| 301 | Warner Oil Prod | | Oil Operator | Apr 1995 |
| 302 | Warner Production LLC | Mannford, OK 74044-6182 | Oil & Gas Operator | Jun 2025 |
| 303 | Warner Sisters, LLC | Thompsons Sta, TN 37179 | Oil Operator | Sep 2025 |
| 304 | Warner Ventures Inc | | Oil Operator | Dec 2024 |
| 305 | Warner, Mark T. Oil Co | Pampa, TX 79065 | Oil & Gas Operator | Jul 2021 |
| 306 | Warner-Pawel | Alice, TX 78333 | Oil & Gas Operator | Sep 2025 |
| 307 | Warnock Operating Company, LLC | Graham, TX 76450 | Oil & Gas Operator | Jul 2013 |
| 308 | Warpath Energy Inc | Broken Arrow, OK 74014-1118 | Oil & Gas Operator | Apr 2018 |
| 309 | Warrego Oil & Gas LLC | Lander, WY 82520 | Oil Operator | May 2018 |
| 310 | Warren American Oil Co | Tulsa, OK 74147 | Oil & Gas Operator | Jul 2025 |
| 311 | Warren American Oil Company LLC | Tulsa, OK 74147 | Oil & Gas Operator | Sep 2025 |
| 312 | Warren Drilling Co | Dexter City, OH 45727 | Oil & Gas Operator | Dec 2024 |
| 313 | Warren E & P Inc | Dallas, TX 75240 | Oil & Gas Operator | Jun 2025 |
| 314 | Warren Enterprises Inc | Gillette, WY 82718 | Oil Operator | Dec 2022 |
| 315 | Warren Producers Inc | Bowling Green, KY 42102 | Oil & Gas Operator | Dec 2017 |
| 316 | Warren Production Services | Caldwell, TX 77836 | Oil & Gas Operator | Sep 2025 |
| 317 | Warren, Earl T. | San Angelo, TX 76906 | Oil & Gas Operator | Sep 2025 |
| 318 | Warren, James E. | Arkansas City, KS 67005 | Oil Operator | Nov 2009 |
| 319 | Warren, Joe H. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2001 |
| 320 | Warren, Malcolm | Corfu, NY 14036 | Gas Operator | Dec 2024 |
| 321 | Warrior Exploration LLC | Sapulpa, OK 74067-1912 | Oil & Gas Operator | May 2025 |
| 322 | Warrior Inc | Hobbs, NM 88241 | Oil & Gas Operator | Feb 1998 |
| 323 | Warrior Met Coal Gas, LLC | Brookwood, AL 35444 | Gas Operator | May 2025 |
| 324 | Warrior Resources Inc. | Mexia, TX 76667 | Oil & Gas Operator | Sep 2025 |
| 325 | Warwick Associates LC | Oklahoma City, OK 73112 | Oil & Gas Operator | Jun 2025 |
| 326 | Warwick Oil & Gas, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 1993 |
| 327 | Warwick Oil Corp. | | Oil & Gas Operator | Mar 1990 |
| 328 | Warwick-Artemis, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 2025 |
| 329 | Warwick-Bacchus LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | May 2025 |
| 330 | Warwick-Jupiter LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | May 2025 |
| 331 | Warwick-Minerva LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | May 2025 |
| 332 | Wasatch Oil & Gas Corp | Farmington, UT 84025-0699 | Oil & Gas Operator | Mar 2002 |
| 333 | Wash, Robert C. | Forsan, TX 79733 | Oil & Gas Operator | Nov 2000 |
| 334 | Wash, Robert C. Inc. | Forsan, TX 79733 | Oil & Gas Operator | Sep 2025 |
| 335 | Washakie Energies Company | Worland, WY 82401 | Oil & Gas Operator | Dec 2019 |
| 336 | Washakie Oil Company | | Oil & Gas Operator | Dec 1989 |
| 337 | Washburn Lee | Newcastle, WY 82701 | Oil Operator | Jan 2025 |
| 338 | Washington Energy Co LLC | Canonsburg, PA 15317-0400 | Oil & Gas Operator | Dec 2024 |
| 339 | Washington Energy Exploration | | Oil & Gas Operator | Dec 1997 |
| 340 | Washita Energy Inc | Pauls Valley, OK 73075-0923 | Oil & Gas Operator | Mar 2015 |
| 341 | Washita Oil And Gas, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 342 | Washita Production Company | Tulsa, OK 74136 | Oil & Gas Operator | May 2006 |
| 343 | Wassom, Claude J | | Oil & Gas Operator | May 2013 |
| 344 | Wasson Billy C | Morris, OK 74445 | Oil & Gas Operator | Apr 2025 |
| 345 | Waste TRMT Corp | Washington, PA 15301-0558 | Oil & Gas Operator | Dec 2024 |
| 346 | Wat Khmer Temple* | | Oil Operator | Dec 2003 |
| 347 | Watchtower Petroleum, LLC | | Oil & Gas Operator | Jun 2025 |
| 348 | Watco Energy | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2025 |
| 349 | Watco Energy, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Apr 1996 |
