| Fighter | Record | Last Bout |
|---|---|---|
| Bill Algeo | 18-9-0 | 2024-07-20 |
| Bill Mahood | 20-7-1 (1 NC) | 2005-06-04 |
| Billy Elekana | 10-2-0 | 2026-01-31 |
| Billy Miles | 2-2-0 | 2007-12-08 |
| Billy Quarantillo | 18-8-0 | 2026-08-08 |
| Billy Ray Goff | 9-5-0 | 2026-08-08 |
| Blagoy Ivanov | 19-6-0 (1 NC) | 2023-07-01 |
| Blake Bilder | 8-2-1 | 2024-02-03 |
| Blood Diamond | 3-3-0 | 2023-09-09 |
| Bo Nickal | 9-1-0 | 2026-06-14 |
| Bob Cook | 5-0-0 | 2000-03-10 |
| Bob Gilstrap | 5-7-0 | 1998-05-15 |
| Bobby Hoffman | 36-10-1 (2 NC) | 2001-11-02 |
| Bobby Moffett | 13-5-0 (1 NC) | 2019-08-10 |
| Bobby Nash | 8-4-0 | 2017-11-25 |
| Bobby Southworth | 10-6-0 (1 NC) | 2005-04-09 |
| Bobby Voelker | 19-13-0 | 2014-06-07 |
| Bogdan Grad | 16-4-0 | 2026-08-01 |
| Bogdan Guskov | 18-4-1 | 2026-07-25 |
| Bojan Mihajlovic | 10-6-0 | 2017-09-02 |
| Bojan Velickovic | 15-6-1 | 2017-11-18 |
| Bolaji Oki | 10-4-0 | 2026-03-14 |
| Borislav Nikolic | 17-2-0 | 2026-08-01 |
| Boston Salmon | 6-3-0 | 2019-10-18 |
| Brad Blackburn | 18-13-1 (1 NC) | 2010-04-10 |
| Brad Gumm | 10-6-1 (1 NC) | 2000-09-22 |
| Brad Imes | 13-7-0 | 2007-04-07 |
| Brad Katona | 16-5-0 | 2025-05-10 |
| Brad Kohler | 12-15-0 | 1999-09-24 |
| Brad Morris | 10-6-0 | 2008-09-17 |
| Brad Pickett | 25-14-0 | 2017-03-18 |
| Brad Riddell | 10-4-0 | 2022-11-12 |
| Brad Scott | 11-6-0 | 2018-05-27 |
| Brad Tavares | 21-13-0 | 2026-03-14 |
| Brady Hiestand | 9-2-0 | 2026-09-26 |
| Branden Lee Hinkle | 17-11-0 (1 NC) | 2006-06-28 |
| Brando Pericic | 7-1-0 | 2026-05-02 |
| Brandon Davis | 14-10-0 | 2022-10-15 |
| Brandon Jenkins | 15-9-0 | 2022-04-16 |
| Brandon Melendez | 25-25-0 | 2007-06-23 |
| Brandon Moreno | 23-10-2 | 2026-09-12 |
| Brandon Royval | 18-9-0 | 2026-07-11 |
| Brandon Thatch | 11-5-0 | 2016-12-30 |
| Brandon Vera | 15-7-0 (1 NC) | 2013-08-31 |
| Brandon Wolff | 7-5-0 | 2009-05-23 |
| Braxton Smith | 5-2-0 | 2023-05-06 |
| Brendan Allen | 27-7-0 | 2026-10-10 |
| Brendan Loughnane | 17-3-0 | 2012-12-14 |
| Brendan O'Reilly | 6-3-0 (1 NC) | 2016-12-03 |
| Brendan Schaub | 10-5-0 | 2014-12-06 |