/
| Champion | Won | Lost | Days |
|---|---|---|---|
| Josh Kelly | 31 Jan 2026 | Current | 263 |
| Bakhram Murtazaliev | 6 Apr 2024 | 31 Jan 2026 | 665 |
| Jermell Charlo | 26 Sept 2020 | 21 Nov 2023 | 1,151 |
| Julian Williams | 11 May 2019 | 18 Jan 2020 | 252 |
| Jarrett Hurd | 25 Feb 2017 | 11 May 2019 | 805 |
| Jermall Charlo | 12 Sept 2015 | 16 Feb 2017 | 523 |
| Cornelius Bundrage | 11 Oct 2014 | 12 Sept 2015 | 336 |
| Carlos Molina | 14 Sept 2013 | 11 Oct 2014 | 392 |
| Cornelius Bundrage | 7 Aug 2010 | 23 Feb 2013 | 931 |
| Cory Spinks | 8 Jul 2006 | 27 Mar 2008 | 628 |
| Roman Karmazin | 14 Jul 2005 | 8 Jul 2006 | 359 |
| Kassim Ouma | 2 Oct 2004 | 14 Jul 2005 | 285 |
| Winky Wright | 12 Oct 2001 | 19 Apr 2004 | 920 |
| Félix Trinidad | 2 Dec 2000 | 20 May 2001 | 169 |
| Fernando Vargas | 12 Dec 1998 | 2 Dec 2000 | 721 |
| Terry Norris | 16 Dec 1995 | 19 Mar 1997 | 459 |
| Vincent Pettway | 17 Sept 1994 | 12 Aug 1995 | 329 |
| Gianfranco Rosi | 15 Jul 1989 | 17 Sept 1994 | 1,890 |
| Robert Hines | 4 Nov 1988 | 5 Feb 1989 | 93 |
| Matthew Hilton | 27 Jun 1987 | 4 Nov 1988 | 496 |
| Buster Drayton | 4 Jun 1986 | 27 Jun 1987 | 388 |
| Carlos Santos | 2 Nov 1984 | 4 Jun 1986 | 579 |
Built from title bouts on record. Vacated or stripped titles are not visible in bout results, so very recent changes can lag.