| 350 | Water Works Engineering, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Jan 1998 |
| 351 | Waterbridge Arkoma Operating LLC | Houston, TX 77056 | Oil Operator | May 2025 |
| 352 | Waterbridge Texas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2025 |
| 353 | Waterco Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2000 |
| 354 | Waterford Energy Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 1998 |
| 355 | Waterford Production Co | | Oil Operator | Oct 1992 |
| 356 | Waterloo Exploration LLC | Tulsa, OK 74136-4226 | Gas Operator | May 2025 |
| 357 | Waters Eng. & Operating, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Sep 2013 |
| 358 | Waters Petroleum | Albany, TX 76430 | Oil & Gas Operator | Aug 2016 |
| 359 | Watertech Disposal | Enid, OK 73702-0125 | Oil Operator | Sep 2007 |
| 360 | Watkins J L | Henryetta, OK 74437 | Oil & Gas Operator | Jun 2025 |
| 361 | Watkins Joe L | Boynton, OK 74422 | Oil & Gas Operator | Mar 2015 |
| 362 | Watkins Oil Company | Claremore, OK 74017 | Oil & Gas Operator | May 2018 |
| 363 | Watkins Paul | Bixby, OK 74008-4018 | Oil & Gas Operator | Jun 2004 |
| 364 | Watkins Production Company | Dallas, TX 75229 | Oil & Gas Operator | Feb 2008 |
| 365 | Watkins, J. B. | Borger, TX 79007 | Oil & Gas Operator | May 2009 |
| 366 | Watson Energy Investments, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2025 |
| 367 | Watson Energy, L.L.C. | | Oil & Gas Operator | Jun 2005 |
| 368 | Watson Fred S Revocable Trust | Muskogee, OK 74402-1928 | Oil Operator | Nov 2017 |
| 369 | Watson Oil & Gas Co. | Gorman, TX 76454 | Oil & Gas Operator | Jan 2002 |
| 370 | Watson Oil & Gas Corp. | | Oil Operator | Aug 1994 |
| 371 | Watson Oil & Gas, Inc. | Spicewood, TX 78669 | Oil & Gas Operator | Sep 2025 |
| 372 | Watson Oil Corporation | | Oil & Gas Operator | Jun 1981 |
| 373 | Watson Operating Company | Pampa, TX 79066 | Oil & Gas Operator | Dec 2003 |
| 374 | Watson Packer Employee Fund | Monahans, TX 79756 | Oil & Gas Operator | Sep 2025 |
| 375 | Watson Petroleum | | Oil & Gas Operator | Feb 1990 |
| 376 | Watson Petroleum Inc | Wichita, KS 67208 | Oil & Gas Operator | May 2010 |
| 377 | Watson Wayne W | Cambridge, OH 43725-3024 | Oil & Gas Operator | Dec 2002 |
| 378 | Watson, B. G. Oil Field Salv Inc | Coleman, TX 76834 | Oil & Gas Operator | Mar 2000 |
| 379 | Watson, Ben | Blue Mound, KS 66010 | Oil Operator | Oct 2008 |
| 380 | Watt Energy, LLC | Port Barre, LA 70577 | Oil & Gas Operator | Sep 2025 |
| 381 | Watt Mineral Holdings LLC | | Oil Operator | Aug 2025 |
| 382 | Watt, Larry | Copan, OK 74022 | Oil Operator | Oct 2019 |
| 383 | Watt, Larry D | | Oil Operator | Aug 2024 |
| 384 | Wattles, Richard F. | Colden, NY 14033 | Gas Operator | Dec 2024 |
| 385 | Watts And Hill Oil Company | | Oil Operator | Sep 1995 |
| 386 | Watts Keith | Bristow, OK 74010-4996 | Oil Operator | May 2025 |
| 387 | Watts Oil And Gas | Hardtner, KS 67057 | Oil Operator | Apr 2006 |
| 388 | Watts Tank Truck Service, Inc. | Hamilton, KS 66853 | Oil Operator | Apr 2025 |
| 389 | Watts, J R | | Oil Operator | Dec 2009 |
| 390 | Watusi Energy LLC | Midland, TX 79710 | Oil & Gas Operator | Sep 2025 |
| 391 | Wausau Development Corporation | Laurel, MS 39440 | Oil & Gas Operator | Sep 2019 |
| 392 | Wave Energy LLC | Jennings, OK 74038 | Oil Operator | May 2025 |
| 393 | Wave Petroleum Operating LLC | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 394 | Wavefront Energy & Envir Serv USA Inc | Edmonton, AB T6B3P6 | Oil Operator | Apr 2015 |
| 395 | Wavepoint Realty Ny, LLC | North East, PA 16428 | Gas Operator | Dec 2024 |
| 396 | Wavetech Helium Inc | | Gas Operator | Jun 2025 |
| 397 | Way Drilling Com | | Oil & Gas Operator | Mar 1993 |
| 398 | Way, Ralph L., Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 399 | Wayland Drilling & Explr., Inc. | Grapevine, TX 76099 | Oil & Gas Operator | Apr 2006 |
| 400 | Waylander LLC | Plano, TX 75025 | Oil & Gas Operator | Sep 2025 |