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Who will win the Massachusetts 9th District general election for the US House of Representatives in 2026?

MA-09 General Election 2026 · Nov 3, 2026 · Trading open

$438 vol.

About this market

Traders price Bill Keating at 88% to win.

The market has $438 in volume across 5 trades; the most recent was on May 9, 2026.

Trading closes on Nov 19, 2026. The result is confirmed by Massachusetts Secretary of the Commonwealth Elections Division.

This race determines the outcome of the general election for the US House of Representatives in Massachusetts 9th District, shaping representation in the US House of Representatives.

Rules and timeline

Each outcome is its own contract. A Yes contract pays $1 if its outcome happens and $0 if not; a No contract pays the reverse. Because the contracts trade separately, their chances don't have to add up to 100%.

  • Bill KeatingResolves Yes if Bill Keating wins the Massachusetts 9th District general election for the US House of Representatives in 2026.
  • Tyler MacallisterResolves Yes if Tyler Macallister wins the Massachusetts 9th District general election for the US House of Representatives in 2026.

Result confirmed by Massachusetts Secretary of the Commonwealth Elections Division.

Trading opened
Feb 25, 2026
Trading closes
Nov 19, 2026
Expected result
Nov 19, 2026
Expected payout
Nov 19, 2026

More Massachusetts elections

Prices are the last trades on the ForecastEx exchange and can be delayed by about ten minutes. A chance is the price of a Yes contract, not a forecast by Aries. Event contracts involve risk, including the loss of the full amount paid. Information on this page is for informational purposes only and is not investment advice.