Plaid Cymru leads trader consensus at 72.5% implied probability to win the most seats in the 2026 Senedd election, fueled by consistent polling gains in proportional and constituency races amid Welsh Labour's sharp decline to 0.7%. Key drivers include Labour's minority government struggles after the 2024 collapse of its cooperation deal with Plaid Cymru, former First Minister Vaughan Gething's resignation over donation controversies, and new leader Eluned Morgan's inability to reverse falling support. Reform UK's 25.5% reflects its rapid rise in recent YouGov and other surveys, drawing disaffected voters with anti-establishment messaging, while Conservatives, Greens, and Liberal Democrats languish below 0.5% due to fragmented bases. Tight budgets and potential no-confidence votes loom as catalysts.
Experimental AI-generated summary referencing Polymarket data · UpdatedWales Parliamentary Election Winner
Wales Parliamentary Election Winner
Plaid Cymru 73%
Reform UK 26%
Welsh Labour <1%
Welsh Conservatives <1%
$14,676 Vol.
$14,676 Vol.
Welsh Labour
1%
Plaid Cymru
73%
Welsh Conservatives
<1%
Reform UK
26%
Welsh Liberal Democrats
<1%
Welsh Green Party
<1%
Plaid Cymru 73%
Reform UK 26%
Welsh Labour <1%
Welsh Conservatives <1%
$14,676 Vol.
$14,676 Vol.
Welsh Labour
1%
Plaid Cymru
73%
Welsh Conservatives
<1%
Reform UK
26%
Welsh Liberal Democrats
<1%
Welsh Green Party
<1%
This market will resolve according to the political party that wins the greatest number of seats in the Welsh Parliament (Senedd) in this election.
If voting in the Welsh parliamentary election does not occur by December 31, 2026, 11:59 PM ET, this market will resolve to "Other".
In the event of a tie between multiple parties for the most seats won, this market will resolve in favor of the party or coalition which received a greater number of valid votes. In the event that results in a tie, this market will resolve in favor of the party or coalition whose listed abbreviation appears first in alphabetical order.
This market's resolution will be based solely on the number of seats won by the named party or coalition in the Welsh Parliament.
This market will resolve based on the results of this election as indicated by a consensus of credible reporting. If there is ambiguity, this market will resolve based solely on the official results as reported by the Welsh government, specifically the Senedd Commission of Wales (https://senedd.wales/).
Market Opened: Dec 12, 2025, 6:22 PM ET
Resolver
0x2F5e3684c...Resolver
0x2F5e3684c...Plaid Cymru leads trader consensus at 72.5% implied probability to win the most seats in the 2026 Senedd election, fueled by consistent polling gains in proportional and constituency races amid Welsh Labour's sharp decline to 0.7%. Key drivers include Labour's minority government struggles after the 2024 collapse of its cooperation deal with Plaid Cymru, former First Minister Vaughan Gething's resignation over donation controversies, and new leader Eluned Morgan's inability to reverse falling support. Reform UK's 25.5% reflects its rapid rise in recent YouGov and other surveys, drawing disaffected voters with anti-establishment messaging, while Conservatives, Greens, and Liberal Democrats languish below 0.5% due to fragmented bases. Tight budgets and potential no-confidence votes loom as catalysts.
Experimental AI-generated summary referencing Polymarket data · Updated



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