Will Partido da Social Democracia Brasileira (PSDB) hold the most seats as a result of the next Brazilian Senate election?

The PSDB is priced at an extremely depressed 3¢ with a massive 6914% implied yield on the Yes side, suggesting near-zero conviction in the market despite the party's historical relevance in Brazilian politics. With zero 24-hour volume and only $3,206 in open interest against a 6¢ spread, this is an illiquid market vulnerable to manipulation or mispricing, particularly given the 171-day timeframe allows substantial political shifts before the October 2026 election. The elevated Cliff Risk Index of 32 and the asymmetric yield structure (6914% vs 6.6%) indicate this is likely a speculative or abandoned position rather than a serious probability assessment of PSDB's Senate prospects.

Resolution rules

The next federal Senate election is scheduled to take place in Brazil on October 4, 2026, in which two-thirds of the Senate’s 81 seats will be contested. This market will resolve according to the political party that holds the greatest number of seats in the next Brazilian Senate as a result of the next Brazilian Senate election. All seats, not only the ones contested in the next Brazilian Senate election, will be considered. In the event of a tie between multiple parties for the most seats held, this market will resolve in favor of the party whose listed abbreviation appears first in alphabetical order. This market's resolution will be based solely on the number of seats held by the named party in the Brazilian Senate as a result of the next Brazilian Senate election, not by any federation or coalition it may be a part of. If the result of this election isn't known definitively 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) or the Brazilian Senate (https://www25.senado.leg.br/web/senadores/em-exercicio/-/e/por-partido).

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