| 401 | Brittany Energy LLC | San Antonio, TX 78209 | Oil & Gas Operator | May 2019 |
| 402 | Brock Exploration Corp | New Orleans, LA 70112-1707 | Oil & Gas Operator | Jan 1999 |
| 403 | Brock Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2019 |
| 404 | Brock Resources, Inc. | New Orleans, LA 70112 | Oil & Gas Operator | Nov 1998 |
| 405 | Brock SR Kirby L | Stillwater, OK 74074-7206 | Oil Operator | Mar 2013 |
| 406 | Brocon Inc | Healdton, OK 73438 | Oil & Gas Operator | May 2020 |
| 407 | Broken Arrow Petroleum Company | | Gas Operator | May 2013 |
| 408 | Bromar Oil Company | Fairview, OK 73737-0006 | Oil & Gas Operator | Apr 2014 |
| 409 | Bronco Petroleum Company | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2014 |
| 410 | Brooken Production Company LLC | Tulsa, OK 74170-1354 | Gas Operator | Jul 2025 |
| 411 | Brooks E L | Edmond, OK 73034-6882 | Oil & Gas Operator | May 2009 |
| 412 | Brooks Energy Company | Tulsa, OK 74114-3304 | Oil & Gas Operator | Jul 2008 |
| 413 | Brooks Oil & Gas Inc | Sun Prairie, WI 53590 | Oil & Gas Operator | May 2013 |
| 414 | Brooks Oil Company | Kilgore, TX 75662 | Oil & Gas Operator | Dec 2025 |
| 415 | Brookwood Oil Company | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2002 |
| 416 | Brothers Production Company Inc. | Midland, TX 79708 | Oil & Gas Operator | Dec 2025 |
| 417 | Browder & Ratcliff | Dewey, OK 74029 | Oil Operator | Aug 2000 |
| 418 | Brower Oil & Gas Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 419 | Brower, Robert C. | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2025 |
| 420 | Brown & Borelli, Inc. | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2025 |
| 421 | Brown & Brown Of Pawnee Inc | Pawnee, OK 74058-9702 | Oil Operator | Jan 2013 |
| 422 | Brown & Brown Production Inc | Ratliff City, OK 73481 | Oil & Gas Operator | Aug 2025 |
| 423 | Brown Alan L | Pawhuska, OK 74056 | Oil & Gas Operator | Aug 2025 |
| 424 | Brown B J | Tulsa, OK 74133 | Gas Operator | Jan 2007 |
| 425 | Brown Curt Operating Company | Tulsa, OK 74105 | Oil Operator | Nov 1998 |
| 426 | Brown Don J | Cleveland, OK 74020 | Oil & Gas Operator | Mar 2014 |
| 427 | Brown Dorla M Trust | Tulsa, OK 74133-2926 | Oil & Gas Operator | Dec 2021 |
| 428 | Brown Drilling Company | Mounds, OK 74047-4263 | Oil & Gas Operator | Oct 2020 |
| 429 | Brown Gary E | Tecumseh, OK 74873-0355 | Oil & Gas Operator | Aug 2015 |
| 430 | Brown Jeff J Dba Brown Service Co | Enid, OK 73701 | Oil & Gas Operator | Aug 2025 |
| 431 | Brown Jr Roy M | Sasakwa, OK 74867 | Oil Operator | Nov 2016 |
| 432 | Brown L C Company | Ada, OK 74820-7916 | Oil & Gas Operator | Nov 2021 |
| 433 | Brown L S | Hominy, OK 74035 | Oil & Gas Operator | Sep 2024 |
| 434 | Brown Tank & Equipment Inc | Blackwell, OK 74631-5600 | Oil Operator | Oct 2000 |
| 435 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 436 | Brown Vernon L & Bonita | Cleveland, OK 74020-4426 | Oil & Gas Operator | Apr 2009 |
| 437 | Brown, George R. Partnership,The | Houston, TX 77002 | Oil & Gas Operator | May 2006 |
| 438 | Brown, Jo Ann Dahl | | Oil & Gas Operator | Jun 2004 |
| 439 | Brown, Perry B | | Oil & Gas Operator | Apr 2024 |
| 440 | Browning Oil Company, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 441 | Bruce Weldon | Lawton, OK 73501-5707 | Oil & Gas Operator | Mar 2000 |
| 442 | Brundred Petroleum Inc | | Oil & Gas Operator | Nov 1992 |
| 443 | Brunsteter Dick Oil & Gas Inc | Alva, OK 73717-0068 | Oil & Gas Operator | Jul 2006 |
| 444 | Bryant D G And Company | Midlothian, TX 76065-3628 | Oil & Gas Operator | Jul 2025 |
| 445 | Bryant Expl And Prod Co Inc | Elk City, OK 73648-0827 | Oil & Gas Operator | Apr 2014 |
| 446 | Bryant Joe | Helena, OK 73741 | Oil & Gas Operator | Apr 1998 |
| 447 | BS&W Solutions LLC | | Oil Operator | Jun 2014 |
| 448 | Bso Inc | Cleveland, OK 74020 | Oil & Gas Operator | Sep 2025 |
| 449 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 450 | Buccaneer Petroleum Inc | Tonkawa, OK 74653-2513 | Oil & Gas Operator | Jan 2013 |
