| 201 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 202 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Oct 2013 |
| 203 | Dorland, D. L. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 204 | Dorland, D. L. Estate Of | Midland, TX 79702 | Oil & Gas Operator | Nov 1994 |
| 205 | Dorland, D. L. Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 1994 |
| 206 | Dos Cicadas | Miles, TX 76861 | Oil & Gas Operator | May 2025 |
| 207 | Double Barrel Oil LLC | Brenham, TX 77834 | Oil & Gas Operator | May 2025 |
| 208 | Double Eagle Operating, LLC | Fort Worth, TX 76113 | Oil & Gas Operator | May 2025 |
| 209 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | May 2025 |
| 210 | Dreher, George R. | Midland, TX 79702 | Oil & Gas Operator | Jan 2018 |
| 211 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 212 | Duncan Drilling Co. | Big Spring, TX 79721 | Oil & Gas Operator | May 2025 |
| 213 | Dune Oil And Gas, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Aug 2006 |
| 214 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 215 | Earnest Producing Corporation | Midland, TX 79704 | Oil & Gas Operator | May 2025 |
| 216 | Eclipse Oil & Gas, Inc. | Midland, TX 79703 | Oil & Gas Operator | May 2025 |
| 217 | Ecoserv Environmental SVCS, LLC | Abbeville, LA 70510 | Oil Operator | May 2025 |
| 218 | Edmar Company, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 219 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 220 | Eex Operating, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 221 | Element Petro Operating II, LLC | Midland, TX 79701 | Oil & Gas Operator | Sep 2016 |
| 222 | Element Petroleum Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2015 |
| 223 | Elk Energy Corporation | Denver, CO 80218 | Oil & Gas Operator | Mar 2008 |
| 224 | Elkhorn Oil & Gas, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 1995 |
| 225 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 226 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 227 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 228 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 229 | Energy Production Corporation | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 230 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 231 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 232 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 233 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 234 | Enserch Oil & Gas, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 1998 |
| 235 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 236 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 237 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 238 | Escondido Bay Corporation | Dallas, TX 75202 | Oil Operator | May 2025 |
| 239 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 240 | Excel Energy Co. | Coahoma, TX 79511 | Oil & Gas Operator | May 2025 |
| 241 | Exotic Oil & Gas LLC | Indiana, PA 15701-3634 | Oil & Gas Operator | Dec 2024 |
| 242 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 243 | Exxon Corp. - Midland | Houston, TX 77210 | Gas Operator | Jul 1997 |
| 244 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 245 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 246 | F & M Oil & Gas Co | Midland, TX 79702 | Oil & Gas Operator | Feb 2000 |
| 247 | Fagadau Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2006 |
| 248 | Fair Operating, Inc. | Boerne, TX 78015 | Oil & Gas Operator | May 2025 |
| 249 | Famcor Oil, Inc. | Scottsdale, AZ 85260 | Oil & Gas Operator | Sep 2020 |
| 250 | Farmers Of Tulsa Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Sep 1997 |
| 251 | Fasken Oil And Ranch, LTD. | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 252 | Fasken, Barbara | Midland, TX 79701 | Oil & Gas Operator | Dec 1995 |
| 253 | FDL Operating, LLC | Judson, TX 75660 | Oil & Gas Operator | May 2025 |
| 254 | Feagan Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 255 | Fed Operating LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 256 | Federal Oil, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | May 2025 |
| 257 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 258 | Finaly Resources LLC | Sunset Beach, CA 90742 | Oil & Gas Operator | May 2025 |
| 259 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | May 2025 |
| 260 | First Reserve Oil & Gas Co | Houston, TX 77002 | Oil & Gas Operator | Apr 2000 |
| 261 | Flat Top Operating, LLC | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 262 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 263 | Forest Oil Permian Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 264 | Forsan Oil Company | Forsan, TX 79733 | Oil & Gas Operator | Jul 2008 |
| 265 | Fortson Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2020 |
| 266 | Fortune Natural Resources Corp. | Houston, TX 77067 | Oil & Gas Operator | Dec 2003 |
| 267 | Fortune Production Co. | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2008 |
| 268 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | May 2025 |
| 269 | Free Rein Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | May 2025 |
| 270 | Fuller Production, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 271 | G & M Gas & Oil | Midland, TX 79701 | Oil & Gas Operator | Jun 1998 |
| 272 | Gallo Petroleum, LLC | Colorado City, TX 79512 | Oil Operator | May 2025 |
| 273 | Gap Exploration, LTD. | Naples, FL 34110 | Oil & Gas Operator | Jul 2008 |
| 274 | Gardner Energy Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 1999 |
| 275 | Garrett, Dorothy D. | Big Spring, TX 79720 | Oil & Gas Operator | Mar 1995 |
| 276 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 277 | Gideon Operating | Coleman, TX 76834 | Oil & Gas Operator | May 2025 |
| 278 | Gilmore Oil & Gas | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 279 | GNG Operating LLC | Graham, TX 76450 | Oil Operator | May 2025 |
| 280 | Golden Specialties Oil & Gas | Midland, TX 79708 | Oil & Gas Operator | May 2025 |
| 281 | Goodrich, John S. | Midland, TX 79705 | Oil & Gas Operator | Sep 1996 |
| 282 | Gouger Oil Co. | San Antonio, TX 78217 | Oil & Gas Operator | Nov 1995 |
| 283 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 284 | Graham, Bill J. Oil & Gas Corp. | Midland, TX 79710 | Oil & Gas Operator | Nov 2000 |
| 285 | Grayrock Energy II, LLC | Fort Worth, TX 76101 | Oil & Gas Operator | May 2025 |
| 286 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 287 | Grenadier Energy Partners II,LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2020 |
| 288 | Griffin Petroleum Company | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 289 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 290 | GTG Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | May 2025 |
| 291 | Guest R E Oil Producer | Edmond, OK 73083-0805 | Oil & Gas Operator | Mar 2015 |
| 292 | Guthrie, A. K. Operating Co. | Big Spring, TX 79720 | Oil & Gas Operator | Mar 1996 |
| 293 | Hadaway Consult And Engineer,LLC | Canadian, TX 79014 | Oil & Gas Operator | May 2025 |
| 294 | Haimo Oil & Gas LLC | Houston, TX 77042 | Oil & Gas Operator | Aug 2020 |
| 295 | Hall Oil & Gas | Coahoma, TX 79511 | Oil & Gas Operator | May 2025 |
| 296 | Hall Oil And Gas LLC | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 297 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2025 |
| 298 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 299 | Hankamer, Curtis Corporation,The | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 300 | Hannathon Petroleum, LLC | Midland, TX 79705 | Oil & Gas Operator | May 2025 |