| 501 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 502 | Belnorth Petroleum Corporation | Midland, TX 79701 | Oil & Gas Operator | Feb 1991 |
| 503 | Below Ground Level LLC | Sand Springs, OK 74063 | Oil & Gas Operator | Jul 2025 |
| 504 | Belport Oil, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2025 |
| 505 | Bench Oil | Duncan, OK 73533 | Oil Operator | Apr 2014 |
| 506 | Benchmark Crude Inc | Tulsa, OK 74105-5920 | Oil & Gas Operator | Sep 2015 |
| 507 | Benchmark Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 508 | Benchmark Resources Group LTD | Sapulpa, OK 74066-3238 | Oil & Gas Operator | Dec 2000 |
| 509 | Bend Petroleum Corp. | Muenster, TX 76252 | Oil & Gas Operator | Nov 2023 |
| 510 | Benfer Theodore M | Tupelo, OK 74572-5096 | Oil Operator | Apr 2025 |
| 511 | Benn Oil & Gas | Perryton, TX 79070 | Oil & Gas Operator | Jun 2005 |
| 512 | Bennd Oil Company | Adams, TN 37010-8002 | Oil Operator | Apr 2025 |
| 513 | Benson Mineral Group Inc | Denver, CO 80202 | Oil & Gas Operator | Apr 2022 |
| 514 | Benson Operating LLC | The Colony, TX 75056-3578 | Oil & Gas Operator | Apr 2025 |
| 515 | Bent Tree Energy Resource Inc | Shawnee, OK 74802 | Oil & Gas Operator | Sep 2014 |
| 516 | Bent Twig Operating Corporation | Oklahoma City, OK 73143-4716 | Oil & Gas Operator | Mar 2015 |
| 517 | Bentley & Laing | Wichita Falls, TX 76302 | Oil & Gas Operator | Feb 2002 |
| 518 | Bentley Oil & Gas Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2025 |
| 519 | Benton Energy Corporation | | Oil & Gas Operator | Mar 2024 |
| 520 | Benton Oil & Gas Co | Oxnard, CA 93030 | Oil Operator | Nov 1998 |
| 521 | Ber-Mor Oil Inc | Perry, OK 73077-1212 | Oil & Gas Operator | Jul 2015 |
| 522 | Beren Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jul 2025 |
| 523 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Jun 2025 |
| 524 | Berexco LLC | Wichita, KS 67206 | Oil & Gas Operator | Jul 2025 |
| 525 | Bergen Floyd | Norman, OK 73072 | Oil & Gas Operator | Mar 2015 |
| 526 | Berger Oil Company | Edmond, OK 73013-2044 | Oil Operator | Mar 2015 |
| 527 | Berry Operating Company | Stillwater, OK 74076-0518 | Oil & Gas Operator | Dec 2016 |
| 528 | Berry, Thomas N. & Co. | Stillwater, OK 74076 | Oil & Gas Operator | Feb 2012 |
| 529 | Bertschinger Oil Company | Oklahoma City, OK 73116-6534 | Oil & Gas Operator | Nov 2015 |
| 530 | Bestmark Production Inc | Yukon, OK 73099 | Oil & Gas Operator | Mar 2011 |
| 531 | Beta Oil Company Inc | Oklahoma City, OK 73157-2958 | Oil & Gas Operator | Dec 2022 |
| 532 | Beta Operating Company, LLC | Houston, TX 77210 | Oil & Gas Operator | Apr 2020 |
| 533 | Bets Oil & Gas | Pawhuska, OK 74056 | Oil & Gas Operator | Nov 2018 |
| 534 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 535 | Betty L Wood Dba Able Oil Company | Morris, OK 74445-2303 | Oil & Gas Operator | Mar 2025 |
| 536 | Beveled Edge Productions LLC | Norman, OK 73069-4941 | Oil Operator | Dec 2019 |
| 537 | Bevo Production Co. | Amarillo, TX 79101 | Oil & Gas Operator | Dec 2014 |
| 538 | Bez Resources LLC | Perry, OK 73077-2204 | Oil & Gas Operator | Mar 2023 |
| 539 | BFS Petroleum Company | Skiatook, OK 74070-3998 | Oil & Gas Operator | Jan 2004 |
| 540 | Bgi Resources LLC | | Oil & Gas Operator | Apr 2025 |
| 541 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 542 | BHP Petroleum Company Inc | Houston, TX 77057 | Oil & Gas Operator | Jun 2016 |
| 543 | Bickham G C Inc | Ada, OK 74820-8304 | Oil Operator | Jun 2017 |
| 544 | Biddy Audrian Q | Okemah, OK 74859 | Oil & Gas Operator | Aug 2013 |
| 545 | Biffle SR Bob | Duncan, OK 73533 | Oil & Gas Operator | Nov 1998 |
| 546 | Big Bend Oil Co | Hominy, OK 74035 | Oil & Gas Operator | Jan 2025 |
| 547 | Big Creek Energy LLC | Kingfisher, OK 73750-3102 | Oil & Gas Operator | May 2025 |
| 548 | Big Four Leasing & Operating Inc | Cushing, OK 74023 | Oil & Gas Operator | Apr 2025 |
| 549 | Big Four Petroleum Company | Cushing, OK 74023 | Oil & Gas Operator | Nov 2004 |
| 550 | Big Horn Oil Co., Inc. | Great Bend, KS 67530 | Oil & Gas Operator | May 2013 |
| 551 | Big J Tank Truck Service Inc | Perry, OK 73077-1238 | Oil Operator | Apr 2014 |
