Ohio Threatens to Sue Kalshi and Polymarket Over Sports Betting Contracts

Ohio Governor Mike DeWine said on October 21, 2026 that the state plans to file lawsuits against prediction-market companies - including Kalshi, Polymarket, Robinhood, and Coinbase - that keep offering sports-event contracts after being ordered to stop. "These are not self-executing," DeWine told reporters. "You have to actually go out and file these suits, and that's what we are going to do." The announcement follows cease-and-desist notices the Ohio Casino Control Commission sent in early October to ten companies, after a September 25 federal appeals ruling went against Kalshi in a related case.

Rather than wait to be sued, Polymarket's U.S.-registered exchange, QCX, struck first: it sued Ohio officials in federal court, arguing the state's demands violate the Commerce Clause, are preempted by the federal Commodity Exchange Act, and would force it to fracture a nationally licensed exchange along state lines. As of this week, one of the ten companies that received Ohio's notices has confirmed compliance (not publicly named), talks continue with the rest, and Ohio itself has not yet filed an enforcement suit - so the fight is still mostly playing out in court filings rather than actual prosecutions.

The Ohio clash is one front in a fast-moving, multi-state legal fight over whether prediction markets - federally registered as commodities exchanges and regulated by the CFTC - are effectively running unlicensed sports betting when their contracts let users wager on game outcomes. New Jersey has already asked the U.S. Supreme Court to resolve the underlying jurisdiction question, backed by 39 states and Washington, D.C., and on October 23, Senator Ted Cruz's office confirmed he plans to introduce a bill after the November 3 midterms that would require state or tribal approval before a prediction market could list a sports-linked contract - reversing the current setup where federal registration lets these platforms operate nationwide regardless of state gambling law.

For readers who follow the sweepstakes-casino space, the shape of this fight will feel familiar: companies built a product that didn't fit neatly into existing state gambling statutes, state regulators pushed back, and the companies are now testing how far a federal registration or structural workaround can go before a court or legislature closes the gap. Whichever side wins in Congress or the Supreme Court first will likely shape how aggressively states feel empowered to go after other gray-area betting products down the line.