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Democratic Senate contracts climb as large Kalshi purchase marks trading

Polymarket contract on Democratic Senate control rose 4 cents to 72.5 cents and Kalshi rose 4 cents to 71 cents on Friday, four days before the November 3 midterms, FinancialMarkets reported. The largest single trade was a 50,000-contract purchase of Kalshi Democratic side at 71 cents at 12:19 PM Eastern, while House control contracts traded around 93 cents on both platforms.

According to FinancialMarkets, contracts tied to Democratic Senate control advanced on both Polymarket and Kalshi on Friday, lifting implied probabilities above 70 percent on each platform.

Polymarket’s contract gained 4 cents to reach 72.5 cents, while Kalshi’s increased by the same amount to 71 cents. The moves left Polymarket pricing Democratic control 1.5 cents higher than Kalshi.

Senate pricing moves closer to House levels

The largest single transaction was a purchase of 50,000 contracts on Kalshi’s Democratic side at 71 cents, executed at 12:19 PM Eastern, according to FinancialMarkets. The summary does not identify the buyer or establish whether that purchase drove the broader price change.

House control contracts, meanwhile, traded around 93 cents on both platforms. Those prices remained substantially above the Senate contracts despite the Senate gains.

FinancialMarkets’ report was published Nov 1, 2026, at 5:15 PM ET. Its summary describes Friday’s trading as occurring four days before the November 3 midterms; the supplied material does not reconcile those timing references.

What it means for prediction markets

  • Both venues recorded a 4-cent Senate gain, showing a similar directional shift despite their different closing price levels.
  • The 50,000-contract Kalshi purchase is a notable transaction, but the supplied figures do not establish overall volume or market depth.
  • Senate pricing remained below House pricing, indicating a meaningful difference in the outcomes priced by the contracts.
  • The timing discrepancy warrants caution when placing these moves on an election countdown.
KalshiPolymarketSenateInfiniti MarketsInfiniti Signals

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