CFTC sues Arizona, Connecticut, and Illinois over state crackdowns on prediction markets in a federal-state jurisdictional clash that may reach the Supreme Court

The Commodity Futures Trading Commission (CFTC) and the US Department of Justice have filed federal lawsuits against three states — Arizona, Connecticut, and Illinois — challenging state-level attempts to regulate or prohibit prediction markets as unlawful encroachment on federal regulatory turf. Prediction markets are exchange-traded contracts that allow participants to bet on the outcome of real-world events — elections, sports results, economic indicators — with prices reflecting the market's collective probability assessment. Leading platforms include Kalshi and Polymarket, both of which currently operate under CFTC licences (often acquired from original licence holders) as designated contract markets (DCMs) — formally regulated derivatives exchanges. The CFTC's move follows its March 12 issuance of an advanced notice of proposed rulemaking to update its regulations for prediction markets, alongside a staff advisory from its Division of Market Oversight clarifying how DCMs should design and monitor event contracts. The federal suits argue that state anti-gambling and securities laws are constitutionally preempted by the Commodity Exchange Act (CEA), which gives the CFTC exclusive jurisdiction over derivatives trading. Lawyers described the CFTC's decision to sue states as unprecedented, noting that the underlying legal questions are already being litigated in cases between the states and prediction market operators. The dispute is widely expected to escalate — potentially to the US Supreme Court or prompt Congressional action — given the growing economic scale of prediction markets and the absence of clear statutory guidance on their treatment. While primarily a US regulatory story, the CFTC's intervention has direct relevance to UK and EU lawyers tracking the global evolution of event derivative regulation, given that London-based prediction market operators and their investors face analogous questions under UK financial regulation.