| First | Last | Nickname | Ht. | Wt. | Reach | Stance | W | L | D | Belt |
|---|---|---|---|---|---|---|---|---|---|---|
| Charlie | Kohler | 5' 9" | 155 lbs. | -- | Orthodox | 8 | 4 | 1 | ||
| Tsuyoshi | Kohsaka | TK | 5' 11" | 225 lbs. | -- | Orthodox | 27 | 19 | 2 | |
| Kaloyan | Kolev | 6' 2" | 205 lbs. | 73.0" | Orthodox | 10 | 1 | 0 | ||
| John | Kolosci | 5' 11" | 185 lbs. | -- | Orthodox | 15 | 9 | 0 | ||
| Yuki | Kondo | 5' 11" | 183 lbs. | -- | Southpaw | 60 | 33 | 9 | ||
| Syuri | Kondo | 5' 4" | 115 lbs. | 66.0" | Orthodox | 6 | 3 | 0 | ||
| Mantas | Kondratavicius | 6' 2" | 185 lbs. | 75.0" | Orthodox | 8 | 1 | 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 | 14 | 4 | 0 | ||
| Bruno | Korea | 5' 6" | 135 lbs. | 65.0" | 7 | 3 | 0 | |||
| Chungreng | Koren | The Indian Rhino | -- | 135 lbs. | -- | 7 | 1 | 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 | 10 | 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 |