| 101 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 102 | Clide Oil Corp. | Iraan, TX 79744 | Oil & Gas Operator | Nov 2015 |
| 103 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 104 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | May 2025 |
| 105 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 106 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 107 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 108 | Collins & Ware, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 109 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 110 | Concho Resources Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2004 |
| 111 | Cone & Petree Oil & Gas Exp. Inc | Lubbock, TX 79453 | Oil & Gas Operator | May 2024 |
| 112 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 113 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 114 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 115 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | May 2025 |
| 116 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 117 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 118 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 119 | Cove Petroleum Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2020 |
| 120 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 121 | Crockett Operating, LLC | Arlington, TX 76017 | Oil & Gas Operator | May 2025 |
| 122 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 123 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |
| 124 | Crosstex Services, L.L.C. | Tuscola, TX 79562 | Oil Operator | May 2025 |
| 125 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 126 | Crystal River Oil & Gas LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jan 2023 |
| 127 | Cuervo Resources, Inc. | FT Stockton, TX 79735 | Oil & Gas Operator | Oct 1996 |
| 128 | Cuervo, Inc. | FT Stockton, TX 79735 | Oil & Gas Operator | May 2025 |
| 129 | Custer & Wright Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 130 | Dakota Resources, Inc. (I) | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 131 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 132 | Davis Asset Management, Inc. | Houston, TX 77010 | Oil & Gas Operator | Dec 2004 |
| 133 | Davis Southern Operating Co LLC | Houston, TX 77004 | Oil & Gas Operator | May 2025 |
| 134 | Delta C02, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2021 |
| 135 | Delta Oil & Gas Company | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2003 |
| 136 | Desana Development Corporation | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 137 | Desert Production, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 138 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 139 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 140 | Diamondback E&P LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 141 | Dickson Petroleum, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2000 |
| 142 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 143 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Oct 2013 |
| 144 | Double Barrel Oil LLC | Brenham, TX 77834 | Oil & Gas Operator | May 2025 |
| 145 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 146 | E R Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 147 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 148 | Eastland Oil Company, The | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 149 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 150 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 151 | El Ran, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | May 2025 |
| 152 | Elam, Jack G. | Midland, TX 79702 | Oil & Gas Operator | Dec 2002 |
| 153 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 154 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 155 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 156 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Mar 2025 |
| 157 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 158 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | May 2025 |
| 159 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 160 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 161 | Enserch Oil & Gas, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 1998 |
| 162 | Enwest Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | Aug 1994 |
| 163 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 164 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 165 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | May 2025 |
| 166 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 167 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 168 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 169 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Feb 2025 |
| 170 | Falcon Creek Resources, Inc. | Tulsa, OK 74137 | Oil & Gas Operator | Apr 2001 |
| 171 | Famcor Oil, Inc. | Scottsdale, AZ 85260 | Oil & Gas Operator | Sep 2020 |
| 172 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Apr 2025 |
| 173 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 174 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | May 2025 |
| 175 | First Permian, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 176 | Fivestones Energy LLC | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 177 | Flat Top Operating, LLC | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 178 | Floyd Operating Company | Houston, TX 77002 | Oil & Gas Operator | Jul 2004 |
| 179 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 180 | Founders Oil & Gas Operating,LLC | Arlington, TX 76011 | Oil & Gas Operator | Jul 2023 |
| 181 | Four C Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2024 |
| 182 | Four Star Oil & Gas Company | Houston, TX 77252 | Oil & Gas Operator | Feb 2025 |
| 183 | Fueled Resources Inc | Boyd, TX 76023 | Oil & Gas Operator | May 2025 |
| 184 | Fuller Petroleum Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 185 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 186 | Gap Exploration, LTD. | Naples, FL 34110 | Oil & Gas Operator | Jul 2008 |
| 187 | Gecko | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 188 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 189 | Goldston Oil Corporation | Houston, TX 77257 | Oil & Gas Operator | May 2025 |
| 190 | Grace Petroleum Operating, LLC | Llano, TX 78643 | Oil & Gas Operator | May 2025 |
| 191 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 192 | Grand Banks Energy Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 193 | Great Texas Crude Inc. | Fredericksbrg, TX 78624 | Oil & Gas Operator | May 2025 |
| 194 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 195 | Great Western Onshore Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 196 | Greenhill Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Jan 1998 |
| 197 | Grizzly Op Of Delaware, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2021 |
| 198 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 199 | GTG Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | May 2025 |
| 200 | H & K Oil Company | Kilgore, TX 75662 | Oil & Gas Operator | Nov 1998 |