| First | Last | Nickname | Ht. | Wt. | Reach | Stance | W | L | D | Belt |
|---|---|---|---|---|---|---|---|---|---|---|
| Syuri | Kondo | 5' 4" | 115 lbs. | 66.0" | Orthodox | 6 | 3 | 0 | ||
| Cheick | Kongo | 6' 4" | 240 lbs. | 82.0" | Orthodox | 27 | 10 | 2 | ||
| Andrei | Kopylov | 6' 2" | 265 lbs. | -- | Orthodox | 6 | 11 | 0 | ||
| Roman | Kopylov | 6' 0" | 185 lbs. | 75.0" | Southpaw | 13 | 3 | 0 | ||
| Bruno | Korea | 5' 6" | 135 lbs. | 65.0" | 7 | 3 | 0 | |||
| Andrey | Koreshkov | Spartan | 6' 0" | 170 lbs. | -- | 19 | 2 | 0 | ||
| Josh | Koscheck | 5' 10" | 170 lbs. | 73.0" | Orthodox | 17 | 11 | 0 | ||
| Steven | Koslow | Obi Won Shinobi The Pillow | 5' 7" | 125 lbs. | 69.0" | Switch | 6 | 1 | 0 | |
| Naoyuki | Kotani | 5' 8" | 155 lbs. | 66.0" | Southpaw | 34 | 14 | 7 | ||
| Ilya | Kotau | -- | 170 lbs. | -- | 1 | 2 | 0 | |||
| Iouri | Kotchkine | 6' 2" | 235 lbs. | -- | Orthodox | 7 | 4 | 1 | ||
| Matt | Kovacs | 300 | 6' 0" | 244 lbs. | -- | Orthodox | 12 | 16 | 0 | |
| Marcus | Kowal | -- | 135 lbs. | -- | 3 | 1 | 1 | |||
| Karolina | Kowalkiewicz | 5' 3" | 115 lbs. | 64.0" | Orthodox | 16 | 9 | 0 | ||
| Steve | Kozola | -- | 155 lbs. | -- | 8 | 0 | 0 | |||
| Derrick | Krantz | D-Rock | 5' 10" | 170 lbs. | 72.0" | Orthodox | 22 | 12 | 0 | |
| James | Krause | The | 6' 2" | 170 lbs. | 73.0" | Orthodox | 28 | 9 | 0 | |
| Pascal | Krauss | Panzer | 6' 1" | 170 lbs. | -- | Orthodox | 11 | 2 | 0 | |
| Rene | Kronvold | 5' 8" | 170 lbs. | -- | Orthodox | 5 | 1 | 0 | ||
| Kaynan | Kruschewsky | Bahia | 6' 0" | 155 lbs. | 73.0" | Orthodox | 15 | 3 | 0 | |
| Jorgen | Kruth | The Last Viking | 6' 2" | 205 lbs. | -- | 5 | 0 | 0 | ||
| Nikita | Krylov | The Miner | 6' 3" | 205 lbs. | 77.0" | Orthodox | 30 | 9 | 0 | |
| Mariusz | Ksiazkiewicz | The Iron Pol | 6' 3" | 185 lbs. | 75.0" | Southpaw | 8 | 1 | 0 | |
| Junya | Kudo | -- | 135 lbs. | -- | Orthodox | 10 | 7 | 2 |