| 401 | Baker Oil & Gas | St Louisville, OH 43071 | Oil & Gas Operator | Sep 2014 |
| 402 | Bakin Oil & Gas Inc | | Oil & Gas Operator | Apr 2020 |
| 403 | Balco Energy Inc | Duncan, OK 73533 | Oil & Gas Operator | Feb 2026 |
| 404 | Baldrachi Oil Properties LLC | Bartlesville, OK 74006-1622 | Oil Operator | Feb 2026 |
| 405 | Baldridge, Doug | | Oil & Gas Operator | Jul 2018 |
| 406 | Bale Charles R | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2014 |
| 407 | Bale Corporation (The) | Edmond, OK 73083-6863 | Oil & Gas Operator | Dec 2019 |
| 408 | Ballard & Associates Inc | Billings, MT 59102-5406 | Oil & Gas Operator | Feb 2000 |
| 409 | Ballard Petroleum LLC | Billings, MT 59102-5406 | Oil & Gas Operator | Apr 2014 |
| 410 | Ballew Oil & Gas Inc | Yale, OK 74085 | Oil Operator | Sep 1995 |
| 411 | Ballyoil Inc | Chickasha, OK 73018 | Oil & Gas Operator | Jul 2023 |
| 412 | Bam Energy Inc | San Antonio, TX 78216 | Gas Operator | Sep 1991 |
| 413 | Bamsaw Oil Inc | Sapulpa, OK 74067 | Oil Operator | Dec 1993 |
| 414 | Bandolier Energy LLC | | Oil & Gas Operator | Mar 2020 |
| 415 | Bandwheel Production Co LLC | | Oil Operator | Feb 2026 |
| 416 | Bank Oil Services | Muskogee, OK 74403-4025 | Oil & Gas Operator | Mar 2020 |
| 417 | Banner Oil & Gas LLC | Oklahoma City, OK 73159 | Oil & Gas Operator | Feb 2026 |
| 418 | Bannon Operating Inc | Houston, TX 77068 | Oil & Gas Operator | Sep 2003 |
| 419 | Barbee, Bill J. | Amarillo, TX 79101 | Oil & Gas Operator | Dec 1994 |
| 420 | Barber Oil LLC | Tulsa, OK 74137-3575 | Oil & Gas Operator | Feb 2026 |
| 421 | Barbour Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | May 2026 |
| 422 | Barby Energy Corporation | Woodward, OK 73802-1660 | Oil & Gas Operator | Jan 2026 |
| 423 | Barden/Bass Oil & Gas Exploration Company Inc | Terrell, TX 75160-3143 | Oil Operator | Jan 2026 |
| 424 | Bargo Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2014 |
| 425 | Barker Production Co., LP | San Angelo, TX 76904 | Oil & Gas Operator | May 2026 |
| 426 | Barnard, Roy A | Cleveland, OK 74020-4403 | Oil Operator | Feb 2026 |
| 427 | Barnes Darrell | Drumright, OK 74030-5879 | Oil & Gas Operator | Feb 2026 |
| 428 | Barnes Exploration Co. | Nashville, TN 37209 | Oil & Gas Operator | Feb 1995 |
| 429 | Barnes Producing Company LLC | Ardmore, OK 73401-8882 | Oil Operator | Jan 2026 |
| 430 | Barnett Darrell | Bristow, OK 74010-4926 | Oil Operator | Jan 2019 |
| 431 | Barnett James E | Skiatook, OK 74070-0100 | Oil & Gas Operator | May 2013 |
| 432 | Barnett John | Skiatook, OK 74070 | Oil & Gas Operator | Feb 2026 |
| 433 | Baron Exploration Company | Edmond, OK 73034 | Oil & Gas Operator | May 2026 |
| 434 | Barr Energy LLC | | Oil Operator | Jun 2010 |
| 435 | Barrett Drilling Company | Shawnee, OK 74802-1345 | Oil & Gas Operator | Jun 2013 |
| 436 | Barrett Oil Co. | White Oak, TX 75693 | Oil & Gas Operator | Dec 2024 |
| 437 | Barrett Resources Corporation | Denver, CO 80202 | Oil & Gas Operator | Aug 2003 |
| 438 | Barrier Resources,L.L.C. | Cedar Park, TX 78613 | Oil & Gas Operator | Aug 2003 |
| 439 | Barta Enterprises | Oklahoma City, OK 73162-1728 | Oil & Gas Operator | Jan 2026 |
| 440 | Barton Edward Lee | Mounds, OK 74047-4177 | Oil Operator | Jan 2026 |
| 441 | Baruch Foster Corporation | Oklahoma City, OK 73126-6770 | Oil & Gas Operator | Feb 2001 |
| 442 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | May 2026 |
| 443 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | May 2026 |
| 444 | Basin Operating Services II LLC | Oklahoma City, OK 73106-5615 | Oil & Gas Operator | Jan 2026 |
| 445 | Basin Operating Services LLC | Oklahoma City, OK 73106-5615 | Oil & Gas Operator | Jan 2026 |
| 446 | Basis Resources Group LLC | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2025 |
| 447 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 448 | Batco Oil Company | Edmond, OK 73083 | Oil & Gas Operator | Feb 2002 |
| 449 | Bateman'S Bay Exploration, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Jan 2026 |
| 450 | Baugh Allan L | Drumright, OK 74030-5914 | Oil & Gas Operator | Feb 2026 |
