SKN | Kalshi and Polymarket Tighten Rules as Insider Trading Concerns Shake Prediction Markets

Key Points

• Kalshi and Polymarket introduced new restrictions to curb insider trading risks.
• The move coincides with a new bipartisan U.S. bill targeting event-based contracts.
• Growing scrutiny follows suspicious trades tied to geopolitical and political events.

Kalshi and Polymarket have both introduced new safeguards aimed at limiting insider trading, as pressure mounts from regulators and lawmakers. The changes mark one of the most coordinated responses yet from the prediction market sector to concerns over market manipulation.

Kalshi announced it will prohibit political candidates from trading on their own campaigns and extend restrictions to athletes, referees and other individuals directly involved in sports outcomes. Meanwhile, Polymarket introduced broader rules targeting users who trade based on stolen or confidential information or who can directly influence event outcomes.

Crackdown Follows Suspicious Trading Activity

The policy changes come after a series of controversial trades raised red flags across the industry. Some users reportedly profited from well-timed bets on geopolitical developments, including military actions, prompting concerns that insider knowledge may have been used.

Such incidents have intensified debate over whether prediction markets create incentives for individuals with privileged information to exploit these platforms for financial gain.

Lawmakers Push to Ban “Casino-Style” Contracts

The tightening of platform rules coincides with new legislation introduced by U.S. lawmakers seeking to curb the growth of prediction markets. The proposed bill would ban contracts that resemble sports betting or casino-style wagers, particularly those offered by platforms regulated under the Commodity Futures Trading Commission.

Lawmakers argue that many of these contracts are effectively gambling products operating outside traditional state-level regulations, while platforms maintain they fall under federal derivatives oversight.

Industry Faces Mounting Regulatory Pressure

Prediction markets have rapidly grown in popularity, but their expansion has brought increased scrutiny from regulators, policymakers and the public. Critics argue that the platforms blur the line between financial markets and gambling, while also opening the door to manipulation through insider access.

Kalshi has emphasized that its new restrictions are part of ongoing efforts to strengthen compliance and align with emerging regulatory expectations. At the same time, the broader industry remains divided on how strictly insider trading should be defined and enforced.

A Turning Point for Prediction Markets

The latest developments signal a pivotal moment for the sector. As platforms introduce stricter controls and lawmakers consider sweeping restrictions, the future of prediction markets may depend on their ability to balance innovation with transparency and regulatory compliance.

How these rules evolve — and whether new legislation passes — will likely determine whether prediction markets become a mainstream financial tool or face tighter limitations in the years ahead.