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The Mato Grosso do Sul gubernatorial election is scheduled to take place in Brazil on October 4, 2026, with a runoff on October 25, 2026, if no candidate receives a majority of the valid votes in the first round. This market will resolve according to the candidate who wins this election. Temporary, interim, or placeholder governors appointed by any means before the specified election will not be considered. If the result of this election isn't known by June 30, 2027, 11:59 PM ET, the market will resolve to "Other". This market will resolve based on the result of the 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 Brazilian government, specifically the Superior Electoral Court (Tribunal Superior Eleitoral, TSE) (e.g., www.tse.jus.br/eleicoes/resultados-eleicoes).
Eduardo Riedel, the incumbent governor seeking re-election under the PP banner with a broad center-right coalition, maintains a commanding lead in recent polling for the October 4 first-round vote in Mato Grosso do Sul. Surveys from late August and early September, including AtlasIntel, show him at 49% of voting intentions—sufficient in some estimates to secure an outright win—while main challenger Fábio Trad (PT) trails at 26% and João Henrique Catan (Novo) at around 12%. This positioning reflects Riedel's established administrative record, approval ratings near 51%, and fragmented opposition. Traders price him at 97.1% as the consensus outcome, though a narrow path remains for shifts from undecided voters or unexpected late developments before the October runoff window if needed.