| First | Last | Nickname | Ht. | Wt. | Reach | Stance | W | L | D | Belt |
|---|---|---|---|---|---|---|---|---|---|---|
| Tom | Aaron | -- | 155 lbs. | -- | 5 | 3 | 0 | |||
| Danny | Abbadi | The Assassin | 5' 11" | 155 lbs. | -- | Orthodox | 4 | 6 | 0 | |
| Nariman | Abbasov | Bayraktar | 5' 8" | 155 lbs. | 66.0" | Orthodox | 28 | 4 | 0 | |
| David | Abbott | Tank | 6' 0" | 265 lbs. | -- | Switch | 10 | 15 | 0 | |
| Hamdy | Abdelwahab | The Hammer | 6' 2" | 264 lbs. | 72.0" | Southpaw | 5 | 0 | 0 | |
| Shamil | Abdurakhimov | Abrek | 6' 3" | 235 lbs. | 76.0" | Orthodox | 20 | 8 | 0 | |
| Hiroyuki | Abe | Abe Ani | 5' 6" | 145 lbs. | -- | Orthodox | 8 | 15 | 3 | |
| Daichi | Abe | 5' 11" | 170 lbs. | 71.0" | Orthodox | 6 | 2 | 0 | ||
| Papy | Abedi | Makambo | 5' 11" | 185 lbs. | -- | Southpaw | 10 | 4 | 0 | |
| Ricardo | Abreu | Demente | 5' 11" | 185 lbs. | -- | Orthodox | 5 | 1 | 0 | |
| Klidson | Abreu | White Bear | 6' 0" | 205 lbs. | 74.0" | Orthodox | 15 | 4 | 0 | |
| Cyborg | Abreu | -- | -- | -- | 0 | 0 | 0 | |||
| Daniel | Acacio | 5' 8" | 180 lbs. | -- | Orthodox | 30 | 18 | 0 | ||
| John | Adajar | The Outlaw | 5' 9" | 170 lbs. | 75.0" | Orthodox | 6 | 2 | 0 | |
| Scott | Adams | 6' 0" | 225 lbs. | -- | Southpaw | 8 | 1 | 0 | ||
| Juan | Adams | The Kraken | 6' 5" | 265 lbs. | 80.0" | Orthodox | 5 | 3 | 0 | |
| Anthony | Adams | Sugafoot | 6' 1" | 185 lbs. | 76.0" | Orthodox | 8 | 2 | 0 | |
| Zarrukh | Adashev | The Lion | 5' 5" | 125 lbs. | 65.0" | Southpaw | 4 | 4 | 0 | |
| Israel | Adesanya | The Last Stylebender | 6' 4" | 185 lbs. | 80.0" | Switch | 24 | 3 | 0 | |
| Sam | Adkins | The Experience | 6' 3" | 225 lbs. | -- | Orthodox | 7 | 20 | 2 | |
| Nick | Agallar | 5' 8" | 155 lbs. | -- | Orthodox | 24 | 6 | 0 | ||
| Mariya | Agapova | Demonslayer | 5' 6" | 125 lbs. | 68.0" | Southpaw | 10 | 4 | 0 | |
| Marcelo | Aguiar | 5' 10" | 170 lbs. | -- | Orthodox | 2 | 3 | 1 | ||
| Fabio | Aguiar | 6' 0" | 185 lbs. | -- | 17 | 1 | 0 | |||
| Edwin | Aguilar | Tigre | 5' 10" | 185 lbs. | -- | 26 | 19 | 0 |