Rep. James Comer Investigates Insider Trading on Prediction Markets
Rep. James Comer, the Kentucky Republican and chair of the House Oversight and Government Reform Committee, has intensified his investigation into potential insider trading on prediction market platforms, specifically targeting Polymarket and Kalshi. This inquiry was initiated on May 22, with initial document requests directed at Polymarket CEO Shayne Coplan and Kalshi's leadership.
The investigation aims to uncover compliance records related to identity verification, trade restrictions, and logs of unusual trading activity, with a deadline for document submission set for June 5. The probe was triggered by the identification of over 80 trades on Polymarket that appeared to predict significant geopolitical events before they were publicly disclosed. Notably, one trader reportedly earned nearly $1 million with a 93% success rate on bets associated with U.S. military actions in Iran, placing wagers just hours before official announcements.
One of the most significant cases involves Army Master Sgt. Gannon Ken Van Dyke, who was federally indicted in April 2026 for allegedly using classified information regarding a Venezuela operation to profit approximately $409,881 on Polymarket.
In response to these developments, Comer has indicated plans to propose legislation that would explicitly prohibit government employees from trading on prediction markets related to government actions using insider knowledge. While federal insider trading laws and ethics regulations already prevent government employees from profiting off non-public information, prediction markets currently exist in a regulatory gray area. The Commodity Futures Trading Commission has recently begun to formalize oversight of platforms like Kalshi.
Additionally, Rep. Chris Pappas and other Democrats have advocated for subpoena authority as early as May 11, prior to Comer's formal launch of the investigation.
Updated 17:02 UTC
New Developments in Insider Trading Investigation
On October 10, 2025, President Trump announced that China would face 100% tariffs, leading to a significant crash in the crypto market. A trader on Hyperliquid had already placed a bet on this decline, prompting House Oversight Chairman James Comer to expand his investigation into insider trading on prediction markets.
Comer sent letters to Hyperliquid, Crypto.com, and PredictIt owner Aristotle Exchange, focusing on a specific short position valued at approximately $1.1 billion in Bitcoin and Ether, which was placed shortly before the tariff news became public.
The wallet associated with this trade reportedly made over $150 million as $19 billion in leveraged bets were wiped out. Investigators have linked the wallet to Garrett Jin, a former BitForex CEO, who has denied any wrongdoing.
Comer emphasized that the investigation is looking into how nonpublic information has been exploited for profit on these platforms. Each platform involved is required to provide their Know Your Customer (KYC) identity checks and detail their methods for identifying suspicious trades.
FAQ
What is the focus of Rep. James Comer's investigation?
Rep. James Comer's investigation focuses on potential insider trading on prediction market platforms, specifically targeting Polymarket and Kalshi.
What triggered the investigation into prediction markets?
The investigation was triggered by the identification of over 80 trades on Polymarket that seemed to predict significant geopolitical events before they were publicly disclosed.
What specific records is Rep. Comer seeking from Polymarket and Kalshi?
Rep. Comer is seeking compliance records related to identity verification, trade restrictions, and logs of unusual trading activity.
What legislation does Rep. Comer plan to propose?
Rep. Comer plans to propose legislation that would explicitly prohibit government employees from trading on prediction markets related to government actions using insider knowledge.
What regulatory actions have been taken regarding prediction markets?
The Commodity Futures Trading Commission has begun to formalize oversight of platforms like Kalshi, as prediction markets currently exist in a regulatory gray area.
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