| 101 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Mar 2025 |
| 102 | Clark, B. C. | Cross Plains, TX 76443 | Oil Operator | Dec 2007 |
| 103 | Clear Brooke Ranches, LLC | Fort Worth, TX 76179 | Oil & Gas Operator | Mar 2025 |
| 104 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 105 | Coastline Operating, L.L.C. | Houston, TX 77027 | Oil & Gas Operator | Dec 2006 |
| 106 | Cobalt Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Jul 2024 |
| 107 | Comyn Natural Gas, Inc. | Fort Worth, TX 76163 | Oil & Gas Operator | Mar 2025 |
| 108 | Concho Oilfield Service, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2013 |
| 109 | Cone & Petree Oil & Gas Exp. Inc | Lubbock, TX 79453 | Oil & Gas Operator | May 2024 |
| 110 | Conquistador Petroleum,Inc. | Coleman, TX 76834 | Oil & Gas Operator | Mar 2025 |
| 111 | Continental U.S. Management Corp | Dallas, TX 75240 | Oil & Gas Operator | Oct 2016 |
| 112 | Copper Ridge Resources LLC | Midland, TX 79710 | Oil Operator | Jul 2024 |
| 113 | Corona Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 114 | Couch Oil & Gas, Inc. | Dallas, TX 75229 | Oil & Gas Operator | Mar 2025 |
| 115 | Couch, Gilbert | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 116 | Cox, H. L. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jan 2011 |
| 117 | Crimson Energy Company, LC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2004 |
| 118 | Crossbow Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 119 | Crosstex Services, L.L.C. | Tuscola, TX 79562 | Oil Operator | Mar 2025 |
| 120 | CRT'S, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Aug 2008 |
| 121 | Crude Production Company | Clyde, TX 79510 | Oil & Gas Operator | Mar 2025 |
| 122 | Cuatro Oil And Gas Corporation | Abilene, TX 79603 | Oil & Gas Operator | Mar 2025 |
| 123 | Cumberland Petroleum, Inc. II | Weatherford, TX 76086 | Oil & Gas Operator | May 1997 |
| 124 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2025 |
| 125 | D & R Enterprises | Eastland, TX 76448 | Oil & Gas Operator | Oct 2020 |
| 126 | D-Bar Leasing, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2022 |
| 127 | D-T Development Company | Richardson, TX 75081 | Oil & Gas Operator | Sep 2002 |
| 128 | D. & D. Operating Account | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2009 |
| 129 | D. A. B. Oil Service, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Nov 2012 |
| 130 | D. G. Oil Co. | Dennis, TX 76439 | Oil & Gas Operator | Mar 2025 |
| 131 | D.J. & T. Energy | Abilene, TX 79601 | Oil & Gas Operator | Mar 2025 |
| 132 | D.J.F. Services, Inc. | Holdenville, OK 74848 | Oil & Gas Operator | Mar 2025 |
| 133 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 134 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 135 | Davis Enterprises | Abilene, TX 79608 | Oil & Gas Operator | Aug 1998 |
| 136 | DBC Operating Company LLC | Midlothian, TX 76065 | Oil & Gas Operator | Mar 2025 |
| 137 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 138 | Del Mar Energy, Inc. | Van Alstyne, TX 75495 | Oil & Gas Operator | Mar 2025 |
| 139 | Delta Oil & Gas Company | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2003 |
| 140 | Delta Oil & Gas LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 141 | Demand Energy, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Jul 1999 |
| 142 | Denteco Oil Company LLC | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 143 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Mar 2025 |
| 144 | DFG Energy Company LLC | Richardson, TX 75081 | Oil & Gas Operator | Mar 2025 |
| 145 | Diamond S Masada LLC | Magnolia, TX 77354 | Oil & Gas Operator | Mar 2025 |
| 146 | Dino Operating LLC | Throckmorton, TX 76483 | Oil Operator | Mar 2025 |
| 147 | DJ & T Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | Mar 2025 |
| 148 | Domino Operations, Inc. | Abilene, TX 79603 | Oil & Gas Operator | Mar 2025 |
| 149 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Mar 2025 |
