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| Champion | Won | Lost | Days |
|---|---|---|---|
| Angelo Leo | 10 Aug 2024 | Current | 802 |
| Kiko Martínez | 13 Nov 2021 | 26 Mar 2022 | 133 |
| Josh Warrington | 19 May 2018 | 21 Jan 2021 | 978 |
| Lee Selby | 30 May 2015 | 19 May 2018 | 1,085 |
| Evgeny Gradovich | 1 Mar 2013 | 30 May 2015 | 820 |
| Billy Dib | 29 Jul 2011 | 1 Mar 2013 | 581 |
| Yuriorkis Gamboa | 11 Sept 2010 | 26 Mar 2011 | 196 |
| Cristóbal Cruz | 23 Oct 2008 | 15 May 2010 | 569 |
| Robert Guerrero | 23 Feb 2007 | 23 Jun 2008 | 486 |
| Manuel Medina | 16 Nov 2001 | 27 Apr 2002 | 162 |
| Mbulelo Botile | 16 Dec 2000 | 6 Apr 2001 | 111 |
| Paul Ingle | 13 Nov 1999 | 16 Dec 2000 | 399 |
| Manuel Medina | 24 Apr 1998 | 13 Nov 1999 | 568 |
| Hector Lizarraga | 13 Dec 1997 | 24 Apr 1998 | 132 |
| Manuel Medina | 12 Aug 1991 | 26 Feb 1993 | 564 |
| Jorge Páez | 4 Aug 1988 | 14 Mar 1991 | 952 |
| Antonio Rivera | 30 Oct 1986 | 23 Jan 1988 | 450 |
| Chung Ki-young | 29 Nov 1985 | 30 Oct 1986 | 335 |
| Oh Min-keun | 4 Mar 1984 | 29 Nov 1985 | 635 |
Built from title bouts on record. Vacated or stripped titles are not visible in bout results, so very recent changes can lag.