United Kingdom · national · timing
Next UK by-election called by…?
Next UK by-election called by…?
THE RACE OVER TIME
How the markets have moved
Historical prices retain each source’s metric: Kalshi daily bid/ask midpoint, Polymarket outcome price, and ForecastEx daily close. Gemini and PredictIt show stored daily bid/ask observations where older provider history is unavailable. ForecastEx file dates use a 12:00 UTC display anchor. Lines join available observations; missing dates are not filled.
Accessible chart data
| Source | Outcome | UTC time | Price |
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Select up to four outcomes to compare their histories. Listings can represent people, parties, election dates or leadership changes; they do not establish candidacy or eligibility. Prices from separate contracts are not averaged. Nomination and general-election odds answer different questions.
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Names are matched only by case, spacing and punctuation. Provider-specific wording and resolution rules remain available through each contract link. Market listings reflect the verified catalog dated 2026-10-25.
Understanding this election’s prices
These contracts concern “Next UK by-election called by…?”. Question type: timing. We retain the original provider questions and settlement rules. Winning an election, leading a government, leaving office and calling an election are separate outcomes. Regional results do not establish a national winner.
The outcome list represents provider listings. A party market is not a direct popular election for prime minister. Contract prices may reflect different deadlines and settlement criteria; read the rules before comparing them. No prices are converted into vote shares.
Contract catalog checked 2026-10-25. Read the full methodology ↗
Original contract rules
Polymarket · October 31
This market will resolve to "Yes" if a writ calling for a parliamentary by-election in a UK parliamentary constituency is issued by the UK Clerk of the Crown in Chancery by the specified date, 11:59 PM ET. Otherwise, this market will resolve to "No". The issuance of a writ must be confirmed within the specified timeframe to qualify. Only a writ issued after market creation will count. The writ for the Holborn and St Pancras by-election, issued prior to market creation, will not qualify. The primary resolution source for this market will be official information from the government of the United Kingdom, including the UK Parliament and the relevant local government conducting the election; however a consensus of credible reporting will also be used.
Original contract ↗Polymarket · December 31
This market will resolve to "Yes" if a writ calling for a parliamentary by-election in a UK parliamentary constituency is issued by the UK Clerk of the Crown in Chancery by the specified date, 11:59 PM ET. Otherwise, this market will resolve to "No". The issuance of a writ must be confirmed within the specified timeframe to qualify. Only a writ issued after market creation will count. The writ for the Holborn and St Pancras by-election, issued prior to market creation, will not qualify. The primary resolution source for this market will be official information from the government of the United Kingdom, including the UK Parliament and the relevant local government conducting the election; however a consensus of credible reporting will also be used.
Original contract ↗