The House Committee on Oversight and Government Reform has opened an investigation into prediction market platforms Polymarket and Kalshi, looking into whether they're doing enough to stop insider trading. Chairman Rep. James Comer sent letters to both companies this week, demanding details on their policies and enforcement measures.
Why the probe was launched
Comer called the prediction markets ecosystem a 'Wild West' in a statement accompanying the letters. The committee wants to know how these platforms handle trades based on non-public information — the kind of activity that would get a stock trader banned for life.
Prediction markets let users bet on the outcome of future events, from elections to economic data releases. Unlike traditional securities, they've largely operated without the same level of regulatory scrutiny. That's now changing.
What Comer wants to know
The letters request detailed answers on several fronts. Comer is asking Polymarket and Kalshi to explain their existing policies against insider trading and how they detect suspicious activity. He also wants to see records of any enforcement actions they've taken — warnings, suspensions, or bans — against users who may have traded on inside information.
The committee is pressing for specifics on whether the platforms monitor for trades placed just before major public announcements. For example, if a user bets heavily on a policy change hours before it's officially announced, what happens? Comer wants that documented.
Another line of inquiry focuses on employee trading. The letters ask whether employees at Polymarket and Kalshi are allowed to trade on their own platforms, and if so, what restrictions apply.
The 'Wild West' label
Comer's choice of words — 'Wild West' — signals that the committee views the current regulatory gap as a problem. Prediction markets have grown fast. Polymarket alone handled billions in bets during the last U.S. election cycle. But the rules governing them are still being written, state by state.
The Commodity Futures Trading Commission (CFTC) has taken some steps. It's sued both Polymarket and Kalshi in the past over whether their contracts qualify as gambling or derivatives. Those cases are ongoing. But the Oversight Committee's probe adds a new layer of pressure — and it's coming from Congress, not a regulator.
For Kalshi, which has positioned itself as a compliant, CFTC-regulated exchange, the investigation is awkward. The company has long argued its markets are legal and transparent. Polymarket, which operates mostly via blockchain and isn't registered with the CFTC, faces a different set of questions.
What happens next
Both companies have been given a deadline to respond to the committee's requests. The letters don't specify a date publicly, but typical deadlines in such probes range from two to four weeks. After that, the committee could hold hearings, subpoena additional documents, or refer findings to law enforcement.
For now, the platforms are reviewing the letters and preparing their responses. One unresolved question is how far the committee will push — and whether this probe leads to new legislation aimed at prediction markets.
