6th Circuit deepens split on Kalshi sports event contract preemption
A 6th Circuit ruling dated September 29, 2026 has deepened a split over the regulatory status of Kalshi's sports event contracts, according to Sportico. The ruling comes amid ongoing legal disputes and alongside coverage of the Protect College Sports Act. About 20 states are still challenging sports event contracts from Kalshi, Polymarket, and Robinhood, though the specific states and actions remain unspecified. A federal judge earlier this year found that Polymarket and Robinhood were unlikely to prevail on arguments that such contracts qualify for federal preemption.
Kalshi must now fight fresh precedents in two separate 6th Circuit rulings rather than one. Each new appellate loss narrows the federal preemption shield and gives state attorneys general a cleaner template to copy. The Ohio-Tennessee ruling already forced geofencing in two states; this parallel reasoning threatens any state with strict gambling statutes.
Kalshi's legal spend compounds across parallel cases faster than any single resolution. Traders hold positions whose legality shifts with state borders, not federal registration. The circuit split makes Supreme Court review more likely, but cert grants are rare and months away. Meanwhile, state filings under these templates risk outpacing any unified federal answer. The first operator to lose outright becomes precedent every state copies.
Becomes the second major 6th Circuit ruling this week on state preemption of sports event contracts, joining the Ohio-Tennessee decision that already forced Kalshi to geofence two states.