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House control draws most trading volume in Polymarket’s congressional markets

TMA Street reports Polymarket's House control market had reached 45,694,592 dollars in cumulative trading volume as of 19:01 UTC on November 3, 2026, against 20,663,299 dollars for its Senate control market. The House contract accounted for 68.9 percent of the combined 66,357,891 dollars traded across both chamber markets since their July 2025 launch.

Polymarket’s House control market recorded $45,694,592 in cumulative trading volume as of 19:01 UTC on November 3, 2026, according to TMA Street. Its Senate control market had accumulated $20,663,299 at the same point.

House trading outpaces Senate activity

The House market’s cumulative volume was 2.2 times that of the Senate market. Both contracts launched in July 2025, giving the comparison a shared starting period.

Together, the two chamber markets had generated $66,357,891 in trading volume since launch. The House contract represented 68.9 percent of that total, according to TMA Street.

What the figures show

The figures establish a substantial difference in cumulative trading activity between the two markets. They do not provide contract prices or implied probabilities for either chamber’s control.

The November 3 snapshot also does not show how trading was distributed over time. It therefore cannot establish whether the House market’s lead reflected a recent surge or activity accumulated earlier.

What it means for prediction markets

  • Activity is concentrated in the House contract: It accounted for 68.9 percent of combined volume across the two chamber markets.
  • Volume is not an outcome forecast: These totals alone do not indicate which party traders expected to control either chamber.
  • Cumulative totals have limits: The reported figures do not establish current trading intensity or available liquidity.
PolymarketSenateInfiniti MarketsInfiniti Signals

Sources & attribution

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    TMA Street
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