SHE:002156 2 February 2026

May 23, 2026, 12:23 AM EDT. Republican Rep. James Comer, chair of the House Oversight Committee, has initiated a congressional investigation into alleged insider trading and market manipulation on prediction market platforms Kalshi and Polymarket. Comer sent letters demanding documents on how these platforms monitor suspicious trades, verify users, and prevent insider trading, especially concerning sensitive events like military operations and political developments. The probe targets potential use of classified information and circumvention of U.S. regulations via offshore or anonymous accounts. Kalshi and Polymarket have pledged cooperation, emphasizing their market integrity frameworks. This investigation follows increasing popularity of prediction markets and reports of suspicious trades linked to government actions, including a recent case involving a U.S. soldier charged with using classified information for trading.