| 301 | Ballou Oil Well Service | | Oil Operator | Mar 2025 |
| 302 | Ballyoil Inc | Chickasha, OK 73018 | Oil & Gas Operator | Jul 2023 |
| 303 | Balsam R C | | Oil & Gas Operator | Apr 1991 |
| 304 | Baltic Royalty Corp. | Dallas, TX 75209 | Oil & Gas Operator | Mar 2008 |
| 305 | Bam Energy, Inc. | San Antonio, TX 78216 | Gas Operator | Sep 1991 |
| 306 | Bam Operating, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Nov 2014 |
| 307 | Bam Permian Operating, LLC | Midland, TX 79707 | Oil & Gas Operator | Jul 2025 |
| 308 | Bam Production Company | Granbury, TX 76048 | Oil & Gas Operator | Aug 2003 |
| 309 | Bammert, H. L. | Weesatche, TX 77993 | Oil & Gas Operator | Sep 2013 |
| 310 | Bamsaw Oil Inc | Sapulpa, OK 74067 | Oil Operator | Dec 1993 |
| 311 | Banam Corporation | Midland, TX 79702 | Oil & Gas Operator | Nov 2013 |
| 312 | Bancequity Petroleum Corporation | Macedonia, OH 44056 | Oil & Gas Operator | Dec 2024 |
| 313 | Bancroft Oil LLC | Chanute, KS 66720 | Oil Operator | Feb 2025 |
| 314 | Bancroft Venture LLC | Kerens, TX 75144 | Oil Operator | Jul 2025 |
| 315 | Bandera Eagle Ford, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jul 2025 |
| 316 | Bandera Energy Company | | Oil & Gas Operator | Mar 1986 |
| 317 | Bandera Exploration Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2017 |
| 318 | Bandera Oil & Gas Inc | Fulshear, TX 77441 | Oil & Gas Operator | Jul 2025 |
| 319 | Bandera Petroleum, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Nov 2018 |
| 320 | Banding M R Inc | Gillette, WY 82717 | Oil & Gas Operator | Jun 2025 |
| 321 | Bandit Energy, LLC | Perry, MI 48872 | Oil Operator | Dec 2023 |
| 322 | Bandolier Energy LLC | | Oil & Gas Operator | Mar 2020 |
| 323 | Bands Company Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 2014 |
| 324 | Bands Group LLC | Millersburg, OH 44654 | Oil & Gas Operator | Dec 2023 |
| 325 | Bandwheel Production Co LLC | | Oil Operator | Apr 2025 |
| 326 | Bandy Paul L | | Oil Operator | Nov 1996 |
| 327 | Bandy, Paul & Marjorie, Irrevocable Trust | Canton, KS 67428 | Oil & Gas Operator | Nov 2009 |
| 328 | Baney Well Service Inc | Denver, CO 80237 | Oil Operator | Jun 2016 |
| 329 | Bangert H E | | Gas Operator | Apr 1996 |
| 330 | Bank Oil Services | Muskogee, OK 74403-4025 | Oil & Gas Operator | Mar 2020 |
| 331 | Bankhead E & P LLC | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Jul 2025 |
| 332 | Bankhead Operating Corp. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2025 |
| 333 | Bankoff Oil Comp | | Oil Operator | Jun 1995 |
| 334 | Bankoff Oil Company | Tulsa, OK 74170 | Oil Operator | Sep 2003 |
| 335 | Banks And Conrad | | Oil Operator | Sep 1987 |
| 336 | Banks Oil - Lee | | Oil & Gas Operator | Jun 1995 |
| 337 | Banks Oil Co | | Oil & Gas Operator | Mar 2025 |
| 338 | Banks Operating Company | | Oil & Gas Operator | Jul 1989 |
| 339 | Banks, Francis C | Fordsville, KY 42343 | Oil Operator | Dec 2018 |
| 340 | Banks, R. C. | Midland, TX 79702 | Oil & Gas Operator | Apr 2016 |
| 341 | Banlee Energy | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2010 |
| 342 | Banner Oil | | Oil Operator | Nov 2019 |
| 343 | Banner Oil & Gas LLC | Oklahoma City, OK 73159 | Oil & Gas Operator | Apr 2025 |
| 344 | Banner Operating, LLC | Austin, TX 78735 | Oil & Gas Operator | Jul 2025 |
| 345 | Banner Petroleum LLC | | Oil Operator | Dec 2015 |
| 346 | Bannon Energy Inc | Houston, TX 77068 | Oil & Gas Operator | Jun 1998 |
| 347 | Bannon Operating Inc | Houston, TX 77068 | Oil & Gas Operator | Sep 2003 |
| 348 | Banquet Production, LLC | Woodson, TX 76491 | Oil Operator | Jul 2025 |
| 349 | Banta And Haigh | Aurora, CO 80014 | Oil & Gas Operator | Feb 1998 |
| 350 | Bar CT Ranch, LP | Caney, KS 67333 | Oil Operator | Mar 2025 |
