Prediction Market Leaders Face Scrutiny Over Insider Trading

The rapid growth of prediction markets has drawn intense scrutiny from lawmakers and regulators following allegations that participants may be using non-public information to profit from geopolitical events [1, 2]. While these platforms have seen trading volumes surge to over $20 billion as of January 2026, concerns regarding transparency and potential insider trading have prompted calls for stricter oversight [1, 2].

Key takeaways

• Monthly trading volume across prediction markets increased from $1.2 billion in early 2025 to over $20 billion by January 2026 [1].
• Polymarket and Kalshi, the industry's two largest platforms, have a combined valuation exceeding $30 billion [1].
• Allegations of insider trading emerged after accounts made significant profits on events such as the removal of Venezuelan President Nicolás Maduro and military strikes in Iran [1, 2].
• Kalshi operates as a U.S.-regulated exchange requiring user identification, while Polymarket primarily operates outside the U.S. using cryptocurrency and pseudonyms [2].

Navigating Regulatory and Ethical Challenges

The industry’s expansion has been marked by controversial wagers on war and political outcomes, leading to accusations that some traders possess advance knowledge of sensitive operations [1]. In early January, a Polymarket account reportedly turned a $33,000 bet on the removal of Venezuelan President Nicolás Maduro into $400,000 in profit, with other accounts linked to apparent insiders clearing an additional $230,000 [1]. Similar patterns were observed regarding U.S. and Israeli air strikes on Iran, where numerous accounts secured large payouts in the hours preceding the attacks [1].

These events have sparked a debate over the operational standards of prediction markets. Kalshi, which is regulated in the U.S., requires customers to provide identification to comply with "Know Your Customer" rules [2]. In contrast, Polymarket utilizes cryptocurrency for settlements and allows for anonymous, pseudonymous trading [2]. Following the Iran-related wagers, Kalshi canceled bets and issued refunds, stating it does not permit betting on death, a move that drew criticism from some users [1]. A spokesperson for Kalshi stated that the company supports congressional and regulatory efforts to police insider trading [2].

Why it matters

The rise of these platforms has prompted a broader conversation about the role of financial speculation in public life. While proponents like Kalshi CEO Tarek Mansour argue that these markets provide a new way to consume information and replace subjectivity with "accuracy and truth," critics express concern that they have become "online casinos" that incentivize betting on violence [1]. Senator Chris Murphy has suggested that the financial incentives created by these markets could influence decision-making regarding war, labeling the practice as potentially worse than traditional insider trading [1]. As state and federal regulators consider stricter rules or potential bans, the industry faces an uncertain future where the demand for "financializing everything" clashes with increasing demands for accountability [1, 2].