| 101 | Coalinga Corporation | Houston, TX 77002 | Oil & Gas Operator | May 1999 |
| 102 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 103 | Cockrell Production Co., Inc. | Irving, TX 75014 | Oil & Gas Operator | Mar 2025 |
| 104 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 105 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 106 | Colemanite, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Mar 2025 |
| 107 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 108 | Comstock Energy, LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2025 |
| 109 | Condor Operating Co. | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 110 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 111 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 112 | Continual Oil & Gas, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Mar 2025 |
| 113 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 114 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 115 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 116 | Coyote Services, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Mar 2002 |
| 117 | Crego Exploration | Dallas, TX 75243 | Oil & Gas Operator | Mar 2025 |
| 118 | Creston Petroleum Corp. | Dallas, TX 75380 | Oil & Gas Operator | Mar 2025 |
| 119 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2024 |
| 120 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Dec 2024 |
| 121 | Crown Petroleum Corp. | Oklahoma City, OK 73106 | Oil & Gas Operator | Mar 2025 |
| 122 | Crystal River Oil & Gas LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jan 2023 |
| 123 | Cuatro Oil And Gas Corporation | Abilene, TX 79603 | Oil & Gas Operator | Mar 2025 |
| 124 | Cucharas Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Dec 2000 |
| 125 | Culebra Oil & Gas, LLC | Kerrville, TX 78028 | Oil & Gas Operator | Mar 2025 |
| 126 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |
| 127 | D & B Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 128 | D.J.F. Services, Inc. | Holdenville, OK 74848 | Oil & Gas Operator | Mar 2025 |
| 129 | D.K.D. | Merkel, TX 79536 | Oil & Gas Operator | Mar 2025 |
| 130 | Dakota Resources, Inc. (I) | Midland, TX 79707 | Oil & Gas Operator | Mar 2025 |
| 131 | Dale Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 132 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 133 | Dallas Petroleum Group, LLC | Dallas, TX 75379 | Oil & Gas Operator | Mar 2025 |
| 134 | Day Resources, Inc. | Midland, TX 79707 | Oil & Gas Operator | Aug 1994 |
| 135 | Del Petroleum Corporation | Dallas, TX 75219 | Oil & Gas Operator | Jan 2012 |
| 136 | Delray Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 137 | Delta Oil & Gas Company | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2003 |
| 138 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Mar 2025 |
| 139 | Desana Development Corporation | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 140 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 141 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 142 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Dec 2014 |
| 143 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Mar 2025 |
| 144 | Double M Petroproperties, Inc. | Haskell, TX 79521 | Oil & Gas Operator | Mar 2025 |
| 145 | Draco Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 146 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 147 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 148 | Duncan Drilling Co. | Big Spring, TX 79721 | Oil & Gas Operator | Mar 2025 |
| 149 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 150 | Dyad Petroleum Company | Midland, TX 79710 | Oil & Gas Operator | Sep 2021 |
| 151 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Mar 2025 |
| 152 | Eastern Energy Corporation | Bowling Green, KY 42104 | Oil & Gas Operator | Dec 2013 |
| 153 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 154 | Eclipse Oil & Gas, Inc. | Midland, TX 79703 | Oil & Gas Operator | Mar 2025 |
| 155 | El Ran, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2025 |
| 156 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jan 2025 |
| 157 | Ellison, Dewitt, Jr. | Aspermont, TX 79502 | Oil & Gas Operator | Mar 2016 |
| 158 | Energy Resource & Develop., Corp | Rockwall, TX 75087 | Oil & Gas Operator | Jun 1998 |
| 159 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Dec 2024 |
| 160 | Enrich Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 161 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 162 | Erwin, James D. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1993 |
| 163 | Escoba Royalty Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Nov 2005 |
| 164 | Estate Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2011 |
| 165 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 166 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 167 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 168 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Dec 2024 |
| 169 | Exp, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 2003 |
| 170 | Extech Operating, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | Mar 2025 |
| 171 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 172 | Fagadau Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2006 |
| 173 | Falcon Creek Resources, Inc. | Tulsa, OK 74137 | Oil & Gas Operator | Apr 2001 |
| 174 | Falcon Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2021 |
| 175 | Feagan Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 176 | Federal Energy Development Co. | Dallas, TX 75205 | Oil & Gas Operator | Mar 2011 |
| 177 | Federal Oil, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Mar 2025 |
| 178 | Fisher, Jack Inc. | Abilene, TX 79603 | Oil & Gas Operator | Sep 2001 |
| 179 | Flying W Resources, LLC | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 180 | Forcenergy Gas Exploration Inc. | Miami, FL 33129 | Oil & Gas Operator | Aug 1996 |
| 181 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 182 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 183 | Fortson Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2020 |
| 184 | Fossil Fuels Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2000 |
| 185 | Fossil Operating, Inc. | Dallas, TX 75238 | Oil & Gas Operator | Mar 2025 |
| 186 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Mar 2025 |
| 187 | Four Star Oil & Gas Company | Houston, TX 77252 | Oil & Gas Operator | Nov 2024 |
| 188 | G & F Oil, Inc. | Aledo, TX 76008 | Oil & Gas Operator | Mar 2025 |
| 189 | Gaea Services, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2021 |
| 190 | GBG Operating Corp. | Wichita Falls, TX 76302 | Oil & Gas Operator | Sep 1998 |
| 191 | Gilmore Oil & Gas | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 192 | Ginnings Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2025 |
| 193 | Golden Resources Corporation | Dallas, TX 75238 | Oil & Gas Operator | Dec 1998 |
| 194 | Goodrock Natural Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2025 |
| 195 | Gore Oil Company | Wichita, KS 67202 | Oil & Gas Operator | Nov 2024 |
| 196 | Gore, G.E. | Plano, TX 75074 | Oil & Gas Operator | Aug 2003 |
| 197 | Grace 7 Properties, LTD. | Argyle, TX 76226 | Oil & Gas Operator | Mar 2025 |
| 198 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 199 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 200 | Grand Banks Energy Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |