Prediction Markets Under Fire: Insider Trading, Regulation, and the Ethics of Betting on War

Prediction markets are facing increased regulatory scrutiny as insider trading cases mount, with recent arrests and legislative proposals highlighting growing concerns about abuse in the rapidly expanding industry.

The arrest of a U.S. Soldier over a Polymarket bet on a Venezuelan raid has intensified scrutiny of prediction markets, raising alarms about insider trading and the potential misuse of non-public information. The incident, reported by PBS NewsHour, occurred when the service member placed wagers on the outcome of a military operation against Nicolás Maduro’s government shortly before the raid became public knowledge.

This case follows a pattern of suspicious trading activity observed in other geopolitical events. In February, ahead of U.S. Missile strikes on Tehran, six Polymarket accounts placed bets that accurately predicted the timing of the military action, collectively earning $1.2 million. One account turned an initial $61,000 stake into nearly $493,000—an 821% return—within 24 hours of the strikes. Similar windfalls were recorded in January related to bets on Maduro’s capture, with newly created accounts netting over $400,000 hours before the operation was announced.

These developments have prompted legislative action. Senator Richard Blumenthal (D-CT) introduced the Prediction Markets Security and Integrity Act, which seeks to ban wagers on war, death, and military action, crack down on insider trading and market manipulation, and require states offering sports betting to meet federal standards on advertising, affordability, and artificial intelligence use. The bill is cosponsored by Senator Andy Kim (D-NJ).