Will MDB hold 1st seats in Senate after the 2026 Brazilian Senate Election
Liquidity-weighted aggregate sits at 42% across 2 Kalshi contracts.
Implied probability
Kalshi
42%
2 contracts
Polymarket
—
not bound
Cross-venue gap
—
single venue
24h move
—
no pin
24h volume
$3K
2 contracts
Closes
Oct 4, 2027
421 days
30-day trend
Bracket families
2 clusters across 2 contracts.
These contracts were grouped by title similarity. The headline aggregate combines all clusters; verify the cluster you actually need before quoting a number.
Cluster 1
Will PL hold 1st seats in Senate after the 2026 Brazilian Senate Election
Will PL hold 1st seats in Senate after the 2026 Brazilian Senate Election?: PL
KXBRSENMOSTSEATS-26OCT04-PL
Cluster 2
Will MDB hold 1st seats in Senate after the 2026 Brazilian Senate Election
Will MDB hold 1st seats in Senate after the 2026 Brazilian Senate Election?: MDB
KXBRSENMOSTSEATS-26OCT04-MDB
Analysis
This probability indicates that markets give MDB a 31% chance of winning the most Senate seats in Brazil's 2026 election, compared to PL's 79% probability. MDB is currently the third-largest party by this market's assessment, behind PL and União Progressista. The outcome depends primarily on voter preference shifts and coalition dynamics leading up to the October 2026 election. Campaign messaging, economic conditions, and how different regional political blocs align will significantly influence final seat distributions. The election itself on October 4, 2026 will definitively resolve this question, though pre-election polling and party alliance announcements in the coming months will gradually clarify the trajectory.
- ›MDB's current market probability of 31% contrasts sharply with PL's 79%, suggesting markets view PL as substantially favored for the largest Senate contingent
- ›Historical Brazilian Senate elections show coalition dynamics and regional strongholds heavily influence seat distribution rather than national popular vote alone
- ›Campaign alliances announced before October 2026 could significantly shift seat projections, as Brazilian parties frequently form tactical voting blocs
- ›Economic conditions and Lula administration approval ratings between July 2026 and October 2026 will likely affect voting behavior and party performance
- ›MDB's traditional strength in specific states and regions remains a quantifiable factor in Senate seat projections
What moved the line
- Aug 8PL↑13pp64→77¢ · Kalshi
- Aug 7PL↓12pp76→64¢ · Kalshi
- Aug 9PL↑4pp77→81¢ · Kalshi
- Aug 5PL↑3pp73→76¢ · Kalshi
- Aug 9MDB↓3pp6→3¢ · Kalshi
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These markets stopped trading. Last odds and any captured outcome are shown above — full settlement detail lives at the venue.
Lateral coverage
Thin contract — here's where the deeper coverage is.
This page aggregates 2 contracts (42% headline). At low contract count, the price reflects two participants’ opinions, not a market consensus. The links below are heavier related questions where the orderbook signal is real.
Thicker comparable contracts
In election 2026
Related reading
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How we compute these odds
SimpleFunctions aggregates live prediction-market contracts from Kalshi and Polymarket. Each slug groups contracts that resolve on the same underlying event, identified by venue event_id.
For binary slugs, the headline probability is the liquidity-weighted mid-price across all bound contracts. For multi-outcome slugs (e.g. elections with 3+ candidates), the headline is the leader’s price; we never arithmetically average disjoint outcomes — that would produce a number with no real-world meaning.
Snapshots refresh every 5 minutes during market hours; daily aggregates are computed at 04:00 UTC. The 30-day sparkline is drawn from per-ticker daily means stored in market_indicator_daily; 24h delta and movement events are derived from the same source.
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