House Oversight and Government Reform Committee Chairman James Comer (R-Ky.) sent letters on September 29 to Hyperliquid Labs, Crypto.com and Aristotle Exchange, the company behind PredictIt, seeking documents on user verification, geographic restrictions and systems for detecting trades based on nonpublic information. The companies have until October 13 to respond, extending an inquiry that began with May 22 letters to Polymarket and Kalshi. The committee is seeking know-your-customer policies, suspicious-trade reporting procedures and records involving event contracts tied to Federal Reserve decisions, elections and geopolitical outcomes. Comer said some bad actors have used the platforms to profit from nonpublic information and that the committee is examining whether they do enough to prevent insider trading. The Hyperliquid request focuses on a roughly $1.1 billion leveraged short across Bitcoin and Ether perpetual contracts opened about 30 hours before President Donald Trump announced China tariffs in October 2025. The position was later closed for more than $150 million in profit, according to an Investing.com analysis cited by the committee. Comer said the trade occurred on a platform that apparently lacked identity verification or a mechanism to refer the responsible party to U.S. law enforcement, while stopping short of alleging that the trader possessed nonpublic information. Hyperliquid, which added HYPE staking earlier this year, had not publicly responded. The inquiry has produced nearly 1,000 documents and five briefings from Polymarket and Kalshi so far. It intensified after the April indictment of Army Master Sergeant Gannon Ken Van Dyke, whom prosecutors say used classified information about Operation Absolute Resolve to place Polymarket bets that returned more than $409,000. The operation led to the capture of Venezuelan President Nicolás Maduro. Comer separately asked Crypto.com about employees with access to confidential information and its North American derivatives business. The requests do not allege wrongdoing by any platform and represent the broadest congressional demand to date for prediction markets and crypto derivatives exchanges to document their controls against trading on inside knowledge.