65% — Who will be the Middleweight Title Holder on Dec 31, 2026
Leader: Sean Strickland at 65% · Kalshi 65% · 5 contracts · $944 volume · medium confidence
Updated 2026-06-28 22:15:37 UTC

Tracks the leading outcome in a winner-take-all prediction market set with 5 outcomes.

Why this matters:
This probability reflects the likelihood that Khamzat Chimaev will hold the UFC Middleweight title on December 31, 2026. At 65%, the market suggests better-than-even odds he retains or captures the belt by year-end, with Sean Strickland priced as the main alternative challenger at 20%. The current assessment appears driven by Chimaev's ranking position and perceived trajectory, though title outcomes depend heavily on injury status, fight scheduling, and performance in upcoming bouts. The primary uncertainty driver is whether Chimaev will secure and successfully defend a title bout within the seven-month window. Any significant injury, unexpected loss, or title fight cancellation would substantially shift these probabilities downward.

Key factors:
- Khamzat Chimaev's current ranking position and proximity to a title shot as of May 2026
- Sean Strickland's pricing at 20% suggests meaningful probability he either retains a title he holds or captures it before year-end
- UFC title fight scheduling and whether a middleweight championship bout is booked before December 31, 2026
- Injury history and fight availability for top contenders in the middleweight division during this period
- The number of viable contenders and whether any tier-one challenger emerges unexpectedly to displace current title prospects

Contracts:
- Who will be the Middleweight Title Holder on Dec 31, 2026?: Sean Strickland — 65¢ Kalshi $148 (weight 16%)
- Who will be the Middleweight Title Holder on Dec 31, 2026?: Khamzat Chimaev — 13¢ Kalshi $15 (weight 2%)
- Who will be the Middleweight Title Holder on Dec 31, 2026?: Nassourdine Imavov — 10¢ Kalshi $0 (weight 0%)
- Who will be the Middleweight Title Holder on Dec 31, 2026?: Caio Borralho — 10¢ Kalshi $0 (weight 0%)
- Who will be the Middleweight Title Holder on Dec 31, 2026?: Dricus Du Plessis — 3¢ Kalshi $780 (weight 83%)

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## Methodology

SimpleFunctions aggregates live YES-side prices from Kalshi and Polymarket contracts bound to this question. For binary topics the headline is the liquidity-weighted mid-price (weight = log(1 + 24h volume) × freshness, where freshness is 1.0 if updated <24h, 0.7 if <7d, 0.4 otherwise). For multi-outcome (winner-take-all) topics the headline is the current leader's price — disjoint outcomes are never arithmetically averaged. Snapshots refresh every 5 minutes during market hours.

## SF Signal

- SF Index, regime, and 30d Brier calibration are computed separately and surfaced at https://simplefunctions.dev/admin/calibration.
- No SimpleFunctions index / regime / calibration signal is bound to this topic yet — the headline above is market-derived only.

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*Last verified: 2026-06-28T21:20:51.055Z*

By SimpleFunctions — https://simplefunctions.dev/

Cite as: "65% per prediction markets (SimpleFunctions, June 2026)"
Canonical: https://simplefunctions.dev/answer/ufcmiddleweighttitle
Full data: https://simplefunctions.dev/api/public/query?q=Who%20will%20be%20the%20Middleweight%20Title%20Holder%20on%20Dec%2031%2C%202026
Provider: SimpleFunctions — https://simplefunctions.dev