- Will SER hold 56-58 French Senate seats after the 2026 election?16¢
- Will SER hold 62-64 French Senate seats after the 2026 election?29¢
- Will SER hold fewer than 56 French Senate seats after the 2026 election?4¢
- Will SER hold 59-61 French Senate seats after the 2026 election?30¢
- Will SER hold 65-67 French Senate seats after the 2026 election?16¢
- Will SER hold 68-70 French Senate seats after the 2026 election?<1¢
- Will SER hold 71 or more French Senate seats after the 2026 election?2¢
The 2026 French Senate election is scheduled for September 27, 2026, renewing série 2 — 178 of the Senate's 348 seats. The new senators are currently scheduled to take office on October 1, 2026, and the deadline for submitting new political-group membership lists and political declarations is currently set for October 5, 2026, at 4:00 PM CEST. This market will resolve according to the number of French Senate seats held by the Groupe Socialiste, Écologiste et Républicain (SER) as of October 12, 2026, 4:00 PM CEST. The seat count will be the group's total membership as published by the French Senate (senat.fr), counting members (membres), related (apparentés), and affiliated (rattachés). A group will qualify as the Groupe Socialiste, Écologiste et Républicain (SER) if it satisfies at least one of the following: - Its official name includes "Socialiste, Écologiste et Républicain" or a clear variant thereof; - Its political declaration published in the Official Journal (Journal Officiel) of France identifies it as a continuation of the group; or - It is publicly recognized as the continuation of the Groupe Socialiste, Écologiste et Républicain (SER), and this characterization is confirmed by a consensus of credible reporting. A group that changes its name will continue to qualify if it meets at least one of the criteria above. If the group merges with one or more other groups, this market will resolve according to the total membership of the merged group, provided the merged group meets at least one of the criteria above. If no group qualifies, or group composition is not officially published, as of October 12, 2026, 4:00 PM CEST, this market will resolve to the lowest bracket. The administrative meeting of senators not appearing on the list of any group (RASNAG) will not qualify as a group for the purposes of this market. The resolution source for this market will be publications of the French Senate (senat.fr) and the Official Journal of France, and a consensus of credible reporting.
The upcoming September 27, 2026, partial renewal of 178 French Senate seats hinges on an electoral college dominated by municipal councilors whose composition was set by the March 2026 local elections. The SER group currently holds 64 seats overall, with 30 of those up for renewal across 63 departments and overseas districts. Traders see the post-election total clustering tightly between 59-64 because right-leaning and centrist lists are projected to hold most of their ground while left-leaning representation faces fragmentation and modest RN gains that could siphon some support. Any late consolidation among socialist or ecologist candidates, shifts in apparentements, or stronger-than-expected local turnout in key proportional-representation departments could push SER above or below that narrow band before group declarations close in early October.