Second Appeals Court Puts States Back in Kalshi's Path
A federal appeals court says states can regulate Kalshi's sports event contracts — the second such ruling in under a month, and a setback for prediction market platforms.
A federal appeals court ruled on September 25, 2026 that states may regulate Kalshi's sports prediction markets, the second appellate decision in less than a month to find that states have a role in overseeing sports-related event contracts.
A federal appeals court has ruled that states may regulate the sports prediction markets offered by Kalshi, handing the platform another courtroom defeat in a fight that has spread across multiple federal circuits. It is the second appellate decision in less than a month to conclude that states retain a role in policing sports-related event contracts, according to CNBC.
The immediate practical effect is narrow — appellate rulings of this kind typically settle who gets to write the rules rather than shutting a market down overnight. The strategic effect is not narrow at all. Kalshi and its peers built their sports businesses on a single premise: that a federally regulated exchange listing event contracts answers to Washington and to Washington alone. Two appeals courts have now pushed back on that premise in the space of a few weeks.
The preemption argument that is losing ground
The core legal question is preemption — whether federal commodities law occupies the field so completely that state gaming regulators have nothing left to say. Event contracts are derivatives whose payout depends on whether a stated outcome occurs. When the stated outcome is the result of a football game, the product starts to look, to a state gaming board, indistinguishable from a wager. The platforms argue it is a futures contract listed on a federally designated exchange. State regulators argue it is sports betting with a different wrapper, and that sports betting has been a matter of state law since the federal ban on it was struck down.
The distinction matters because the two regimes impose entirely different costs. A federally regulated exchange self-certifies contracts and operates nationally under one rulebook. A sports betting operator licenses state by state, pays state-specific taxes, funds responsible-gaming programs, and accepts limits on advertising and market access that vary by jurisdiction. Moving from the first world to the second is not a compliance tweak. It changes the unit economics of the business.
For most of the past two years the platforms had the better of the argument in the lower courts, winning injunctions that kept state cease-and-desist letters at bay. The appellate picture is now moving in the other direction. Two circuits finding a role for state regulators is not a nationwide rule, but it is the kind of accumulation that appellate judges elsewhere notice and that district courts cite.
Why a split among circuits is the real headline
Federal appeals courts bind only the states within their circuit. That means a sports event contract can be lawfully offered to a user in one part of the country and be subject to a state gaming enforcement action a few hundred miles away. Platforms operating a single national order book cannot easily run two legal regimes through one market: liquidity is pooled, and pulling users out of particular states fragments the very depth that makes the pricing credible.
Divergence among circuits is also the classic trigger for Supreme Court review. Nothing in the current posture guarantees the justices will take the question, but a genuine conflict over whether federal derivatives law displaces state gaming law — involving a fast-growing consumer product and a federal regulator's jurisdiction — is close to the template the court looks for. In the meantime, the platforms face a choice between geofencing contested states, seeking further review, or negotiating with state regulators from a weaker position than they held a month ago.
The exposure extends well past Kalshi
Kalshi is the named party, but it is not the only business with money in this outcome. Polymarket has pushed into the US market with a comparable event-contract model. Retail brokerages have added event contracts to their apps as a trading product alongside equities and options, betting that the category becomes a durable revenue line rather than a novelty. Each additional distribution partner increases the number of firms that now have to think about state gaming law.
Kalshi is the named party, but it is not the only business with money in this outcome.
Market-data vendors, clearing infrastructure and the sports leagues themselves sit downstream of the same question. Leagues have spent years negotiating data and integrity agreements with licensed sportsbooks under state frameworks. An unregulated-by-states parallel channel was always going to draw their attention, and a ruling that restores state authority gives them a more familiar counterparty to deal with.
The ruling landed at the end of a calm session in the broader market. The S&P 500, tracked by the SPDR S&P 500 ETF Trust, closed at $771.35, up 0.54% from the prior close of $767.18, with a day range of $766.29 to $772.28. The Nasdaq 100 proxy finished at $744.50, up 0.46%, and the Dow 30 proxy closed at $517.49, up 0.94%, all as of the last trade at 20:00 GMT on September 25, 2026. Neither Kalshi nor Polymarket is publicly listed, so there is no share price through which the market can price the decision directly — the read-through will show up instead in the valuations set in private funding rounds and in the disclosures of the listed brokerages that carry these contracts.
What to watch from here
Three things will determine how much this ruling ultimately costs the platforms. The first is whether Kalshi seeks further review, and whether any court agrees to hear it — the appellate record is now building toward a question the Supreme Court could plausibly resolve. The second is how aggressively state gaming regulators act on the authority the courts have restored; enforcement letters and license demands are cheap to send and expensive to fight. The third is whether the federal regulator moves to clarify the treatment of sports event contracts by rule rather than leaving the boundary to be drawn case by case in litigation.
For users, nothing changes immediately. Contracts that were live before the ruling do not vanish because of it. But anyone treating these markets as a permanent, nationally uniform product should read two appellate losses in under a month as evidence that the regulatory perimeter is still being drawn, and that it is being drawn tighter than the platforms hoped.
Key facts
- Ruling: Federal appeals court held that states can regulate Kalshi's sports prediction markets
- Date: September 25, 2026
- Pattern: Second appellate decision in under a month finding a state role in sports event contracts
- Market close (SPY): $771.35, +0.54%, as of 20:00 GMT Sept 25, 2026
Frequently asked questions
What is a sports event contract?
It is a derivative whose payout depends on whether a stated outcome occurs — for example, which team wins a game. Platforms list them on federally regulated exchanges and treat them as futures products. State gaming regulators argue that when the underlying event is a sporting result, the contract functions as a wager and falls under state betting law.
What did the appeals court actually decide?
The court ruled that states may regulate Kalshi's sports prediction markets, rejecting the argument that federal commodities law completely displaces state authority over these products. It is the second appellate decision in less than a month to find that states retain a role in overseeing sports-related event contracts.
Does this shut down Kalshi's sports markets?
Not by itself. Appellate rulings of this kind generally determine who has authority to write and enforce rules rather than closing a market immediately. The practical consequence is that state gaming regulators regain leverage to demand licensing, impose conditions, or pursue enforcement within the states covered by the ruling.
Why does a disagreement between circuits matter?
Federal appeals courts bind only the states in their circuit, so the same product can be treated differently in different parts of the country. That is difficult for a platform running one national order book. A genuine conflict among circuits is also one of the main reasons the Supreme Court agrees to take a case.
Which other companies are affected?
Polymarket operates a comparable event-contract model in the US, and several retail brokerages have added event contracts alongside equities and options. Any firm distributing sports-related event contracts now has to weigh state gaming law. Sports leagues and data providers, which already deal with licensed sportsbooks under state frameworks, also sit downstream.
Can investors trade Kalshi or Polymarket shares?
No. Both are privately held, so there is no listed equity through which public-market investors can express a view on the ruling. The financial impact will instead appear in private valuations and, indirectly, in the disclosures of publicly traded brokerages that offer event contracts to their customers.
