| First | Last | Nickname | Ht. | Wt. | Reach | Stance | W | L | D | Belt |
|---|---|---|---|---|---|---|---|---|---|---|
| Elijah | Smith | Swift | 5' 9" | 135 lbs. | 71.0" | Orthodox | 7 | 1 | 0 | |
| Jacobe | Smith | Cobe | 5' 10" | 170 lbs. | 72.0" | Southpaw | 9 | 0 | 0 | |
| Walter | Smith-Cotito | 5' 8" | 135 lbs. | -- | 4 | 5 | 0 | |||
| Justin | Smitley | -- | 145 lbs. | -- | 10 | 7 | 1 | |||
| Dmitrii | Smoliakov | The Lifeguard | 6' 2" | 253 lbs. | 74.0" | Switch | 9 | 3 | 0 | |
| Louis | Smolka | Da Last Samurai | 5' 9" | 135 lbs. | 68.0" | Orthodox | 17 | 9 | 0 | |
| Cameron | Smotherman | The Baby-Faced Killa | 5' 9" | 135 lbs. | 69.0" | Orthodox | 8 | 4 | 0 | |
| Shimon | Smotritsky | The Assassin | 6' 2" | 170 lbs. | 74.0" | Orthodox | 8 | 2 | 0 | |
| Richie | Smullen | 5' 9" | 155 lbs. | 68.0" | Orthodox | 3 | 1 | 1 | ||
| Devin | Smyth | 5' 10" | 170 lbs. | 72.0" | Switch | 4 | 2 | 0 | ||
| Denis | Sobolev | 6' 3" | 216 lbs. | -- | Orthodox | 4 | 7 | 0 | ||
| Peter | Sobotta | 6' 0" | 170 lbs. | 75.0" | Southpaw | 17 | 7 | 1 | ||
| Renato | Sobral | Babalu | 6' 1" | 205 lbs. | 75.0" | Orthodox | 37 | 11 | 0 | |
| Rameau Thierry | Sokoudjou | The African Assassin | 5' 10" | 205 lbs. | 78.0" | Orthodox | 18 | 18 | 0 | |
| Alexander | Soldatkin | 6' 2" | 250 lbs. | 75.0" | Orthodox | 14 | 4 | 0 | ||
| Joe | Solecki | 5' 9" | 155 lbs. | 70.0" | Orthodox | 13 | 5 | 0 | ||
| Chris | Solomon | 5' 11" | 155 lbs. | -- | 0 | 0 | 0 | |||
| Joe | Son | 5' 4" | 236 lbs. | -- | Orthodox | 0 | 4 | 0 | ||
| Paul | Song | -- | 185 lbs. | -- | 2 | 2 | 0 | |||
| Song | Kenan | The Assassin | 6' 0" | 170 lbs. | 71.0" | Orthodox | 21 | 8 | 0 | |
| Song | Yadong | Kung Fu Kid | 5' 8" | 135 lbs. | 67.0" | Orthodox | 21 | 8 | 1 | |
| YoungJae | Song | Super Rookie | 5' 7" | 145 lbs. | 70.0" | Orthodox | 6 | 1 | 1 | |
| Emrah | Sonmez | Anatolian Wolf | 5' 10" | 145 lbs. | 71.0" | Orthodox | 14 | 5 | 0 | |
| Chael | Sonnen | 6' 1" | 205 lbs. | 73.0" | Southpaw | 29 | 15 | 1 |