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Kalshi midterm activity climbs as November 3 elections approach

The hourly midterms tracker showed 15,686,341 contracts traded in 24 hours across Senate, House and chamber-control markets. The totals rose from 249.8 million contracts and 170.2 million in open interest in the earlier October 31 update ahead of the November 3 elections.

Kalshi’s midterm election markets reached 253.3 million contracts traded and 172.6 million in open interest across 100 live races, according to PredictionMarketPicks.

The figures appeared in an update published Oct 31, 2026, at 8:15 PM ET, ahead of the November 3 elections.

Trading totals rise during October 31

PredictionMarketPicks’ hourly midterms tracker recorded 15,686,341 contracts traded over 24 hours across Senate, House and chamber-control markets.

An earlier October 31 update had put cumulative trading at 249.8 million contracts and open interest at 170.2 million. Both measures increased in the later snapshot.

What it means for prediction markets

  • The tracker shows rising trading activity and open interest as the November 3 elections approach, but the aggregate figures do not establish which party or candidates traders favor.
  • The 24-hour total spans Senate, House and chamber-control markets; the supplied figures do not break down activity by individual race or market.
  • Contract counts measure activity, not election probabilities. The update provides no prices from which to assess changes in implied odds.
KalshiSenateInfiniti MarketsInfiniti Signals

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