/
| Champion | Won | Lost | Days |
|---|---|---|---|
| Murat Gassiev | 26 Jun 2026 | Current | 117 |
| Oleksandr Usyk | 25 Sept 2021 | 26 Jun 2026 | 1,735 |
| Anthony Joshua | 7 Dec 2019 | 25 Sept 2021 | 658 |
| Anthony Joshua | 29 Apr 2017 | 1 Jun 2019 | 763 |
| David Haye | 7 Nov 2009 | 2 Jul 2011 | 602 |
| John Ruiz | 30 Aug 2008 | 7 Nov 2009 | 434 |
| Ruslan Chagaev | 14 Apr 2007 | 3 Jul 2008 | 446 |
| Nikolai Valuev | 17 Dec 2005 | 14 Apr 2007 | 483 |
| John Ruiz | 24 Feb 2004 | 17 Dec 2005 | 662 |
| Roy Jones Jr. | 1 Mar 2003 | 24 Feb 2004 | 360 |
| John Ruiz | 3 Mar 2001 | 1 Mar 2003 | 728 |
| John Ruiz | 12 Aug 2000 | 3 Mar 2001 | 203 |
| Lennox Lewis | 13 Nov 1999 | 12 Apr 2000 | 151 |
| Evander Holyfield | 9 Nov 1996 | 13 Nov 1999 | 1,099 |
| Bruce Seldon | 8 Apr 1995 | 7 Sept 1996 | 518 |
| George Foreman | 5 Nov 1994 | 4 Mar 1995 | 119 |
| Evander Holyfield | 6 Nov 1993 | 22 Apr 1994 | 167 |
| Riddick Bowe | 13 Nov 1992 | 6 Nov 1993 | 358 |
| Evander Holyfield | 25 Oct 1990 | 13 Nov 1992 | 750 |
| Mike Tyson | 7 Mar 1987 | 11 Feb 1990 | 1,072 |
| James Smith | 12 Dec 1986 | 7 Mar 1987 | 85 |
| Tony Tubbs | 29 Apr 1985 | 17 Jan 1986 | 263 |
| Greg Page | 1 Dec 1984 | 29 Apr 1985 | 149 |
| Gerrie Coetzee | 23 Sept 1983 | 1 Dec 1984 | 435 |
| Michael Dokes | 10 Dec 1982 | 23 Sept 1983 | 287 |
| Mike Weaver | 31 Mar 1980 | 10 Dec 1982 | 984 |
| John Tate | 20 Oct 1979 | 31 Mar 1980 | 163 |
| Muhammad Ali | 15 Sept 1978 | 3 Jul 1979 | 291 |
| 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 |
| Jimmy Ellis | 27 Apr 1968 | 16 Feb 1970 | 660 |
| Ernie Terrell | 5 Mar 1965 | 6 Feb 1967 | 703 |
| Sonny Liston | 25 Sept 1962 | 25 Feb 1964 | 518 |
| Floyd Patterson | 20 Jun 1960 | 25 Sept 1962 | 827 |
| Ingemar Johansson | 26 Jun 1959 | 20 Jun 1960 | 360 |
| Floyd Patterson | 30 Nov 1956 | 26 Jun 1959 | 938 |
| Rocky Marciano | 23 Sept 1952 | 27 Apr 1956 | 1,312 |
| Jersey Joe Walcott | 18 Jul 1951 | 23 Sept 1952 | 433 |
| Ezzard Charles | 22 Jun 1949 | 18 Jul 1951 | 756 |
| Joe Louis | 22 Jun 1937 | 1 Mar 1949 | 4,270 |
| James J. Braddock | 13 Jun 1935 | 22 Jun 1937 | 740 |
| Max Baer | 14 Jun 1934 | 13 Jun 1935 | 364 |
| Primo Carnera | 29 Jun 1933 | 14 Jun 1934 | 350 |
| Jack Sharkey | 21 Jun 1932 | 29 Jun 1933 | 373 |
| Max Schmeling | 12 Jun 1930 | 21 Jun 1932 | 740 |
| Gene Tunney | 23 Sept 1926 | 31 Jul 1928 | 677 |
Built from title bouts on record. Vacated or stripped titles are not visible in bout results, so very recent changes can lag.
