The U.S. House Oversight Committee has opened an insider trading investigation into prediction market platforms Polymarket and Kalshi. The probe signals a growing federal focus on how event-based contracts may be used to trade on non-public information.
What the investigation targets
Polymarket and Kalshi are platforms where users buy and sell contracts tied to the outcome of real-world events — elections, policy decisions, economic data. The Oversight Committee’s interest centers on whether traders on these markets have acted on material, non-public information, a practice that would violate federal securities laws if the contracts are deemed securities.
The investigation is in its early stages. The committee has not yet publicly detailed specific trades or individuals under scrutiny. Both platforms have previously drawn regulatory attention: Kalshi is registered with the Commodity Futures Trading Commission as a designated contract market, while Polymarket operates on a blockchain-based model that has faced questions about compliance.
Insider trading concerns in prediction markets
The core question is whether the same rules that govern stock markets apply to these new venues. If a trader buys a contract on a political outcome after learning a candidate’s internal polling data, that could be insider trading. But the legal framework for prediction markets remains uncertain — regulators have yet to clearly define what constitutes a security in this space.
The Oversight Committee’s probe suggests lawmakers see gaps in current oversight. Without a formal ruling on the status of these contracts, the investigation could push the CFTC or the Securities and Exchange Commission to clarify the rules.
Neither Polymarket nor Kalshi immediately responded to requests for comment. The committee has not announced a timeline for hearings or findings.
