Lawmakers Grapple with Policing Prediction Market Risks

Concerns grow over potential insider trading as these markets gain popularity

Mar. 14, 2026 at 3:06pm

Got story updates? Submit your updates here. ›

The rise of prediction markets, where users bet on future events, has sparked concerns among lawmakers about the potential for insider trading and conflicts of interest. Recent high-profile trades, like a trader reportedly winning $553,000 betting on a U.S. strike on Iran, have brought increased scrutiny to these largely unregulated platforms. Current financial disclosure rules do not specifically address event contracts, creating a potential loophole that lawmakers worry could be exploited by those with access to non-public information.

Why it matters

Prediction markets offer a new way to speculate on future events, but the lack of clear regulations raises concerns about fairness and transparency. Lawmakers fear that individuals with insider knowledge, such as government officials or their staff, could use these markets to profit unfairly, undermining public trust in the political process.

The details

Prediction markets allow users to trade contracts based on the probability of specific events occurring. Unlike traditional stock markets, these platforms focus on predicting outcomes rather than company valuations. While some U.S.-regulated markets like Kalshi require user identification, others like Polymarket operate internationally using cryptocurrency, making them harder to monitor. The core concern is that those with privileged information, such as lawmakers or their staff, could exploit these markets for personal gain. Current financial disclosure rules do not mention 'event contracts' or 'prediction markets,' creating a potential loophole.

  • In July, a trader known as 'Magamyman' reportedly won $553,000 betting on a U.S. strike on Iran.
  • Senator Chris Murphy, D-Conn., publicly questioned whether members of President Trump's orbit were profiting from the war in Iran, though no evidence was cited.

The players

Senator Chris Murphy

A Democratic senator from Connecticut who publicly questioned whether members of President Trump's orbit were profiting from the war in Iran.

Senator Jeff Merkley

A Democratic senator from Oregon who stated that he is "confident" lawmakers are making bets on prediction markets, despite the lack of specific disclosure requirements.

Blake Chisam

A former chief counsel for the House Ethics Committee who described the lack of specific guidance on event contracts and prediction markets as a "blind spot" in current regulations.

Kalshi

A U.S.-regulated prediction market platform that requires user identification.

Polymarket

A largely international prediction market platform that operates using cryptocurrency, making it harder to track and monitor.

Got photos? Submit your photos here. ›

What they’re saying

“Nobody has said to me, 'we're making these bets,' but I'm confident that they are.”

— Senator Jeff Merkley, Democratic senator from Oregon (NPR)

“We must not let individuals continue to damage private property in San Francisco.”

— Robert Jenkins, San Francisco resident (San Francisco Chronicle)

What’s next

Senator Merkley has introduced legislation to ban members of Congress, the President, and Vice President from buying or selling prediction market bets, in an effort to close the existing loophole and prevent potential conflicts of interest.

The takeaway

The growth of prediction markets raises concerns about transparency and fairness, as the line between savvy investing and illegal insider trading becomes increasingly blurred. Lawmakers are grappling with how to effectively regulate these platforms and prevent potential conflicts of interest, as the future of these markets hinges on addressing these challenges.