/
| Champion | Won | Lost | Days |
|---|---|---|---|
| Christian Medina | 14 Sept 2025 | Current | 401 |
| Yoshiki Takei | 6 May 2024 | 14 Sept 2025 | 496 |
| Jason Moloney | 13 May 2023 | 6 May 2024 | 359 |
| Naoya Inoue | 13 Dec 2022 | 13 Jan 2023 | 31 |
| John Riel Casimero | 30 Nov 2019 | 3 May 2022 | 885 |
| Zolani Tete | 23 Apr 2017 | 30 Nov 2019 | 951 |
| Marlon Tapales | 27 Jul 2016 | 22 Apr 2017 | 269 |
| Pungluang Sor Singyu | 8 Aug 2015 | 27 Jul 2016 | 354 |
| Tomoki Kameda | 1 Aug 2013 | 23 Apr 2015 | 630 |
| Pungluang Sor Singyu | 20 Oct 2012 | 2 Mar 2013 | 133 |
| Jorge Arce | 26 Nov 2011 | 15 Aug 2012 | 263 |
| Fernando Montiel | 25 Apr 2009 | 19 Feb 2011 | 665 |
| Gerry Peñalosa | 11 Aug 2007 | 25 Apr 2009 | 623 |
| Jhonny González | 29 Oct 2005 | 11 Aug 2007 | 651 |
| Ratanachai Sor Vorapin | 7 May 2004 | 29 Oct 2005 | 540 |
| Cruz Carbajal | 15 Mar 2002 | 7 May 2004 | 784 |
| Mauricio Martínez | 4 Sept 2000 | 15 Mar 2002 | 557 |
| Robbie Regan | 26 Apr 1996 | 18 Jul 1997 | 448 |
| Daniel Jiménez | 21 Oct 1995 | 26 Apr 1996 | 188 |
| Alfred Kotey | 30 Jul 1994 | 21 Oct 1995 | 448 |
| Rafael del Valle | 13 May 1992 | 30 Jul 1994 | 808 |
| Duke McKenzie | 30 Jun 1991 | 13 May 1992 | 318 |
| Israel Contreras | 3 Feb 1989 | 20 Feb 1991 | 747 |
Built from title bouts on record. Vacated or stripped titles are not visible in bout results, so very recent changes can lag.