Trader sentiment strongly favors EH Bildu at 94.5 percent implied probability for the Gipuzkoa seat, driven by the party's entrenched position in Basque nationalist strongholds and consistent outperformance in provincial voting patterns. National parties including PSOE at 5.5 percent and PP at 0.5 percent lag due to weaker local resonance compared with regional priorities. EH Bildu's organizational reach and voter consolidation around Basque-specific platforms sustain the lead, while minor contenders such as Vox and PNV register limited traction. Scenarios that could alter the outcome include sudden shifts in turnout, new coalition signals from other Basque groups, or late developments affecting nationalist voter preferences before resolution.