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FightIQ · UFC stats · UFC knockout rate by referee

UFC knockout rate by referee

38 UFC referees have worked 30 or more fights on the official record, 7,638 fights between them, and this page lists them by fights officiated, not by rate. Herb Dean has worked the most, 1,258; under Herb Dean, 36% of UFC fights ended by knockout.

How often a UFC fight ends in a knockout — the number itself, not a highlight reel, every bout on the official record since 1994.
Computed from 7,638 fights · 38 referees · updated 20 October 2026
Knockout rate by referee38 bars, one per referee, in order of fights officiated, most first. Grey bars rest on fewer than 100 fights. The table below carries every value.Herb DeanHerb Dean: 36% (1,258 fights)36%John McCarthyJohn McCarthy: 40% (622 fights)40%Marc GoddardMarc Goddard: 34% (622 fights)34%Dan MiragliottaDan Miragliotta: 39% (498 fights)39%Jason HerzogJason Herzog: 33% (485 fights)33%Mark SmithMark Smith: 34% (460 fights)34%Chris TognoniChris Tognoni: 30% (459 fights)30%Keith PetersonKeith Peterson: 30% (405 fights)30%Mario YamasakiMario Yamasaki: 34% (388 fights)34%Yves LavigneYves Lavigne: 30% (264 fights)30%Mike BeltranMike Beltran: 34% (210 fights)34%Steve MazzagattiSteve Mazzagatti: 35% (199 fights)35%Leon RobertsLeon Roberts: 33% (193 fights)33%Kerry HatleyKerry Hatley: 33% (166 fights)33%Josh RosenthalJosh Rosenthal: 28% (120 fights)28%Kevin MacDonaldKevin MacDonald: 33% (109 fights)33%Jerin ValelJerin Valel: 28% (93 fights)28%Steve PercevalSteve Perceval: 32% (90 fights)32%Jacob MontalvoJacob Montalvo: 25% (79 fights)25%John SharpJohn Sharp: 26% (76 fights)26%Rich MitchellRich Mitchell: 26% (76 fights)26%Lukasz BosackiLukasz Bosacki: 30% (73 fights)30%Kevin MulhallKevin Mulhall: 35% (60 fights)35%Daniel MovahediDaniel Movahedi: 29% (59 fights)29%Blake GriceBlake Grice: 30% (57 fights)30%Osiris MaiaOsiris Maia: 32% (56 fights)32%Gary CopelandGary Copeland: 41% (51 fights)41%Kevin SatakiKevin Sataki: 38% (48 fights)38%Todd Ronald AndersonTodd Ronald Anderson: 33% (45 fights)33%Neil HallNeil Hall: 30% (44 fights)30%Kim WinslowKim Winslow: 33% (42 fights)33%Greg KleynjansGreg Kleynjans: 31% (39 fights)31%Larry LandlessLarry Landless: 43% (37 fights)43%Jim PerdiosJim Perdios: 31% (32 fights)31%Eduardo HerdyEduardo Herdy: 26% (31 fights)26%Fernando PortellaFernando Portella: 29% (31 fights)29%Vitor RibeiroVitor Ribeiro: 29% (31 fights)29%Grant WatermanGrant Waterman: 33% (30 fights)33%
Knockout rate by referee · every value is in the table below, with the number of fights behind it.
RefereeKnockout rateKnockoutsFights
Herb Dean36%4551,258
John McCarthy40%248622
Marc Goddard34%209622
Dan Miragliotta39%192498
Jason Herzog33%159485
Mark Smith34%156460
Chris Tognoni30%137459
Keith Peterson30%122405
Mario Yamasaki34%132388
Yves Lavigne30%80264
Mike Beltran34%71210
Steve Mazzagatti35%69199
Leon Roberts33%64193
Kerry Hatley33%55166
Josh Rosenthal28%34120
Kevin MacDonald33%36109
Jerin Valelsmall sample28%2693
Steve Percevalsmall sample32%2990
Jacob Montalvosmall sample25%2079
John Sharpsmall sample26%2076
Rich Mitchellsmall sample26%2076
Lukasz Bosackismall sample30%2273
Kevin Mulhallsmall sample35%2160
Daniel Movahedismall sample29%1759
Blake Gricesmall sample30%1757
Osiris Maiasmall sample32%1856
Gary Copelandsmall sample41%2151
Kevin Satakismall sample38%1848
Todd Ronald Andersonsmall sample33%1545
Neil Hallsmall sample30%1344
Kim Winslowsmall sample33%1442
Greg Kleynjanssmall sample31%1239
Larry Landlesssmall sample43%1637
Jim Perdiossmall sample31%1032
Eduardo Herdysmall sample26%831
Fernando Portellasmall sample29%931
Vitor Ribeirosmall sample29%931
Grant Watermansmall sample33%1030
What counts. A knockout here is any bout the official record ends by KO/TKO, including a doctor’s stoppage, which UFCStats files as its own method. A fight is a UFC bout on the official record with a result. Draws, no-contests and overturned results are excluded from every count on this page; disqualifications and could-not-continues are counted as fights, which is why the knockout, submission and decision shares do not add up to 100%. How this table is cut. Every referee with at least 30 UFC bouts on the official record, listed by fights officiated, most first. This is a list, not a ranking. A referee does not choose the assignments, so these are differences in the fights each one was given as much as in how each one calls them. Small samples. Referees with fewer than 100 fights officiated are greyed and marked small sample. They are shown, not dropped. 1,135 fights are outside this table. They were officiated by a referee with fewer than 30 fights on the record, or carry no referee on the record. They are not missing from our record — they are on the year-by-year archive like every other bout; there is simply no row here for them to sit in. Check us. Every number here is recomputed from the official UFC statistical record on each build — nothing on this page is typed in by hand. Search every fight to filter the same record yourself, or start from the year-by-year archive.
Knockout rate — cut another way
Other UFC stat answers