/
| Champion | Won | Lost | Days |
|---|---|---|---|
| René Santiago | 30 Sept 2026 | Current | 21 |
| René Santiago | 17 Dec 2025 | 28 Jul 2026 | 223 |
| Erick Rosa | 19 Dec 2024 | 30 Jul 2025 | 223 |
| Hiroto Kyoguchi | 31 Dec 2018 | 1 Nov 2022 | 1,401 |
| Ryōichi Taguchi | 31 Dec 2014 | 31 Dec 2017 | 1,096 |
| Román González | 4 Feb 2011 | 30 Nov 2012 | 665 |
| Juan Carlos Reveco | 26 Nov 2010 | 4 Feb 2011 | 70 |
| Giovani Segura | 5 Jun 2009 | 28 Aug 2010 | 449 |
| Brahim Asloum | 8 Dec 2007 | 18 Jul 2008 | 223 |
| Kōki Kameda | 2 Aug 2006 | 18 Jan 2007 | 169 |
| Roberto Vásquez | 29 Apr 2005 | 24 May 2006 | 390 |
| Rosendo Álvarez | 3 Mar 2001 | 2 Oct 2004 | 1,309 |
| Beibis Mendoza | 12 Aug 2000 | 3 Mar 2001 | 203 |
| Choi Hi-yong | 4 Feb 1995 | 13 Jan 1996 | 343 |
| Leo Gamez | 21 Oct 1993 | 4 Feb 1995 | 471 |
| Hiroki Ioka | 17 Dec 1991 | 18 Nov 1992 | 337 |
| Yuh Myung-woo | 8 Dec 1985 | 17 Dec 1991 | 2,200 |
| Francisco Quiroz | 19 May 1984 | 29 Mar 1985 | 314 |
| Lupe Madera | 10 Jul 1983 | 19 May 1984 | 314 |
| Katsuo Tokashiki | 16 Dec 1981 | 10 Jul 1983 | 571 |
| Yōkō Gushiken | 10 Oct 1976 | 8 Mar 1981 | 1,610 |
| Jaime Rios | 23 Aug 1975 | 2 Jul 1976 | 314 |
Built from title bouts on record. Vacated or stripped titles are not visible in bout results, so very recent changes can lag.