| 451 | Baulch Enterprises | Ada, OK 74820-8623 | Oil Operator | Dec 1999 |
| 452 | Baxter And Associates Inc | Ada, OK 74820 | Oil & Gas Operator | Feb 2026 |
| 453 | Baxter Randall H | Tulsa, OK 74136-0908 | Oil & Gas Operator | Apr 2020 |
| 454 | Bay Oaks Resources LLC | Fort Smith, AR 72913-3129 | Gas Operator | Feb 2018 |
| 455 | Bay Petroleum Corporation | Lakewood, FL 34202-2852 | Oil & Gas Operator | Mar 2015 |
| 456 | Bayou Oil LLC | Ardmore, OK 73401 | Oil & Gas Operator | Dec 2025 |
| 457 | Bayou Resources Inc | Houston, TX 77056 | Oil & Gas Operator | Jan 2015 |
| 458 | Bays Exploration Inc | Oklahoma City, OK 73116-9044 | Oil & Gas Operator | Feb 2026 |
| 459 | Baytech Inc | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 460 | BC Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2026 |
| 461 | Bce-Mach II LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | May 2026 |
| 462 | Bce-Mach III LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | May 2026 |
| 463 | Bce-Mach LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2026 |
| 464 | BD Operating LLC | Artesia, NM 88210 | Oil & Gas Operator | Feb 2026 |
| 465 | BDB LLC | Hennessey, OK 73742 | Oil & Gas Operator | Dec 2017 |
| 466 | Be Anadarko II, LLC | Austin, TX 78731 | Oil & Gas Operator | May 2026 |
| 467 | Be Anadarko LLC | Wimberley, TX 78676-4418 | Oil & Gas Operator | Jan 2024 |
| 468 | Beach Operating Company | Tulsa, OK 74136-5577 | Oil & Gas Operator | Mar 2013 |
| 469 | Bear Energy LLC | Drumright, OK 74030-0311 | Oil & Gas Operator | Apr 2022 |
| 470 | Bear Petroleum Inc | Haysville, KS 67060-0438 | Oil & Gas Operator | Mar 2015 |
| 471 | Bear Petroleum LLC | Haysville, KS 67060 | Oil & Gas Operator | Jan 2026 |
| 472 | Bear Productions Inc | Kinta, OK 74552 | Oil & Gas Operator | Jan 2026 |
| 473 | Beard English & Martin | Bartlesville, OK 74003 | Oil Operator | Nov 2005 |
| 474 | Beard Oil Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2013 |
| 475 | Beasley Oil Company | Oklahoma City, OK 73120 | Oil & Gas Operator | Jun 2020 |
| 476 | Becca Oil LLC | Cushing, OK 74023-1347 | Oil & Gas Operator | Feb 2026 |
| 477 | Bechel Oil, LLC. | Maiden Rock, WI 54750 | Oil Operator | Feb 2022 |
| 478 | Beck Oil & Gas Inc. | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2024 |
| 479 | Beck Oil & Gas, L.L.C. | Duncan, OK 73533 | Oil & Gas Operator | Jan 2026 |
| 480 | Beck Pump & Supply Inc | Hennessey, OK 73742-0175 | Oil & Gas Operator | Nov 2019 |
| 481 | Beck Resources Incorporated | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2026 |
| 482 | Becker Oil Corporation | Ponca City, OK 74602 | Oil & Gas Operator | Jan 2026 |
| 483 | Becktol Linda G | Morris, OK 74445 | Oil & Gas Operator | Jun 2025 |
| 484 | Becsul Energy | Oklahoma City, OK 73127 | Oil Operator | Jan 1992 |
| 485 | Becsul Energy Inc | Oklahoma City, OK 73127-4249 | Oil & Gas Operator | Dec 2025 |
| 486 | Bedford Energy Inc | Oklahoma City, OK 73112-4731 | Oil & Gas Operator | Sep 2016 |
| 487 | Bee Cee Inc | Denton, TX 76206-0689 | Oil & Gas Operator | May 2013 |
| 488 | Beeler Phillip F | Norman, OK 73072-7522 | Oil & Gas Operator | Dec 2014 |
| 489 | Behlen Incorporated | | Oil Operator | Jun 2001 |
| 490 | Beisch, Rusty | Windthorst, TX 76389 | Oil & Gas Operator | May 2026 |
| 491 | Belco Development Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Feb 1994 |
| 492 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 493 | Belcor Inc. | Irvine, CA 92714 | Oil & Gas Operator | Nov 2000 |
| 494 | Belisle Pete H | Tulsa, OK 74133 | Oil & Gas Operator | Apr 2015 |
| 495 | Bell & Kinley Company LLC | Piedmont, OK 73078-8918 | Oil & Gas Operator | Jul 2021 |
| 496 | Bell Jack | Beggs, OK 74421-2107 | Oil & Gas Operator | Apr 2020 |
| 497 | Bell Supply Co | Kilgore, TX 75662 | Oil & Gas Operator | Jan 2013 |
| 498 | Bellco Materials Inc | Fayetteville, AR 72703 | Oil Operator | Mar 2015 |
| 499 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 500 | Belnorth Petroleum Corporation | Midland, TX 79701 | Oil & Gas Operator | Feb 1991 |