| 101 | Central Energy Producing Company | San Antonio, TX 78217 | Oil & Gas Operator | Sep 2003 |
| 102 | Chalmers Exploration Company | Abilene, TX 79608 | Oil & Gas Operator | Apr 1997 |
| 103 | Chambers, R. H. | Abilene, TX 79606 | Oil & Gas Operator | Apr 2006 |
| 104 | Chambers, R. H. LLC | Abilene, TX 79606 | Oil & Gas Operator | Apr 2025 |
| 105 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2024 |
| 106 | Chiodo Corp. | San Antonio, TX 78232 | Oil & Gas Operator | Apr 2025 |
| 107 | Chisholm Exploration | Abilene, TX 79604 | Oil & Gas Operator | Apr 2025 |
| 108 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Apr 2025 |
| 109 | Clavo Oil, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 110 | Clear Fork Gas Company | Albany, TX 76430 | Oil & Gas Operator | Apr 2025 |
| 111 | Clear Fork, Incorporated | Abilene, TX 79604 | Oil & Gas Operator | Apr 2025 |
| 112 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2025 |
| 113 | Cole, Frank W Engineering | Dallas, TX 75254 | Oil & Gas Operator | Mar 2006 |
| 114 | Coleman & Johnson Oil Company | Brownwood, TX 76801 | Oil & Gas Operator | Apr 2025 |
| 115 | Colt Oil & Gas Co. | Abilene, TX 79601 | Oil Operator | Apr 2004 |
| 116 | Comanche Oil And Gas Company | Brownwood, TX 76801 | Oil & Gas Operator | Apr 2025 |
| 117 | Comanche Well Service Corp. | Plano, TX 75093 | Oil & Gas Operator | Apr 2025 |
| 118 | Concho Oilfield Service, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2013 |
| 119 | Continual Oil & Gas, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Apr 2025 |
| 120 | Cooper Oil & Gas, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2025 |
| 121 | Corsicana Field Fund | Corsicana, TX 75110 | Oil & Gas Operator | Dec 1993 |
| 122 | Cottonwood Petroleum Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2009 |
| 123 | Couch Oil & Gas, Inc. | Dallas, TX 75229 | Oil & Gas Operator | Apr 2025 |
| 124 | Cox, Lee Investments Inc. | Mineral Wells, TX 76067 | Oil & Gas Operator | Apr 2025 |
| 125 | Coyote Oil Company | Lufkin, TX 75915 | Oil & Gas Operator | Sep 1996 |
| 126 | Crazy Horse Operating LLC | Austin, TX 78731 | Oil & Gas Operator | Apr 2025 |
| 127 | Crosspoint Energy Company | Dallas, TX 75205 | Oil & Gas Operator | Oct 2007 |
| 128 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Apr 2025 |
| 129 | Crude Production Company | Clyde, TX 79510 | Oil & Gas Operator | Apr 2025 |
| 130 | Crystal River Oil & Gas LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jan 2023 |
| 131 | Cuatro Oil And Gas Corporation | Abilene, TX 79603 | Oil & Gas Operator | Apr 2025 |
| 132 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2025 |
| 133 | Cwic, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Apr 2025 |
| 134 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 135 | D-Bar Leasing, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2022 |
| 136 | D. A. B. Oil Service, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Nov 2012 |
| 137 | D.J. & T. Energy | Abilene, TX 79601 | Oil & Gas Operator | Apr 2025 |
| 138 | D.J.F. Services, Inc. | Holdenville, OK 74848 | Oil & Gas Operator | Apr 2025 |
| 139 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 140 | Dahab Energy Inc. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2025 |
| 141 | Dalf Energy LLC | Pampa, TX 79066 | Oil & Gas Operator | Apr 2025 |
| 142 | Dallas Operating Corp. | Dallas, TX 75205 | Oil & Gas Operator | Nov 2006 |
| 143 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 144 | Dark Canyon Resources LLC | Refugio, TX 78377 | Oil Operator | Apr 2025 |
| 145 | Davis Enterprises | Abilene, TX 79608 | Oil & Gas Operator | Aug 1998 |
| 146 | Davis, Sammy | Albany, TX 76430 | Oil & Gas Operator | Apr 2025 |
| 147 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Apr 2025 |
| 148 | DBC Operating Company LLC | Midlothian, TX 76065 | Oil & Gas Operator | Apr 2025 |