| 451 | Buchanan Wayman W | San Antonio, TX 78212 | Oil & Gas Operator | Sep 1990 |
| 452 | Buck Creek Associates | Bartlesville, OK 74006 | Oil & Gas Operator | May 2013 |
| 453 | Buck Creek Associates LLC | Bartlesville, OK 74005-2091 | Oil Operator | Sep 2009 |
| 454 | Buck Enterprises LLC | Oklahoma City, OK 73150-6111 | Oil Operator | Aug 2025 |
| 455 | Buck Exploration | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 1991 |
| 456 | Buck Production Co LLC | Bristow, OK 74010 | Oil & Gas Operator | Sep 2023 |
| 457 | Bud Oil, Inc. | Duncan, OK 73534 | Oil & Gas Operator | Dec 2025 |
| 458 | Buds Oil Company | Sperry, OK 74073 | Oil & Gas Operator | Dec 2025 |
| 459 | Buffalo Oil & Gas LLC | Oxford, KS 67119 | Oil & Gas Operator | Jun 2025 |
| 460 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 2025 |
| 461 | Bulinski Richard | Wetumka, OK 74883-0056 | Oil & Gas Operator | Jan 2004 |
| 462 | Bull Ring Energy LLC | Oklahoma City, OK 73118 | Gas Operator | Aug 2025 |
| 463 | Bullard Bros Production Co Inc | Comanche, OK 73529-0637 | Oil Operator | Mar 2015 |
| 464 | Bullard Don W | Ardmore, OK 73401-3646 | Oil & Gas Operator | Dec 2019 |
| 465 | Bullard Oil Company LLC | Tuttle, OK 73089-8375 | Oil Operator | Jul 2025 |
| 466 | Bullards Oilfield Service Inc | Ardmore, OK 73401-3646 | Oil Operator | Sep 1999 |
| 467 | Bulldog Disposal Inc | Laverne, OK 73848 | Oil Operator | Apr 2014 |
| 468 | Bulldog Operating Company LLC | Shreveport, LA 71101-3680 | Oil & Gas Operator | Jun 2015 |
| 469 | Bulldog Production Inc | Seminole, OK 74868 | Oil Operator | Nov 2024 |
| 470 | Bullseye Operating LLC | Bartlesville, OK 74005 | Oil & Gas Operator | Aug 2025 |
| 471 | Bumblebee Energy LLC | Oklahoma City, OK 73120 | Oil Operator | Aug 2025 |
| 472 | Buntin Ronnie | Maramec, OK 74045-4500 | Oil & Gas Operator | Sep 2019 |
| 473 | Bunyard Jerry L | Stroud, OK 74079 | Oil & Gas Operator | Oct 2024 |
| 474 | Burchfield Lawrence & VIrginia | Morris, OK 74445-2814 | Gas Operator | Aug 2018 |
| 475 | Burchfield Margaret S Dba Nu-Hope Oil Company | Earlsboro, OK 74840 | Oil & Gas Operator | Aug 2025 |
| 476 | Burk George E | Mannford, OK 74044-0593 | Oil & Gas Operator | Oct 2015 |
| 477 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 478 | Burkan Oil Company | Tulsa, OK 74137 | Oil & Gas Operator | Dec 1995 |
| 479 | Burkhart Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2002 |
| 480 | Burleson Production LLC | Frederick, OK 73542 | Oil & Gas Operator | Aug 2025 |
| 481 | Burlington Oil Company | Ponca City, OK 74602-1304 | Oil & Gas Operator | May 2007 |
| 482 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Dec 2025 |
| 483 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 484 | Burns Eugene | Davis, OK 73030-3112 | Oil Operator | Mar 2006 |
| 485 | Burrows Alfred | Copan, OK 74022 | Oil & Gas Operator | May 2021 |
| 486 | Burrows, Dewey | | Oil & Gas Operator | Aug 2025 |
| 487 | Burt Esther M | Sperry, OK 74073 | Oil Operator | Apr 2025 |
| 488 | Burt James & Charles Maybee | Sperry, OK 74073-8001 | Oil & Gas Operator | Nov 2014 |
| 489 | Burton Oil Properties | Ratliff City, OK 73081 | Oil & Gas Operator | Aug 2025 |
| 490 | Busey Naman | Elmore City, OK 73433-9583 | Oil & Gas Operator | Jul 2025 |
| 491 | Butkin Oil Company | Duncan, OK 73534-2090 | Oil & Gas Operator | Sep 2021 |
| 492 | Butkin Oil Company LLC | Duncan, OK 73533 | Oil & Gas Operator | Mar 2023 |
| 493 | Butler & Haseloff | Vernon, TX 76384 | Oil Operator | Jul 1993 |
| 494 | Butler B F | Hobart, OK 73651 | Oil Operator | Apr 2014 |
| 495 | Butler Petroleum Corp | Norman, OK 73069-7111 | Oil & Gas Operator | Dec 1998 |
| 496 | Butler Petroleum LLC | Van Alstyne, TX 75495 | Oil Operator | May 2020 |
| 497 | Butler, Cecil D | | Oil & Gas Operator | Aug 2025 |
| 498 | Butte Oil And Gas Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | Aug 2025 |
| 499 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |
| 500 | Buttonwood Petroleum Inc | Tulsa, OK 74136-4234 | Oil & Gas Operator | Jan 2014 |