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| Champion | Won | Lost | Days |
|---|---|---|---|
| Ryad Merhy | 30 May 2026 | Current | 145 |
| Kevin Lerena | 8 Oct 2024 | 30 May 2026 | 599 |
| Łukasz Różański | 22 Apr 2023 | 24 May 2024 | 398 |
| Óscar Rivas | 22 Oct 2021 | 6 Jan 2023 | 441 |
Built from title bouts on record. Vacated or stripped titles are not visible in bout results, so very recent changes can lag.