Sep 2002 |
| 115 | Coleman Oil & Gas Corp. | Fort Worth, TX 76109 | Oil & Gas Operator | May 2024 |
| 116 | Cone, Charles M. Services, Inc. | Dallas, TX 75372 | Oil & Gas Operator | Sep 2005 |
| 117 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 118 | Continental Exploration LLC | Lufkin, TX 75915 | Oil & Gas Operator | May 2024 |
| 119 | Continental Export Corporation | Bowie, TX 76230 | Oil & Gas Operator | Sep 2013 |
| 120 | Cooke & Montague Oper. Co., Inc. | Flower Mound, TX 75028 | Oil & Gas Operator | May 2024 |
| 121 | Cope Oil Company | Valley VIew, TX 76272 | Oil & Gas Operator | Feb 2015 |
| 122 | Coral E&P, LLC | Adkins, TX 78101 | Oil & Gas Operator | May 2024 |
| 123 | Corda Corporation | Wichita Falls, TX 76302 | Oil & Gas Operator | May 2024 |
| 124 | Coreterra Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | May 2024 |
| 125 | Corpening, Joe F. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |
| 126 | Cotton Valley Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2024 |
| 127 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 128 | Couch, Harry L. | Odessa, TX 79762 | Oil & Gas Operator | Nov 1994 |
| 129 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 130 | CP Energy LLC | Edmond, OK 73034 | Oil Operator | Feb 2024 |
| 131 | CR Reed Production, Inc. | Gainesville, TX 76241 | Oil Operator | May 2024 |
| 132 | Creed Operating Co., LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | May 2024 |
| 133 | Crest Operating Company | Houston, TX 77042 | Oil & Gas Operator | May 2024 |
| 134 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 135 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 136 | CTL Production, Inc. | Muenster, TX 76252 | Oil & Gas Operator | May 2024 |
| 137 | Cuervo, Inc. | FT Stockton, TX 79735 | Oil & Gas Operator | May 2024 |
| 138 | Dahab Energy Inc. | Dallas, TX 75225 | Oil & Gas Operator | May 2024 |
| 139 | Dallas Production Company LLC | Dallas, TX 75206 | Oil & Gas Operator | May 2024 |
| 140 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 141 | Dark Horse Operating Co., L.L.C. | Denton, TX 76202 | Oil & Gas Operator | Oct 2022 |
| 142 | Davis & Salmon | Muenster, TX 76252 | Oil & Gas Operator | Oct 2017 |
| 143 | Davis, Don Oil Co. | Nocona, TX 76255 | Oil & Gas Operator | May 2024 |
| 144 | Davis, Kelly J. | Muenster, TX 76252 | Oil Operator | May 2024 |
| 145 | Davis, Odis Oil Company | Nocona, TX 76255 | Oil & Gas Operator | Dec 2000 |
| 146 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 147 | Deen Drilling Company | Archer City, TX 76351 | Oil & Gas Operator | May 2024 |
| 148 | Delwintex Oil & Gas Prop., Inc. | Lubbock, TX 79423 | Oil & Gas Operator | Aug 2003 |
| 149 | Dennis & Davis Oil Co | Nocona, TX 76255 | Oil & Gas Operator | May 2024 |
| 150 | Dennis, Don | Grady, OK 73545 | Oil & Gas Operator | Mar 1998 |
| 151 | Denteco Oil Company LLC | Abilene, TX 79604 | Oil & Gas Operator | May 2024 |
| 152 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | May 2024 |
| 153 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 154 | Dimock Operating Company | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2024 |
| 155 | DJ Resources Inc | Bowie, TX 76230 | Oil & Gas Operator | Nov 2017 |
| 156 | Doc'S Tank Trucks | Jacksboro, TX 76458 | Oil Operator | Jun 2007 |
| 157 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | May 2024 |
| 158 | Dry Creek Operating, LLC | Fort Worth, TX 76109 | Oil & Gas Operator | May 2024 |
| 159 | DSB Energy, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2024 |
| 160 | Duke, M.A. "Andy", Jr. | Montague, TX 76251 | Oil & Gas Operator | Jun 2023 |
| 161 | Dune Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 2016 |
| 162 | DWP Oil & Gas | Wichita Falls, TX 76309 | Oil & Gas Operator | May 2024 |
| 163 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | May 2024 |
| 164 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | May 2024 |
| 165 | Ebs Oil & Gas Partners Op.Co.,LP | Dallas, TX 75219 | Oil & Gas Operator | May 2006 |
| 166 | Edge, Fred Well Service Co. | Archer City, TX 76351 | Oil & Gas Operator | May 2024 |
| 167 | Eldred Prod And Consulting, LLC | Nocona, TX 76255 | Oil Operator | May 2024 |
| 168 | Eleon Operators, LLC | Katy, TX 77494 | Oil & Gas Operator | May 2024 |
| 169 | Emerald Petroleum Corporation | Dallas, TX 75244 | Oil & Gas Operator | Apr 2002 |
| 170 | Empire Oil Company | Coppell, TX 75019 | Oil & Gas Operator | May 2024 |
| 171 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 172 | Encore Energy, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 173 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 174 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 175 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 176 | Enre LP | Kingwood, TX 77339 | Oil & Gas Operator | Feb 2004 |
| 177 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 178 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 179 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 180 | Esp Energy, LLC | Nocona, TX 76255 | Oil Operator | May 2024 |
| 181 | Everest Energy LLC | Graham, TX 76450 | Oil & Gas Operator | Jun 2023 |
| 182 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | May 2024 |
| 183 | Exit Oil & Gas | Flower Mound, TX 75028 | Oil & Gas Operator | May 2024 |
| 184 | Extech Operating, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | May 2024 |
| 185 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | May 2024 |
| 186 | F B Operating, Inc. | Montague, TX 76251 | Oil & Gas Operator | Aug 2003 |
| 187 | Fagadau Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2006 |
| 188 | Fair Oil, LTD. | Tyler, TX 75710 | Oil & Gas Operator | May 2024 |
| 189 | Federal Energy Development Co. | Dallas, TX 75205 | Oil & Gas Operator | Mar 2011 |
| 190 | Felderhoff Production Company | Muenster, TX 76252 | Oil & Gas Operator | May 2024 |
| 191 | Fenoglio Oil Company | Nocona, TX 76255 | Oil Operator | May 2024 |
| 192 | Fenoglio, Donnie Oil Company | Nocona, TX 76255 | Oil & Gas Operator | Feb 2014 |
| 193 | Fidelity Petroleum Corporation | Plano, TX 75074 | Oil & Gas Operator | May 2024 |
| 194 | Field Production Company | Cleburne, TX 76033 | Oil & Gas Operator | Mar 2023 |
| 195 | Finnell Oil Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2009 |
| 196 | Fitts, B.K. Oil & Gas | Bowie, TX 76230 | Oil & Gas Operator | May 2024 |
| 197 | Flusche Brothers | Muenster, TX 76252 | Oil & Gas Operator | May 2024 |
| 198 | Ford, R. J. Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | May 2024 |
| 199 | Fortson Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2020 |
| 200 | Fullspike Energy LLC | Boyd, TX 76023 | Oil & Gas Operator | May 2024 |