Kentucky Attorney General Russell Coleman filed lawsuits on June 17, 2026, against Kalshi, Polymarket and related affiliates, alleging that the platforms operate unlicensed sports wagering and illegal gambling in the Commonwealth. The cases escalate a widening jurisdictional fight over whether sports-linked prediction markets are derivatives or gambling products.

The lawsuits arrive shortly after Kentucky enacted legislation in April 2026 imposing a 14.25% excise tax on prediction-market transaction fees. They also come one week after a coalition of operators sued to block that tax, placing state gaming enforcement and prediction-market taxation on a direct collision course.

Kentucky Frames Event Contracts as Sports Wagering

The Commonwealth’s complaints argue that contracts tied to sports outcomes fall within Kentucky’s statutory definition of sports wagering. On that basis, the state alleges Kalshi and Polymarket needed licensing through the Kentucky Horse Racing and Gaming Commission before offering sports-linked markets to users in Kentucky.

Kentucky also alleges that the platforms failed to provide resources for gambling addiction as required under state law. In Kalshi’s case, the complaint further claims the company partnered with Coinbase to facilitate fee-bearing wagering activity, making platform distribution and payment infrastructure part of the state’s enforcement theory.

The filings cite trading volumes to support the claim that sports-related markets are central to the business activity at issue. Kentucky says Kalshi reported roughly $23 billion in contract volume for 2025 and alleges that sports-related contracts accounted for about 70% to 89% of that total, underscoring the state’s argument that sports markets are not incidental activity.

The allegations remain claims in active litigation, not final legal findings. That distinction matters because the core legal classification of these event contracts remains unresolved between state gambling authorities and federally regulated prediction-market operators.

Operators Challenge Kentucky’s Tax and Authority

A coalition including Kalshi, Polymarket and Crypto.com had already sued to block Kentucky’s tax package, enacted through House Bills 757, 904 and 869. The operators argue that the 14.25% excise tax is targeted and unconstitutional, claiming the law uniquely burdens federally regulated exchanges.

Their complaint also contrasts the prediction-market tax with the 9.75% rate applied to incumbent in-state gaming operators. That comparison supports the operators’ position that Kentucky is imposing disparate treatment on a specific class of trading platforms.

The platforms’ broader argument rests on federal preemption. They contend that event contracts are federally regulated derivatives under the Commodity Exchange Act and the Commodity Futures Trading Commission, meaning state gambling rules and targeted state taxes should not control the products.

The operator coalition also raises commerce, equal protection, First Amendment and special-legislation objections. In their view, Kentucky’s tax projects state authority beyond its borders and functions as regulatory punishment rather than a neutral revenue measure applied across comparable markets.

The legal divide is now clear. Kentucky treats sports event contracts as gambling activity requiring state licensing and consumer safeguards, while the platforms argue that federal derivatives law limits state authority over CFTC-regulated markets.

The outcome could reshape prediction-market operations well beyond Kentucky. A ruling favoring the state could force platforms to adjust product mixes, pursue gaming licenses, raise fees, strengthen geofencing or withdraw certain markets, creating higher compliance costs and fragmented market access.

A ruling favoring the operators would strengthen CFTC primacy and limit state efforts to impose gambling-style licensing or excise taxes on event-contract exchanges. Either way, traders should expect legal uncertainty to affect platform economics, product availability and market structure while the cases move through court.