140+ Tribal Nations Ask Supreme Court to Review Kalshi Sports Contracts

More than 140 Tribal Nations and tribal organizations have asked the U.S. Supreme Court to take up the fight over sports event contracts, filing an amicus brief on October 8, 2026 in Flaherty v. KalshiEX. The filing, prepared by the Native American Rights Fund and the firm Zimmer, Citron & Clarke LLP, urges the justices to grant certiorari and to reject the argument that prediction market platforms may offer sports-related contracts on Indian lands without tribal authorization. For the tribal gaming industry, the Supreme Court petition on prediction markets is the clearest sign yet that the dispute is moving from regional litigation toward a national test of the Indian Gaming Regulatory Act.

What the tribal coalition is asking the Court to do

The amicus brief makes a plain claim: sports-event contracts are sports bets, whatever label the platform attaches to them. The coalition argues that when such contracts are offered to customers on Indian lands, they fall within the gaming activity that IGRA reserves for tribal governments and, for Class III games, for negotiated tribal-state compacts. Because the platforms operate without tribal authorization, the brief contends, they bypass both the compact framework and the regulatory oversight that tribal gaming commissions and the National Indian Gaming Commission apply to licensed operators.

A second argument concerns statutory structure. Kalshi and similar companies rely on the Commodity Exchange Act, which was amended in 2010 to address swaps. The tribal brief says that addition did not silently displace decades of federal, state and tribal gaming law. It cites the Ninth Circuit, which rejected the preemption reading and described it as a “wrecking ball” to the gaming framework. The brief also stresses consumer and integrity protections, arguing that the platforms operate with minimal oversight and claim exemption from the rules that apply to licensed sports betting.

Finally, the brief ties the legal question to public finance. Tribal governments fund health care, education, housing and public safety from gaming income, and the coalition argues that diverted wagers are a direct harm to those services. That economic framing matters at the certiorari stage, where the Court looks for questions of national importance. Readers who want the underlying statutory background can consult the Legal Guide to IGRA and Class III gaming.

The circuit conflict behind the petition

The brief points to a division among federal appeals courts. The Ninth Circuit, in an opinion dated September 16, 2026 in Blue Lake Rancheria v. Kalshi, found that the plaintiff tribes were likely to succeed on their IGRA claims, treated a customer's participation from tribal land as enough to bring a transaction within IGRA, and rejected the contention that the Commodity Exchange Act displaces the statute. The panel did not issue an injunction; it remanded the IGRA claim so the district court could weigh the remaining preliminary-injunction factors. The Third Circuit, according to the coalition, reached the opposite conclusion in the New Jersey case, and New Jersey has since asked the Supreme Court to review it, as reported by gaming trade outlets.

A genuine split among circuits is among the most common reasons the Court agrees to hear a case, though it is never a guarantee. The tribal brief says the conflict is exactly the kind that requires national resolution, because a platform's legal status should not depend on which side of a circuit line a customer happens to stand on. Earlier coverage on this site traced how the Ninth Circuit reached its result; see our analysis of the Blue Lake Rancheria ruling and the survey of the circuit split and its tribal implications.

What to watch next

Several practical questions follow. The first is procedural: the Court will decide whether to grant review after the parties and amici have filed, and a grant is far from assured. A denial would leave the split in place and push the dispute back to lower courts, where tribes in the Ninth Circuit would hold a stronger position than tribes elsewhere. A grant would set up briefing on the merits and a decision on the central preemption question, with consequences for every compact that grants a tribe exclusive rights to offer sports wagering.

The second question is political. The coalition is not relying on courts alone. At the Global Gaming Expo, tribal leaders described a strategy that combines litigation, congressional advocacy and alliances, and federal bills to restrict prediction markets have so far stalled. Industry observers note that the platforms and their regulator maintain that the contracts are federally authorized investment instruments rather than gambling, which is why the Supreme Court may ultimately be the forum that decides the matter.

The third question is whether tribal opinion remains united. A handful of tribes have signed agreements with Kalshi-backed apps, a development covered in our analysis of fractures in the tribal consensus. The size of the 140-plus signatory list nonetheless shows that opposition remains the dominant position across Indian country. For compact states such as California and Oklahoma, where exclusivity underpins revenue-sharing arrangements, the outcome could shape how future compact negotiations treat online and event-based wagering.

TribalGaming.com will follow the docket as filings are posted. Until the Court acts, the practical landscape remains uneven: strong Ninth Circuit authority for tribes, contrary reasoning in the Third Circuit, and a national industry waiting to learn which view will govern.

It is worth separating what the brief asks from what it cannot achieve. An amicus filing does not add claims or parties, and the Court is free to deny review regardless of how many governments sign. Even so, a filing of this breadth documents that the question reaches well beyond a single company or a single state. It reaches compact negotiations, tribal regulatory budgets and the expectations of lenders who underwrite tribal casino projects on the assumption that exclusivity will hold. Those downstream effects are part of why the tribal bar treats the petition stage as consequential, and why industry attorneys expect the next several months of filings to shape strategy well before any merits ruling.

For operators and regulators, the immediate task is preparation rather than prediction. Tribal gaming commissions are reviewing how their ordinances and compacts address event-based wagering, and several states have begun to examine whether compact language is clear enough to cover new product categories. The answers will differ by state, which is one more reason a single national rule would be valuable to the industry whichever way it comes out.