Recent polling in São Paulo, Brazil’s largest electoral college, shows Flávio Bolsonaro (PL) leading or tied with incumbent President Lula (PT) in first-round voting intentions, with the senator at 34-45% and the president at 31-40% across Quaest, Datafolha, Real Time Big Data, and AtlasIntel surveys conducted in September. Traders appear to price in Bolsonaro’s consolidation of conservative support in the state, his father Jair Bolsonaro’s political legacy, and Lula’s elevated rejection rates locally. Fragmented support for minor candidates such as Augusto Cury, Ronaldo Caiado, and Renan Santos further reduces the chance of an upset. With the October 4 first round nine days away, late shifts among undecided voters or unusually high turnout among specific blocs represent the main variables that could still alter the outcome.