| 401 | Bengal Oil & Gas, Inc. | | Gas Operator | Mar 2006 |
| 402 | Benton Oil & Gas Company Of La | | Oil & Gas Operator | Apr 1997 |
| 403 | Bepco, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2008 |
| 404 | Bering Operating Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | May 2001 |
| 405 | Berkshire Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 406 | Bert & Glen Loe | | Oil Operator | Jul 1979 |
| 407 | Bert Fields, Jr. | | Oil & Gas Operator | Nov 1986 |
| 408 | Beta Oil Inc | | Oil Operator | Feb 1986 |
| 409 | Beta Operating, Inc | | Oil & Gas Operator | May 2001 |
| 410 | Bethlan Production Corporation | | Oil & Gas Operator | Dec 1994 |
| 411 | Betsy Production Company, Inc. | Magnolia, AR 71753 | Oil & Gas Operator | Mar 2025 |
| 412 | Beusa Energy, Inc. | Spring, TX 77380 | Oil & Gas Operator | Apr 2011 |
| 413 | Beusa Energy, LLC | | Oil & Gas Operator | Nov 2017 |
| 414 | Bev Exploration, Inc. | | Oil Operator | Jun 1985 |
| 415 | BHB Oil, Inc | | Oil & Gas Operator | Dec 2024 |
| 416 | BHP Billiton Petro (KCS Resources), LLC | | Oil & Gas Operator | Jul 2019 |
| 417 | BHP Billiton Petro (Txla Operating) Co. | | Gas Operator | Jul 2019 |
| 418 | BHP Billiton Petro (WSF Operating), Inc. | | Oil & Gas Operator | Jul 2019 |
| 419 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 420 | BHP Petroleum Company Inc | Houston, TX 77057 | Oil & Gas Operator | Jun 2016 |
| 421 | BHP Petroleum, Inc. | | Oil & Gas Operator | Aug 1985 |
| 422 | Biedenharn Et Al | | Gas Operator | Nov 1996 |
| 423 | Big Creek Operating, Inc. | | Oil & Gas Operator | Jan 1991 |
| 424 | Big G Exploration, Inc. | | Oil Operator | Mar 1988 |
| 425 | Big Island Operating Corp. | | Oil & Gas Operator | Aug 1988 |
| 426 | Big Joe Operating Company, Inc. | | Oil & Gas Operator | May 2017 |
| 427 | Big M Oil Company | | Oil & Gas Operator | Jan 2025 |
| 428 | Big Pine Petroleum Inc. | | Oil & Gas Operator | Dec 2024 |
| 429 | Big River Oil Field Services, LLC | | Oil Operator | Mar 2017 |
| 430 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 431 | Bigfoot Energy Services LLC | Carthage, TX 75633 | Oil & Gas Operator | Aug 2024 |
| 432 | Biggs Resources, Inc. | | Oil Operator | Apr 1984 |
| 433 | Biglane Operating Company | | Oil & Gas Operator | Mar 2025 |
| 434 | Bike Oil & Gas Company, Inc. | | Oil & Gas Operator | Aug 2002 |
| 435 | Bileta Corporation | | Oil & Gas Operator | Aug 2010 |
| 436 | Bill Foster | | Oil Operator | Dec 2024 |
| 437 | Bill Gary | | Gas Operator | Jul 1995 |
| 438 | Bill Tarver | | Oil Operator | Nov 2004 |
| 439 | Billingsley Engineering Co. | | Oil & Gas Operator | May 1994 |
| 440 | Billy A. Poisso | | Oil & Gas Operator | Apr 2023 |
| 441 | Billy E. Bayles | | Oil & Gas Operator | Apr 1998 |
| 442 | Billy P. Bullock-Production | | Oil Operator | Jan 1991 |
| 443 | Billy Young | | Oil Operator | Aug 1989 |
| 444 | Bintliff Props. LTD. PRTNRSHP. | | Oil & Gas Operator | Dec 1987 |
| 445 | Bishop Petroleum Inc. | Houston, TX 77007 | Oil & Gas Operator | May 2025 |
| 446 | Bison Energy Partners, LLC | | Oil & Gas Operator | Jan 2025 |
| 447 | BJT Properties Of Lasalle, LLC | | Oil Operator | Dec 2024 |
| 448 | Bke-A, L L C | | Oil & Gas Operator | Jun 1999 |
| 449 | Bke-Theall, LLC | | Oil & Gas Operator | Feb 2000 |
| 450 | BKV Ventures, LLC | | Oil & Gas Operator | Nov 2020 |
| 451 | Black Bayou Gas Processing, Inc. | | Oil Operator | Dec 2024 |