| 351 | Bar D Energy, LLC | Lubbock, TX 79423 | Oil & Gas Operator | Jul 2025 |
| 352 | Bar H Production, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 1997 |
| 353 | Bar L Producers | Fritch, TX 79036 | Oil & Gas Operator | Feb 2025 |
| 354 | Bar Mesa Resources Inc | Roosevelt, UT 84066 | Oil & Gas Operator | Sep 2012 |
| 355 | Bar Operating Production Co. | Abilene, TX 79604 | Oil & Gas Operator | Feb 2004 |
| 356 | Bar V Energy LLC | Poteet, TX 78065 | Oil Operator | Jul 2025 |
| 357 | Bar Val | Wadsworth, OH 44281 | Oil & Gas Operator | Dec 1998 |
| 358 | Bar-G Oil & Gas | New Concord, OH 43762 | Oil & Gas Operator | Dec 2016 |
| 359 | Bar-Mac Investments Inc. | Brenham, TX 77834 | Oil & Gas Operator | Jun 2017 |
| 360 | Bara Corporation | Flower Mound, TX 75027 | Oil & Gas Operator | Apr 2004 |
| 361 | Barataria Production SVCS, LLC | | Oil Operator | Sep 2009 |
| 362 | Barb Oil Co | Gambier, OH 43022 | Oil & Gas Operator | Dec 1986 |
| 363 | Barbara Fasken | Midland, TX 79701 | Oil & Gas Operator | Dec 1995 |
| 364 | Barbe D F | Recluse, WY 82725 | Oil & Gas Operator | Dec 2000 |
| 365 | Barbee, Bill J. | Amarillo, TX 79101 | Oil & Gas Operator | Dec 1994 |
| 366 | Barbee, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2008 |
| 367 | Barbee, R.L. Operating, Inc. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Jul 2025 |
| 368 | Barber Oil Inc | Carlsbad, NM 88220 | Oil Operator | Mar 1994 |
| 369 | Barber Oil LLC | Tulsa, OK 74137-3575 | Oil & Gas Operator | Apr 2025 |
| 370 | Barber, B. S. | Kilgore, TX 75662 | Oil & Gas Operator | Nov 1998 |
| 371 | Barbour Energy C | | Gas Operator | Jun 1993 |
| 372 | Barbour Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Jul 2025 |
| 373 | Barby Energy Corporation | Woodward, OK 73802-1660 | Oil & Gas Operator | Apr 2025 |
| 374 | Barclay Petroleum Inc | Bremen, OH 43107 | Oil & Gas Operator | Dec 2017 |
| 375 | Barco Co. | | Oil & Gas Operator | Dec 2000 |
| 376 | Barco Energy, Inc. | Great Bend, KS 67530 | Oil Operator | Jun 2001 |
| 377 | Barco Oil Co. | | Oil Operator | Dec 2009 |
| 378 | Barcoo Exploration Inc. | | Gas Operator | Jan 1993 |
| 379 | Barden/Bass O & G Expl. Co. Inc. | Terrell, TX 75160 | Oil & Gas Operator | Mar 2008 |
| 380 | Barden/Bass Oil & Gas Exploration Company Inc | Terrell, TX 75160-3143 | Oil Operator | May 2025 |
| 381 | Barfield Oil Cor | | Oil Operator | Oct 1995 |
| 382 | Barfield Oil Corporation | | Oil & Gas Operator | Mar 2001 |
| 383 | Barger Petroleum Co. | Irving, TX 75061 | Oil & Gas Operator | Jan 2019 |
| 384 | Bargo Energy Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 385 | Bargo Energy Corporation | | Oil & Gas Operator | Apr 2000 |
| 386 | Bargo Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2014 |
| 387 | Barham-Boyne Oil Co. Inc. | | Oil Operator | Dec 1992 |
| 388 | Barj Oil Co. | Brownfield, TX 79316 | Oil & Gas Operator | Jul 2025 |
| 389 | Barker Oil | | Oil Operator | Sep 2023 |
| 390 | Barker Production Co. | Shamrock, TX 79079 | Oil & Gas Operator | Mar 2010 |
| 391 | Barker Production Co., LP | San Angelo, TX 76904 | Oil & Gas Operator | Jul 2025 |
| 392 | Barker, Rodney | Shamrock, TX 79079 | Oil & Gas Operator | Aug 2012 |
| 393 | Barline Oil, LLC | Wichita, KS 67206 | Oil Operator | Nov 2019 |
| 394 | Barn Owls LLC | | Oil & Gas Operator | May 2025 |
| 395 | Barnard Oil Operations | | Oil Operator | Mar 2025 |
| 396 | Barnard Wells Co | | Oil Operator | Nov 2000 |
| 397 | Barnard, Roy A | Cleveland, OK 74020-4403 | Oil Operator | Apr 2025 |
| 398 | Barnes Darrell | Drumright, OK 74030-5879 | Oil & Gas Operator | Apr 2025 |
| 399 | Barnes Exploration Co. | Nashville, TN 37209 | Oil & Gas Operator | Feb 1995 |
| 400 | Barnes Hugoton C | | Gas Operator | Oct 1993 |