| 101 | CDJ Oil Co. | Albany, TX 76430 | Oil & Gas Operator | Apr 2025 |
| 102 | Cedar Oil Company | Midland, TX 79707 | Oil & Gas Operator | Apr 2025 |
| 103 | Cedar Ridge Energy, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Apr 2025 |
| 104 | Centex Energy, LLC | Bryan, TX 77802 | Oil & Gas Operator | Apr 2025 |
| 105 | CH4 Energy II LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Apr 2018 |
| 106 | Chambers, R. H. | Abilene, TX 79606 | Oil & Gas Operator | Apr 2006 |
| 107 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 108 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2025 |
| 109 | Chase Operating Company | Abilene, TX 79608 | Oil & Gas Operator | Feb 2016 |
| 110 | Cheetah Investments, Inc. | Winters, TX 79567 | Oil & Gas Operator | Apr 2025 |
| 111 | Chi Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 112 | China Star Oil Co., LLC | Woodway, TX 76712 | Oil & Gas Operator | Jun 2010 |
| 113 | Chiodo Corp. | San Antonio, TX 78232 | Oil & Gas Operator | Apr 2025 |
| 114 | Chisholm Exploration | Abilene, TX 79604 | Oil & Gas Operator | Apr 2025 |
| 115 | Chisholm Operating, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Apr 2025 |
| 116 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Apr 2025 |
| 117 | Cinnabar Energy, LTD. | Fort Worth, TX 76107 | Oil & Gas Operator | May 2018 |
| 118 | Circle Ridge Production, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 119 | Clear Brooke Ranches, LLC | Fort Worth, TX 76179 | Oil & Gas Operator | Apr 2025 |
| 120 | Clear Fork, Incorporated | Abilene, TX 79604 | Oil & Gas Operator | Apr 2025 |
| 121 | CLS Interests, Incorporated | Austin, TX 78734 | Oil & Gas Operator | Jan 1997 |
| 122 | Co Energy | Benbrook, TX 76126 | Oil & Gas Operator | Apr 2025 |
| 123 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2025 |
| 124 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 125 | Colo Exploration Company, Inc. | Benbrook, TX 76126 | Oil & Gas Operator | Apr 2025 |
| 126 | Concho Oilfield Serv & Oper Co. | Eden, TX 76837 | Oil & Gas Operator | Apr 2025 |
| 127 | Cone & Petree Oil & Gas Exp. Inc | Lubbock, TX 79453 | Oil & Gas Operator | May 2024 |
| 128 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 129 | Conquistador Petroleum,Inc. | Coleman, TX 76834 | Oil & Gas Operator | Apr 2025 |
| 130 | Continual Oil & Gas, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Apr 2025 |
| 131 | Contour Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Dec 2015 |
| 132 | Cooke, Kenny D. Operating | Ballinger, TX 76821 | Oil & Gas Operator | Mar 2004 |
| 133 | Corkran Energy, LP | Ignacio, CO 81137 | Oil & Gas Operator | May 2013 |
| 134 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 135 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 136 | Cremson Oil & Gas | Coleman, TX 76834 | Oil & Gas Operator | Apr 2025 |
| 137 | Crimson Energy Company, LC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2004 |
| 138 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2024 |
| 139 | CRT'S, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Aug 2008 |
| 140 | Crude Resources, Inc. | Carrollton, TX 75011 | Oil & Gas Operator | Mar 2008 |
| 141 | Cuatro Oil And Gas Corporation | Abilene, TX 79603 | Oil & Gas Operator | Apr 2025 |
| 142 | Cuatro Petro Corp. | Richardson, TX 75080 | Oil & Gas Operator | Apr 2025 |
| 143 | Cwic, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Apr 2025 |
| 144 | D&S Oil And Gas Properties | San Angelo, TX 76902 | Oil & Gas Operator | Apr 2025 |
| 145 | D. A. B. Oil Service, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Nov 2012 |
| 146 | D. W. R. Oil Co., Inc. | Merkel, TX 79536 | Oil & Gas Operator | Apr 2025 |
| 147 | D.J. & T. Energy | Abilene, TX 79601 | Oil & Gas Operator | Apr 2025 |
| 148 | D.K.D. | Merkel, TX 79536 | Oil & Gas Operator | Apr 2025 |
| 149 | D.T. Inc. | Abilene, TX 79608 | Oil & Gas Operator | Apr 2025 |
