Kalshi seeks en banc rehearing as tribal prediction-market fight shifts

The prediction-market litigation that has occupied Indian Country for most of 2026 has moved from merits argument to procedural maneuvering. Kalshi, the federally designated contract market whose sports event contracts tribes say function as unlicensed Class III gaming, filed a petition for rehearing en banc at the U.S. Court of Appeals for the Ninth Circuit on Sept. 9, asking the full court to revisit a panel decision that went against the exchange in its dispute with Nevada regulators. One week later, on Sept. 16, a separate Ninth Circuit panel handed tribal plaintiffs the most consequential ruling yet on the same underlying question.

For tribal operators, the two tracks now run in parallel, and the procedural posture matters nearly as much as the reasoning. Neither a rehearing grant nor a denial would resolve whether sports event contracts can be offered to players sitting on Indian lands. What they will determine is how quickly that answer arrives, and from which court.

What the September panel decision held

In Blue Lake Rancheria v. Kalshi, brought by Blue Lake Rancheria and the Chicken Ranch Rancheria of Me-Wuk Indians, the panel concluded that the tribes are likely to succeed on the merits of their claim that Kalshi's sports contracts violate the Indian Gaming Regulatory Act when offered to users physically located on tribal land. It is the first circuit-level decision to address prediction markets from the tribal side rather than through a state regulator's enforcement authority, and that framing is the point.

Two holdings do the heavy lifting. First, the panel treated the location of the bettor, not the location of the exchange's servers or its federal designation, as the operative fact: a wager occurs where the person placing it stands. Second, the panel accepted that a tribe may enforce its own gaming regime against an operator that never signed a compact and never sought a tribal license. Taken together, those propositions convert IGRA from a framework governing tribal-state bargaining into a source of affirmative tribal enforcement authority against a remote commercial actor.

The panel reversed in part the district court's November 2025 denial of preliminary injunctive relief and remanded for consideration of the remaining injunction factors. That is a narrower outcome than the headlines suggested. The tribes have not yet obtained an injunction; they have obtained a ruling that the district court applied the wrong merits analysis and must try again. Our earlier breakdown of the Blue Lake Rancheria decision walks through the panel's IGRA construction in detail.

Why en banc review is a long shot

Kalshi's Sept. 9 petition arises from the separate Nevada matter and argues that the panel's reasoning conflicts with federal commodities law and with an April decision from the Third Circuit. A genuine circuit split is the strongest argument available to a party seeking full-court review, and it is also the classic hook for a petition for certiorari at the Supreme Court. Robinhood, which offers event contracts through a partner exchange, has separately signaled that it intends to seek cert.

The statistical picture is unforgiving. In fiscal 2025 the Ninth Circuit received 730 petitions for rehearing en banc and granted 11 of them, a rate of roughly 1.5 percent. Rehearing is reserved for decisions that conflict with binding circuit precedent or that present a question of exceptional importance, and a panel that has just issued a second ruling in the same direction is not an obvious candidate for reversal by its own colleagues. The more realistic function of the petition is to preserve the issue and to extend the timeline while the Supreme Court considers whether to take up the broader question.

The distinction that matters for operators is between a ruling about what federal law permits and a ruling that produces an enforceable order. Only the latter changes what appears on a phone screen inside a casino's geofence.

What operators should watch on remand

The immediate action returns to the district court, which must now work through the remaining preliminary-injunction factors: irreparable harm, the balance of equities and the public interest. Tribes have generally framed harm in terms of the exclusivity they purchased through compacts, arguing that an unlicensed competitor offering functionally identical wagers erodes the consideration underlying revenue-sharing payments. That argument is stronger where a state's compact expressly conditions payments on exclusivity, which is why the structure of the underlying compact is doing quiet work in these cases.

Three practical questions follow. The first is scope. An injunction limited to two rancherias in Northern California is a very different instrument from one that reaches every tribal jurisdiction in the circuit, and courts have been reluctant to grant relief broader than the plaintiffs before them. The second is compliance mechanics. Geofencing to the boundaries of Indian lands is technically achievable, but boundaries are irregular, trust parcels are often noncontiguous, and no exchange currently maintains that dataset at the precision a court order would demand.

The third is the interaction with the federal regulator. The Commodity Futures Trading Commission's posture toward sports event contracts remains the variable that could moot much of this litigation, and tribal organizations have spent the year pressing for formal consultation on that point. Our coverage of how event contracts intersect with IGRA exclusivity traces the regulatory argument tribes have been making in parallel with the courtroom one.

Meanwhile, state-level enforcement continues on its own track, and a growing number of gaming regulators have issued cease-and-desist orders against exchanges operating in their jurisdictions. Those actions do not depend on the Ninth Circuit's IGRA analysis, and they have produced faster results than federal litigation in several states.

The timeline question

If the Ninth Circuit denies rehearing, as the base rate suggests it will, the panel decision stands and the pressure moves to the Supreme Court, where a cert petition from any of the exchanges would arrive with a plausible split. If the court grants rehearing, the panel opinion is vacated and the tribal ruling's persuasive weight in other circuits diminishes considerably, even though Blue Lake Rancheria itself is a separate case.

For tribal enterprises budgeting for fiscal 2027, the planning assumption should remain unchanged: no appellate outcome in the next two quarters is likely to remove event contracts from the market, and revenue models that assume a court-ordered cleanup are premature. Operators in states where exclusivity payments are large relative to net revenue have the most at stake, and the California market, where the plaintiff tribes sit, remains the bellwether.