Louisiana hauls five trading platforms into court over prediction markets

Louisiana filed the suit in state court on November 12, 2026, and it isn't asking for a slow burn. Murrill's office wants a temporary restraining order and an injunction, meaning the platforms would have to stop offering the contested contracts while the case plays out rather than years down the line. Murrill said prediction markets let people wager on a wide range of subjects. It's the first time the state has folded a broad group of prediction-market platforms into a single filing instead of chasing them one at a time.

Kalshi moved first. The company filed a preemptive federal suit on October 23, 2026 in the Western District of Louisiana, and Polymarket has gone to federal court as well. Both argue the Commodity Exchange Act, which governs commodities and derivatives trading, preempts state law, and they point to regulatory changes in effect since August 2026 to back that up. Now Kalshi wants an emergency court order against Louisiana while the two tracks collide.

The defendant list is the tell. Kalshi and Polymarket run prediction markets for a living, Robinhood is a retail brokerage, and Coinbase and Gemini are crypto exchanges. Louisiana is treating all five as players in the same activity, no matter how each one labels its business. The state's position has roots: in 2025, the Louisiana Gaming Control Board issued an advisory declaring sports event contracts gambling under state law, and legislation passed in 2026 widened the definitions and penalties for unauthorized gambling.

Louisiana isn't out front on this. Active enforcement actions against similar platforms have been reported in at least 12 other states as of November 2026, though naming five companies in one suit sets Louisiana apart. The practical stakes are immediate: if the state wins its order, the named platforms could be forced to pull sports, awards and election contracts from Louisiana users while the bigger fight continues. As of November 12, 2026, no final rulings have resolved any of the Louisiana cases.

The hinge is federal preemption. If federal courts side with the Commodity Exchange Act argument, state gambling statutes may have limited reach over these contracts. Watch how the court answers Kalshi's emergency request, any ruling on Louisiana's restraining order, and the parallel federal suits from Kalshi and Polymarket.