| 301 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 302 | Ericksen, W.R. | Hobbs, NM 88240 | Oil & Gas Operator | Nov 1993 |
| 303 | Ernmar Investments, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Feb 2026 |
| 304 | Erwin Oil Company | Jacksboro, TX 76458 | Oil Operator | Feb 2026 |
| 305 | Erwin Operating | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 306 | Erwin, James D. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1993 |
| 307 | Esg Resources LLC | Dallas, TX 75231 | Oil & Gas Operator | Feb 2026 |
| 308 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | Feb 2026 |
| 309 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Nov 2025 |
| 310 | Exit Oil & Gas | Flower Mound, TX 75028 | Oil & Gas Operator | Feb 2026 |
| 311 | Exorare Energy, Inc. | Dallas, TX 75218 | Oil & Gas Operator | Feb 2026 |
| 312 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Feb 2026 |
| 313 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Feb 2026 |
| 314 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Feb 2026 |
| 315 | Extech Operating, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | Feb 2026 |
| 316 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 317 | F & R Oil Co. | Dallas, TX 75205 | Oil & Gas Operator | May 2005 |
| 318 | F B Operating, Inc. | Montague, TX 76251 | Oil & Gas Operator | Aug 2003 |
| 319 | Fagadau Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2006 |
| 320 | Fairway Resources Operating, LLC | Southlake, TX 76092 | Oil & Gas Operator | Aug 2022 |
| 321 | Faith Energy Exploration, Inc. | Ennis, TX 75119 | Oil & Gas Operator | Mar 2019 |
| 322 | Falcon Gas Storage Co., Inc. | Houston, TX 77057 | Oil & Gas Operator | Feb 2007 |
| 323 | Falcon Minerals, LTD. | Houston, TX 77057 | Oil & Gas Operator | May 2010 |
| 324 | Falcon Operating Company | Wichita Falls, TX 76302 | Gas Operator | Jan 2000 |
| 325 | Farmer Operating, LLC | Olney, TX 76374 | Oil & Gas Operator | Dec 2019 |
| 326 | Farmer, Lewis & Hayden | Olney, TX 76374 | Oil & Gas Operator | Oct 2008 |
| 327 | Farmers Of Tulsa Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Sep 1997 |
| 328 | Federal Energy Development Co. | Dallas, TX 75205 | Oil & Gas Operator | Mar 2011 |
| 329 | Felderhoff Production Company | Muenster, TX 76252 | Oil & Gas Operator | Feb 2026 |
| 330 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 331 | Fitts, B.K. Oil & Gas | Bowie, TX 76230 | Oil & Gas Operator | Feb 2026 |
| 332 | Five States Energy Company | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 333 | Five States Operating Company | Dallas, TX 75206 | Oil & Gas Operator | Feb 2008 |
| 334 | Five States Operating Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 335 | Flare Oil Inc | Rockport, TX 78382 | Oil & Gas Operator | Feb 2026 |
| 336 | Four H Oil Properties | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 337 | Four Sevens Oil Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2001 |
| 338 | Four Sevens Operating Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 339 | Fourway Oil Company | Longview, TX 75606 | Oil & Gas Operator | Feb 2026 |
| 340 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 341 | Fullspike Energy LLC | Boyd, TX 76023 | Oil & Gas Operator | Feb 2026 |
| 342 | Fultz Oil Company | Fort Worth, TX 76121 | Oil & Gas Operator | Dec 1995 |
| 343 | FX Energy Operating, LLC | Canadian, TX 79014 | Oil & Gas Operator | Feb 2026 |
| 344 | G & F Oil, Inc. | Aledo, TX 76008 | Oil & Gas Operator | Feb 2026 |
| 345 | G & L Royalty | Perrin, TX 76486 | Oil & Gas Operator | Feb 2026 |
| 346 | G. A. Hawkins Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 347 | G. S. Properties, Inc. | Arlington, TX 76013 | Oil & Gas Operator | May 1999 |
| 348 | Gardner Production, LLC | Decatur, TX 76234 | Oil & Gas Operator | Jul 2023 |
| 349 | GBF Operating LLC | Morrison, CO 80465 | Oil & Gas Operator | Feb 2026 |
| 350 | Geer Production Company | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2026 |
