What happened
Andy Burnham officially became the UK's Prime Minister on July 20, 2026, following Keir Starmer's resignation as Labour leader and Prime Minister. Burnham became the 59th Prime Minister and the seventh to occupy the office in a decade, having been elected Labour leader unopposed with support from 379 of 403 Labour MPs. He pledged to serve as a "circuit-breaker" for the country, promising new political and economic models and greater stability after a period of repeated leadership changes.
Sources: abcnews.com · npr.org · cnbc.com · cfr.org
Written Jul 24, 2026 from news coverage · final prices in the table below
| Outcome |  Polymarket |  Kalshi | Spread |
|---|---|---|---|
Andy BurnhamWinner | 100%— | 100%settled | - |
 Rachel Reeves | 0%settled | 0%settled | - |
 OG Anunoby Jr. | 0%— | - | - |
 Lucy Powell | 0%— | 0%settled | - |
 Ed Miliband | 0%— | 0%settled | - |
 Kemi Badenoch | 0%— | 0%settled | - |
 Yvette Cooper | 0%— | 0%settled | - |
 Wes Streeting | 0%— | 0%settled | - |
 Robert Jenrick | 0%— | - | - |
 Bridget Phillipson | 0%— | - | - |
 David Lammy | 0%— | 0%settled | - |
 Angela Rayner | 0%— | 0%settled | - |
 James Cleverly | 0%— | - | - |
 John Healey | 0%— | - | - |
 Ed Davey | 0%— | - | - |
 Darren Jones | 0%— | 0%settled | - |
 No Next PM in 2026 | 0%— | - | - |
 Al Carns | 0%— | 0%settled | - |
 Shabana Mahmood | 0%— | 0%settled | - |
 Nigel Farage | 0%— | 0%settled | - |
 Boris Johnson | 0%— | - | - |
 Rupert Lowe | 0%settled | 0%settled | - |
Background, methodology, and platform context
Next UK Prime Minister has resolved with Andy Burnham as the winner. $14.73M was traded across Polymarket and Kalshi on 22 outcomes. This page preserves the final odds comparison for historical reference.
Descriptions normalized for comparison (outcome names replaced with [OUTCOME])
This market will resolve to the next individual who is officially appointed as Prime Minister of the United Kingdom by December 31, 2026, 11:59 PM ET. To count for resolution, the individual must be officially appointed by the United Kingdom Monarch. Any interim or caretaker Prime Minister will not count toward the resolution of this market. If no such Prime Minister is appointed by December 31, 2026, 11:59 PM ET, this market will resolve to “No Next PM in 2026”. The primary resolution source for this market will be official information from the Government of the United Kingdom; however, a consensus of credible reporting may also be used.
If Al Carns is the next Prime Minister of the United Kingdom before Jan 1, 2030, then the market resolves to Yes.
Different platforms may use different resolution criteria, data sources, and settlement timelines.
