| 101 | Celero Energy LP | Midland, TX 79701 | Oil & Gas Operator | May 2011 |
| 102 | Centex Development | Giddings, TX 78942 | Oil & Gas Operator | Feb 2026 |
| 103 | Central Energy Producing Company | San Antonio, TX 78217 | Oil & Gas Operator | Sep 2003 |
| 104 | CG&St Energy Services | Eastland, TX 76448 | Oil & Gas Operator | Oct 1999 |
| 105 | Chalmers Exploration Company | Abilene, TX 79608 | Oil & Gas Operator | Apr 1997 |
| 106 | Chambers, R. H. | Abilene, TX 79606 | Oil & Gas Operator | Apr 2006 |
| 107 | Chapman Oil Company | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 108 | Charter Petroleum Company | Abilene, TX 79605 | Oil & Gas Operator | Feb 2026 |
| 109 | Chief Operating Company | Houston, TX 77070 | Oil & Gas Operator | Feb 2004 |
| 110 | Chiodo Corp. | San Antonio, TX 78232 | Oil & Gas Operator | Feb 2026 |
| 111 | Chisholm Operating, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Feb 2026 |
| 112 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 113 | Clark, B. C. | Cross Plains, TX 76443 | Oil Operator | Dec 2007 |
| 114 | Clausen, A. G. | Cross Plains, TX 76443 | Oil & Gas Operator | Feb 2026 |
| 115 | Clavo Oil, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 116 | Clear Fork, Incorporated | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 117 | Cobalt Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Feb 2025 |
| 118 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 119 | Cockrell Production Co., Inc. | Irving, TX 75014 | Oil & Gas Operator | Feb 2026 |
| 120 | Colo Construction Co., Inc. | Abilene, TX 79602 | Oil Operator | Apr 2004 |
| 121 | Colo Exploration Company, Inc. | Benbrook, TX 76126 | Oil & Gas Operator | Feb 2026 |
| 122 | Concho Oilfield Service, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2013 |
| 123 | Conquistador Petroleum,Inc. | Coleman, TX 76834 | Oil & Gas Operator | Feb 2026 |
| 124 | Consolidated Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 125 | Continual Oil & Gas, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Feb 2026 |
| 126 | Contour Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Dec 2015 |
| 127 | Copper Ridge Resources LLC | Midland, TX 79710 | Oil Operator | Feb 2025 |
| 128 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 129 | Couch Oil & Gas, Inc. | Dallas, TX 75229 | Oil & Gas Operator | Feb 2026 |
| 130 | Couch, Gilbert | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 131 | Cox, H. L. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jan 2011 |
| 132 | Cremson Oil & Gas | Coleman, TX 76834 | Oil & Gas Operator | Feb 2026 |
| 133 | Creston Petroleum Corp. | Dallas, TX 75380 | Oil & Gas Operator | Feb 2026 |
| 134 | Crosstex Services, L.L.C. | Tuscola, TX 79562 | Oil Operator | Feb 2026 |
| 135 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 136 | CRT'S, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Aug 2008 |
| 137 | Crude Production Company | Clyde, TX 79510 | Oil & Gas Operator | Feb 2026 |
| 138 | Cuatro Oil And Gas Corporation | Abilene, TX 79603 | Oil & Gas Operator | Feb 2026 |
| 139 | Cumberland Petroleum, Inc. II | Weatherford, TX 76086 | Oil & Gas Operator | May 1997 |
| 140 | Cwic, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Feb 2026 |
| 141 | Cwo Energy, LLC | Midland, TX 79705 | Oil Operator | Feb 2026 |
| 142 | Cyber Enviro-Tech Inc | San Tan Valley, AZ 85144 | Oil & Gas Operator | Feb 2026 |
| 143 | D-Bar Leasing, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2022 |
| 144 | D-T Development Company | Richardson, TX 75081 | Oil & Gas Operator | Sep 2002 |
| 145 | D. A. B. Oil Service, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Nov 2012 |
| 146 | D.J. & T. Energy | Abilene, TX 79601 | Oil & Gas Operator | Feb 2026 |
| 147 | D.J.F. Services, Inc. | Holdenville, OK 74848 | Oil & Gas Operator | Feb 2026 |
| 148 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 149 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 150 | Dallas Royalty, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2012 |
