Rep. James Comer (R-KY), Chairman of the House Oversight and Government Reform Committee, launched a congressional probe into possible insider trading on prediction-market platforms Friday [1, 2].
The investigation targets Kalshi and Polymarket, two prominent platforms where users bet on the outcome of real-world events. This probe highlights growing concerns that these markets may be susceptible to manipulation by individuals with non-public information, potentially undermining the integrity of financial and political forecasting.
Comer said the investigation was launched during an appearance on CNBC’s ‘Squawk Box’ [3]. The committee is examining whether current regulatory frameworks are sufficient to prevent insider trading within these digital betting environments [1, 4]. Prediction markets have seen a surge in popularity, with billions bet each week on various outcomes [5].
The probe comes as lawmakers weigh the need for stricter oversight of platforms that allow users to hedge bets on government actions and policy shifts. Because these markets can move based on leaked information, the committee is evaluating if new regulations are required to ensure a fair marketplace [2, 4].
Separate from the prediction market probe, other financial discussions involving the administration have surfaced. Reports indicate that President Trump's anti-weaponization fund totals $1.8 billion [6].
Kalshi and Polymarket have both expanded their offerings in recent years, attracting a wide range of retail and institutional traders. The House Oversight Committee has the authority to subpoena documents and testimony to determine if illegal trading patterns exist on these platforms [1, 3].
“Rep. James Comer launched a congressional probe into possible insider trading on prediction-market platforms.”
The investigation signals a shift in how the U.S. government views prediction markets, moving from seeing them as niche forecasting tools to treating them as potential systemic risks. If the committee finds evidence of insider trading, it could lead to the classification of these platforms as traditional financial exchanges, triggering rigorous SEC or CFTC oversight, and limiting the types of events that can be traded.
