| Fighter | Record | Last Bout |
|---|---|---|
| Izabela Badurek | 6-3-0 | 2015-04-11 |
| Jacare Souza | 26-10-0 (1 NC) | 2021-05-15 |
| Jack Marshman | 23-10-0 | 2020-10-31 |
| Jack May | 9-3-0 | 2014-08-16 |
| Jack McGlaughlin | 1-4-0 | 1995-07-14 |
| Jack Nilson | 2-6-0 | 1997-05-30 |
| Jackie Lee | 0-1-0 | 1997-02-07 |
| Jacob Kilburn | 8-4-0 | 2021-01-16 |
| Jacob Volkmann | 19-7-0 | 2013-02-02 |
| Jake Collier | 13-10-0 | 2023-09-23 |
| Jake Ellenberger | 31-15-0 | 2018-08-25 |
| Jake Hecht | 11-4-0 | 2012-06-08 |
| Jake Lindsey | 12-7-0 | 2015-03-14 |
| Jake O'Brien | 15-4-0 | 2009-07-11 |
| Jake Rosholt | 12-5-0 (1 NC) | 2009-11-21 |
| Jake Shields | 31-9-1 (1 NC) | 2014-03-15 |
| James Bochnovic | 8-3-0 | 2018-05-12 |
| James Giboo | 13-5-0 | 2008-07-19 |
| James Hammortree | 6-3-0 | 2010-06-19 |
| James Head | 9-4-0 | 2013-08-28 |
| James Irvin | 17-10-0 (2 NC) | 2010-08-01 |
| James Krause | 28-9-0 | 2020-10-17 |
| James Lee | 15-3-0 (1 NC) | 2008-01-19 |
| James McSweeney | 15-15-0 | 2010-10-16 |
| James Moontasri | 9-5-0 | 2016-12-17 |
| James Mulheron | 11-2-0 | 2017-07-16 |
| James Te Huna | 16-9-0 | 2016-03-19 |
| James Toney | 0-1-0 | 2010-08-28 |
| James Vick | 13-5-0 | 2019-10-12 |
| James Wilks | 7-4-0 | 2010-10-16 |
| James Zikic | 21-10-2 | 2002-07-13 |
| Jamey Simmons | 7-4-0 | 2021-08-07 |
| Jamie Moyle | 4-3-0 | 2018-07-07 |
| Jamie Pickett | 13-11-0 | 2024-03-02 |
| Jamie Varner | 21-11-1 (2 NC) | 2014-12-13 |
| Jamie Yager | 8-4-0 | 2010-06-19 |
| Jared Hamman | 14-6-0 | 2013-08-31 |
| Jared Papazian | 20-13-0 (1 NC) | 2012-12-15 |
| Jared Rollins | 8-4-0 | 2007-12-08 |
| Jared Rosholt | 14-4-0 | 2016-02-06 |
| Jared Vanderaa | 12-10-0 | 2022-10-29 |
| Jarjis Danho | 7-1-1 (1 NC) | 2021-04-10 |
| Jarno Errens | 14-6-1 | 2024-08-10 |
| Jarred Brooks | 13-2-0 | 2018-09-08 |
| Jason Black | 23-4-1 | 2007-10-20 |
| Jason Brilz | 22-6-1 | 2011-11-19 |
| Jason Day | 19-12-0 | 2009-03-07 |
| Jason DeLucia | 33-21-1 | 1999-11-19 |
| Jason Dent | 22-13-0 | 2009-11-21 |
| Jason Fairn | 4-5-0 | 1994-12-16 |