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Oversight Chairman Comer launches congressional probe into insider trading on Kalshi, Polymarket

Comer seeks records on identity checks and suspicious trades as lawmakers weigh new limits on prediction markets.

  • On Friday, House Oversight Committee Chairman James Comer launched an investigation into prediction markets Kalshi and Polymarket, requesting documents from both CEOs regarding user verification and suspicious trading activity by June 5.
  • The investigation follows the indictment of Gannon Ken Van Dyke, a special forces soldier who allegedly netted roughly $400,000 betting on Venezuelan President Nicolas Maduro, amid concerns that government employees could exploit insider knowledge for profit.
  • Seven Democratic lawmakers previously urged the Committee to subpoena the platforms, citing 'apparent corruption and insider trading' concerns; reports indicate more than 80 users made suspicious trades before U.S. and Israeli strikes in Iran.
  • Documents requested from Kalshi CEO Tarek Mansour and Polymarket CEO Shayne Coplan aim to identify potential 'bad actors' on the platforms, though Kalshi is U.S.-regulated while Polymarket operates internationally outside Commodity Futures Trading Commission oversight.
  • Prediction markets have expanded into more than 140 countries, prompting bipartisan legislative efforts to rein them in as Comer and lawmakers argue current laws lack clear prohibitions against using insider information for profit.
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Spectrum News broke the news in United States on Friday, May 22, 2026.
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