/
| Champion | Won | Lost | Days |
|---|---|---|---|
| Rafael Espinoza | 9 Dec 2023 | Current | 1,047 |
| Emanuel Navarrete | 9 Oct 2020 | 9 Feb 2023 | 853 |
| Shakur Stevenson | 26 Oct 2019 | 7 Jul 2020 | 255 |
| Óscar Valdez | 23 Jul 2016 | 2 Aug 2019 | 1,105 |
| Orlando Cruz | 12 Oct 2013 | 28 Feb 2014 | 139 |
| Orlando Salido | 16 Apr 2011 | 19 Jan 2013 | 644 |
| Juan Manuel López | 23 Jan 2010 | 16 Apr 2011 | 448 |
| Steven Luevano | 14 Jul 2007 | 23 Jan 2010 | 924 |
| Scott Harrison | 29 Nov 2003 | 6 Dec 2006 | 1,103 |
| Scott Harrison | 19 Oct 2002 | 12 Jul 2003 | 266 |
| Pablo Chacón | 16 Jun 2001 | 19 Oct 2002 | 490 |
| Naseem Hamed | 30 Sept 1995 | 5 Oct 2000 | 1,832 |
| Steve Robinson | 17 Apr 1993 | 30 Sept 1995 | 896 |
| Maurizio Stecca | 26 Jan 1991 | 16 Feb 1992 | 386 |
| Jorge Páez | 7 Apr 1990 | 16 Jan 1991 | 284 |
| Louie Espinoza | 11 Nov 1989 | 7 Apr 1990 | 147 |
Built from title bouts on record. Vacated or stripped titles are not visible in bout results, so very recent changes can lag.