| 351 | General Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 352 | Georgetown Operating Company | Oklahoma City, OK 73113 | Oil & Gas Operator | Jun 2019 |
| 353 | Geurin Oil & Gas | Saint Jo, TX 76265 | Oil & Gas Operator | Oct 2022 |
| 354 | Giant Energy Corp. | Dallas, TX 75230 | Oil & Gas Operator | Jul 2019 |
| 355 | Giant NRG Co., LP | Dallas, TX 75230 | Oil & Gas Operator | Feb 2026 |
| 356 | Gilliam, Frank | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 357 | Gilmore, Leo Oil, Inc. | Holliday, TX 76366 | Oil & Gas Operator | Feb 2026 |
| 358 | Ginnings Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2025 |
| 359 | Glass, Theodore G. | Dallas, TX 75248 | Oil & Gas Operator | Feb 2026 |
| 360 | Glen D. Gonzenbach, LLC | Henrietta, TX 76365 | Oil & Gas Operator | Dec 2016 |
| 361 | Global Drilling, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 362 | Go Oil Corp. | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2026 |
| 363 | Golden Gas Production Company | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2025 |
| 364 | Golden Resources Corporation | Dallas, TX 75238 | Oil & Gas Operator | Dec 1998 |
| 365 | Gonzenbach Oil & Gas, LLC | Henrietta, TX 76365 | Oil & Gas Operator | May 2020 |
| 366 | Gonzenbach, Glen D | Henrietta, TX 76365 | Oil & Gas Operator | Aug 2007 |
| 367 | Goopco, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 368 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 369 | Grace, Jack Production Co, LLC | Wichita Falls, TX 76310 | Oil & Gas Operator | Feb 2026 |
| 370 | Grace, Jack, Prod. Co. | Wichita Falls, TX 76302 | Oil & Gas Operator | Mar 1997 |
| 371 | Grace, Pete | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 1996 |
| 372 | Gramrich Oil & Gas Corporation | Coppell, TX 75019 | Oil & Gas Operator | Oct 2012 |
| 373 | Grand Energy, Inc. | Dallas, TX 75248 | Oil & Gas Operator | Oct 2002 |
| 374 | Grand Operating, Inc. | Addison, TX 75001 | Oil & Gas Operator | Nov 2025 |
| 375 | Great American Resources Inc. | Bowie, TX 76230 | Oil & Gas Operator | Feb 2026 |
| 376 | Great West Operating Co., Inc. | Dallas, TX 75240 | Oil & Gas Operator | Aug 2003 |
| 377 | Greco Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 378 | Greco Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 379 | Greenville Operating Company | Dallas, TX 75206 | Oil & Gas Operator | Oct 1996 |
| 380 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 381 | Gulf States Petro. Corp. | Dallas, TX 75202 | Oil & Gas Operator | Apr 2006 |
| 382 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 383 | H P S Investments | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 384 | Hacker Brothers Oil Company, Inc | Muenster, TX 76252 | Oil & Gas Operator | May 2004 |
| 385 | Haigood & Campbell | Archer City, TX 76351 | Oil & Gas Operator | Feb 2026 |
| 386 | Halek Energy L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Jan 2014 |
| 387 | Hamilton, W. B., Estate | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2004 |
| 388 | Hamilton-Tedford Oper. Co., LLC | Wichita Falls, TX 76301 | Oil Operator | May 2007 |
| 389 | Hamman, Blake | Graham, TX 76450 | Oil & Gas Operator | Jul 2020 |
| 390 | Hammon Properties | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 1996 |
| 391 | Hane Operating, Inc. | Santa Anna, TX 76878 | Oil & Gas Operator | Sep 2005 |
| 392 | Hanks, Christopher Glenn | Gainesville, TX 76240 | Oil & Gas Operator | Feb 2026 |
| 393 | Harbor Resources LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Feb 2026 |
| 394 | Hardrock Operating Company, Inc. | Fort Worth, TX 76161 | Oil & Gas Operator | Feb 2026 |
| 395 | Harrell Operating Inc | Graham, TX 76450 | Oil & Gas Operator | Sep 2005 |
| 396 | Harrell Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Jun 2008 |
| 397 | Harrell, Charles | Graham, TX 76450 | Oil & Gas Operator | Dec 2000 |
| 398 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Feb 2026 |
| 399 | Hatler Oil Company, Inc. | Graham, TX 76450 | Oil & Gas Operator | Sep 2000 |
| 400 | Hawkins, G. A. | Graham, TX 76450 | Oil & Gas Operator | Dec 2013 |