| 150 | Dowell Oil & Gas | Stephenville, TX 76401 | Oil & Gas Operator | Mar 2025 |
| 151 | DP2, LLC | Southlake, TX 76092 | Oil & Gas Operator | Mar 2025 |
| 152 | Dragoon Oil & Gas Co. | Fort Worth, TX 76147 | Oil & Gas Operator | May 2015 |
| 153 | Drillogix Exploration LLC | Breckenridge, TX 76424 | Oil Operator | Mar 2025 |
| 154 | Duncan Drilling Co. | Big Spring, TX 79721 | Oil & Gas Operator | Mar 2025 |
| 155 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Mar 2025 |
| 156 | E.C. Hindman Oil And Gas | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 157 | Eastco Gas Co. | Midland, TX 79707 | Oil & Gas Operator | Oct 1999 |
| 158 | Eastland Exploration, Inc. | Austin, TX 78763 | Oil & Gas Operator | Apr 1997 |
| 159 | Eastland Oil Company, The | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 160 | Eastland Operating, L.L.C. | Ranger, TX 76470 | Oil & Gas Operator | Mar 2025 |
| 161 | Eclipse Oil & Gas, Inc. | Midland, TX 79703 | Oil & Gas Operator | Mar 2025 |
| 162 | Eddie'S Royalties, Inc. | Rising Star, TX 76471 | Oil & Gas Operator | Mar 2025 |
| 163 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 164 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Dec 2024 |
| 165 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 166 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 167 | Enre LP | Kingwood, TX 77339 | Oil & Gas Operator | Feb 2004 |
| 168 | Enrich Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 169 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 170 | Enstar Energy, Inc. | Arlington, TX 76003 | Oil & Gas Operator | Mar 2025 |
| 171 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 172 | Ericksen, W.R. | Hobbs, NM 88240 | Oil & Gas Operator | Nov 1993 |
| 173 | Erin Oil Exploration, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 1996 |
| 174 | Escondido Operating, Inc. | Carrollton, TX 75011 | Oil & Gas Operator | Jun 2013 |
| 175 | Esg Resources LLC | Dallas, TX 75231 | Oil & Gas Operator | Mar 2025 |
| 176 | Estacado Energy, LLC | Iowa Park, TX 76367 | Oil & Gas Operator | Mar 2025 |
| 177 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 178 | Eubank, Robert B. & B. K. | Spring, TX 77388 | Oil & Gas Operator | Mar 2008 |
| 179 | European-Southwest Co. | Houston, TX 77254 | Oil & Gas Operator | Mar 2025 |
| 180 | Evarado Oil Company | Strawn, TX 76475 | Oil & Gas Operator | Mar 2025 |
| 181 | Evarado Oil, LLC | Strawn, TX 76475 | Oil & Gas Operator | Mar 2025 |
| 182 | Everest Network LLC | Eastland, TX 76448 | Oil & Gas Operator | Mar 2025 |
| 183 | Excel Energy, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Mar 2025 |
| 184 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Dec 2024 |
| 185 | Exp, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 2003 |
| 186 | Expanding Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 187 | Falcon Gas Storage Co., Inc. | Houston, TX 77057 | Oil & Gas Operator | Feb 2007 |
| 188 | Falcon Minerals, LTD. | Houston, TX 77057 | Oil & Gas Operator | May 2010 |
| 189 | Felderhoff Production Company | Muenster, TX 76252 | Oil & Gas Operator | Mar 2025 |
| 190 | Field Production Company | Cleburne, TX 76033 | Oil & Gas Operator | Mar 2023 |
| 191 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 192 | Firerock Company | Abilene, TX 79602 | Oil & Gas Operator | Mar 2025 |
| 193 | First American Operating Co. | Breckenridge, TX 76424 | Oil & Gas Operator | Aug 2006 |
| 194 | Fisher, Jack Inc. | Abilene, TX 79603 | Oil & Gas Operator | Sep 2001 |
| 195 | Flag Energy, LLC | Centerton, AR 72719 | Oil & Gas Operator | Nov 2018 |
| 196 | Flare Oil Inc | Rockport, TX 78382 | Oil & Gas Operator | Mar 2025 |
| 197 | Foag, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2022 |
| 198 | Fossil Operating, Inc. | Dallas, TX 75238 | Oil & Gas Operator | Mar 2025 |
| 199 | Foster, Randy | New Braunfels, TX 78132 | Oil & Gas Operator | Feb 2021 |
| 200 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Mar 2025 |