Following the name of the champion(s): Indicates the number of times the competitor has held that title at that point.
[...]
Indicates a gap in the listing where title changes are not known.
<
Title was held or changed hands no later than this. In these cases, it is known that a competitor held the title at a certain time but not when he/she won it.
@
Order uncertain. Different titleholders may be known for the same year, for example, but it is not known who held the title before whom.
#
Unofficial or disputable claims. These are usually matches that certainly took place, but where there is doubt that the competitor shown should be recognized as a true title holder. These listings are also italicized.
Interim champion since defeating Francisco Rosas on 09-08-15 in Cozumel, MEX; status promoted to the "Regular" world champion on 10-08-28; vacates on 10-11-26 to move up to the flyweight class.
Roman Gonzalez
2011-02-04
Interim champion since defeating Francisco Rosas on 10-10-24 in Tōkyō, JPN; status promoted on 11-02-04; vacant on 12-11-30 when Gonzales is promoted to Super champion.
Ioka Kazuto
2012-12-31
Ōsaka, JPN
Defeats José Alfredo Rodríguez; vacates on 14-02-28 to move up to the flyweight class.
Alberto Rossel
2014-07-08
Interim champion since defeating José Alfredo Rodríguez on 12-04-14 in Lima, PER; status promoted on 14-07-08.
Taguchi Ryōichi
2014-12-31
Tōkyō, JPN
Vacant on 17-12-31 when Taguchi is promoted to Super champion.
Carlos Cañizales
2018-03-18
Kōbe, JPN
Defeats Konishi Reiya.
Esteban Bermudez
2021-05-28
Coyoacán, DF, MEX
Loses to the Super championKyōguchi Hiroto on 22-06-10; title retired.
