Flávio Bolsonaro win the second round of the 2026 Brazilian presidential election by less than 4% priced at 46.5% on Polymarket, up 7 points, on $426K traded

A Polymarket contract on Flávio Bolsonaro winning the second round of the 2026 Brazilian presidential election by less than 4% was priced at 46.5%, up 7 probability points over 24 hours, with $426K traded in the Oct 19, 2026 update.

According to PredictionBubbles, the contract appeared among upward moves in its political/election category. The question concerns a specific winning margin, rather than simply whether Bolsonaro will win the election.

How the move is measured

PredictionBubbles ranks contracts by the size of their 24-hour probability-point changes, not their relative percentage gains. Its board draws prices from Polymarket and Kalshi every 15 minutes; the supplied snapshot records venue data retrieved on 19 Oct 2026, 22:46 UTC.

The board’s eligible universe covered 2,036 markets lasting longer than 14 days. Only open contracts with a valid day-earlier price comparison qualify for the ranking, according to PredictionBubbles. Trading volume and liquidity provide context but do not affect a contract’s position.

What the available data establish

The 7-point increase shows that traders assigned a higher price to a narrow Bolsonaro victory than they had a day earlier. The supplied material does not identify a poll, announcement or other specific catalyst for the change.

The $426K traded figure adds activity context, but the supplied contract details do not establish order-book depth or specify the period covered by that volume. The price move alone therefore cannot show how broadly supported the repricing was.

What it means for prediction markets

• The margin condition matters: The 46.5% price applies to a Bolsonaro second-round victory by less than 4%, not to his overall chance of winning.
• The change is measured in points: The reported increase is 7 probability points over 24 hours, not a 7% relative gain.
• Activity is not liquidity: The $426K traded figure does not, by itself, establish how much buying or selling the market could absorb without moving.
• The catalyst remains unspecified: The board documents a repricing, but the supplied material does not explain what drove it.