/
| Champion | Won | Lost | Days |
|---|---|---|---|
| Emanuel Navarrete | 28 Feb 2026 | Current | 234 |
| Eduardo Núñez | 28 May 2025 | 28 Feb 2026 | 276 |
| Anthony Cacace | 18 May 2024 | 31 Jan 2025 | 258 |
| Joe Cordina | 22 Apr 2023 | 18 May 2024 | 392 |
| Shavkat Rakhimov | 5 Nov 2022 | 22 Apr 2023 | 168 |
| Kenichi Ogawa | 27 Nov 2021 | 4 Jun 2022 | 189 |
| Joseph Diaz | 30 Jan 2020 | 12 Feb 2021 | 379 |
| Tevin Farmer | 3 Aug 2018 | 30 Jan 2020 | 545 |
| José Pedraza | 13 Jun 2015 | 13 Jan 2017 | 580 |
| Rances Barthelemy | 10 Jul 2014 | 10 Feb 2015 | 215 |
| Argenis Mendez | 9 Mar 2013 | 10 Jul 2014 | 488 |
| Juan Carlos Salgado | 10 Sept 2011 | 9 Mar 2013 | 546 |
| Cassius Baloyi | 1 Sept 2010 | 19 May 2011 | 260 |
| Robert Guerrero | 22 Aug 2009 | 16 Feb 2010 | 178 |
| Cassius Baloyi | 12 Apr 2008 | 18 Apr 2009 | 371 |
| Mzonke Fana | 20 Apr 2007 | 12 Apr 2008 | 358 |
| Malcolm Klassen | 4 Nov 2006 | 20 Apr 2007 | 167 |
| Marco Antonio Barrera | 17 Sept 2005 | 19 Apr 2006 | 214 |
| Carlos Hernández | 1 Feb 2003 | 31 Jul 2004 | 546 |
| Steve Forbes | 3 Dec 2000 | 17 Aug 2002 | 622 |
| Diego Corrales | 23 Oct 1999 | 22 Oct 2000 | 365 |
| Robert Garcia | 13 Mar 1998 | 23 Oct 1999 | 589 |
| Arturo Gatti | 15 Dec 1995 | 8 Feb 1998 | 786 |
| John John Molina | 22 Feb 1992 | 20 Feb 1995 | 1,094 |
| Brian Mitchell | 13 Sept 1991 | 24 Jan 1992 | 133 |
| Tony Lopez | 20 May 1990 | 13 Sept 1991 | 481 |
| John John Molina | 7 Oct 1989 | 20 May 1990 | 225 |
| Tony Lopez | 23 Jul 1988 | 7 Oct 1989 | 441 |
| Rocky Lockridge | 9 Sept 1987 | 23 Jul 1988 | 318 |
| Barry Michael | 12 Jul 1985 | 9 Sept 1987 | 789 |
| Yuh Hwan-kil | 22 Apr 1984 | 15 Feb 1985 | 299 |
Built from title bouts on record. Vacated or stripped titles are not visible in bout results, so very recent changes can lag.