Overview
- House Oversight Committee Chair James Comer opened the formal investigation on May 22 and sent letters to Polymarket CEO Shayne Coplan and Kalshi CEO Tarek Mansour seeking internal records on user identity checks, geographic restrictions, and systems that flag anomalous trades.
- The committee set a June 5 deadline for the companies to produce documents, and Republican control of the panel gives Comer the votes needed to issue subpoenas if the platforms do not comply.
- The probe follows a federal indictment unsealed April 24 that accuses U.S. Army Master Sgt. Gannon Ken Van Dyke of using classified information to earn about $409,000 on Polymarket and reporting that analysts found dozens of unusually well‑timed, high‑win‑rate bets tied to Iran and other events.
- Kalshi operates as a CFTC‑designated exchange with non‑anonymous trading rules and has suspended users for rule violations, while Polymarket’s crypto‑native, partly offshore design creates harder lines of sight into who is placing trades.
- If the committee finds systemic gaps, outcomes could include subpoenas, tighter CFTC or DOJ enforcement, and new legislation to bar government employees and members of Congress from trading on prediction markets, with close attention to how platforms verify users and detect suspicious patterns.