| 452 | Black Bayou Gas Systems, Inc. | | Oil Operator | Feb 2009 |
| 453 | Black Bayou Management Co Inc. | | Oil & Gas Operator | Aug 1980 |
| 454 | Black Bayou Operating, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2025 |
| 455 | Black Bayou Petroleum | | Oil Operator | Jul 1999 |
| 456 | Black Bayou Resources, Inc. | | Oil & Gas Operator | Jun 1992 |
| 457 | Black Bear Midstream LLC | | Oil Operator | Jan 2025 |
| 458 | Black Diamond Energy, LLC | | Oil & Gas Operator | Oct 2008 |
| 459 | Black Diamond Production Co. | | Oil & Gas Operator | Mar 2021 |
| 460 | Black Elk Energy Offshore Operations LLC | | Oil & Gas Operator | Jun 2016 |
| 461 | Black Gold Production Company | | Oil & Gas Operator | Feb 1998 |
| 462 | Black Gold Resources LLC | Houston, TX 77056 | Oil Operator | Sep 2013 |
| 463 | Black Hawk Resources | | Oil & Gas Operator | Dec 1984 |
| 464 | Black Jack Oil Co Inc | Holliday, TX 76366 | Oil & Gas Operator | Feb 2025 |
| 465 | Black Pearl Exploration, L.L.C. | Houston, TX 77095 | Oil & Gas Operator | May 2015 |
| 466 | Black Pool Energy, LP | Houston, TX 77070 | Oil & Gas Operator | Jul 2024 |
| 467 | Black Stone Oil Company | Dallas, TX 75244 | Oil & Gas Operator | Feb 1997 |
| 468 | Blackbeard Operating East LLC | Midland, TX 79701-4532 | Oil & Gas Operator | Dec 2020 |
| 469 | Blackbrush O & G, LLC | San Antonio, TX 78259 | Oil & Gas Operator | May 2025 |
| 470 | Blackhorse Energy, LLC Of Texas | | Oil Operator | Jan 2025 |
| 471 | Blackjack Oil, Inc. | Las Vegas, NV 89128 | Oil & Gas Operator | Nov 2019 |
| 472 | Blackjack Operating L. L. C. | Schertz, TX 78154 | Oil & Gas Operator | May 2025 |
| 473 | Blakely Land & Exploration Co. | | Oil & Gas Operator | Apr 1991 |
| 474 | Blanco Oil Co. | San Antonio, TX 78230 | Oil & Gas Operator | Feb 2004 |
| 475 | Blanco Oil Co., Etal | | Oil Operator | Aug 1985 |
| 476 | Bligh Petroleum, Inc. | | Oil & Gas Operator | Jun 2004 |
| 477 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | May 2025 |
| 478 | Block T Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 479 | Blocker Exploration Company | | Oil & Gas Operator | Apr 1983 |
| 480 | Blue Bird Oil & Gas Prod. Co. | | Gas Operator | Dec 2007 |
| 481 | Blue Creek Resources, Inc. | | Oil & Gas Operator | May 1990 |
| 482 | Blue Diamond Drilling, Inc. | | Oil Operator | Nov 1995 |
| 483 | Blue Dome Operating, LLC | Tulsa, OK 74119 | Gas Operator | May 2025 |
| 484 | Blue Mill Farms, Inc. | | Oil & Gas Operator | Apr 1992 |
| 485 | Blue Ridge Group, Inc. | Bowling Green, KY 42101 | Oil & Gas Operator | Dec 2023 |
| 486 | BMR Oil & Gas, Inc. | | Oil & Gas Operator | Dec 2024 |
| 487 | Bo Luvan | | Oil & Gas Operator | Oct 2003 |
| 488 | Bob Bertolet | | Oil & Gas Operator | Dec 2001 |
| 489 | Bob Bertolet, J Dale IV,Munoco | | Oil Operator | Sep 1991 |
| 490 | Bob L. Herd | | Oil & Gas Operator | Dec 1979 |
| 491 | Bob L. Herd & Petrofunds | | Oil & Gas Operator | Mar 1984 |
| 492 | Bob R. Hyde Co. | | Oil Operator | May 1986 |
| 493 | Bob Sibley | | Oil & Gas Operator | Jan 2025 |
| 494 | Bobby G. Martin Oil & Gas Co. | | Oil Operator | Nov 1990 |
| 495 | Bobby Jenny | | Gas Operator | Dec 2001 |
| 496 | Bobby Procell | | Oil & Gas Operator | Feb 2001 |
| 497 | Bobby R. Hale | | Oil Operator | Dec 1992 |
| 498 | Boca Production Inc | | Oil & Gas Operator | Jun 2002 |
| 499 | Bodcaw Company | | Oil & Gas Operator | Oct 1979 |
| 500 | Bodcaw Company Et Al | | Oil & Gas Operator | Oct 1979 |