/
| Champion | Won | Lost | Days |
|---|---|---|---|
| Thanongsak Simsri | 19 Jun 2025 | Current | 488 |
| Masamichi Yabuki | 12 Oct 2024 | 10 Apr 2025 | 180 |
| Adrian Curiel | 4 Nov 2023 | 16 Feb 2024 | 104 |
| Sivenathi Nontshinga | 3 Sept 2022 | 4 Nov 2023 | 427 |
| Felix Alvarado | 29 Oct 2018 | 21 Mar 2022 | 1,239 |
| Ryōichi Taguchi | 31 Dec 2017 | 20 May 2018 | 140 |
| Akira Yaegashi | 29 Dec 2015 | 21 May 2017 | 509 |
| Javier Mendoza | 20 Sept 2014 | 29 Dec 2015 | 465 |
| John Riel Casimero | 20 Jul 2012 | 2 May 2014 | 651 |
| Ulises Solís | 30 Apr 2011 | 20 Jul 2012 | 447 |
| Luis Alberto Lazarte | 29 May 2010 | 30 Apr 2011 | 336 |
| Brian Viloria | 19 Apr 2009 | 23 Jan 2010 | 279 |
| Ulises Solís | 7 Jan 2006 | 19 Apr 2009 | 1,198 |
| Will Grigsby | 14 May 2005 | 7 Jan 2006 | 238 |
| Víctor Burgos | 15 Feb 2003 | 14 May 2005 | 819 |
| Ricardo López | 2 Oct 1999 | 27 Nov 2002 | 1,152 |
| Will Grigsby | 18 Dec 1998 | 2 Oct 1999 | 288 |
| Mauricio Pastrana | 13 Dec 1997 | 28 Aug 1998 | 258 |
| Melchor Cob Castro | 16 Mar 1996 | 18 Jan 1997 | 308 |
| Humberto González | 19 Feb 1994 | 15 Jul 1995 | 511 |
| Michael Carbajal | 29 Jul 1990 | 19 Feb 1994 | 1,301 |
| Muangchai Kittikasem | 2 May 1989 | 29 Jul 1990 | 453 |
| Tacy Macalos | 4 Nov 1988 | 2 May 1989 | 179 |
| Choi Jum-hwan | 7 Dec 1986 | 4 Nov 1988 | 698 |
| Dodie Boy Peñalosa | 10 Dec 1983 | 18 Jul 1986 | 951 |
Built from title bouts on record. Vacated or stripped titles are not visible in bout results, so very recent changes can lag.