| 201 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |
| 202 | Eastland Exploration, Inc. | Austin, TX 78763 | Oil & Gas Operator | Apr 1997 |
| 203 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 204 | Edwards-Foster, Inc. | Midland, TX 79708 | Oil & Gas Operator | Aug 1996 |
| 205 | El Reno Energy, LLC | Granbury, TX 76048 | Oil & Gas Operator | May 2025 |
| 206 | Element Petroleum Op III, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 207 | Elk Energy Corporation | Denver, CO 80218 | Oil & Gas Operator | Mar 2008 |
| 208 | Elk Meadows Resources LLC | Houston, TX 77037 | Oil & Gas Operator | Jan 2021 |
| 209 | Encore Energy Partners Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2015 |
| 210 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 211 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 212 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 213 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 214 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Mar 2025 |
| 215 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 216 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2025 |
| 217 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2025 |
| 218 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 219 | Enr Operating, LLC | Eunice, NM 88231 | Oil & Gas Operator | May 2025 |
| 220 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 221 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 222 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 223 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 224 | Ernmar Investments, Inc. | Edmond, OK 73083 | Oil & Gas Operator | May 2025 |
| 225 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 226 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 227 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 228 | Etl Hydrocarbons, Inc. | Andrews, TX 79714 | Oil & Gas Operator | May 2025 |
| 229 | Evinger, Ernest E. | Midland, TX 79705 | Oil & Gas Operator | Mar 2002 |
| 230 | Ewt Operating Company | Andrews, TX 79714 | Oil & Gas Operator | May 2025 |
| 231 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 232 | Exxon Corp. - Midland | Houston, TX 77210 | Gas Operator | Jul 1997 |
| 233 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 234 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 235 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Feb 2025 |
| 236 | F & M Oil & Gas Co | Midland, TX 79702 | Oil & Gas Operator | Feb 2000 |
| 237 | Fagadau Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2006 |
| 238 | Falcon Creek Resources, Inc. | Tulsa, OK 74137 | Oil & Gas Operator | Apr 2001 |
| 239 | Famcor Oil, Inc. | Scottsdale, AZ 85260 | Oil & Gas Operator | Sep 2020 |
| 240 | Fasken Oil And Ranch, LTD. | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 241 | Fasken, Barbara | Midland, TX 79701 | Oil & Gas Operator | Dec 1995 |
| 242 | FDL Operating, LLC | Judson, TX 75660 | Oil & Gas Operator | May 2025 |
| 243 | Federal Oil, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | May 2025 |
| 244 | Felderhoff Production Company | Muenster, TX 76252 | Oil & Gas Operator | May 2025 |
| 245 | Fiml Natural Resources, LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2014 |
| 246 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 247 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | May 2025 |
| 248 | First Permian, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 249 | Flat Top Operating, LLC | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 250 | Flint Oak Energy, LLC | Montgomery, TX 77356 | Oil & Gas Operator | May 2025 |
| 251 | Floyd Oil Company | Houston, TX 77002 | Oil & Gas Operator | Nov 1999 |
| 252 | Floyd Operating Company | Houston, TX 77002 | Oil & Gas Operator | Jul 2004 |
| 253 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 254 | Forest Oil Permian Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 255 | Forge Energy, LLC | San Antonio, TX 78249 | Oil & Gas Operator | Apr 2019 |
| 256 | Fortson Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2020 |
| 257 | Fortuna Resources Dvlpment, LLC | Houston, TX 77055 | Oil & Gas Operator | May 2025 |
| 258 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | May 2025 |
| 259 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 260 | Free Rein Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | May 2025 |
| 261 | Gap Exploration, LTD. | Naples, FL 34110 | Oil & Gas Operator | Jul 2008 |
| 262 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 263 | Geomark Resources, L.L.C. | Lubbock, TX 79453 | Oil & Gas Operator | May 2025 |
| 264 | Giant NRG Co., LP | Dallas, TX 75230 | Oil & Gas Operator | May 2025 |
| 265 | Giebel Petroleum LTD. | Midland, TX 79705 | Oil & Gas Operator | Jul 2019 |
| 266 | Gilliam'S Aghorn Energy | Odessa, TX 79768 | Oil & Gas Operator | May 1997 |
| 267 | Goodnight Midstream Permian, LLC | Dallas, TX 75206 | Oil & Gas Operator | May 2025 |
| 268 | Goodrich Pet. Co. Of Louisiana | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 269 | Goodrich Petroleum Co. II, LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2002 |
| 270 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 271 | Grace Petroleum Operating, LLC | Llano, TX 78643 | Oil & Gas Operator | May 2025 |
| 272 | Grace Petroleum, L.P. | Midland, TX 79708 | Oil & Gas Operator | May 2016 |
| 273 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 274 | Graham, Bill J. Oil & Gas Corp. | Midland, TX 79710 | Oil & Gas Operator | Nov 2000 |
| 275 | Grand Banks Energy Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 276 | Grand Gulf Production, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Dec 1997 |
| 277 | Great Texas Crude Inc. | Fredericksbrg, TX 78624 | Oil & Gas Operator | May 2025 |
| 278 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 279 | Griffin Petroleum Company | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 280 | Grizzly Op Of Delaware, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2021 |
| 281 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 282 | Gungoll, Carl E. Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 283 | H & O Operating Co | Odessa, TX 79764 | Oil & Gas Operator | Mar 2008 |
| 284 | H & S Drilling Co Inc | Frazeysburg, OH 43822-0040-0040 | Oil & Gas Operator | Dec 2016 |
| 285 | H&G Petroleum Corporation | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 286 | Hadson Energy Resources Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 1994 |
| 287 | Hallwood Energy Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2005 |
| 288 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2025 |
| 289 | Halvey Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 290 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | May 2025 |
| 291 | Hannathon Petroleum, LLC | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 292 | Hanson Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 293 | Harrison Interests, LTD. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 294 | Hat Oil & Gas, Inc. | Slaton, TX 79364 | Oil & Gas Operator | Feb 2002 |
| 295 | HCM | Dallas, TX 75206 | Oil & Gas Operator | Mar 2015 |
| 296 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 297 | Henderson & Erickson, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 298 | Hendrix, John H. Corporation | Midland, TX 79705 | Oil & Gas Operator | Sep 2018 |
| 299 | Henry Petroleum Corp. | Midland, TX 79703 | Oil & Gas Operator | Mar 2001 |
| 300 | Henry Petroleum LP | Midland, TX 79701 | Oil & Gas Operator | Dec 2008 |