| 501 | Blackwell Operating Company | Houston, TX 77227 | Oil & Gas Operator | Jun 2007 |
| 502 | Blade Oil Co. | Borger, TX 79007 | Oil & Gas Operator | Jun 1994 |
| 503 | Blair Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2011 |
| 504 | Blair Oil Company | Kingfisher, OK 73750-1213 | Oil & Gas Operator | Feb 2025 |
| 505 | Blair, Jack N. | Midland, TX 79702 | Oil & Gas Operator | May 1996 |
| 506 | Blair, R. W. | FT Stockton, TX 79735 | Oil & Gas Operator | Dec 2009 |
| 507 | Blake Oil & Gas Corporation | Midland, TX 79701 | Oil & Gas Operator | May 2004 |
| 508 | Blake Production Company, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2025 |
| 509 | Blakemore, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Dec 2012 |
| 510 | Blakenergy Operating, LLC | Spring, TX 77386 | Oil & Gas Operator | Apr 2025 |
| 511 | Blalack, James William | Schertz, TX 78154 | Oil & Gas Operator | Apr 2025 |
| 512 | Blanco Engineering Inc. | Artesia, NM 88210 | Oil & Gas Operator | Feb 1997 |
| 513 | Blanco Oil Co. | San Antonio, TX 78230 | Oil & Gas Operator | Feb 2004 |
| 514 | Blazer Energy Corp. | Alexandria, VA 22314 | Oil & Gas Operator | Dec 2014 |
| 515 | Blazer Resources, Inc. | Leesburg, TX 75451 | Oil & Gas Operator | Apr 2025 |
| 516 | Bledsco, Inc. | Holliday, TX 76366 | Oil Operator | Feb 2010 |
| 517 | Bledsoe Partners, Inc. | Oklahoma City, OK 73120 | Oil & Gas Operator | Mar 1995 |
| 518 | Bledsoe Petro Corporation | Dallas, TX 75201 | Oil & Gas Operator | Dec 2000 |
| 519 | Bledsoe, R.K. Trust Oil Operator | Jourdanton, TX 78026 | Oil & Gas Operator | Apr 2025 |
| 520 | Blessing Energy, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Apr 2025 |
| 521 | Blevins Production LLC | Jacksboro, TX 76458 | Oil Operator | Apr 2025 |
| 522 | BLM Black Gold Properties, LTD. | Lubbock, TX 79423 | Oil & Gas Operator | Apr 2025 |
| 523 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | Apr 2025 |
| 524 | Block T Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 525 | Bloomer & Associates, Inc. | Lago VIsta, TX 78645 | Oil & Gas Operator | Jul 2002 |
| 526 | Bloxom, John Tom | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 2007 |
| 527 | BLS Production Co., Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2025 |
| 528 | BLS Resources, Inc. | Rosharon, TX 77583 | Oil & Gas Operator | Feb 2001 |
| 529 | Bluco Production Co., Inc. | Austin, TX 78716 | Oil & Gas Operator | Apr 2025 |
| 530 | Blue Creek Inc | Fort Worth, TX 76181 | Oil & Gas Operator | Dec 2002 |
| 531 | Blue Diamond Mountain, LLC | Marble Falls, TX 78654 | Oil Operator | Apr 2025 |
| 532 | Blue Dolphin Production LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2025 |
| 533 | Blue Dome Operating, LLC | Tulsa, OK 74119 | Gas Operator | Apr 2025 |
| 534 | Blue Duck Corporation | Mont Belvieu, TX 77580 | Oil & Gas Operator | Sep 2011 |
| 535 | Blue Marble Resources Op, LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2019 |
| 536 | Blue Oil, Inc. | Burnet, TX 78611 | Oil & Gas Operator | Apr 2025 |
| 537 | Blue Owl Energy LLC | Canada, 00100 | Oil Operator | Apr 2025 |
| 538 | Blue Quail Oil Co. | Midland, TX 79706 | Oil & Gas Operator | Apr 2025 |
| 539 | Blue Ridge Group, Inc. | Bowling Green, KY 42101 | Oil & Gas Operator | Dec 2023 |
| 540 | Blue Ridge Oil & Gas Exp., Inc. | Belleville, MI 48111 | Gas Operator | Jul 1994 |
| 541 | Blue Ridge Operating Company,Inc | Ashland, OR 97520 | Oil & Gas Operator | Oct 1998 |
| 542 | Blue Ridge Operating LLC | Willis, TX 77378 | Oil Operator | Apr 2025 |
| 543 | Blue Ridge Resources, LLC | Midland, TX 79710 | Oil & Gas Operator | Apr 2025 |
| 544 | Blue River Inc. | Abilene, TX 79608 | Oil Operator | Apr 2025 |
| 545 | Blue Sky Industries LLC | Greenville, TX 75403 | Oil Operator | Apr 2025 |
| 546 | Blue Star Energy, Inc. | Shawnee, OK 74802 | Oil & Gas Operator | Apr 2025 |
| 547 | Blue Star Gas Corporation | Norman, OK 73070 | Gas Operator | Apr 1993 |
| 548 | Blue Star Natural Resources, LLC | San Angelo, TX 76906 | Oil & Gas Operator | Apr 2025 |
| 549 | Blue Star Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 550 | Blue Wing Energy, Inc. | Portland, TX 78374 | Oil & Gas Operator | Apr 2025 |
