House lawmakers launch insider trading probe into Kalshi and Polymarket

Updated on: May 22, 2026 / 3:58 PM EDT / CBS News

House lawmakers launch insider trading probe into Kalshi and Polymarket

TL;DR

  • The House Oversight Committee is investigating Kalshi and Polymarket for alleged insider trading.
  • Chairman James Comer is seeking details on the companies' insider trading investigation and user verification processes.
  • Suspiciously timed bets on events like the Iran war and Nicolás Maduro's capture have raised concerns.
  • A soldier was charged with using confidential information to bet on Maduro's removal.
  • Both platforms have implemented new rules and tightened existing ones to prevent insider trading.
  • Kalshi has banned members of Congress from creating accounts and fined candidates for betting on their own elections.
  • Polymarket's new rule prohibits traders from betting on events if they have a position of authority that could affect the outcome.