| 101 | Caswell Bros. Oil Co. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2025 |
| 102 | CD Consulting & Operating Co. | Bridgeport, TX 76426 | Oil & Gas Operator | Oct 2025 |
| 103 | Century Petroleum, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Oct 2025 |
| 104 | Chasla Energy, LLC | Iowa Park, TX 76367 | Oil Operator | Oct 2025 |
| 105 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 106 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 107 | Circle Ridge Production, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 108 | Clark Operating | Wichita Falls, TX 76308 | Oil & Gas Operator | Aug 2003 |
| 109 | Clear Brooke Ranches, LLC | Fort Worth, TX 76179 | Oil & Gas Operator | Oct 2025 |
| 110 | Clearfork Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2011 |
| 111 | Clearfork Production, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2018 |
| 112 | Cleo Oil, Inc. | Olney, TX 76374 | Oil & Gas Operator | May 1997 |
| 113 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 114 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 115 | Cole, Frank W Engineering | Dallas, TX 75254 | Oil & Gas Operator | Mar 2006 |
| 116 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 117 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 118 | Continental Export Corporation | Bowie, TX 76230 | Oil & Gas Operator | Sep 2013 |
| 119 | Cooke & Montague Oper. Co., Inc. | Flower Mound, TX 75028 | Oil & Gas Operator | Oct 2025 |
| 120 | Cooper Oil & Gas, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Oct 2025 |
| 121 | Corda Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 122 | Corpening, Joe F. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |
| 123 | Covenant Operating, LLC | Wichita Falls, TX 76308 | Oil Operator | Oct 2025 |
| 124 | Cox Operating Co. | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2000 |
| 125 | Coyote Operating, LLC | Graham, TX 76450 | Oil Operator | Oct 2025 |
| 126 | CP Exploration TX Operating LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2017 |
| 127 | Crenshaw, K. M. | Wichita Falls, TX 76308 | Oil & Gas Operator | Aug 2018 |
| 128 | Crest Operating Company | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 129 | Croker, Danny | Wichita Falls, TX 76302 | Oil & Gas Operator | Oct 2025 |
| 130 | Crump Operating | Henrietta, TX 76365 | Oil & Gas Operator | Oct 2025 |
| 131 | Crutcher Oil Properties | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 2025 |
| 132 | Cundiff Operating Company | Dallas, TX 75238 | Oil & Gas Operator | Oct 2025 |
| 133 | Custer & Wright Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 134 | D & S Oil Company | Corsicana, TX 75151 | Oil & Gas Operator | Oct 2025 |
| 135 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 136 | Dahlia Operating LLC | Petrolia, TX 76377 | Oil & Gas Operator | Apr 2018 |
| 137 | Dallas Petroleum Group, LLC | Dallas, TX 75379 | Oil & Gas Operator | Oct 2025 |
| 138 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 139 | Davis, Gowin | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2001 |
| 140 | Dawson, B G Oil & Gas LTD | Dallas, TX 75205 | Oil & Gas Operator | Jul 2024 |
| 141 | DDC Production Company | Archer City, TX 76351 | Oil Operator | Oct 2025 |
| 142 | De Larios, R. V., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 143 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 144 | Deen Drilling Company | Archer City, TX 76351 | Oil & Gas Operator | Oct 2025 |
| 145 | Delek Energy Systems Us Inc | Denver, CO 80202 | Oil & Gas Operator | Oct 2011 |
| 146 | Demers - Fleming | Wichita Falls, TX 76305 | Oil & Gas Operator | Mar 2008 |
| 147 | Demers Oil Production | Byers, TX 76357 | Oil & Gas Operator | Apr 2002 |
| 148 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Oct 2025 |
| 149 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | Oct 2025 |
| 150 | Diamond Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Aug 2010 |
| 151 | Dixie Drilling Company, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Nov 2011 |
| 152 | DJ Resources Inc | Bowie, TX 76230 | Oil & Gas Operator | Nov 2017 |
| 153 | DJD Drilling Corporation | Graham, TX 76450 | Oil Operator | Jan 2010 |
| 154 | DM Backhoe Service | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 155 | Dominion Natural Resources LLC | Dallas, TX 75367 | Oil & Gas Operator | Oct 2025 |
| 156 | Double Barrel Operating Limited Liability Company | Wichita Falls, TX 76308 | Oil Operator | Oct 2025 |
| 157 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Oct 2025 |
| 158 | Double S Operating Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 159 | Dove Creek Resources, LLC | Arlington, TX 76012 | Oil Operator | Oct 2025 |
| 160 | Dry Creek Operating, LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2025 |
| 161 | Dry Fork Production Co | Wichita Falls, TX 76301 | Oil Operator | Apr 2003 |
| 162 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 163 | DWP Oil & Gas | Wichita Falls, TX 76309 | Oil & Gas Operator | Oct 2025 |
| 164 | Dym Energy, Inc. | Celina, TX 75009 | Oil & Gas Operator | Apr 2018 |
| 165 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Oct 2025 |
| 166 | E & E Construction Company | Wichita Falls, TX 76308 | Oil Operator | Oct 2025 |
| 167 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 168 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 169 | Eclipse Services, Inc. * | La Grange, TX 78945 | Oil & Gas Operator | Jul 2003 |
| 170 | Efficiency Operating Service | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 171 | Eleon Operators, LLC | Katy, TX 77494 | Oil & Gas Operator | Oct 2025 |
| 172 | Emerald Petroleum Corporation | Dallas, TX 75244 | Oil & Gas Operator | Apr 2002 |
| 173 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 174 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | May 2025 |
| 175 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 176 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 177 | Enre LP | Kingwood, TX 77339 | Oil & Gas Operator | Feb 2004 |
| 178 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 179 | Enstar Energy, Inc. | Arlington, TX 76003 | Oil & Gas Operator | Oct 2025 |
| 180 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 181 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 182 | Ericksen, W.R. | Hobbs, NM 88240 | Oil & Gas Operator | Nov 1993 |
| 183 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jun 2025 |
| 184 | Exit Oil & Gas | Flower Mound, TX 75028 | Oil & Gas Operator | Oct 2025 |
| 185 | Exlco, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 186 | Exmoor Oil & Minerals Corp. | Dallas, TX 75225 | Oil & Gas Operator | May 1994 |
| 187 | Exorare Energy, Inc. | Dallas, TX 75218 | Oil & Gas Operator | Oct 2025 |
| 188 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Oct 2025 |
| 189 | Extech Operating, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | Oct 2025 |
| 190 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Jul 2025 |
| 191 | F B Operating, Inc. | Montague, TX 76251 | Oil & Gas Operator | Aug 2003 |
| 192 | Fagadau Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2006 |
| 193 | Falcon Operating Company | Wichita Falls, TX 76302 | Gas Operator | Jan 2000 |
| 194 | Farmer Operating, LLC | Olney, TX 76374 | Oil & Gas Operator | Dec 2019 |
| 195 | Farmer, Hayden | Olney, TX 76374 | Oil & Gas Operator | Feb 1997 |
| 196 | Farmer, Lewis & Hayden | Olney, TX 76374 | Oil & Gas Operator | Oct 2008 |
| 197 | Farmers Of Tulsa Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Sep 1997 |
| 198 | Federal Energy Development Co. | Dallas, TX 75205 | Oil & Gas Operator | Mar 2011 |
| 199 | Felderhoff Production Company | Muenster, TX 76252 | Oil & Gas Operator | Oct 2025 |
| 200 | Felty Drilling Co. Inc | Burkburnett, TX 76354 | Oil & Gas Operator | Oct 2025 |