| 201 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 202 | Cotton Valley Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2000 |
| 203 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 204 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 205 | Crestridge DRLG. & Prod.Co.,LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2023 |
| 206 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 207 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2023 |
| 208 | Crosstex Services, L.L.C. | Tuscola, TX 79562 | Oil Operator | Apr 2024 |
| 209 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Apr 2024 |
| 210 | Crusader Energy II LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 211 | CTL Oil & Gas Corporation | Buchanan Dam, TX 78609 | Oil & Gas Operator | Nov 2020 |
| 212 | Cuervo, Inc. | FT Stockton, TX 79735 | Oil & Gas Operator | Apr 2024 |
| 213 | Custer & Wright Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 214 | Cwoc | Big Spring, TX 79721 | Oil & Gas Operator | Apr 2024 |
| 215 | D & B Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 216 | Dakota Resources, Inc. (I) | Midland, TX 79707 | Oil & Gas Operator | Apr 2024 |
| 217 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 218 | Davcro Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Dec 2003 |
| 219 | Day Resources, Inc. | Midland, TX 79707 | Oil & Gas Operator | Aug 1994 |
| 220 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Jan 2024 |
| 221 | De IV Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2024 |
| 222 | De3 Operating LLC | Irving, TX 75038 | Oil & Gas Operator | Jun 2021 |
| 223 | Dean Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2019 |
| 224 | Desana Development Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 225 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 226 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2024 |
| 227 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 228 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 229 | DHC, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 1997 |
| 230 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | Apr 2024 |
| 231 | Diamondback E&P LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 232 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 233 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | Apr 2024 |
| 234 | DJ & T Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | Apr 2024 |
| 235 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 236 | Dominion Operating, LLC | Midland, TX 79708 | Oil Operator | Mar 2018 |
| 237 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Dec 2014 |
| 238 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Apr 2024 |
| 239 | Draco Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 240 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 241 | Drilmor, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 1998 |
| 242 | Duncan Drilling Co. | Big Spring, TX 79721 | Oil & Gas Operator | Apr 2024 |
| 243 | Dune Oil And Gas, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Aug 2006 |
| 244 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 245 | Dyad Petroleum Company | Midland, TX 79710 | Oil & Gas Operator | Sep 2021 |
| 246 | E.G.L. Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2024 |
| 247 | Eagle Rock Operating Company,LLC | Houston, TX 77252 | Oil & Gas Operator | Oct 2015 |
| 248 | Earnest Producing Corporation | Midland, TX 79704 | Oil & Gas Operator | Apr 2024 |
| 249 | Eastland Oil Company, The | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 250 | Eclipse Oil & Gas, Inc. | Midland, TX 79703 | Oil & Gas Operator | Apr 2024 |
| 251 | Eclipse Services, Inc. * | La Grange, TX 78945 | Oil & Gas Operator | Jul 2003 |
| 252 | Ecoserv Environmental SVCS, LLC | Abbeville, LA 70510 | Oil Operator | Apr 2024 |
| 253 | El Ran, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Apr 2024 |
| 254 | Eldorado Oil And Gas, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Nov 1995 |
| 255 | Element Petroleum Op III, LLC | Midland, TX 79710 | Oil & Gas Operator | Apr 2024 |
| 256 | Elevation Resources LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 257 | Elk Meadows Resources LLC | Houston, TX 77037 | Oil & Gas Operator | Jan 2021 |
| 258 | Elk River Resources, LLC | The Woodlands, TX 77382 | Oil & Gas Operator | Oct 2023 |
| 259 | Empire Texas Operating LLC | Tulsa, OK 74114 | Oil & Gas Operator | Apr 2024 |
| 260 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 261 | Encore Energy Partners Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2015 |
| 262 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Feb 2024 |
| 263 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 264 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 265 | Energy Onramp LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 266 | Energy Production Corporation | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 267 | Energy Resources Oil & Gas Corp. | Amarillo, TX 79102 | Oil & Gas Operator | Jun 1994 |
| 268 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jan 2024 |
| 269 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2024 |
| 270 | Enerstar Resources, L.C. | Midland, TX 79701 | Oil & Gas Operator | Apr 1999 |
| 271 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 272 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 273 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 274 | Enterprise Crude Oil LLC | Oklahoma City, OK 73102 | Oil Operator | Aug 2011 |
| 275 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 276 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 277 | Ernmar Investments, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Apr 2024 |
| 278 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 279 | Etc Texas Pipeline, LTD. | San Antonio, TX 78258 | Oil Operator | Sep 2023 |
| 280 | Etl Hydrocarbons, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Apr 2024 |
| 281 | Eureka Prospecting Company | Wimberley, TX 78676 | Oil & Gas Operator | Jun 2023 |
| 282 | Ewt Operating Company | Andrews, TX 79714 | Oil & Gas Operator | Apr 2024 |
| 283 | Exchange Exploration & Production Co. | Dallas, TX 75219 | Oil & Gas Operator | Jan 2024 |
| 284 | Exl Petroleum, LP | Midland, TX 79705 | Oil & Gas Operator | Jun 2017 |
| 285 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Apr 2024 |
| 286 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 287 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2023 |
| 288 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Apr 2024 |
| 289 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2024 |
| 290 | F & M Oil & Gas Co | Midland, TX 79702 | Oil & Gas Operator | Feb 2000 |
| 291 | Fagadau Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2006 |
| 292 | Famcor Oil, Inc. | Scottsdale, AZ 85260 | Oil & Gas Operator | Sep 2020 |
| 293 | Fasken Oil And Ranch, LTD. | Midland, TX 79707 | Oil & Gas Operator | Apr 2024 |
| 294 | Fasken, Barbara | Midland, TX 79701 | Oil & Gas Operator | Dec 1995 |
| 295 | FDL Operating, LLC | Judson, TX 75660 | Oil & Gas Operator | Apr 2024 |
| 296 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 297 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Apr 2024 |
| 298 | Fivestones Energy LLC | Midland, TX 79710 | Oil & Gas Operator | Apr 2024 |
| 299 | Flint Oak Energy, LLC | Montgomery, TX 77356 | Oil & Gas Operator | Apr 2024 |
| 300 | Floyd Operating Company | Houston, TX 77002 | Oil & Gas Operator | Jul 2004 |