| 151 | Dark Canyon Resources LLC | Refugio, TX 78377 | Oil Operator | Feb 2026 |
| 152 | DBC Operating Company LLC | Midlothian, TX 76065 | Oil & Gas Operator | Feb 2026 |
| 153 | Delray Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2026 |
| 154 | Delta Hydrocarbons, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Sep 1997 |
| 155 | Demand Energy, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Jul 1999 |
| 156 | Denteco Oil Company LLC | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 157 | Diamond S Masada LLC | Magnolia, TX 77354 | Oil & Gas Operator | Feb 2026 |
| 158 | Diller Oil Company | Baird, TX 79504 | Oil Operator | Feb 2026 |
| 159 | Discovery Petroleum, L.L.C. | Alice, TX 78333 | Oil & Gas Operator | Feb 2026 |
| 160 | Dixon Exploration Inc | Abilene, TX 79604 | Oil & Gas Operator | Oct 2019 |
| 161 | DJ & T Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | Feb 2026 |
| 162 | DJM Beasley Well Service | Tuscola, TX 79562 | Oil Operator | Feb 2026 |
| 163 | Dodson, Wayne Consultants, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Jul 2003 |
| 164 | Douglas Investments Inc | Fort Worth, TX 76137 | Oil Operator | Jan 2020 |
| 165 | Dove Creek Energy, Inc. | Fort Worth, TX 76121 | Oil & Gas Operator | Feb 2026 |
| 166 | Drillogix Exploration LLC | Breckenridge, TX 76424 | Oil Operator | Feb 2026 |
| 167 | Drum Oil & Gas, Inc. | Houston, TX 77082 | Oil & Gas Operator | Feb 2026 |
| 168 | Drum, Delton | Liberty, TX 77575 | Oil & Gas Operator | Jul 2005 |
| 169 | Duke, M. L. | Snyder, TX 79549 | Oil & Gas Operator | Mar 2008 |
| 170 | Duncan Energy LLC | Dallas, TX 75231 | Oil & Gas Operator | Feb 2026 |
| 171 | Durango Operating Co., Inc. | Abilene, TX 79604 | Oil & Gas Operator | Feb 2002 |
| 172 | DWR Oil Company | Merkel, TX 79536 | Oil & Gas Operator | Aug 2025 |
| 173 | Dyne Oil & Gas,Inc. | Borger, TX 79008 | Oil & Gas Operator | Dec 2017 |
| 174 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 175 | Eagle Natural Resources, LLC | Eunice, NM 88231 | Oil Operator | Feb 2026 |
| 176 | Eastco Gas Co. | Midland, TX 79707 | Oil & Gas Operator | Oct 1999 |
| 177 | Eastland Operating, L.L.C. | Ranger, TX 76470 | Oil & Gas Operator | Feb 2026 |
| 178 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 179 | Eclipse Oil & Gas, Inc. | Midland, TX 79703 | Oil & Gas Operator | Feb 2026 |
| 180 | Eddie'S Royalties, Inc. | Rising Star, TX 76471 | Oil & Gas Operator | Feb 2026 |
| 181 | Edwards, James | Albany, TX 76430 | Oil & Gas Operator | Sep 2000 |
| 182 | El Dorado Resources Inc. | Waco, TX 76710 | Oil & Gas Operator | Oct 2009 |
| 183 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Dec 2025 |
| 184 | Emerald Oil & Gas LC | Fort Worth, TX 76109 | Oil & Gas Operator | Feb 2026 |
| 185 | Emerald Production Company | Midland, TX 79702 | Oil & Gas Operator | Jun 1995 |
| 186 | Encon Services, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 187 | Encore Energy, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 188 | Enerdril Corporation | Moran, TX 76464 | Gas Operator | Dec 2015 |
| 189 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Nov 2025 |
| 190 | Enr Operating, LLC | Eunice, NM 88231 | Oil & Gas Operator | Feb 2026 |
| 191 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 192 | Enre, L.P. | Kingwood, TX 77339 | Oil & Gas Operator | Feb 2004 |
| 193 | Enrich Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 194 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 195 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 196 | Eubank, Robert B. & B. K. | Spring, TX 77388 | Oil & Gas Operator | Mar 2008 |
| 197 | Evarado Oil Company | Strawn, TX 76475 | Oil & Gas Operator | Feb 2026 |
| 198 | Ewt Operating Company | Andrews, TX 79714 | Oil & Gas Operator | Feb 2026 |
| 199 | Ex-Cel Resources, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 200 | Expanding Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |