/
| Champion | Won | Lost | Days |
|---|---|---|---|
| Shokichi Iwata | 15 Mar 2026 | Current | 220 |
| Knockout CP Freshmart | 4 Dec 2025 | 15 Mar 2026 | 101 |
| Masamichi Yabuki | 22 Sept 2021 | 19 Mar 2022 | 178 |
| Ganigan López | 4 Mar 2016 | 20 May 2017 | 442 |
| Yū Kimura | 28 Nov 2015 | 4 Mar 2016 | 97 |
| Pedro Guevara | 30 Dec 2014 | 28 Nov 2015 | 333 |
| Adrián Hernández | 6 Oct 2012 | 6 Apr 2014 | 547 |
| Kompayak Porpramook | 23 Dec 2011 | 6 Oct 2012 | 288 |
| Gilberto Keb Baas | 6 Nov 2010 | 30 Apr 2011 | 175 |
| Rodel Mayol | 21 Nov 2009 | 19 Jun 2010 | 210 |
| Edgar Sosa | 14 Apr 2007 | 21 Nov 2009 | 952 |
| Omar Niño Romero | 10 Aug 2006 | 1 Feb 2007 | 175 |
| Brian Viloria | 10 Sept 2005 | 10 Aug 2006 | 334 |
| Jorge Arce | 6 Jul 2002 | 23 Feb 2005 | 963 |
| Choi Yo-sam | 17 Oct 1999 | 6 Jul 2002 | 993 |
| Saman Sorjaturong | 15 Jul 1995 | 17 Oct 1999 | 1,555 |
| Humberto González | 19 Feb 1994 | 15 Jul 1995 | 511 |
| Michael Carbajal | 13 Mar 1993 | 19 Feb 1994 | 343 |
| Humberto González | 3 Jun 1991 | 13 Mar 1993 | 649 |
| Rolando Pascua | 19 Dec 1990 | 25 Mar 1991 | 96 |
| Humberto González | 25 Jun 1989 | 19 Dec 1990 | 542 |
| Germán Torres | 11 Dec 1988 | 19 Mar 1989 | 98 |
| Chang Jung-koo | 26 Mar 1983 | 14 Oct 1988 | 2,029 |
| Hilario Zapata | 20 Jul 1982 | 26 Mar 1983 | 249 |
| Kim Sung-jun | 30 Sept 1978 | 3 Jan 1980 | 460 |
| Luis Estaba | 13 Sept 1975 | 19 Feb 1978 | 890 |
Built from title bouts on record. Vacated or stripped titles are not visible in bout results, so very recent changes can lag.