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Congressional betting volume exceeds $420 million amid diverging stock market signals

Multibagg reports Bloomberg put notional volume on Kalshi's House and Senate control contracts above 420 million dollars as of November 3, while Kalshi's Democratic sweep odds stayed relatively stable through late October even as the Nasdaq-100 closed October 30 about 9.1 percent below its October 6 record. It also cites Anti-Corruption Data Collective figures showing the top 1 percent of Polymarket wallets accounted for 68 percent of congressional-market volume through August 10.

Kalshi activity rises above $420 million

Kalshi’s House and Senate control contracts recorded more than $420 million in notional volume as of November 3, according to Bloomberg figures cited by Multibagg.

The volume figure measures trading activity in the congressional-control contracts. Separately, Multibagg reported that Kalshi’s odds of a Democratic sweep remained relatively stable through late October.

Equity decline offers a contrasting signal

That stability contrasted with weakness in stocks. The Nasdaq-100 ended October 30 about 9.1 percent below the record it reached on October 6, according to Multibagg.

The figures show different movements in election probabilities and equities over the cited periods. They do not establish a causal relationship between congressional expectations and the stock-market decline.

Polymarket volume concentrated among leading wallets

Multibagg also cited Anti-Corruption Data Collective figures showing that the top 1 percent of Polymarket wallets generated 68 percent of congressional-market volume through August 10.

That concentration measure covers a different platform and an earlier period than the Kalshi volume figure. It describes the distribution of trading activity among wallets, rather than the distribution of political expectations.

What it means for prediction markets

  • Activity and probability are distinct: Kalshi’s notional volume exceeded $420 million, while its Democratic sweep odds remained relatively stable through late October.
  • Cross-market signals require care: The Nasdaq-100’s decline did not coincide with a comparable reported shift in sweep odds; the supplied figures do not explain why.
  • Wallet concentration matters when interpreting volume: Polymarket’s top 1 percent of wallets accounted for 68 percent of congressional-market activity through August 10, limiting what aggregate volume alone reveals about broad participation.
KalshiPolymarketSenateInfiniti MarketsInfiniti Signals

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