/
| Champion | Won | Lost | Days |
|---|---|---|---|
| Agit Kabayel | 27 Jun 2026 | Current | 116 |
| Oleksandr Usyk | 18 May 2024 | 26 Jun 2026 | 769 |
| Tyson Fury | 22 Feb 2020 | 18 May 2024 | 1,547 |
| Deontay Wilder | 17 Jan 2015 | 22 Feb 2020 | 1,862 |
| Bermane Stiverne | 10 May 2014 | 17 Jan 2015 | 252 |
| Vitali Klitschko | 11 Oct 2008 | 16 Dec 2013 | 1,892 |
| Oleg Maskaev | 12 Aug 2006 | 8 Mar 2008 | 574 |
| Hasim Rahman | 9 Nov 2005 | 12 Aug 2006 | 276 |
| Vitali Klitschko | 24 Apr 2004 | 9 Nov 2005 | 564 |
| Lennox Lewis | 17 Nov 2001 | 6 Feb 2004 | 811 |
| Oliver McCall | 7 Feb 1997 | 22 Apr 2001 | 1,535 |
| Frank Bruno | 2 Sept 1995 | 16 Mar 1996 | 196 |
| Oliver McCall | 24 Sept 1994 | 2 Sept 1995 | 343 |
| Lennox Lewis | 14 Dec 1992 | 24 Sept 1994 | 649 |
| Evander Holyfield | 25 Oct 1990 | 13 Nov 1992 | 750 |
| Mike Tyson | 22 Nov 1986 | 11 Feb 1990 | 1,177 |
| Pinklon Thomas | 31 Aug 1984 | 22 Mar 1986 | 568 |
| Larry Holmes | 9 Jun 1978 | 11 Dec 1983 | 2,011 |
| Muhammad Ali | 30 Oct 1974 | 15 Feb 1978 | 1,204 |
| George Foreman | 22 Jan 1973 | 30 Oct 1974 | 646 |
| Joe Frazier | 16 Feb 1970 | 22 Jan 1973 | 1,071 |
| Muhammad Ali | 25 Feb 1964 | 6 Mar 1969 | 1,836 |
| Sonny Liston | 22 Jul 1963 | 25 Feb 1964 | 218 |
Built from title bouts on record. Vacated or stripped titles are not visible in bout results, so very recent changes can lag.