| 201 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 202 | Driscoll S.W.D. Inc. | San Antonio, TX 78229 | Oil & Gas Operator | May 2025 |
| 203 | Dune Oil And Gas, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Aug 2006 |
| 204 | Dune Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 1997 |
| 205 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 206 | Dyad Petroleum Company | Midland, TX 79710 | Oil & Gas Operator | Sep 2021 |
| 207 | E R Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 208 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 209 | E.G.L. Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 210 | Eagle Energy Development Co | La Porte, TX 77571 | Oil & Gas Operator | Dec 2024 |
| 211 | Earthstone Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Mar 2025 |
| 212 | Eastland Oil Company, The | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 213 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 214 | Eggleston, Garaland | Big Lake, TX 76932 | Oil & Gas Operator | Aug 2003 |
| 215 | Egi, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | May 2025 |
| 216 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 217 | El Reno Energy, LLC | Granbury, TX 76048 | Oil & Gas Operator | May 2025 |
| 218 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Mar 2025 |
| 219 | Elevation Resources LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 220 | Elkhorn Oil & Gas, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 1995 |
| 221 | Ellison Lease Operating | Bridgeport, TX 76426 | Oil & Gas Operator | May 2025 |
| 222 | Ellsworth, H. P. O&G Properties | Corpus Chrsti, TX 78413 | Oil & Gas Operator | May 2025 |
| 223 | En Geo, Inc. | Richardson, TX 75081 | Oil & Gas Operator | May 2025 |
| 224 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 225 | Encore Energy Partners Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2015 |
| 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 | Enduring Resources, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2025 |
| 229 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 230 | Energy Production Corporation | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 231 | Energy Resources Oil & Gas Corp. | Amarillo, TX 79102 | Oil & Gas Operator | Jun 1994 |
| 232 | Energy Service Investment Corp. | Tulsa, OK 74137 | Oil & Gas Operator | May 2006 |
| 233 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 234 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | May 2025 |
| 235 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2025 |
| 236 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2025 |
| 237 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 238 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 239 | Enwest Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | Aug 1994 |
| 240 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 241 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 242 | Epic Permian Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Jan 2025 |
| 243 | Erwin, James D. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1993 |
| 244 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 245 | Eureka Gas Co, Inc | Pikeville, KY 41502 | Gas Operator | Dec 2010 |
| 246 | Exl Petroleum, LP | Midland, TX 79705 | Oil & Gas Operator | Jun 2017 |
| 247 | Exmoor Oil & Minerals Corp. | Dallas, TX 75225 | Oil & Gas Operator | May 1994 |
| 248 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 249 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 250 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 251 | Fabco | Big Lake, TX 76932 | Oil & Gas Operator | May 2025 |
| 252 | Fair Operating, Inc. | Boerne, TX 78015 | Oil & Gas Operator | May 2025 |
| 253 | Farmers Of Tulsa Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Sep 1997 |
| 254 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 255 | FDL Operating, LLC | Judson, TX 75660 | Oil & Gas Operator | May 2025 |
| 256 | Fenix Petroleum Group LLC | Washington, TX 77880 | Oil Operator | Jul 2019 |
| 257 | Fenway Energy Development Co. | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 258 | Fields Oil & Gas Company, LLC | Dallas, TX 75230 | Oil & Gas Operator | May 2025 |
| 259 | Fiml Natural Resources, LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2014 |
| 260 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 261 | Finaly Resources LLC | Sunset Beach, CA 90742 | Oil & Gas Operator | May 2025 |
| 262 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | May 2025 |
| 263 | First Permian, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 264 | Fisher Oil Co. | Big Lake, TX 76932 | Oil & Gas Operator | May 2025 |
| 265 | Five States Operating Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Mar 2025 |
| 266 | Flat Top Operating, LLC | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 267 | Flow Production Company | Midland, TX 79708 | Oil & Gas Operator | Mar 2005 |
| 268 | Forbes, C. C. Company | Alice, TX 78333 | Oil & Gas Operator | Sep 2015 |
| 269 | Foreland Operating, LLC | Royse City, TX 75189 | Oil & Gas Operator | Oct 2021 |
| 270 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 271 | Formentera Operations LLC | Austin, TX 78701 | Oil & Gas Operator | May 2025 |
| 272 | Fortune Production Co. | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2008 |
| 273 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | May 2025 |
| 274 | Four Starr Energy, Inc. | Dallas, TX 75243 | Gas Operator | May 2016 |
| 275 | Four Starr Production, LLC | Dallas, TX 75243 | Oil & Gas Operator | May 2025 |
| 276 | Fowler Oil & Gas LLC | Fort Worth, TX 76109 | Oil & Gas Operator | May 2025 |
| 277 | Franklin, J.W. Oil Operator | | Oil & Gas Operator | Nov 2001 |
| 278 | Free Rein Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | May 2025 |
| 279 | Freeman Energy Inc. (I) | Fredericksbrg, TX 78624 | Oil & Gas Operator | Aug 1996 |
| 280 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 281 | Geomark Resources, L.L.C. | Lubbock, TX 79453 | Oil & Gas Operator | May 2025 |
| 282 | Gibbs Drilling Co. | Iraan, TX 79744 | Oil & Gas Operator | Mar 2008 |
| 283 | Gilliam'S Aghorn Energy | Odessa, TX 79768 | Oil & Gas Operator | May 1997 |
| 284 | Gouger Oil Co. | San Antonio, TX 78217 | Oil & Gas Operator | Nov 1995 |
| 285 | GP Operating LLC | Roby, TX 79543 | Gas Operator | May 2025 |
| 286 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 287 | Graham, Bill J. Oil & Gas Corp. | Midland, TX 79710 | Oil & Gas Operator | Nov 2000 |
| 288 | Grasha, Matthew P. | Midland, TX 79709 | Oil & Gas Operator | Feb 1995 |
| 289 | GRB Properties, Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2003 |
| 290 | Great Northern Energy, Inc | Irving, TX 75039 | Oil & Gas Operator | May 2025 |
| 291 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 292 | Green Century Exp & Prod, LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 293 | Green, Roy W. Oil & Gas | San Angelo, TX 76902 | Oil & Gas Operator | Jun 2021 |
| 294 | Gresham Oil & Gas (USA) Inc. | Littleton, CO 80122 | Oil & Gas Operator | Jan 1999 |
| 295 | Grizzly Op Of Delaware, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2021 |
| 296 | Grover-McKinney Oil Company | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 297 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 298 | GTG Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | May 2025 |
| 299 | H&P Oil & Gas LLC | Mertzon, TX 76941 | Oil & Gas Operator | May 2025 |
| 300 | Halcon Resources Operating, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2013 |