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FightIQ · UFC stats · UFC split decision rate by referee

UFC split decision 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, 9% of UFC fights were split decisions.

How often the judges disagree — split decisions as a share of all UFC fights.
Computed from 7,638 fights · 38 referees · updated 20 October 2026
Split decision 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: 9% (1,258 fights)9%John McCarthyJohn McCarthy: 6% (622 fights)6%Marc GoddardMarc Goddard: 9% (622 fights)9%Dan MiragliottaDan Miragliotta: 8% (498 fights)8%Jason HerzogJason Herzog: 9% (485 fights)9%Mark SmithMark Smith: 10% (460 fights)10%Chris TognoniChris Tognoni: 11% (459 fights)11%Keith PetersonKeith Peterson: 10% (405 fights)10%Mario YamasakiMario Yamasaki: 11% (388 fights)11%Yves LavigneYves Lavigne: 11% (264 fights)11%Mike BeltranMike Beltran: 8% (210 fights)8%Steve MazzagattiSteve Mazzagatti: 4% (199 fights)4%Leon RobertsLeon Roberts: 8% (193 fights)8%Kerry HatleyKerry Hatley: 10% (166 fights)10%Josh RosenthalJosh Rosenthal: 12% (120 fights)12%Kevin MacDonaldKevin MacDonald: 10% (109 fights)10%Jerin ValelJerin Valel: 14% (93 fights)14%Steve PercevalSteve Perceval: 13% (90 fights)13%Jacob MontalvoJacob Montalvo: 8% (79 fights)8%John SharpJohn Sharp: 9% (76 fights)9%Rich MitchellRich Mitchell: 9% (76 fights)9%Lukasz BosackiLukasz Bosacki: 8% (73 fights)8%Kevin MulhallKevin Mulhall: 8% (60 fights)8%Daniel MovahediDaniel Movahedi: 10% (59 fights)10%Blake GriceBlake Grice: 12% (57 fights)12%Osiris MaiaOsiris Maia: 4% (56 fights)4%Gary CopelandGary Copeland: 6% (51 fights)6%Kevin SatakiKevin Sataki: 8% (48 fights)8%Todd Ronald AndersonTodd Ronald Anderson: 20% (45 fights)20%Neil HallNeil Hall: 9% (44 fights)9%Kim WinslowKim Winslow: 10% (42 fights)10%Greg KleynjansGreg Kleynjans: 13% (39 fights)13%Larry LandlessLarry Landless: 5% (37 fights)5%Jim PerdiosJim Perdios: 12% (32 fights)12%Eduardo HerdyEduardo Herdy: 19% (31 fights)19%Fernando PortellaFernando Portella: 6% (31 fights)6%Vitor RibeiroVitor Ribeiro: 6% (31 fights)6%Grant WatermanGrant Waterman: 10% (30 fights)10%
Split decision rate by referee · every value is in the table below, with the number of fights behind it.
RefereeSplit-decision rateSplit decisionsFights
Herb Dean9%1161,258
John McCarthy6%37622
Marc Goddard9%53622
Dan Miragliotta8%40498
Jason Herzog9%45485
Mark Smith10%47460
Chris Tognoni11%49459
Keith Peterson10%39405
Mario Yamasaki11%43388
Yves Lavigne11%30264
Mike Beltran8%16210
Steve Mazzagatti4%8199
Leon Roberts8%16193
Kerry Hatley10%17166
Josh Rosenthal12%14120
Kevin MacDonald10%11109
Jerin Valelsmall sample14%1393
Steve Percevalsmall sample13%1290
Jacob Montalvosmall sample8%679
John Sharpsmall sample9%776
Rich Mitchellsmall sample9%776
Lukasz Bosackismall sample8%673
Kevin Mulhallsmall sample8%560
Daniel Movahedismall sample10%659
Blake Gricesmall sample12%757
Osiris Maiasmall sample4%256
Gary Copelandsmall sample6%351
Kevin Satakismall sample8%448
Todd Ronald Andersonsmall sample20%945
Neil Hallsmall sample9%444
Kim Winslowsmall sample10%442
Greg Kleynjanssmall sample13%539
Larry Landlesssmall sample5%237
Jim Perdiossmall sample12%432
Eduardo Herdysmall sample19%631
Fernando Portellasmall sample6%231
Vitor Ribeirosmall sample6%231
Grant Watermansmall sample10%330
What counts. A split decision is the official record’s own method code (“Decision - Split”); majority decisions are a separate code and are not counted here. The share is of ALL fights, not of decisions only. 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.
Split decision rate — cut another way
Other UFC stat answers