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.
Robert Whittaker defeats Yoel Romero on 17-07-08 in Las Vegas, NV for interim title.
Georges St-Pierre
2017-11-04
New York, NY
Defeats Bisping; vacates on 17-12-07 due to ulcerative colitis.
Robert Whittaker
2017-12-07
Promoted to undisputed champion when St-Pierre vacates the title; Yoel Romero defeats Luke Rockhold on 2018-02-11 in Perth, WA, AUS but is ineligible to win the interim title due to exceeding the weight limit; Israel Adesanya defeats Kelvin Gastelum on 19-04-13 in Atlanta, GA for iterim title.