| 551 | Bluebonnet Exploration Company | New Braunfels, TX 78130 | Oil & Gas Operator | Apr 2018 |
| 552 | Bluebonnet Land & Cattle Co. | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 553 | Bluebonnet Oil & Gas | Three Rivers, TX 78071 | Oil & Gas Operator | Apr 2025 |
| 554 | Bluefin Resources LLC | Houston, TX 77079 | Oil & Gas Operator | Oct 2023 |
| 555 | Bluegrass Energy Inc | Houston, TX 77057 | Oil & Gas Operator | Feb 2025 |
| 556 | Bluejay Energy Corporation | Waxahachie, TX 75168 | Oil Operator | Feb 2008 |
| 557 | Bluemark Energy LLC | Tulsa, OK 74120 | Oil & Gas Operator | Jan 2025 |
| 558 | Bluestem Energy Holdings, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2015 |
| 559 | Bluestem Natural Gas LLC | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2025 |
| 560 | Bluestem Resources LLC | Kerrville, TX 78028 | Oil & Gas Operator | Apr 2025 |
| 561 | Bluestone Natural Res. II, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2019 |
| 562 | Bluestone Natural Resources, LLC | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2015 |
| 563 | Bluestone Production Company LP | Tulsa, OK 74105 | Oil & Gas Operator | Jun 2007 |
| 564 | Bluff Creek Petroleum, LLC | Abilene, TX 79603 | Oil & Gas Operator | Apr 2025 |
| 565 | BM Oil Company, LLC | Olney, TX 76374 | Oil Operator | Nov 2021 |
| 566 | BMB Oil Production | Coleman, TX 76834 | Oil & Gas Operator | Feb 2007 |
| 567 | BMBD Enterprises, LLC | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2025 |
| 568 | BMR Operating LLC | Sadler, TX 76264 | Oil Operator | Apr 2025 |
| 569 | BMW Services, LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Apr 2025 |
| 570 | BNP Operating LLC | Corpus Chrsti, TX 78471 | Gas Operator | Jan 2015 |
| 571 | BNP Petroleum Corporation | Corpus Chrsti, TX 78478 | Oil & Gas Operator | Apr 2025 |
| 572 | BNR Operating, LLC | Houston, TX 77269 | Oil & Gas Operator | Apr 2025 |
| 573 | Bo Dunagin Operating, LLC | Merkel, TX 79536 | Oil Operator | Mar 2019 |
| 574 | Bo-MC Resources Corporation | Enid, OK 73702-1765 | Oil & Gas Operator | Apr 2005 |
| 575 | Boaz Energy II Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Apr 2025 |
| 576 | Boaz Energy, LLC | Midland, TX 79710 | Oil & Gas Operator | Mar 2014 |
| 577 | Bob & Ted'S Operating | Lewisville, TX 75067 | Oil & Gas Operator | Apr 1993 |
| 578 | Bob Hughes Oil Company, LLC | San Angelo, TX 76901 | Oil & Gas Operator | Apr 2025 |
| 579 | Bob-Kat Oil Co. | Prairie Lea, TX 78661 | Oil & Gas Operator | Apr 2025 |
| 580 | Bob-Pat Oil & Gas Co., Inc. | Victoria, TX 77902 | Oil & Gas Operator | Jun 2002 |
| 581 | Bobwhite Production Company, Inc | Tulsa, OK 74112 | Oil & Gas Operator | Jan 2025 |
| 582 | Bock & Bacon, Inc. | Houston, TX 77098 | Oil & Gas Operator | May 1999 |
| 583 | Bockhoff, Deborah M. | Olney, TX 76374 | Oil Operator | Apr 2025 |
| 584 | Bodark Oil Company | Ozona, TX 76943 | Oil & Gas Operator | Jul 2009 |
| 585 | Bodden Production | Poth, TX 78147 | Oil & Gas Operator | Apr 2025 |
| 586 | Boester, H. F. | Portland, TX 78374 | Oil & Gas Operator | Aug 2003 |
| 587 | Boge, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2025 |
| 588 | Bogey Oil & Gas | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Sep 2003 |
| 589 | Bohanan Oil Co. | Gordonville, TX 76245 | Oil & Gas Operator | Apr 2025 |
| 590 | Bohner Oil Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1998 |
| 591 | Bois D'Arc Offshore LTD. | Houston, TX 77002 | Oil & Gas Operator | Aug 2008 |
| 592 | Bois D'Arc Operating Corporation | Houston, TX 77040 | Oil & Gas Operator | Jan 2000 |
| 593 | Boland Well Service | Abilene, TX 79601 | Oil & Gas Operator | Jan 2008 |
| 594 | Bold Operating, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | May 2019 |
| 595 | Bolding Energy, LLC | Sterling City, TX 76951 | Oil & Gas Operator | Apr 2025 |
| 596 | Boling Production Company, Inc. | Boling, TX 77420 | Oil & Gas Operator | Apr 2025 |
| 597 | Bollinger Drilling Co. | Del Rio, TX 78840 | Oil Operator | Apr 2025 |
| 598 | Bollman & Bailey | Luling, TX 78648 | Oil & Gas Operator | Oct 2010 |
| 599 | Bomar Oil & Gas, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Dec 2020 |
| 600 | Bomar Operating Co., LC | Bellaire, TX 77401 | Oil & Gas Operator | Apr 2025 |