Kalshi Dominates 89% of U.S. Prediction Markets Amid Federal-State Legal Clash

Key Takeaways

• Bank of America data reveals Kalshi controls 89% of U.S. prediction market trading volume
• Overall prediction market activity increased 4% weekly, though Polymarket experienced a 16% decline
• Federal agencies filed lawsuits against Arizona, Connecticut, and Illinois on April 2, 2026 regarding state-level gambling regulation
• A federal appeals court sided with Kalshi in New Jersey on April 6, 2026
• The resolution of these federal-state disputes will shape the industry’s regulatory landscape

The U.S. prediction market sector continues expanding, yet a jurisdictional conflict between federal authorities and state governments is reshaping regulatory control over the industry.

Recent Bank of America analysis indicates aggregate weekly trading activity climbed 4% compared to the previous week. Kalshi experienced 6% growth during this timeframe. Polymarket recorded a 16% decrease in trading volume during the identical period.

Kalshi currently commands approximately 89% of tracked U.S. prediction market activity. Polymarket accounts for 7% while Crypto.com represents 4%, based on Bank of America’s calculations.

The disparity between platforms stems from their regulatory approaches. Kalshi maintains registration with the Commodity Futures Trading Commission (CFTC) and positions its offerings as federally supervised derivatives. Polymarket operates through blockchain technology and has traditionally functioned beyond U.S. regulatory frameworks.

State governments have mounted resistance. Nevada and Massachusetts secured preliminary injunctions targeting Kalshi. Arizona escalated matters in March 2026 by pursuing criminal charges against the platform — marking the first criminal prosecution ever directed at a CFTC-registered entity.

Federal Agencies Launch Legal Action Against Three States

On April 2, 2026, the CFTC and Department of Justice initiated three distinct federal lawsuits targeting Arizona, Connecticut, and Illinois. The legal actions directly name state governors and regulatory officials.

The CFTC characterized this action as “unprecedented” and justified it as essential for defending its exclusive authority over event contracts under the Commodity Exchange Act.

Connecticut distributed cease-and-desist notices regarding sports-focused contracts. Illinois followed with similar enforcement actions. Arizona advanced to criminal prosecution.

CFTC Chairman Michael Selig stated: “The CFTC will continue to safeguard its exclusive regulatory authority over these markets and defend market participants against overzealous state regulators.”

State authorities remain defiant. Connecticut Attorney General William Tong characterized the contracts as “plainly unlicensed illegal gambling.” An Illinois representative argued these firms expose citizens to products lacking “basic consumer protections.”

Federal Appeals Court Rules for Kalshi

On April 6, 2026, the U.S. Court of Appeals for the Third Circuit issued a 2-1 decision favoring Kalshi. The ruling prevented New Jersey gaming authorities from enforcing state gambling regulations on Kalshi’s operations.

The court determined that Kalshi’s event contracts qualify as “swaps” under the Commodity Exchange Act, establishing the CFTC’s exclusive regulatory authority. This represents the first federal appellate decision addressing this jurisdictional question.

Kalshi CEO Tarek Mansour described it as “a big win for the industry.”

Should federal regulators succeed in pending litigation, platforms such as Kalshi could function under unified national regulations. Conversely, defeats could fragment the industry into a state-specific regulatory structure resembling online sports wagering.

Binance revealed on April 10, 2026 that it integrated a prediction markets capability into Binance Wallet, demonstrating sustained engagement from prominent cryptocurrency platforms in this sector.

The CFTC maintains an active public feedback window through the end of April concerning an Advanced Notice of Proposed Rulemaking for prediction markets.