| 149 | DCS Energy | Throckmorton, TX 76483 | Oil Operator | Apr 2025 |
| 150 | Deen Drilling Company | Archer City, TX 76351 | Oil & Gas Operator | Apr 2025 |
| 151 | Deep Gully Oil LLC | Houston, TX 77292 | Oil Operator | Apr 2025 |
| 152 | Delray Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2025 |
| 153 | Delta Oil & Gas Company | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2003 |
| 154 | Delta Oil & Gas LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2025 |
| 155 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 156 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 157 | DH Operating, Inc. | Gordon, TX 76453 | Oil & Gas Operator | Apr 2025 |
| 158 | DH Production | Albany, TX 76430 | Oil Operator | Dec 2005 |
| 159 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Apr 2025 |
| 160 | Dino Operating LLC | Throckmorton, TX 76483 | Oil Operator | Apr 2025 |
| 161 | DJ & T Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | Apr 2025 |
| 162 | DJM Beasley Well Service | Tuscola, TX 79562 | Oil Operator | Apr 2025 |
| 163 | Dove Mineral | Abilene, TX 79601 | Oil & Gas Operator | Dec 2010 |
| 164 | DP2, LLC | Southlake, TX 76092 | Oil & Gas Operator | Apr 2025 |
| 165 | Dragoon Oil & Gas Co. | Fort Worth, TX 76147 | Oil & Gas Operator | May 2015 |
| 166 | DRH Properties LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2014 |
| 167 | Drum, Delton | Liberty, TX 77575 | Oil & Gas Operator | Jul 2005 |
| 168 | Durango Operating Co., Inc. | Abilene, TX 79604 | Oil & Gas Operator | Feb 2002 |
| 169 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Apr 2025 |
| 170 | E Z Land & Cattle Company, LLC | Albany, TX 76430 | Oil Operator | Apr 2025 |
| 171 | E. & H. Oil Company | Woodson, TX 76491 | Oil & Gas Operator | May 1998 |
| 172 | E.C. Hindman Oil And Gas | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 173 | Eastland Exploration, Inc. | Austin, TX 78763 | Oil & Gas Operator | Apr 1997 |
| 174 | Edington Oil Company | Albany, TX 76430 | Oil & Gas Operator | Aug 2006 |
| 175 | Edmondson Oil & Gas | Ballinger, TX 76821 | Oil & Gas Operator | Apr 2025 |
| 176 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 177 | Eex Operating, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 178 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 179 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Jan 2025 |
| 180 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 181 | Enrich Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 2025 |
| 182 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 183 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 184 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 185 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 186 | Ex-Cel Resources, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2025 |
| 187 | Exp, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 2003 |
| 188 | Expanding Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 189 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Apr 2025 |
| 190 | F & R Oil Co. | Dallas, TX 75205 | Oil & Gas Operator | May 2005 |
| 191 | Fagadau Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2006 |
| 192 | Fidelity Petroleum Corporation | Plano, TX 75074 | Oil & Gas Operator | Apr 2025 |
| 193 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 194 | First American Operating Co. | Breckenridge, TX 76424 | Oil & Gas Operator | Aug 2006 |
| 195 | Fiscus Drilling Co., Inc. | Clyde, TX 79510 | Oil & Gas Operator | Apr 2015 |
| 196 | Foag, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2022 |
| 197 | Foster, Charles R. Co. | Haskell, TX 79521 | Oil & Gas Operator | Aug 2002 |
| 198 | Four H Oil Properties | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 199 | Frazier, VIolet H. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2014 |
| 200 | Frontier Operating Corporation | Albany, TX 76430 | Oil & Gas Operator | Apr 2025 |