Key Points:
- US lawmakers intensified scrutiny on Kalshi and Polymarket after reports of suspiciously timed prediction market trades tied to military and political events.
- The House Oversight Committee is investigating whether insiders with access to classified information exploited prediction markets for financial gain.
- The inquiry references a criminal case involving a US Army Master Sergeant accused of earning more than $400,000 through Polymarket using confidential military intelligence.
House Investigation Expands Over Prediction Market Trades
The US House Oversight Committee has escalated its investigation into prediction market platforms Kalshi and Polymarket following allegations of insider trading tied to geopolitical and political developments.
Representative James Comer’s inquiry specifically referenced reports involving “suspiciously timed trades” connected to Israel’s military actions against Iran, ceasefire announcements involving US President Donald Trump and congressional election contracts.
The investigation gained momentum after a May 13 New York Times report identified more than 80 Polymarket accounts that allegedly displayed unusual trading behavior around sensitive military operations and political events.
Lawmakers are now demanding detailed internal records from both companies involving Know Your Customer procedures, suspicious activity monitoring systems, geographic restrictions and insider trading detection tools.
Polymarket and Kalshi Tighten Compliance Measures
Both prediction market companies had already begun strengthening compliance controls before the congressional inquiry intensified.
Polymarket announced in March that it updated its internal policies and monitoring procedures related to potential insider trading activity on the platform.
Meanwhile, Kalshi disclosed in April that it had suspended and fined three US politicians for placing bets on their own political races, reinforcing concerns about conflicts of interest and misuse of privileged information.
Despite requests for comment from media outlets, neither Polymarket nor Kalshi issued immediate public responses regarding the latest House inquiry.
Soldier Accused of Profiting From Classified Information
One of the highest-profile cases connected to the investigation involves US Army Master Sergeant Gannon Ken Van Dyke.
Federal prosecutors allege that Van Dyke used classified military information related to “Operation Absolute Resolve,” the US operation that resulted in the capture of Venezuelan President Nicolás Maduro, to place profitable trades on Polymarket.
According to court filings, prosecutors claim Van Dyke generated more than $400,000 in profits through event contracts tied to Maduro’s capture before the operation became public knowledge.
Authorities further alleged that Van Dyke accessed the platform through a virtual private network to bypass geographic restrictions.
Van Dyke pleaded not guilty to charges that include commodities fraud and unlawful use of confidential government information for personal gain. He was later released on $250,000 bail with limited travel restrictions between North Carolina, California and New York.
Congress Raises National Security Concerns
Lawmakers are increasingly worried that prediction markets may create financial incentives for government employees, military personnel or political insiders to exploit nonpublic information.
Comer warned that the rapid growth of global prediction markets, especially those operating across borders with crypto infrastructure, may have created a regulatory gray area vulnerable to abuse.
The House committee is also investigating whether international users face weaker verification standards than US-based traders, particularly after Kalshi expanded into more than 140 countries in 2025.
Prediction Markets Face Mounting Pressure
The investigation arrives as prediction markets experience explosive growth across politics, sports and geopolitical forecasting.
Kalshi and Polymarket have both attracted significant retail and institutional trading volumes, while regulators continue debating whether such platforms should be treated as financial exchanges, gambling operations or entirely new market structures.
The Commodity Futures Trading Commission has repeatedly asserted that federally regulated prediction markets fall under its jurisdiction, while several US states continue challenging the legality of event-based contracts.
The House investigation could significantly shape future regulation of crypto-enabled prediction markets, particularly around insider trading safeguards, KYC standards and national security oversight.
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