Prices for United Kingdom elections on Polymarket and Kalshi, side by side. 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 | PPolymarket |
|---|---|
| Yes | 10.5¢ |
Only listed on Polymarket.
Official rule text
This market will resolve to "Yes" if a writ calling for a parliamentary by-election in the United Kingdom parliamentary constituency of Clacton is issued by the UK Clerk of the Crown in Chancery between market creation and December 31, 2026, 11:59 PM ET. Otherwise, this market will resolve to "No". Writs issued in connection with a United Kingdom general election will not qualify. The issuance of a writ must be confirmed within the specified timeframe to 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.
| Option | PPolymarket |
|---|---|
| December 31 | 50.0¢ |
| October 31 | 8.0¢ |
Only listed on Polymarket.
Official rule text
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.
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.
The two platforms have different rules for what counts as winning, different fees, different users and different amounts of money in each market.
Options listed on both Polymarket and Kalshi are compared side by side, in alphabetical order. Options listed on only one platform are shown separately, without a gap figure. The list follows the markets, 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 United Kingdom elections on Polymarket and Kalshi, side by side. 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 | PPolymarket |
|---|---|
| Yes | 10.5¢ |
Only listed on Polymarket.
Official rule text
This market will resolve to "Yes" if a writ calling for a parliamentary by-election in the United Kingdom parliamentary constituency of Clacton is issued by the UK Clerk of the Crown in Chancery between market creation and December 31, 2026, 11:59 PM ET. Otherwise, this market will resolve to "No". Writs issued in connection with a United Kingdom general election will not qualify. The issuance of a writ must be confirmed within the specified timeframe to 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.
| Option | PPolymarket |
|---|---|
| December 31 | 50.0¢ |
| October 31 | 8.0¢ |
Only listed on Polymarket.
Official rule text
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.
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.
The two platforms have different rules for what counts as winning, different fees, different users and different amounts of money in each market.
Options listed on both Polymarket and Kalshi are compared side by side, in alphabetical order. Options listed on only one platform are shown separately, without a gap figure. The list follows the markets, 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.