The US House Oversight Committee has opened a formal investigation into prediction market platforms Kalshi and Polymarket over evidence that government officials and politicians used non-public information to place profitable trades on military operations and elections. Committee Chair James Comer sent letters to both platform CEOs on May 22, requesting internal records and compliance documentation following reports of more than 80 suspiciously timed trades placed ahead of Iran military operations.
The Insider Trading Pattern
Prediction markets allow users to bet on future events, but recent reporting has exposed systematic abuse by officials with access to classified information. A New York Times investigation published May 13 detailed suspicious trading activity timed to military and political events. Master Sergeant Gannon Ken Van Dyke, a US soldier, was indicted by the Justice Department for allegedly profiting $400,000+ through trades placed on non-public intelligence. Van Dyke was released on $250,000 bail and faces criminal charges that establish a direct prosecution pathway for insider trading on these platforms.
Regulatory Response and Platform Actions
Both platforms have taken limited steps to address the issue. Kalshi banned three US politicians in April for betting on their own electoral races, though the specific individuals were not named. Polymarket updated its insider trading approach in March, before the scale of the problem became public. The platforms have not responded to Comer’s inquiry as of publication. Polymarket suffered $600,000+ in exploit losses, raising questions about whether enforcement mechanisms are sufficient to detect and prevent information-based trading advantages.
Congressional Pressure and Market Regulation
Comer’s investigation signals increased congressional scrutiny of prediction markets as regulatory gaps become apparent. The platforms operate in a legal gray area, lacking comprehensive federal oversight despite their growing adoption among retail and institutional traders. The Van Dyke indictment demonstrates that the Justice Department is willing to pursue criminal charges, but reactive prosecution does not prevent future abuse. Comer’s specific focus on internal records suggests Congress may be preparing legislation to mandate disclosure requirements and real-time monitoring systems for high-conviction trades.
Next Steps and Unresolved Questions
Kalshi and Polymarket now face a 30-day window to respond to the House committee’s records request. The investigation could result in subpoenas, public hearings, or legislative proposals for prediction market regulation. The full scope of insider trading across both platforms remains unclear, as detailed trade data has not been released publicly. How platforms will balance user privacy with government transparency requirements remains unresolved.
