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| Champion | Won | Lost | Days |
|---|---|---|---|
| Michał Cieślak | 14 Sept 2026 | Current | 37 |
| Noel Mikaelian | 13 Dec 2025 | 14 Sept 2026 | 275 |
| Badou Jack | 11 Dec 2024 | 13 Dec 2025 | 367 |
| Noel Mikaelian | 4 Nov 2023 | 11 Dec 2024 | 403 |
| Ilunga Makabu | 31 Jan 2020 | 26 Feb 2023 | 1,122 |
| Oleksandr Usyk | 27 Jan 2018 | 4 Jun 2019 | 493 |
| Mairis Briedis | 1 Apr 2017 | 27 Jan 2018 | 301 |
| Tony Bellew | 29 May 2016 | 28 Mar 2017 | 303 |
| Grigory Drozd | 27 Sept 2014 | 16 Mar 2016 | 536 |
| Krzysztof Włodarczyk | 15 May 2010 | 27 Sept 2014 | 1,596 |
| Zsolt Erdei | 21 Nov 2009 | 22 Jan 2010 | 62 |
| Giacobbe Fragomeni | 24 Oct 2008 | 21 Nov 2009 | 393 |
| David Haye | 10 Nov 2007 | 12 May 2008 | 184 |
| O'Neil Bell | 7 Jan 2006 | 17 Mar 2007 | 434 |
| Jean-Marc Mormeck | 2 Apr 2005 | 7 Jan 2006 | 280 |
| Wayne Braithwaite | 11 Oct 2002 | 2 Apr 2005 | 904 |
| Juan Carlos Gómez | 21 Feb 1998 | 19 Feb 2002 | 1,459 |
| Marcelo Domínguez | 25 May 1996 | 21 Feb 1998 | 637 |
| Anaclet Wamba | 20 Jul 1991 | 19 Apr 1996 | 1,735 |
| Massimiliano Duran | 27 Jul 1990 | 20 Jul 1991 | 358 |
| Sammy Reeson | 17 May 1989 | 27 Jul 1990 | 436 |
| Carlos de León | 22 Mar 1986 | 9 Apr 1988 | 749 |
| Bernard Benton | 21 Sept 1985 | 22 Mar 1986 | 182 |
| Carlos de León | 17 Jul 1983 | 6 Jun 1985 | 690 |
| S. T. Gordon | 27 Jun 1982 | 17 Jul 1983 | 385 |
| Carlos de León | 25 Nov 1980 | 27 Jun 1982 | 579 |
Built from title bouts on record. Vacated or stripped titles are not visible in bout results, so very recent changes can lag.