| 301 | Banks Oil Co | | Oil & Gas Operator | Feb 2026 |
| 302 | Banks, R. C. | Midland, TX 79702 | Oil & Gas Operator | Apr 2016 |
| 303 | Banner Oil | | Oil Operator | Nov 2019 |
| 304 | Banner Oil & Gas LLC | Oklahoma City, OK 73159 | Oil & Gas Operator | Mar 2026 |
| 305 | Bar CT Ranch, LP | Caney, KS 67333 | Oil Operator | Feb 2026 |
| 306 | Barbour Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Jun 2026 |
| 307 | Barco Energy, Inc. | Great Bend, KS 67530 | Oil Operator | Jun 2001 |
| 308 | Barfield Oil Cor | | Oil Operator | Oct 1995 |
| 309 | Bargo Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2014 |
| 310 | Barker Oil | | Oil Operator | Sep 2023 |
| 311 | Barline Oil, LLC | Wichita, KS 67206 | Oil Operator | Nov 2019 |
| 312 | Barnard Oil Operations | | Oil Operator | Feb 2026 |
| 313 | Barnard Wells Co | | Oil Operator | Nov 2000 |
| 314 | Barnes, Cordell W. | Caney, KS 67333 | Oil Operator | Dec 1986 |
| 315 | Barnes, L.- Oil Company | | Oil Operator | Jan 2014 |
| 316 | Barnett Oil | | Oil Operator | Oct 2009 |
| 317 | Barnett Oil Co | | Oil & Gas Operator | Dec 2009 |
| 318 | Barr Energy LLC | | Oil Operator | Jun 2010 |
| 319 | Barracuda Operating Company | Ness City, KS 67560 | Oil Operator | Feb 2026 |
| 320 | Bartling Oil Com | | Gas Operator | Dec 1992 |
| 321 | Bartling Oil Company | Austin, TX 78733 | Gas Operator | Jun 2017 |
| 322 | Barton Exploration, Inc. | Hays, KS 67601 | Oil & Gas Operator | Feb 2026 |
| 323 | Barton Oil Compa | | Oil Operator | Jan 1986 |
| 324 | Barton, Athol Oil , Inc. | Russell, KS 67665 | Oil Operator | Jul 2001 |
| 325 | Barts Oilfield Servi | | Oil Operator | Feb 2026 |
| 326 | Baruch-Foster Co | | Oil Operator | Apr 1989 |
| 327 | Basgall Oil LLC | Hays, KS 67601 | Oil Operator | Feb 2026 |
| 328 | Basin Operating Services LLC | Oklahoma City, OK 73106-5615 | Oil & Gas Operator | Feb 2026 |
| 329 | Bates Oil | | Oil Operator | Feb 2020 |
| 330 | Bauer Oil Investment LLC | Cleveland, MO 64734 | Oil Operator | Feb 2026 |
| 331 | Bayonet Petroleum LLC | Moran, KS 66755 | Oil Operator | Feb 2026 |
| 332 | BC Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2026 |
| 333 | Bce-Mach III LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2026 |
| 334 | Bce-Mach LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2026 |
| 335 | BDW Oil Company LLC | Chanute, KS 66720 | Oil Operator | Oct 2020 |
| 336 | Beacon Explorati | | Oil Operator | Apr 1987 |
| 337 | Bear Petroleum | | Oil & Gas Operator | Dec 1996 |
| 338 | Bear Petroleum Inc | Haysville, KS 67060-0438 | Oil & Gas Operator | Mar 2015 |
| 339 | Bear Petroleum LLC | Haysville, KS 67060 | Oil & Gas Operator | Feb 2026 |
| 340 | Beard Oil Compan | | Oil & Gas Operator | Jul 1987 |
| 341 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Apr 2026 |
| 342 | Beaver Oil Company, A General Partnership | Beaver, OK 73792 | Gas Operator | Aug 2022 |
| 343 | Beaver Unit (The) | Great Bend, KS 67530 | Oil Operator | Jul 1989 |
| 344 | Beck Resources Incorporated | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2026 |
| 345 | Becker Oil Corpo | | Oil & Gas Operator | Dec 1996 |
| 346 | Becker Oil Corporation | Ponca City, OK 74602 | Oil & Gas Operator | Feb 2026 |
| 347 | Becker, Clyde M. | Ponca City, OK 74601 | Oil & Gas Operator | Oct 2009 |
| 348 | Becker, Lavern | Russell, KS 67665 | Oil Operator | Oct 1995 |
| 349 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 350 | Bell Brothers | | Oil Operator | Feb 2026 |
| 351 | Bell Oil Company | | Oil & Gas Operator | Oct 1985 |
