CNBC: US House Oversight Committee launches investigation into Kalshi and Polymarket over insider trading issues According to Foresight News, CNBC reported that James Comer, Chairman of the House Oversight and Government Reform Committee, announced on May 22 that the committee had sent letters to Shayne Coplan, CEO of Polymarket, and Tarek Mansour, CEO of Kalshi, regarding insider trading issues, requesting the two companies to submit relevant documents explaining their respective measures in identity verification, geographic restriction enforcement, and abnormal trading monitoring. The deadline is June 5. \Comer pointed out in a letter to Polymarket that predicting the encryption infrastructure and user anonymity of the market may provide structural vulnerabilities that can be exploited by internal personnel holding national security licenses. Several suspected insider trading incidents have been exposed before: a US soldier was arrested on suspicion of using internal information to bet on the downfall of Maduro in Venezuela on Polymarket, profiting about $400000; The New York Times investigation also showed that over 80 Polymarket users had established relevant positions hours before the US and Israel launched attacks on Iran. On the Kalshi side, several congressional candidates were banned in April for betting on their own election results on the platform.