| 101 | Cascade Petroleum Corporation | Quitman, TX 75783 | Oil & Gas Operator | Mar 2002 |
| 102 | CDJ Oil Co. | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 103 | Cedar Oil Company | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 104 | Cedar Ridge Energy, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Dec 2025 |
| 105 | Centaur Petroleum Corporation | Fort Worth, TX 76101 | Oil & Gas Operator | Dec 2025 |
| 106 | Central Basin Oil Inv. Inc. | Southlake, TX 76092 | Oil & Gas Operator | Dec 2025 |
| 107 | Centurion Operating Corporation | Rockwall, TX 75087 | Oil & Gas Operator | Dec 2025 |
| 108 | Chalmers Exploration Company | Abilene, TX 79608 | Oil & Gas Operator | Apr 1997 |
| 109 | Chan West Oil Corporation | Irving, TX 75016 | Oil & Gas Operator | Dec 2025 |
| 110 | Charter Petroleum Company | Abilene, TX 79605 | Oil & Gas Operator | Dec 2025 |
| 111 | Chase Operating Company | Abilene, TX 79608 | Oil & Gas Operator | Feb 2016 |
| 112 | Chisholm Exploration | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 113 | Chisholm Operating, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Dec 2025 |
| 114 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 115 | Christian Energy, Inc. | Mandeville, LA 70470 | Oil & Gas Operator | Mar 2008 |
| 116 | Cinnabar Energy, LTD. | Fort Worth, TX 76107 | Oil & Gas Operator | May 2018 |
| 117 | Circle Ridge Production, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 118 | Clear Fork, Incorporated | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 119 | Co Energy | Benbrook, TX 76126 | Oil & Gas Operator | Dec 2025 |
| 120 | Cockrell Production Co., Inc. | Irving, TX 75014 | Oil & Gas Operator | Dec 2025 |
| 121 | Colo Construction Co., Inc. | Abilene, TX 79602 | Oil Operator | Apr 2004 |
| 122 | Colo Exploration Company, Inc. | Benbrook, TX 76126 | Oil & Gas Operator | Dec 2025 |
| 123 | Colt Oil & Gas Co. | Abilene, TX 79601 | Oil Operator | Apr 2004 |
| 124 | Concho Oilfield Service, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2013 |
| 125 | Conquistador Petroleum,Inc. | Coleman, TX 76834 | Oil & Gas Operator | Dec 2025 |
| 126 | Continual Oil & Gas, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Dec 2025 |
| 127 | Contour Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Dec 2015 |
| 128 | Coral E&P, LLC | Adkins, TX 78101 | Oil & Gas Operator | Dec 2025 |
| 129 | Corpening, Joe F. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |
| 130 | Cottonwood Petroleum Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2009 |
| 131 | Couch Oil & Gas, Inc. | Dallas, TX 75229 | Oil & Gas Operator | Dec 2025 |
| 132 | Couch, Gilbert | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 133 | Crego Exploration | Dallas, TX 75243 | Oil & Gas Operator | Dec 2025 |
| 134 | Cremson Oil & Gas | Coleman, TX 76834 | Oil & Gas Operator | Dec 2025 |
| 135 | Croker, Danny | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2025 |
| 136 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 137 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 138 | CRT'S, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Aug 2008 |
| 139 | Crude Production Company | Clyde, TX 79510 | Oil & Gas Operator | Dec 2025 |
| 140 | Cuatro Oil And Gas Corporation | Abilene, TX 79603 | Oil & Gas Operator | Dec 2025 |
| 141 | Cucharas Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Dec 2000 |
| 142 | Culebra Oil & Gas, LLC | Kerrville, TX 78028 | Oil & Gas Operator | Dec 2025 |
| 143 | Cwic, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Dec 2025 |
| 144 | Cypress Partners, Inc. | Houston, TX 77068 | Oil & Gas Operator | May 1999 |
| 145 | D & A Oil Company | Abilene, TX 79606 | Oil & Gas Operator | Oct 2018 |
| 146 | D C Oil Company, Inc. | Sundown, TX 79372 | Oil & Gas Operator | Dec 2025 |
| 147 | D-Bar Leasing, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2022 |
| 148 | D. A. B. Oil Service, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Nov 2012 |
| 149 | D. G. Oil Co. | Dennis, TX 76439 | Oil & Gas Operator | Dec 2025 |