| 352 | Bellmyer, Fred L | Caney, KS 67333 | Oil Operator | May 1997 |
| 353 | Bellnorth Petrol | | Oil Operator | Aug 1986 |
| 354 | Belport Oil Inc | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2026 |
| 355 | Bemco, LLC | Medicine Lodge, KS 67104 | Oil Operator | Feb 2026 |
| 356 | Benchmark Energy LLC | Pratt, KS 67124 | Oil & Gas Operator | Sep 2023 |
| 357 | Benchmark Oil & | | Oil Operator | Dec 1996 |
| 358 | Benchmark Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 359 | Bengalia Land And Cattle Company | Tulsa, OK 74152 | Oil & Gas Operator | Jan 2026 |
| 360 | Bengston Oil, LLC | Windom, KS 67491 | Oil Operator | Aug 2024 |
| 361 | Bengtson, Earl L. | Salina, KS 67401 | Oil Operator | Mar 2007 |
| 362 | Bennett & Schult | | Oil Operator | Jul 1995 |
| 363 | Bennett & Schulte Oil Co., A General Partnership | Russell, KS 67665 | Oil Operator | Feb 2026 |
| 364 | Bennett Oil Comp | | Oil Operator | Mar 1992 |
| 365 | Bennett Oil Company, LLC | Russell, KS 67665 | Oil Operator | Feb 2026 |
| 366 | Benson Mineral G | | Oil & Gas Operator | Dec 1995 |
| 367 | Benson Mineral Group, Inc. | Denver, CO 80202 | Oil & Gas Operator | Apr 2022 |
| 368 | Bentley & Laing | Wichita Falls, TX 76302 | Oil & Gas Operator | Feb 2002 |
| 369 | Bentley Oil & Gas Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2026 |
| 370 | Berco Oil Co., A General Partnership | Buffalo, KS 66717 | Oil & Gas Operator | Dec 2025 |
| 371 | Beredco Incorpor | | Oil & Gas Operator | Dec 1993 |
| 372 | Beren Corporatio | | Oil & Gas Operator | Dec 1995 |
| 373 | Beren Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jun 2026 |
| 374 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | May 2026 |
| 375 | Berentz Drilling | | Oil Operator | Jul 1995 |
| 376 | Berentz Drilling Co., Inc. | Wichita, KS 67278 | Oil Operator | Feb 2026 |
| 377 | Berexco Inc. | Wichita, KS 67208 | Oil & Gas Operator | Oct 2009 |
| 378 | Berexco Incorpor | | Oil & Gas Operator | Dec 1996 |
| 379 | Berexco LLC | Wichita, KS 67206 | Oil & Gas Operator | Jun 2026 |
| 380 | Bergman Oil Co., L.C. | Wichita, KS 67202 | Oil Operator | Sep 2007 |
| 381 | Bergman Oil Comp | | Oil Operator | Mar 1995 |
| 382 | Bergman, Anna F. Trust, A General Partnership | Shawnee, KS 66203 | Oil Operator | Nov 2019 |
| 383 | Berky Resources | | Oil & Gas Operator | Sep 1994 |
| 384 | Berry Petroleum Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2014 |
| 385 | Beymer & Beymer | | Gas Operator | Dec 2009 |
| 386 | BG-5, Inc. | Rantoul, KS 66079 | Oil Operator | Feb 2026 |
| 387 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 388 | BHP Petroleum Company Inc | Houston, TX 77057 | Oil & Gas Operator | Jun 2016 |
| 389 | Bibs Oil Corpora | | Oil & Gas Operator | Apr 1987 |
| 390 | Bickle Energies LLC | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 391 | Bieberle Oil & Gas Inc. | Medicine Lodge, KS 67104 | Oil & Gas Operator | Feb 2026 |
| 392 | Big 'J' Prod Com | | Oil & Gas Operator | Aug 1992 |
| 393 | Big 'O' | | Oil Operator | Feb 2026 |
| 394 | Big Bear Resourc | | Oil Operator | Jan 1989 |
| 395 | Big Eight Energy | El Dorado, KS 67042 | Oil Operator | Apr 2001 |
| 396 | Big Eight Energy, L.L.C. | Wichita, KS 67275 | Oil Operator | Dec 2009 |
| 397 | Big Horn Oil Co Inc | Great Bend, KS 67530 | Oil & Gas Operator | May 2013 |
| 398 | Big Jack Oil & G | | Oil Operator | Sep 1986 |
| 399 | Big Sky Gas Co. | Tribune, KS 67879 | Gas Operator | Dec 2001 |
| 400 | Big Ticket, LLC | Lawrence, KS 66047 | Oil Operator | Jan 2026 |