| Fighter | Record | Last Bout |
|---|---|---|
| Jake Ellenberger | 31-15-0 | 2018-08-25 |
| Jake Hadley | 11-4-0 | 2024-10-19 |
| Jake Hecht | 11-4-0 | 2012-06-08 |
| Jake Lindsey | 12-7-0 | 2015-03-14 |
| Jake Matthews | 23-8-0 | 2026-05-30 |
| 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 |
| Jakub Wiklacz | 18-3-2 | 2026-02-07 |
| Jalin Turner | 16-9-0 | 2026-08-15 |
| Jamahal Hill | 12-4-0 (1 NC) | 2025-06-21 |
| Jamal Pogues | 11-5-0 | 2025-02-01 |
| Jamall Emmers | 23-8-0 | 2026-08-22 |
| 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 Llontop | 14-5-0 | 2024-11-16 |
| 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 |
| Jamey-Lyn Horth | 9-3-0 | 2026-10-17 |
| Jamie Moyle | 4-3-0 | 2018-07-07 |
| Jamie Mullarkey | 18-9-0 | 2026-01-31 |
| Jamie Pickett | 13-11-0 | 2024-03-02 |
| Jamie Siraj | 14-4-0 | 2026-04-18 |
| Jamie Varner | 21-11-1 (2 NC) | 2014-12-13 |
| Jamie Yager | 8-4-0 | 2010-06-19 |
| Jan Blachowicz | 29-12-2 | 2026-08-01 |
| Jaqueline Amorim | 11-2-0 | 2026-05-30 |
| Jared Cannonier | 18-10-0 | 2026-07-18 |
| Jared Gooden | 23-10-0 | 2024-10-12 |
| Jared Gordon | 21-9-0 (1 NC) | 2026-05-09 |
| 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 |