Key Highlights

  • Kentucky became the first state with a Republican attorney general to face a CFTC lawsuit after suing Kalshi and Polymarket for running alleged unlicensed sportsbooks and passing a law imposing a 14.25% excise tax on prediction market transaction fees.

  • The CFTC argues it holds exclusive federal jurisdiction over event contracts under commodities law and that state actions directly interfere with that authority.

  • Kentucky is the ninth state the CFTC has sued in its campaign to block state-level regulation of prediction markets, following actions against Wisconsin, Illinois, Arizona, Connecticut, New York, New Mexico, Minnesota, and Rhode Island.

The Commodity Futures Trading Commission has sued Kentucky, adding a ninth state to its running list of prediction market jurisdiction battles. The federal complaint, filed June 23, came days after Kentucky's attorney general sued Kalshi and Polymarket, accusing both platforms of operating unlicensed sportsbooks under state gaming law.

Kentucky's legislature had also passed a measure imposing a 14.25% excise tax on prediction market transaction fees. The CFTC's complaint targets that law directly, arguing the tax is structured to make the platforms economically unviable in the state rather than to raise revenue. The regulator is asking the court to block Kentucky from pursuing its claims against Kalshi and Polymarket.

The CFTC's core argument is that federal commodities law gives it exclusive authority over event contracts and that state-level enforcement actions directly undermine that mandate. Kentucky stands out as the first state with a Republican attorney general to face a federal challenge in this campaign, as the earlier eight actions had concentrated on Democratic-led states. The case signals that the CFTC's push to assert sole federal oversight of prediction markets is now crossing partisan lines.

The broader fight reflects a genuine disagreement over what prediction markets actually are. State gaming regulators tend to view them as gambling products requiring local licensing. The CFTC treats them as financial instruments under its remit. That tension has played out in courtrooms across the country over the past year, and the entry of regulated exchanges into the space is likely to sharpen the debate further.