42% — Will Flávio Bolsonaro win the first round of the 2026 Brazilian presidential election
Kalshi 42% · 2 contracts · $7 volume · low confidence
Updated 2026-06-26 01:51:00 UTC

Why this matters:
This probability reflects market expectations that Flávio Bolsonaro will receive the most votes in Brazil's first-round presidential voting on October 2, 2026, without winning outright (requiring a runoff). The 19% assessment sits notably below frontrunner Lula at 42% but above other major candidates, positioning Bolsonaro as a secondary contender in current market sentiment. Key drivers include Flávio's political positioning as the primary Bolsonaro family representative after Jair's legal challenges, his base of support among conservative voters, and the fragmentation of Brazil's electoral landscape. The probability could shift significantly based on polling movements closer to the election, any major political developments affecting the Bolsonaro family's viability, or changes in voter consolidation patterns as candidates enter or withdraw from the race.

Key factors:
- Current polling aggregates show Flávio trailing Lula substantially but competitive with other major candidates in first-round vote-share scenarios
- Flávio's campaign viability depends partly on whether legal or political obstacles prevent his candidacy or significantly damage his support base
- Electoral consolidation patterns remain fluid; candidate dropout decisions and voter realignment in the final months could substantially alter first-round dynamics
- The Bolsonaro family's political capital and voter loyalty following the 2022 election and subsequent developments continue to shape his ceiling and floor

Contracts:
- Will Luiz Inácio Lula da Silva win the first round of the 2026 Brazilian presidential election?: Luiz Inácio Lula da Silva — 75¢ Kalshi $7 (weight 100%)
- Will Flávio Bolsonaro win the first round of the 2026 Brazilian presidential election?: Flávio Bolsonaro — 8¢ Kalshi $0 (weight 0%)

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## Methodology

SimpleFunctions aggregates live YES-side prices from Kalshi and Polymarket contracts bound to this question. For binary topics the headline is the liquidity-weighted mid-price (weight = log(1 + 24h volume) × freshness, where freshness is 1.0 if updated <24h, 0.7 if <7d, 0.4 otherwise). For multi-outcome (winner-take-all) topics the headline is the current leader's price — disjoint outcomes are never arithmetically averaged. Snapshots refresh every 5 minutes during market hours.

## SF Signal

- SF Index, regime, and 30d Brier calibration are computed separately and surfaced at https://simplefunctions.dev/admin/calibration.
- No SimpleFunctions index / regime / calibration signal is bound to this topic yet — the headline above is market-derived only.

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*Last verified: 2026-06-26T01:20:50.486Z*

By SimpleFunctions — https://simplefunctions.dev/

Cite as: "42% per prediction markets (SimpleFunctions, June 2026)"
Canonical: https://simplefunctions.dev/answer/brpres1r
Full data: https://simplefunctions.dev/api/public/query?q=Will%20Fl%C3%A1vio%20Bolsonaro%20win%20the%20first%20round%20of%20the%202026%20Brazilian%20presidential%20election
Provider: SimpleFunctions — https://simplefunctions.dev