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| Champion | Won | Lost | Days |
|---|---|---|---|
| Anthony Olascuaga | 20 Jul 2024 | Current | 822 |
| Jesse Rodriguez | 8 Apr 2023 | 29 Mar 2024 | 356 |
| Junto Nakatani | 6 Nov 2020 | 27 Oct 2022 | 720 |
| Kosei Tanaka | 24 Sept 2018 | 31 Jan 2020 | 494 |
| Sho Kimura | 28 Jul 2017 | 24 Sept 2018 | 423 |
| Zou Shiming | 5 Nov 2016 | 28 Jul 2017 | 265 |
| Juan Francisco Estrada | 6 Apr 2013 | 14 Sept 2016 | 1,257 |
| Brian Viloria | 16 Jul 2011 | 6 Apr 2013 | 630 |
| Julio César Miranda | 12 Jun 2010 | 16 Jul 2011 | 399 |
| Fernando Montiel | 15 Dec 2000 | 22 Jun 2002 | 554 |
| Isidro García | 18 Dec 1999 | 15 Dec 2000 | 363 |
| Rubén Sánchez León | 14 Aug 1998 | 23 Apr 1999 | 252 |
| Carlos Gabriel Salazar | 13 Dec 1996 | 14 Aug 1998 | 609 |
| Alberto Jiménez | 11 Feb 1995 | 13 Dec 1996 | 671 |
| Jacob Matlala | 15 May 1993 | 11 Feb 1995 | 637 |
| Pat Clinton | 18 Mar 1992 | 15 May 1993 | 423 |
| Isidro Pérez | 18 Aug 1990 | 18 Mar 1992 | 578 |
Built from title bouts on record. Vacated or stripped titles are not visible in bout results, so very recent changes can lag.