EH Bildu leads the Biscay winner market at 69% trader consensus, reflecting a late-October 2026 Sociómetro poll from the Basque Government projecting the party at 25.9% and three of eight seats in the province. This marks a gain of one seat from 2023, driven by stronger support among Basque nationalist voters and transfers from smaller left-leaning lists. PNV and PSOE trail closely in the same survey at roughly 25% and 24.7% respectively, each projected for two seats, while PP holds one. The November 29 snap general election, called amid housing policy disputes, has accelerated these shifts in the Biscay constituency, where EH Bildu has overtaken the traditional PNV stronghold. Market pricing aligns with this polling trend and the narrow path for challengers to close the gap before election day.