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| Champion | Won | Lost | Days |
|---|---|---|---|
| Bruce Carrington | 31 Jan 2026 | Current | 262 |
| Brandon Figueroa | 18 Oct 2024 | 1 Feb 2025 | 106 |
| Rey Vargas | 9 Jul 2022 | 18 Oct 2024 | 832 |
| Gary Russell Jr. | 28 Mar 2015 | 22 Jan 2022 | 2,492 |
| Jhonny González | 24 Aug 2013 | 28 Mar 2015 | 581 |
| Daniel Ponce de León | 14 Sept 2012 | 4 May 2013 | 232 |
| Jhonny González | 8 Apr 2011 | 14 Sept 2012 | 525 |
| Hozumi Hasegawa | 26 Nov 2010 | 8 Apr 2011 | 133 |
| Elio Rojas | 14 Jul 2009 | 27 Sept 2010 | 440 |
| Óscar Larios | 13 Aug 2008 | 12 Mar 2009 | 211 |
| Jorge Linares | 31 Jul 2007 | 13 Aug 2008 | 379 |
| Chi In-jin | 10 Apr 2004 | 29 Jan 2006 | 659 |
| Paulie Ayala | 16 Nov 2002 | 5 Oct 2003 | 323 |
| Erik Morales | 17 Feb 2001 | 22 Jun 2002 | 490 |
| Naseem Hamed | 22 Oct 1999 | 9 Jan 2000 | 79 |
| Luisito Espinosa | 11 Dec 1995 | 15 May 1999 | 1,251 |
| Kevin Kelley | 4 Dec 1993 | 7 Jan 1995 | 399 |
| Paul Hodkinson | 14 Nov 1991 | 28 Apr 1993 | 531 |
| Marcos Villasana | 2 Jun 1990 | 14 Nov 1991 | 530 |
| Jeff Fenech | 7 Mar 1988 | 18 Apr 1990 | 772 |
| Azumah Nelson | 8 Dec 1984 | 27 Jan 1988 | 1,145 |
| Juan Laporte | 15 Sept 1982 | 31 Mar 1984 | 563 |
| Salvador Sánchez | 2 Feb 1980 | 12 Aug 1982 | 922 |
| Danny Lopez | 13 Nov 1976 | 2 Feb 1980 | 1,176 |
| David Kotei | 20 Sept 1975 | 13 Nov 1976 | 420 |
| Bobby Chacon | 7 Sept 1974 | 20 Jun 1975 | 286 |
| Éder Jofre | 5 May 1973 | 17 Jun 1974 | 408 |
| Clemente Sánchez | 16 Dec 1972 | 5 May 1973 | 140 |
| Kuniaki Shibata | 11 Dec 1970 | 19 May 1972 | 525 |
| Johnny Famechon | 21 Jan 1969 | 9 May 1970 | 473 |
| José Legrá | 24 Jul 1968 | 21 Jan 1969 | 181 |
| Vicente Saldivar | 26 Sept 1964 | 14 Oct 1967 | 1,113 |
| Sugar Ramos | 21 Mar 1963 | 26 Sept 1964 | 555 |
Built from title bouts on record. Vacated or stripped titles are not visible in bout results, so very recent changes can lag.