| Fighter | Record | Last Bout |
|---|---|---|
| Daichi Abe | 6-2-0 | 2018-06-23 |
| Damien Anderson | 5-1-0 | 2026-07-18 |
| Dan Argueta | 9-3-0 (2 NC) | 2024-10-12 |
| Danny Abbadi | 4-6-0 | 2006-09-23 |
| David Abbott | 10-15-0 | 2003-11-21 |
| Douglas Silva de Andrade | 29-7-0 (1 NC) | 2026-02-28 |
| Dylan Andrews | 18-7-0 (1 NC) | 2015-05-09 |
| Eddie Alvarez | 29-6-0 (1 NC) | 2018-07-28 |
| Ericka Almeida | 7-3-0 | 2015-10-24 |
| Eryk Anders | 18-9-0 (1 NC) | 2026-03-14 |
| Felipe Arantes | 18-10-1 (2 NC) | 2018-06-23 |
| Gadzhimurad Antigulov | 20-8-0 | 2020-10-17 |
| Garrett Armfield | 10-5-0 | 2024-11-02 |
| Gilbert Aldana | 6-2-0 | 2006-07-08 |
| Hamdy Abdelwahab | 7-1-0 (1 NC) | 2025-10-25 |
| Hector Aldana | 4-3-0 | 2019-10-12 |
| Houston Alexander | 17-15-1 (2 NC) | 2009-12-05 |
| Hunter Azure | 9-2-0 | 2021-04-10 |
| Hyder Amil | 11-3-0 | 2026-06-20 |
| Ibo Aslan | 14-4-0 | 2025-12-06 |
| Igor Araujo | 25-9-0 (1 NC) | 2015-07-15 |
| Ikram Aliskerov | 18-2-0 | 2026-06-27 |
| Ildemar Alcantara | 21-11-0 | 2015-07-15 |
| Ilimbek Akylbek Uulu | 10-3-0 | 2026-09-26 |
| Irene Aldana | 15-8-0 | 2024-09-14 |
| Irina Alekseeva | 5-4-0 | 2025-10-11 |
| Israel Adesanya | 24-6-0 | 2026-03-28 |
| Iuri Alcantara | 35-10-0 (1 NC) | 2018-08-25 |
| JJ Aldrich | 15-7-0 | 2026-09-12 |
| Jailton Almeida | 22-5-0 | 2026-02-07 |
| Jaqueline Amorim | 11-2-0 | 2026-05-30 |
| Jermaine Andre | 14-4-0 | 2000-03-10 |
| Jessica Aguilar | 20-8-0 | 2019-03-30 |
| Jessica Andrade | 26-15-0 | 2025-08-16 |
| Jessin Ayari | 16-6-0 | 2020-10-03 |
| Jesus Aguilar | 12-4-0 | 2026-03-07 |
| Jim Alers | 13-3-0 (1 NC) | 2016-07-23 |
| Joel Alvarez | 23-5-0 | 2026-08-15 |
| John Albert | 6-5-0 | 2013-07-27 |
| John Alessio | 35-17-0 (2 NC) | 2012-07-07 |
| John Allan | 13-7-0 (1 NC) | 2021-11-06 |
| Jose Aldo | 32-10-0 | 2025-05-10 |
| Juan Adams | 5-3-0 | 2020-02-08 |
| Julia Avila | 9-4-0 | 2025-02-15 |
| Julio Arce | 19-6-0 | 2024-03-30 |
| Junior Albini | 14-6-0 | 2019-06-29 |
| Junior Assuncao | 16-6-0 | 2011-12-30 |
| Kai Asakura | 23-6-0 | 2026-08-29 |
| Kevin Aguilar | 17-5-0 | 2021-05-15 |
| Khusein Askhabov | 23-1-0 | 2023-02-18 |