Will Partido dos Trabalhadores (PT) hold the most seats as a result of the next Brazilian Senate election?

PT's 7¢ price reflects an extremely bearish outlook on the party holding the most Senate seats after October 2026, with an asymmetric 2,841% implied yield for Yes positions versus just 16.1% for No—a massive 177x differential suggesting the market prices in substantial structural headwinds for the left-wing party. The $2.5M open interest combined with zero 24-hour volume and an 11¢ spread indicates illiquidity despite the high stakes, while the 1,437% realized volatility and 2.46 vol ratio signal this is a highly speculative position with outsized price swings. With 171 days to expiry and a Cliff Risk Index of 13, the market appears to be pricing in either strong polling momentum against PT or structural advantages for center-right competitors in the two-thirds Senate turnover.

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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