Poids Plumes Hommes
 | Kaisei Kuroi | 0-1-0 REC | #6842 |  |
 | Kaiwen Li | 3-3-0 REC | #1821 |  |
 | Kaleio Romero | 0-1-0 REC | #7168 |  |
 | Kaleo Meheula | #7249 | | |
 | Kallum Parker | 1-4-0 REC | #4609 |  |
 | Kamal Mamedov | 0-3-0 REC | #3445 |  |
 | Kangjie Zhu | 0-1-0 UFC | #2095 | |
 | Karol Kutyla | 0-5-0 REC | #3369 |  |
 | Karol Rysavy | 8-7-1 REC | #746 |  |
 | Karshyga Dautbek | 3-0-0, 1NC REC | #2667 |  |
 | Kazakbai Tilenov | 0-1-0 REC | #6582 |  |
 | Kazuki Aimoto | #7785 | | |
 | Kazumasa Majima | 2-1-0 REC | #852 | |
 | Keegan Witbeck | 0-1-0 REC | #7427 | |
 | Keiichiro Nakamura | 3-0-0 REC | #1101 | |
 | Keisuke Sasu | 1-4-0 REC | #3013 | |
 | Keith Keogh | 3-0-0 REC | #1033 |  |
 | Kenny Florian | 12-5-0 UFC | #467 | |
 | Keremuaili Maimaitituoheti | 0-1-0 REC | #6929 | |
 | Kestin McClain | 1-0-0 REC | #1704 | |