Catenaa, Tuesday, May 26, 2026- The US House Oversight Committee has opened a congressional investigation into insider trading risks on prediction market platforms Kalshi and Polymarket, escalating regulatory pressure on the rapidly growing sector amid concerns government officials may be profiting from nonpublic information.
House Oversight and Government Reform Committee Chairman James Comer sent formal letters Friday to Kalshi Chief Executive Tarek Mansour and Polymarket Chief Executive Shayne Coplan requesting internal records and compliance documents by June 5.
The committee is seeking details on identity verification systems, geographic restrictions, suspicious trade monitoring and safeguards against insider trading across both platforms.
Government Concerns
Comer said lawmakers are increasingly worried that members of Congress, government employees or administration officials could use confidential information to profit through prediction markets tied to geopolitical events, elections and military operations.
The investigation follows several controversial incidents involving trades connected to military and political developments in Iran and Venezuela.
Authorities arrested a US soldier in April for allegedly using insider information related to Venezuelan political developments to generate hundreds of thousands of dollars in profits on Polymarket.
A New York Times investigation also reportedly identified suspicious trades placed shortly before military actions involving Iran.
Platforms Tighten Controls
Both companies recently strengthened compliance policies amid mounting scrutiny.
Kalshi suspended several congressional candidates earlier this year after they reportedly traded on contracts involving their own election races, violating platform rules.
Polymarket separately hired blockchain analytics firm Chainalysis to improve detection of insider trading and market manipulation as it seeks broader regulatory approval in the US.
Kalshi said it maintains extensive protections against insider trading and welcomed cooperation with lawmakers. Polymarket also said it maintains a broad market integrity framework focused on transparency.
Regulatory Divide
The investigation also highlights growing differences between the two companies’ regulatory structures.
Kalshi operates under Commodity Futures Trading Commission oversight inside the US and does not allow anonymous trading.
Polymarket primarily operates offshore through Panama while maintaining a smaller regulated US product.
Prediction markets have expanded rapidly over the past two years, attracting billions of dollars in trading volume linked to elections, economics and geopolitical events.
Political Pressure
Pressure for tighter oversight has intensified in Washington following bipartisan proposals seeking to restrict prediction market trading by officials with access to sensitive government information.
Some lawmakers increasingly argue the platforms blur the line between financial forecasting and gambling while creating new risks surrounding classified information and market manipulation.
Analysts said the congressional probe could shape future legislation governing prediction markets as regulators attempt to define how these rapidly growing platforms fit within existing financial and gambling laws.
