/
| Champion | Won | Lost | Days |
|---|---|---|---|
| Lee Sung-hyun | 24 Sept 2021 | Current | 1,852 |
| Gary Mack | 7 Apr 2021 | 24 Sept 2021 | 170 |
| Donovan Wisse | 26 Feb 2021 | 7 Apr 2021 | 40 |
| Meison Hide Usami | 30 Oct 2020 | 26 Feb 2021 | 119 |
Built from title bouts on record. Vacated or stripped titles are not visible in bout results, so very recent changes can lag.