| Fighter | Record | Last Bout |
|---|---|---|
| Aaron Brink | 26-26-0 (2 NC) | 2000-11-17 |
| Alan Baudot | 8-3-0 (2 NC) | 2022-06-25 |
| Alan Belcher | 18-8-0 | 2013-04-27 |
| Alexandre Barros | 22-11-0 | 2009-01-17 |
| Ali Bagautinov | 15-6-0 | 2016-11-19 |
| Allen Berube | 4-3-0 | 2007-06-23 |
| Amaury Bitetti | 5-2-0 | 2000-06-09 |
| Anthony Birchak | 16-8-0 | 2021-04-17 |
| Antonio Banuelos | 20-11-1 | 2011-02-05 |
| Antonio Braga Neto | 9-3-0 (1 NC) | 2017-12-09 |
| Ariel Beck | 4-5-0 | 2017-12-01 |
| Arjan Bhullar | 9-1-0 | 2019-05-04 |
| Austin Bashi | 14-2-0 | 2026-07-18 |
| Azamat Bekoev | 20-5-0 | 2026-04-04 |
| BJ Penn | 16-14-2 | 2019-05-11 |
| Baergeng Jieleyisi | 18-7-0 | 2024-11-23 |
| Baisangur Susurkaev | 12-0-0 | 2026-05-09 |
| Barb Honchak | 10-4-0 | 2018-07-06 |
| Bart Palaszewski | 36-17-0 | 2013-04-13 |
| Bartosz Fabinski | 15-5-0 | 2021-04-17 |
| Bas Rutten | 28-4-1 | 1999-05-07 |
| Bassil Hafez | 9-4-1 | 2024-11-16 |
| Batgerel Danaa | 12-5-0 | 2023-04-22 |
| Bea Malecki | 4-1-0 | 2021-08-21 |
| Bec Rawlings | 7-8-0 | 2018-04-07 |
| Bekzat Almakhan | 12-4-0 | 2026-06-27 |
| Belal Muhammad | 24-6-0 (1 NC) | 2026-06-06 |
| Ben Alloway | 18-8-0 | 2013-08-28 |
| Ben Askren | 19-2-0 (1 NC) | 2019-10-26 |
| Ben Earwood | 12-3-0 | 2000-11-17 |
| Ben Johnston | 5-2-0 | 2026-05-02 |
| Ben Nguyen | 16-8-0 | 2018-12-01 |
| Ben Rothwell | 39-14-0 | 2021-11-13 |
| Ben Saunders | 22-13-2 | 2019-12-14 |
| Ben Sosoli | 7-3-0 (2 NC) | 2020-02-22 |
| Ben Wall | 8-7-1 | 2014-05-10 |
| Benardo Sopaj | 13-3-0 | 2026-10-03 |
| Beneil Dariush | 23-8-1 | 2026-05-02 |
| Benito Lopez | 10-2-0 | 2022-11-05 |
| Benji Radach | 21-7-0 (1 NC) | 2002-09-27 |
| Benoit Saint Denis | 17-4-0 (1 NC) | 2026-07-11 |
| Benson Henderson | 24-7-0 | 2015-11-28 |
| Bentley Syler | 5-1-0 | 2015-03-21 |
| Bernardo Magalhaes | 13-4-0 | 2012-06-08 |
| Besam Yousef | 7-4-0 | 2013-04-06 |
| Bethe Correia | 11-6-1 | 2021-10-02 |
| Bevon Lewis | 7-3-0 | 2020-11-07 |
| Bharat Kandare | 5-3-0 | 2017-11-25 |
| Bia Mesquita | 8-0-0 | 2026-06-20 |
| Bilal Hasan | 10-0-0 (1 NC) | 2026-08-29 |