Prices for When will the next UK parliamentary by-election be called on Kalshi. A price of 41¢ means traders on that platform price the outcome at about 41%. It is a market price, not a forecast by PolyKal.
Independent research, not affiliated with Polymarket or Kalshi. Not trading advice. PolyKal stops updating prices before the first polls open and does not report election results.
| Option | KKalshi |
|---|---|
| Before Apr 1, 2027 | 55.0¢ |
| Before Jan 1, 2027 | 34.0¢ |
| Before Jan 1, 2028 | 84.0¢ |
| Before Jul 1, 2027 | 81.0¢ |
| Before Nov 1, 2026 | 6.0¢ |
Only listed on Kalshi.
Official rule text (Kalshi lists one market per option with the same wording; shown here for the Before Nov 1, 2026 market)
If a writ for a UK parliamentary by-election is issued by the relevant Clerk of the Crown after Issuance and before Nov 1, 2026, then the market resolves to Yes. Only reporting from the Clerk of the Crown in Chancery and the Clerk of the Crown for Northern Ireland qualifies for the purposes of this market. Reports that merely reference prior publications (from before Issuance) do not qualify. Republishing of content originally produced by other sources (e.g., wire services) only qualifies if the content is hosted on the outlet's official platform and the outlet is clearly identified as the publishing entity.
PolyKal stops updating prices before the first polls open and does not report election results. Prices use the same method as the Midterms pages: Polymarket shows the market's displayed Yes price. Kalshi shows the midpoint of the highest Yes bid and the lowest Yes ask when they are within 8¢ of each other, and otherwise the highest Yes bid. Options with no Yes bid show —.
Available from 16 October 2026.
Available from 24 November 2026. Bid, ask, spread, order book depth and open interest for each option.
Available from 24 November 2026. Notes on large price moves, with the facts reported in the same period.
Available from 20 October 2026. One row per option, per day, Polymarket prices only (CSV).
Each platform resolves its market on the official result named in its own rules. The rule text is quoted on this page.
No. This election is only listed on Kalshi right now, so the page shows Kalshi prices and rules without a cross-platform comparison.
Every priced option in the market is listed in alphabetical order. The list follows the market, not an official candidate list.
No. PolyKal stops updating prices before the first polls open and keeps the last pre-election prices as a snapshot. It does not report election results.
Every 15 minutes until prices stop updating before the vote.
Prices for When will the next UK parliamentary by-election be called on Kalshi. A price of 41¢ means traders on that platform price the outcome at about 41%. It is a market price, not a forecast by PolyKal.
Independent research, not affiliated with Polymarket or Kalshi. Not trading advice. PolyKal stops updating prices before the first polls open and does not report election results.
| Option | KKalshi |
|---|---|
| Before Apr 1, 2027 | 55.0¢ |
| Before Jan 1, 2027 | 34.0¢ |
| Before Jan 1, 2028 | 84.0¢ |
| Before Jul 1, 2027 | 81.0¢ |
| Before Nov 1, 2026 | 6.0¢ |
Only listed on Kalshi.
Official rule text (Kalshi lists one market per option with the same wording; shown here for the Before Nov 1, 2026 market)
If a writ for a UK parliamentary by-election is issued by the relevant Clerk of the Crown after Issuance and before Nov 1, 2026, then the market resolves to Yes. Only reporting from the Clerk of the Crown in Chancery and the Clerk of the Crown for Northern Ireland qualifies for the purposes of this market. Reports that merely reference prior publications (from before Issuance) do not qualify. Republishing of content originally produced by other sources (e.g., wire services) only qualifies if the content is hosted on the outlet's official platform and the outlet is clearly identified as the publishing entity.
PolyKal stops updating prices before the first polls open and does not report election results. Prices use the same method as the Midterms pages: Polymarket shows the market's displayed Yes price. Kalshi shows the midpoint of the highest Yes bid and the lowest Yes ask when they are within 8¢ of each other, and otherwise the highest Yes bid. Options with no Yes bid show —.
Available from 16 October 2026.
Available from 24 November 2026. Bid, ask, spread, order book depth and open interest for each option.
Available from 24 November 2026. Notes on large price moves, with the facts reported in the same period.
Available from 20 October 2026. One row per option, per day, Polymarket prices only (CSV).
Each platform resolves its market on the official result named in its own rules. The rule text is quoted on this page.
No. This election is only listed on Kalshi right now, so the page shows Kalshi prices and rules without a cross-platform comparison.
Every priced option in the market is listed in alphabetical order. The list follows the market, not an official candidate list.
No. PolyKal stops updating prices before the first polls open and keeps the last pre-election prices as a snapshot. It does not report election results.
Every 15 minutes until prices stop updating before the vote.