/
| Champion | Won | Lost | Days |
|---|---|---|---|
| Naoya Inoue | 25 Jul 2023 | Current | 1,184 |
| Stephen Fulton | 27 Nov 2021 | 25 Jul 2023 | 605 |
| Luis Nery | 26 Sept 2020 | 15 May 2021 | 231 |
| Rey Vargas | 25 Feb 2017 | 14 Aug 2020 | 1,266 |
| Julio Ceja | 1 Nov 2015 | 27 Feb 2016 | 118 |
| Leo Santa Cruz | 24 Aug 2013 | 1 Nov 2015 | 799 |
| Abner Mares | 21 Apr 2012 | 31 Jan 2013 | 285 |
| Toshiaki Nishioka | 18 Dec 2008 | 15 Mar 2012 | 1,183 |
| Israel Vázquez | 4 Aug 2007 | 18 Dec 2008 | 502 |
| Israel Vázquez | 12 Dec 2005 | 3 Mar 2007 | 446 |
| Óscar Larios | 1 Nov 2002 | 12 Dec 2005 | 1,137 |
| Willie Jorrín | 9 Sept 2000 | 1 Nov 2002 | 783 |
| Erik Morales | 6 Sept 1997 | 20 Jul 2000 | 1,048 |
| Daniel Zaragoza | 6 Nov 1995 | 6 Sept 1997 | 670 |
| Hector Acero Sanchez | 26 Aug 1994 | 6 Nov 1995 | 437 |
| Tracy Harris Patterson | 23 Jun 1992 | 26 Aug 1994 | 794 |
| Daniel Zaragoza | 24 Jun 1991 | 20 Mar 1992 | 270 |
| Pedro Ruben Decima | 5 Nov 1990 | 23 Feb 1991 | 110 |
| Daniel Zaragoza | 29 Feb 1988 | 23 Apr 1990 | 784 |
| Jeff Fenech | 8 May 1987 | 27 Jan 1988 | 264 |
| Samart Payakaroon | 18 Jan 1986 | 8 May 1987 | 475 |
| Lupe Pintor | 18 Aug 1985 | 18 Jan 1986 | 153 |
| Juan Meza | 3 Nov 1984 | 18 Aug 1985 | 288 |
| Jaime Garza | 15 Jun 1983 | 3 Nov 1984 | 507 |
| Wilfredo Gómez | 21 May 1977 | 26 May 1983 | 2,196 |
| Yum Dong-kyun | 24 Nov 1976 | 21 May 1977 | 178 |
Built from title bouts on record. Vacated or stripped titles are not visible in bout results, so very recent changes can lag.
