Polymarket Security Breach Causes $2.7 Million Loss for Traders
Polymarket halted trading on its international platform on October 29, 2026, after a security breach involving a third-party monitoring service led to unauthorized withdrawals totaling about $2. 7 million. The company pledged to reimburse all affected traders and to strengthen its security measures. Prior to the breach, Polymarket's global intelligence team had been investigating dozens of election-related bets and referred some cases to the U.
S. Commodity Futures Trading Commission. The platform's surveillance system generated numerous alerts daily to monitor betting activity and detect potential insider trading. The incident prompted a temporary suspension of trading for about an hour while the company addressed the security issues and initiated refunds to impacted users.