| 150 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 151 | Dakota Resources, Inc. (I) | Midland, TX 79707 | Oil & Gas Operator | Apr 2025 |
| 152 | Dallas Petroleum Group, LLC | Dallas, TX 75379 | Oil & Gas Operator | Apr 2025 |
| 153 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Apr 2025 |
| 154 | Dbo Oil Incorporated | Georgetown, TX 78628 | Oil & Gas Operator | Apr 2025 |
| 155 | Del Mar Energy, Inc. | Van Alstyne, TX 75495 | Oil & Gas Operator | Apr 2025 |
| 156 | Delray Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2025 |
| 157 | Deltex Minerals Inc. | Peachtree Cty, GA 30269 | Oil & Gas Operator | Apr 2025 |
| 158 | Dennis & Broun | Bullard, TX 75757 | Oil & Gas Operator | Sep 2003 |
| 159 | Dennis, Don | Grady, OK 73545 | Oil & Gas Operator | Mar 1998 |
| 160 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Apr 2025 |
| 161 | Desana Development Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 162 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 163 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | Apr 2025 |
| 164 | DK Oil Company | Winters, TX 79567 | Oil & Gas Operator | Jul 2022 |
| 165 | Dominion Corporation | Houston, TX 77001 | Oil & Gas Operator | Dec 2010 |
| 166 | Double M Petroproperties, Inc. | Haskell, TX 79521 | Oil & Gas Operator | Apr 2025 |
| 167 | Dove Drilling, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 1997 |
| 168 | Drennan Oil L.L.C. | Ballinger, TX 76821 | Oil & Gas Operator | Apr 2025 |
| 169 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2025 |
| 170 | DSTJ Corporation | Montgomery, TX 77316 | Oil & Gas Operator | Mar 2001 |
| 171 | Ducky Oil Corporation | Fort Worth, TX 76120 | Oil & Gas Operator | Apr 2025 |
| 172 | Dundee Petroleum, Inc. | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 2003 |
| 173 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Apr 2025 |
| 174 | E W D Oil | Winters, TX 79567 | Oil & Gas Operator | Apr 2025 |
| 175 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 176 | Eagle Production, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Apr 2025 |
| 177 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 178 | Edco Petroleum, Inc. | Dallas, TX 75202 | Oil & Gas Operator | Mar 2005 |
| 179 | Edgar, Verlon | Belle Chasse, LA 70037 | Oil & Gas Operator | Feb 1998 |
| 180 | Edinburgh Energy Partners, LLC | Midland, TX 79707 | Oil & Gas Operator | Apr 2025 |
| 181 | Edmondson Oil & Gas | Ballinger, TX 76821 | Oil & Gas Operator | Apr 2025 |
| 182 | Edwards, Gus Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2004 |
| 183 | Efficiency Operating Service | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2025 |
| 184 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Feb 2025 |
| 185 | Elco Oil & Gas | San Angelo, TX 76902 | Oil & Gas Operator | Dec 2014 |
| 186 | Elco Oil & Gas, Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Apr 2025 |
| 187 | Encon Services, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Apr 2025 |
| 188 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Jan 2025 |
| 189 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jan 2025 |
| 190 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 191 | Enr Operating, LLC | Eunice, NM 88231 | Oil & Gas Operator | Apr 2025 |
| 192 | Enrich Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 2025 |
| 193 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 194 | Eor Operating Company | Houston, TX 77079 | Oil & Gas Operator | Apr 2025 |
| 195 | Eratz Investments Inc. | Dallas, TX 75240 | Oil & Gas Operator | Apr 2025 |
| 196 | Erin Oil Exploration, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 1996 |
| 197 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 198 | Evangeline Trading Company | Ballinger, TX 76821 | Oil & Gas Operator | Apr 2025 |
| 199 | Exp, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 2003 |
| 200 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Apr 2025 |