Chairman Comer Launches Congressional Probe Into Insider Trading on Kalshi and Polymarket

The House Oversight Committee’s investigation into prediction markets could prompt stricter regulation, with potential effects on platform operations and how investors approach event-based trading.

34d ago

Fact Check

The claim is confirmed at the highest level of confidence. The CNBC article published on May 22, 2026 directly reports the probe launch, and Rep. Comer's own official X account (@RepJamesComer) announced it in his own words, retweeted by the official House Oversight Committee account (@GOPoversight). The NPR article from May 19, 2026 provides pre-existing context showing the Oversight Committee had already begun reviewing prediction market operations with Comer threatening subpoenas. The Pappas House press release confirms the broader bipartisan congressional pressure campaign targeting Kalshi and Polymarket. All specific claim elements are verified: Comer's role as House Oversight Chair, the probe targeting both Kalshi and Polymarket, the focus on trading controls, identity checks, and geofencing, and the election and national-security-linked market activity angle.

Summary

House Oversight Committee Chair James Comer said the committee plans to investigate prediction market platforms Kalshi and Polymarket over concerns that government employees or others with access to nonpublic information could profit from insider trading. He said the committee will seek internal records from both CEOs and is considering legislation that would bar lawmakers and government officials from participating in prediction markets. The investigation centers on whether event contracts were influenced by nonpublic or potentially classified information and could lead to stricter regulation, affecting platform operations and investor strategies.

Terms & Concepts

Prediction market: A marketplace where users trade contracts tied to future events, with prices often reflecting the market’s implied probability of an outcome.