| 552 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 553 | Big Sky Exploration LLC | Dana Point, CA 92629-2889 | Oil Operator | Apr 2020 |
| 554 | Big Sky Oil Company | Nowata, OK 74048-0187 | Oil & Gas Operator | Mar 2015 |
| 555 | Big Sky Production Co Inc | Perry, OK 73077 | Oil & Gas Operator | May 2006 |
| 556 | Biggs, Laura L | | Oil & Gas Operator | Jul 2019 |
| 557 | Bilbe Operating Company | Sapulpa, OK 74066 | Oil & Gas Operator | Apr 2003 |
| 558 | Bill Weems Oil LLC | Seminole, OK 74868 | Oil & Gas Operator | Apr 2025 |
| 559 | Billy Jack Sharber Operating LLC | Seminole, OK 74868 | Oil & Gas Operator | Apr 2025 |
| 560 | Billy Judd Investment Company | Ardmore, OK 73401-1095 | Oil & Gas Operator | Apr 2025 |
| 561 | Billy Matthews Production LLC | Dover, OK 73734 | Oil & Gas Operator | Apr 2025 |
| 562 | Binger Operations LLC | Houston, TX 77057-3187 | Oil & Gas Operator | May 2025 |
| 563 | Bingham Bill S | Claremore, OK 74017 | Oil Operator | Jul 1998 |
| 564 | Bingman J Brian | Sapulpa, OK 74066-1108 | Oil & Gas Operator | May 2013 |
| 565 | Bingman Lois Lemons | Healdton, OK 73438-0328 | Oil Operator | Sep 1996 |
| 566 | Bird Creek Oil Company | Tulsa, OK 74126 | Oil & Gas Operator | Dec 2000 |
| 567 | Bird Creek Resources Inc | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2022 |
| 568 | Bird Oil & Gas Inc | Yukon, OK 73099-2827 | Oil & Gas Operator | Jan 2023 |
| 569 | Birks Robert L Dba Birks Production | Asher, OK 74826-9633 | Oil & Gas Operator | Apr 2025 |
| 570 | Bishop 3B Production LLC | Dewey, OK 74029-2140 | Oil Operator | Apr 2024 |
| 571 | Bison Energy Corporation | Wichita, KS 67206 | Oil & Gas Operator | Mar 2022 |
| 572 | Bison Exploration Drilling 1 LP | Dallas, TX 75205-3483 | Oil & Gas Operator | Nov 2015 |
| 573 | Bison Petroleum Inc | Tulsa, OK 74137 | Oil & Gas Operator | Nov 2004 |
| 574 | BK Exploration Corp | Tulsa, OK 74152-009 | Oil & Gas Operator | Mar 2021 |
| 575 | BKR Operating LLC | Ripley, OK 74062-6524 | Oil & Gas Operator | Apr 2025 |
| 576 | Black Aubrey C | Dallas, TX 75206 | Oil & Gas Operator | Nov 2002 |
| 577 | Black Bear Properties LLC | Oklahoma City, OK 73156-1904 | Oil & Gas Operator | Feb 2013 |
| 578 | Black Creek Exploration LLC | Healdton, OK 73438 | Oil & Gas Operator | May 2025 |
| 579 | Black Dome Energy Corporation | Golden, CO 80401 | Oil & Gas Operator | Dec 2019 |
| 580 | Black Dot Oil Inc | Skiatook, OK 74070 | Oil & Gas Operator | Apr 2025 |
| 581 | Black Energy LLC | Okmulgee, OK 74447 | Oil Operator | Apr 2025 |
| 582 | Black Gold Energy LLC | Jenks, OK 74037 | Oil Operator | Jun 2024 |
| 583 | Black Gold Oil Company | Duncan, OK 73533-1581 | Oil & Gas Operator | Apr 2025 |
| 584 | Black Jewel Resources LTD Co | Berryville, AR 72616-0538 | Oil & Gas Operator | Dec 2014 |
| 585 | Black Lava Operating LLC | | Oil & Gas Operator | Apr 2025 |
| 586 | Black Mesa Energy LLC | Tulsa, OK 74103-4334 | Oil & Gas Operator | May 2025 |
| 587 | Black Wendell D | Atwood, OK 74827-9706 | Oil & Gas Operator | Jan 2009 |
| 588 | Blackbeard Operating East LLC | Midland, TX 79701-4532 | Oil & Gas Operator | Dec 2020 |
| 589 | Blackbeard Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jul 2025 |
| 590 | Blackberry Oil Company | Jennings, OK 74038-0068 | Oil & Gas Operator | Dec 2002 |
| 591 | Blackcat Oil Company | Glencoe, OK 74032 | Oil & Gas Operator | May 2025 |
| 592 | Blackfire Operating LLC | Oklahoma City, OK 73116-4223 | Oil & Gas Operator | May 2025 |
| 593 | Blackhawk Oil Co | Ottawa, KS 66067 | Oil & Gas Operator | Jan 2011 |
| 594 | Blackjack Oak Production,LLC | | Oil Operator | Apr 2025 |
| 595 | Blackjack Oil & Gas, Inc. | Hennessey, OK 73742 | Oil & Gas Operator | Jul 2025 |
| 596 | Blackjack Oil LTD | Denver, CO 80223 | Oil Operator | May 1996 |
| 597 | Blackjack Supply Company | Edmond, OK 73013-1144 | Oil & Gas Operator | May 2012 |
| 598 | Blackrock Energy LLC | Wagoner, OK 74467 | Oil Operator | Apr 2025 |
| 599 | Blackstock Petroleum Co | Tulsa, OK 74136-4940 | Oil & Gas Operator | Oct 1994 |
| 600 | Blackwell Exploration & Development LLC | Dallas, TX 75252-5637 | Oil & Gas Operator | Jan 2024 |