Kalshi has suffered a significant legal setback after a federal judge ordered the prediction market operator to stop offering sports event contracts across two California tribal territories. The preliminary injunction, issued by U.S. District Judge Jacqueline Scott Corley according to the court order, marks the first such court victory for tribes seeking to restrict Kalshi's sports betting activities in the United States. The ruling surfaces the core conflict behind Kalshi's push into sports markets: whether contracts traded under federal commodities law can simultaneously amount to gambling under tribal gaming law.

The order applies to the territories of Blue Lake Rancheria and the Chicken Ranch Rancheria of Me-Wuk Indians. It covers sports-related contracts involving football, basketball, baseball, soccer, tennis, and Ultimate Fighting Championship (UFC) events.

Under the ruling, Kalshi must restrict access to the affected markets within the two territories. Judge Corley also instructed both tribes to submit maps identifying their territorial boundaries by November 13, while Kalshi is required to file a compliance report within 21 days detailing how it will enforce the restrictions.

Sports and gaming attorney Daniel Wallach described the decision as a major development in tribal gaming litigation. In a November 5 post on X, Wallach said it was the first preliminary injunction tribes had obtained against Kalshi nationwide.

Ninth Circuit Ruling Strengthened the Tribes' Case

The dispute dates back to July 2025, when Blue Lake Rancheria and Chicken Ranch Rancheria filed a lawsuit accusing Kalshi of providing unauthorized gambling services within territories protected by federal tribal gaming laws.

The tribes argued that Kalshi's sports event contracts violated the Indian Gaming Regulatory Act and their respective tribal gaming ordinances. Their position was that the contracts constituted Class III gaming activities and therefore required authorization under the applicable tribal gaming regulations. Under IGRA, Class III gaming — the category that covers casino-style gambling and sports wagering — may only occur on tribal lands after being authorized through a compact negotiated between a tribe and the state.

Kalshi rejected that interpretation, arguing that its sports prediction products fall under federal commodities law. The company maintained that the Commodity Exchange Act gives the Commodity Futures Trading Commission (CFTC) exclusive jurisdiction over these contracts.

Judge Corley initially rejected the tribes' request for a preliminary injunction in November 2025. Such injunctions are interim remedies, and courts generally require the moving party to show it is likely to succeed on the merits — a showing the tribes had not made at that stage. The tribes subsequently appealed that decision to the Ninth Circuit Court of Appeals.

A significant turn came in September 2026, when a Ninth Circuit panel partially overturned the earlier ruling and sided with key elements of the tribes' legal arguments. The appeals court concluded that the tribes were likely to succeed on claims involving violations of federal gaming law. The panel also rejected Kalshi's argument that the CFTC's exclusive regulatory authority displaced the tribes' claims concerning the sports contracts. That likelihood-of-success finding provided the basis for the district court to impose restrictions on Kalshi's activities within the affected territories.

Parallel Legal Challenges in Arkansas and Utah

The California ruling comes as Kalshi faces separate legal disputes in other U.S. jurisdictions over whether its sports prediction markets constitute illegal gambling.

On November 5, Arkansas Attorney General Tim Griffin filed a lawsuit against the company, alleging that it operates illegal gambling services. Griffin argued that wagering money on the outcomes of Arkansas Razorbacks games qualifies as gambling under Arkansas law. The lawsuit raises a central question about Kalshi's business model: whether federally regulated sports event contracts can continue operating in states whose authorities consider them prohibited gambling activities.

Utah has also taken legal action against the prediction market operator. On October 29, prosecutors filed criminal charges against Kalshi and two company executives, accusing them of illegally promoting online gambling services within the state. In a separate civil case, Utah authorities also pursued legal action against Kalshi and two Susquehanna trading firms over alleged illegal gambling activities.

California Injunction Does Not Cover Nationwide Operations

Although the latest decision represents an important development in the broader dispute over prediction markets and tribal gaming rights, its immediate scope remains confined to the territories of Blue Lake Rancheria and Chicken Ranch Rancheria of Me-Wuk Indians. The injunction does not impose a nationwide suspension of Kalshi's sports contracts. Instead, it requires the company to restrict the specified markets within the two affected tribal territories.

The next steps are procedural: the tribes' boundary maps are due by November 13, and Kalshi's compliance report laying out its enforcement plan is due within 21 days of the order. Outside the two territories, no equivalent court order restricts Kalshi's sports contracts, leaving the underlying question to be tested in the pending Arkansas and Utah proceedings.

Nevertheless, the ruling adds to the mounting legal pressure surrounding Kalshi as tribal authorities, state prosecutors, and courts examine how sports prediction contracts should be regulated under existing gambling and federal commodities laws.