In this guide
Key finding: The UFC Heavyweight division is one of the most actively traded combat sports prediction markets in the UK. As of July 2026, Polymarket's heavyweight champion market shows Jon Jones as the implied frontrunner at 35–42% probability, with Tom Aspinall (interim champion) at 28–35%, depending on whether you're looking at "who holds the title on 31 Dec 2026" or "who wins the next unification bout."
Mixed martial arts prediction markets have grown rapidly on Polymarket since 2024. For UK fans, the UFC heavyweight picture is uniquely compelling: Tom Aspinall — a Bolton-born fighter — is the interim heavyweight champion and a dominant hometown favourite. This guide explains the current prediction market odds, the platforms available to UK traders, and everything you need to know about trading UFC outcomes.
Current UFC Heavyweight Prediction Market Odds (July 2026)
The prediction market consensus for UFC Heavyweight Champion by end of 2026:
- Jon Jones (Polymarket): 35–42% — If healthy and active, Jones is the betting consensus favourite given his undefeated heavyweight record (excl. one NC)
- Tom Aspinall (Polymarket): 28–35% — Interim champion, dominant finisher, UK favourite. Markets price him as most likely to unify if Jones fights
- Stipe Miocic (Polymarket): 5–8% — Former champion, unlikely path back to title; priced as longshot
- Sergei Pavlovich / Curtis Blaydes / Alexander Volkov (Polymarket): 3–6% each — contender paths requiring multiple wins
The Jones vs Aspinall fight — long delayed — is the most anticipated UFC bout not yet booked. Prediction markets treat it as the most likely resolution to the division's title uncertainty.
Tom Aspinall: The UK Angle in UFC Heavyweight Prediction
Tom Aspinall's rise has generated significant UK-specific prediction market interest — he is the first British UFC champion in a major weight class since Michael Bisping (middleweight, 2016). Key factors driving UK prediction market activity on Aspinall:
- Knockout power: Aspinall finishes opponents faster than any heavyweight in UFC history. Prediction markets price him as a decisive winner if Jones is unavailable.
- Jones uncertainty: Jones's activity level has been unpredictable. Every time Jones withdraws from a fight, Aspinall's prediction market odds spike upward.
- UK fan base: Aspinall fights draw massive UK viewership and generate proportionally higher UK prediction market volume than comparable US fights.
PolyGram: Track Tom Aspinall and Jon Jones UFC odds in real time. PolyGram aggregates Polymarket MMA prediction markets with live order book data. View UFC prediction odds →
How to Trade UFC Prediction Markets From the UK
UK traders have two main routes for UFC prediction markets:
- Polymarket (USDC): The deepest UFC prediction market liquidity. "Who will be UFC heavyweight champion on [date]" contracts resolve based on the official UFC title holder at the stated date. Accessible to UK traders, USDC settlement, HMRC CGT applies.
- Betfair Exchange (GBP): Betfair runs UFC fight-outcome markets (moneyline for individual bouts) rather than long-range prediction contracts. Better for next-fight outcome trading than multi-month prediction positions. UKGC-licensed, typically tax-free winnings for UK individuals.
- Smarkets (GBP): Similar to Betfair for individual UFC bout markets. UKGC-regulated, lower commission than Betfair (2% vs 5%).
For a 6–12 month "who will hold the title" position, Polymarket is the better venue. For specific fight outcome trading, Betfair and Smarkets offer GBP settlement with UKGC protection.
HMRC Tax on UFC Prediction Market Profits
- Betfair/Smarkets (UKGC-licensed): Typically tax-free gambling winnings under current HMRC rules for UK individuals — no CGT, no income tax on winnings from licensed gambling platforms.
- Polymarket (USDC/Polygon): Crypto disposal events subject to HMRC CGT. Each settlement must be tracked in GBP. Keep your Polygon wallet transaction history for HMRC reporting.
Frequently Asked Questions: UFC Heavyweight Prediction Markets UK
Who is favoured to be UFC heavyweight champion in 2026 according to prediction markets?
Jon Jones leads at 35–42% implied probability on Polymarket, with Tom Aspinall (interim champion) at 28–35%. The unification fight between Jones and Aspinall would resolve the division.
Can UK traders use Polymarket for UFC predictions?
Yes. Polymarket is accessible to UK residents. It is not UKGC-licensed, but there are no UK restrictions on its use. Settlement is in USDC on Polygon — profits are subject to HMRC Capital Gains Tax.
Is Betfair available for long-range UFC title prediction (6+ months)?
Betfair Exchange mainly offers individual bout markets rather than long-range title holder contracts. For multi-month "who holds the title on [date]" positions, Polymarket is the better venue.
What is Tom Aspinall's probability of being UFC heavyweight champion by end of 2026?
Prediction markets currently price Aspinall at 28–35% implied probability — making him the second favourite behind Jon Jones. His probability spikes significantly whenever Jones is reported inactive or injured.
Are UFC prediction market profits taxable in the UK?
Profits from UKGC-licensed platforms (Betfair, Smarkets) are typically tax-free gambling winnings. Profits from Polymarket are treated as crypto CGT events. Keep full records and consult a UK tax adviser for personalised guidance.
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