Polymarket US joins prediction-market tide with Missouri preemption suit
Polymarket US filed a federal lawsuit in Missouri on Monday, challenging the state's crackdown on sports event contracts. All six companies targeted by Missouri have now sued in federal court. Polymarket US is also separately challenging Arkansas authorities, adding to its litigation docket alongside the Missouri complaint. The filings extend a broader pattern of sector-wide preemption litigation as platforms test whether CFTC registration blocks state gambling enforcement.
Every platform hit by Missouri has now sued, ending the split between fighters and holdouts that shaped earlier strategy. Polymarket US had watched Kalshi, Crypto.com, and Novig file first while it and Robinhood accepted state orders without challenge. That wait-and-see option is now closed: collective federal litigation is the only path left. For Kalshi, already defending five state fronts including Utah felony charges and a tribal injunction, Polymarket US's entry adds weight to the preemption argument but also crowds the docket with competing theories.
The Missouri federal judge must now reconcile multiple platform complaints against state enforcement. Robinhood remains the lone major holdout, and its silence increasingly reads as settlement preparation rather than legal patience. Each new federal filing makes a Supreme Court circuit-split appeal more likely, but also more complex to manage with divergent party interests.