Jason Herzog

UFC referee · United States · active in the loaded archive 2009–2026. 591 archived assignments, 21 title fights.

Background verified · English Wikipedia ↗

591Archived assignments

21Title fights

54Five-round

52.6%Stoppage rate

45.3%Decision rate

10:50Avg fight time

Verified background

Jason Herzog

Jason Herzog is an American mixed martial arts (MMA) referee. He has officiated for major promotions including the Ultimate Fighting Championship (UFC) and Bellator MMA.

Source · English Wikipedia · CC BY-SA 4.0 ↗

Notable assignments

Title fights, five-round bouts and main events in this referee's loaded archive, linked to the matchup pages.

Main event · LightweightKyle Nelson vs Cristian PérezUFC Fight Night: Buckley vs. Malott · Oct 17, 2026KO/TKO · R1 · 0:27 · Cristian Pérez won Main event · Women's StrawweightLoopy Godínez vs Ketlen SouzaUFC Fight Night: Allen vs. Duncan · Oct 10, 2026Unanimous Decision · R3 · 5:00 · Loopy Godínez won Main event · BantamweightDeiveson Figueiredo vs Payton TalbottUFC 332: Silva vs. Wang · Oct 3, 2026KO/TKO · R1 · 2:09 · Payton Talbott won Main event · Women's StrawweightMelissa Amaya vs Valesca MachadoUFC Fight Night: Rosas Jr. vs. Barcelos · Sep 26, 2026KO/TKO · R2 · 3:19 · Valesca Machado won Main event · Women's BantamweightNorma Dumont vs Ailin PerezUFC Fight Night: Rosas Jr. vs. Barcelos · Sep 26, 2026Unanimous Decision · R3 · 5:00 · Ailin Perez won Five rounds · LightweightArman Tsarukyan vs Mauricio RuffyUFC 331: Van vs. Pantoja 2 · Sep 19, 2026KO/TKO · R1 · 4:56 · Arman Tsarukyan won

Recent assignments

The newest referee-tagged results currently present in the PropBetEdge UFC archive.

Oct 17, 2026Cody Chovancek vs SuYoung YouUFC Fight Night: Buckley vs. MalottSubmission · R3 · 4:19 Oct 17, 2026Kyle Nelson vs Cristian PérezUFC Fight Night: Buckley vs. MalottKO/TKO · R1 · 0:27 Oct 17, 2026Tanner Boser vs Jhonata DinizUFC Fight Night: Buckley vs. MalottKO/TKO · R3 · 4:26 Oct 10, 2026Alice Pereira vs Daria ZhelezniakovaUFC Fight Night: Allen vs. DuncanKO/TKO · R1 · 5:00 Oct 10, 2026Loopy Godínez vs Ketlen SouzaUFC Fight Night: Allen vs. DuncanUnanimous Decision · R3 · 5:00 Oct 10, 2026Francisco Prado vs Ismael BonfimUFC Fight Night: Allen vs. DuncanKO/TKO · R1 · 4:23

Profile details

Structured facts from the loaded archive and, where attached, a verified source. Unavailable facts are omitted rather than guessed.

Full name: Jason Herzog
Role: American mixed martial arts referee
Nationality: United States
Also listed as: mixed martial arts referee
Documented tenure: Documented UFC assignments 2009–2026
Status: Active in the loaded archive
Archive tenure: 2009–2026 · first loaded bout Oct 24, 2009
Most recent bout: Oct 17, 2026
Archived assignments: 591 in the loaded archive — not a career total; historical coverage is still being backfilled
Title fights: 21
Outcomes: 197 KO/TKO · 112 submissions · 268 decisions (49 split) · 12 NC/draws
Average stoppage: 6:29
Background source: English Wikipedia ↗ · verified Sep 7, 2026
Photo: No freely licensed portrait found in approved sources (6 candidates rejected on license or identity).
Reference: English Wikipedia ↗

Related events

Cards this referee worked in the loaded archive.

Oct 2026UFC Fight Night: Buckley vs. MalottRogers Place · Edmonton · Canada Oct 2026UFC Fight Night: Allen vs. DuncanMeta APEX · Las Vegas · USA Oct 2026UFC 332: Silva vs. WangDelta Center · Salt Lake City · USA Sep 2026UFC Fight Night: Rosas Jr. vs. BarcelosMeta APEX · Las Vegas · USA Sep 2026UFC 331: Van vs. Pantoja 2crypto.com Arena · Los Angeles · USA Sep 2026Dana White's Contender Series: Season 10, Week 6Meta APEX · Las Vegas · USA Sep 2026Noche UFC: Silva vs. DelgadoDesert Diamond Arena · Glendale · USA Sep 2026UFC Fight Night: Hooker vs. ParnasseAccor Arena · Paris · France

Assignment archive

Up to 80 recent loaded UFC bouts. Result source links remain attached at row level.

Date	Event	Fight	Result	Round / time	Source
Oct 17, 2026	UFC Fight Night: Buckley vs. Malott	Cody Chovancek vs SuYoung You	Submission SuYoung You won	R3 · 4:19	Official source ↗
Oct 17, 2026	UFC Fight Night: Buckley vs. Malott	Kyle Nelson vs Cristian Pérez	KO/TKO Cristian Pérez won	R1 · 0:27	Official source ↗
Oct 17, 2026	UFC Fight Night: Buckley vs. Malott	Tanner Boser vs Jhonata Diniz	KO/TKO Tanner Boser won	R3 · 4:26	Official source ↗
Oct 10, 2026	UFC Fight Night: Allen vs. Duncan	Alice Pereira vs Daria Zhelezniakova	KO/TKO Alice Pereira won	R1 · 5:00

Important: “fight impact” here means historical context, not causation. A referee does not choose the matchup, fighter styles, skill gap or scheduled length, so finish and decision rates must be interpreted with sample size and those confounders in mind.