| 150 | D.J. & T. Energy | Abilene, TX 79601 | Oil & Gas Operator | Dec 2025 |
| 151 | D.K.D. | Merkel, TX 79536 | Oil & Gas Operator | Dec 2025 |
| 152 | D.T. Inc. | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 153 | Dahab Energy Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 154 | Davis, Paul Pipe & Supply Inc. | Abilene, TX 79606 | Oil & Gas Operator | Feb 2001 |
| 155 | Del Petroleum Corporation | Dallas, TX 75219 | Oil & Gas Operator | Jan 2012 |
| 156 | Delray Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2025 |
| 157 | Demand Energy, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Jul 1999 |
| 158 | Diler Development Inc. | Garland, TX 75043 | Oil & Gas Operator | Dec 2025 |
| 159 | Dixon Exploration Inc | Abilene, TX 79604 | Oil & Gas Operator | Oct 2019 |
| 160 | DJ & T Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | Dec 2025 |
| 161 | DJM Beasley Well Service | Tuscola, TX 79562 | Oil Operator | Dec 2025 |
| 162 | Dobbs Petroleum Co. | Abilene, TX 79606 | Oil & Gas Operator | Dec 2025 |
| 163 | Domino Operations, Inc. | Abilene, TX 79603 | Oil & Gas Operator | Dec 2025 |
| 164 | Dorondoco Operating Co., Inc. | Brownwood, TX 76801 | Oil & Gas Operator | May 1994 |
| 165 | Double M Petroproperties, Inc. | Haskell, TX 79521 | Oil & Gas Operator | Dec 2025 |
| 166 | Dove Mineral | Abilene, TX 79601 | Oil & Gas Operator | Dec 2010 |
| 167 | DP2, LLC | Southlake, TX 76092 | Oil & Gas Operator | Dec 2025 |
| 168 | Drum, Delton | Liberty, TX 77575 | Oil & Gas Operator | Jul 2005 |
| 169 | Duke, M. L. | Snyder, TX 79549 | Oil & Gas Operator | Mar 2008 |
| 170 | DWR Oil Company | Merkel, TX 79536 | Oil & Gas Operator | Aug 2025 |
| 171 | E & R Oil | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2025 |
| 172 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 173 | Eagle Capital Partners, LLC | Eunice, NM 88231 | Oil & Gas Operator | Dec 2025 |
| 174 | Eagle Natural Resources, LLC | Eunice, NM 88231 | Oil Operator | Dec 2025 |
| 175 | Earthbound Resources LLC | Merkel, TX 79536 | Oil & Gas Operator | Dec 2025 |
| 176 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | Dec 2025 |
| 177 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 178 | Edge Oil And Gas, LLC | Abilene, TX 79602 | Oil Operator | Dec 2025 |
| 179 | Edinburgh Energy Partners, LLC | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 180 | Edwards, Gus Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2004 |
| 181 | Encino Exploration, Inc. | George West, TX 78022 | Oil & Gas Operator | Dec 2025 |
| 182 | Encon Services, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 183 | Energex Inc. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 184 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Aug 2025 |
| 185 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Aug 2025 |
| 186 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 187 | Enr Operating, LLC | Eunice, NM 88231 | Oil & Gas Operator | Dec 2025 |
| 188 | Enrich Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 189 | Eor Operating Company | Houston, TX 77079 | Oil & Gas Operator | Dec 2025 |
| 190 | Eratz Investments Inc. | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 191 | Erson Royalty Company, Inc. | Merkel, TX 79536 | Oil & Gas Operator | Feb 2006 |
| 192 | Erwin, James D. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1993 |
| 193 | Ewt Operating Company | Andrews, TX 79714 | Oil & Gas Operator | Dec 2025 |
| 194 | Ex-Cel Resources, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 195 | Excel Energy, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Dec 2025 |
| 196 | Feagan Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 197 | Federal Oil, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Dec 2025 |
| 198 | Fiesta Energy LLC | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Dec 2025 |
| 199 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 200 | Firerock Company | Abilene, TX 79602 | Oil & Gas Operator | Dec 2025 |