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Democratic Senate contracts climb as large Kalshi purchase draws attention

Polymarket's Democratic Senate control contract rose from 68.5 cents to 72.5 cents on Friday and Kalshi's rose from 67 cents to 71 cents, both up four points four days before the November 3 midterms. The largest single trade was a 50,000-contract purchase of Kalshi's Democratic side at 71 cents at 12:19 p.m. Eastern, with Kalshi trading about 235,000 contracts in the window.

Democratic Senate control contracts gained four points on both Polymarket and Kalshi on Friday, taking implied probabilities above 70 percent, according to FinancialMarkets. The outlet described the moves as coming four days before the November 3 midterms.

Polymarket’s contract advanced from 68.5 cents to 72.5 cents. Kalshi’s Democratic contract moved from 67 cents to 71 cents, leaving Polymarket priced higher despite identical point gains.

Kalshi records a 50,000-contract purchase

The largest individual trade was a purchase of 50,000 contracts on Kalshi’s Democratic side at 71 cents, executed at 12:19 p.m. Eastern. Kalshi recorded about 235,000 contracts traded during the window, according to FinancialMarkets.

The account, published Nov 1, 2026, at 8:30 AM ET, places that purchase alongside a broader repricing across the two platforms. The supplied summary does not identify the buyer or establish what drove the gains.

What it means for prediction markets

  • Both platforms moved in the same direction by the same amount, rather than showing a price shift confined to one venue.
  • The 50,000-contract purchase represented roughly one-fifth of Kalshi’s approximately 235,000-contract volume in the window—a substantial share, but not evidence by itself of what caused the repricing.
  • Prices above 70 cents indicate that Democratic Senate control was favored in both markets; they do not establish the election outcome.
KalshiPolymarketSenateInfiniti MarketsInfiniti Signals

Sources & attribution

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  1. Source
    FinancialMarkets
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