The House Oversight and Government Reform Committee has officially launched an investigation into the operations of prediction market platforms Kalshi and Polymarket. Committee Chair James Comer is seeking detailed information from the leadership of both companies to determine how they monitor for and prevent insider trading, particularly regarding events tied to U.S. government actions, military operations, and political elections.

Concerns have mounted regarding the potential for government employees and elected officials to leverage non-public information for financial gain on these platforms. The investigation aims to uncover whether current identity verification processes and geographic restrictions are sufficient to stop individuals with national security clearances or sensitive government knowledge from exploiting these markets. Lawmakers are particularly focused on recent suspicious trading activity, including bets placed ahead of military strikes in Iran and the political situation in Venezuela.

In formal letters sent to Polymarket CEO Shayne Coplan and Kalshi CEO Tarek Mansour, the committee requested comprehensive documentation on internal compliance measures. The inquiry highlights a growing bipartisan push to regulate the prediction market industry, which has seen a surge in popularity. While Kalshi, a U.S.-regulated exchange, maintains that it has robust protections in place, the committee is scrutinizing how these platforms handle global users and whether their current oversight mechanisms are adequate to protect the integrity of government-related event contracts.

This probe follows a series of controversial incidents, including instances where political candidates were caught wagering on their own races and reports of individuals using insider knowledge to secure significant profits. The committee has set a deadline of June 5 for the companies to provide the requested data, which will be used to evaluate the necessity of new federal legislation aimed at preventing government personnel from participating in these speculative markets.