What is the Kalshi circuit split?

It's the conflict between two federal court rulings on the same legal question. On April 6, 2026, the Third Circuit ruled 2-1 in KalshiEX v. Flaherty that the Commodity Exchange Act preempts New Jersey's gambling law for Kalshi's sports event contracts. On July 8, 2026, a Southern District of New York judge ruled the opposite in KalshiEX v. Williams, finding New York's gambling law is not preempted. Two federal courts reached opposite conclusions on the same preemption question within three months.

Which ruling is more important, the Third Circuit's or SDNY's?

Neither controls nationally yet. The Third Circuit ruling is binding only within its circuit (Delaware, New Jersey, Pennsylvania, and the Virgin Islands); the SDNY ruling is a single district court decision now on appeal to the Second Circuit. Both are preliminary-injunction rulings — judgments about likelihood of success, not final decisions on the merits. Neither is a Supreme Court ruling, and no circuit court has yet weighed in on New York's case.

Will the Supreme Court resolve the Kalshi preemption question?

That's the most likely long-term outcome once a genuine circuit split matures. Right now there's a Third Circuit ruling for Kalshi and a district-court ruling against it in a different circuit — not yet two conflicting circuit-court opinions. If the Second Circuit affirms the SDNY ruling, or if the Fourth, Sixth, or Ninth Circuits (all with pending Kalshi cases) split from the Third Circuit, that creates the kind of direct circuit conflict the Supreme Court typically takes up. New Jersey is separately seeking Supreme Court review of the Third Circuit decision itself, with an extended filing deadline of August 4, 2026.

Can I still trade Kalshi sports contracts in New Jersey and New York?

As of this writing, yes in New Jersey (protected by the Third Circuit injunction) and, practically, still yes in New York while Kalshi's appeal to the Second Circuit is pending, though the SDNY ruling means New York's gambling law is not currently blocked by a federal injunction. Track the current state-by-state status on the Odds Reference legal tracker rather than relying on any single article, since rulings are arriving at a pace of several per month.

Does the circuit split affect Polymarket the same way?

Not directly. Both of these specific cases were brought by Kalshi. Polymarket is a defendant or plaintiff in several of its own state disputes (Massachusetts, Michigan, Nevada, among others), and the preemption theory being litigated is the same one, but no ruling described here was issued in a Polymarket case. See our Polymarket legal status explainer for that platform's separate regulatory history.

Kalshi's Circuit Split Explained: Third Circuit vs. SDNY

Two federal courts reached opposite conclusions on the same question within three months. On April 6, 2026, the Third Circuit ruled federal law preempts state gambling law for Kalshi’s sports contracts. On July 8, 2026, an SDNY judge ruled the opposite. Neither ruling is final or binds the other’s jurisdiction.

What Did the Third Circuit Actually Rule?

The Third Circuit affirmed a preliminary injunction shielding Kalshi from New Jersey enforcement, holding that the Commodity Exchange Act (CEA) preempts state gambling law for sports event contracts traded on a CFTC-registered exchange. The panel found “both field and conflict preemption apply” — the strongest form of federal preemption argument available.

The case, KalshiEX LLC v. Flaherty, No. 25-1922, traces back to New Jersey’s Division of Gaming Enforcement issuing Kalshi a cease-and-desist letter in early 2025. A federal district court granted Kalshi a preliminary injunction on April 28, 2025, and New Jersey appealed. Roughly a year later, the Third Circuit affirmed that injunction 2-1, becoming the first federal appellate court to rule squarely on whether the CEA’s grant of exclusive federal jurisdiction over swaps overrides state gambling enforcement against these products.

The majority reasoned that Congress gave the CFTC exclusive authority over commodity swaps, and that a state gambling statute applied to a CFTC-registered contract conflicts with that federal scheme. The dissent argued the opposite: that courts should presume against preemption in areas traditionally regulated by states (like gambling), that a single CFTC “special rule” permitting event contracts involving gaming doesn’t amount to the kind of comprehensive federal occupation required for field preemption, and that state gambling law and federal derivatives law can coexist without conflict.

This matters for what it is, and isn’t. It is a preliminary-injunction ruling — a judgment that Kalshi is likely to win on the merits, not a final decision that it has won. It binds only the Third Circuit (Delaware, New Jersey, Pennsylvania, and the Virgin Islands). And it arrived over a sharp dissent, meaning even within the panel that decided it, the preemption theory was not unanimous.

What Did the SDNY Ruling Say, and Why Does It Conflict?

Three months after the Third Circuit sided with Kalshi, a federal judge in New York reached the opposite conclusion on the identical legal question, using much of the same statutory text. That’s what makes this a split worth tracking rather than a one-off loss.

In KalshiEX LLC v. Williams, Judge Analisa Torres denied Kalshi’s request for a preliminary injunction against the New York State Gaming Commission on July 8, 2026, ruling that New York’s gambling law as applied to Kalshi’s sports event contracts is not preempted by the CEA. Torres — who also presided over the SEC’s case against Ripple — wrote that she would not read the CEA’s grant of exclusive federal jurisdiction as leaving “no room for supplementary state legislation.” She further noted that nothing prevents Kalshi from applying for a license under New York’s existing gambling framework rather than bypassing it entirely.

The case had been building since October 27, 2025, when Kalshi sued New York after receiving its own cease-and-desist letter. Unlike the Third Circuit’s 2-1 split decision, Torres’s ruling wasn’t close on its face — she found Kalshi had “not made a clear showing” it was likely to succeed on the preemption argument at all. Kalshi filed a notice of appeal to the Second Circuit the same day.

	Third Circuit (NJ)	SDNY (NY)
Date	April 6, 2026	July 8, 2026
Case	KalshiEX LLC v. Flaherty	KalshiEX LLC v. Williams
Outcome	Preemption applies — injunction affirmed for Kalshi	Preemption does not apply — injunction denied
Vote / margin	2-1 (appellate panel)	Single judge (district court)
Binding scope	Third Circuit only (DE, NJ, PA, USVI)	Persuasive only outside SDNY; on appeal to 2nd Circuit
Status	Final on preliminary injunction; NJ seeking Supreme Court review	Kalshi appealing to Second Circuit

For the full run of rulings that led to this point — including the parallel disputes in Maryland, Ohio, Tennessee, and Nevada — see the prediction markets legal timeline and the state-by-state map of every active dispute.

What Does “Circuit Split” Actually Mean Here?

A circuit split means two or more federal appellate courts reach conflicting conclusions on the same legal question. What exists today is narrower: one circuit-court ruling (Third Circuit, for Kalshi) and one district-court ruling (SDNY, against Kalshi), now on appeal to the Second Circuit.

That distinction creates genuine uncertainty about what the law requires depending on where you’re standing, and it isn’t just pedantic — it changes what happens next. If the Second Circuit affirms Judge Torres’s reasoning, that creates an actual circuit-level split against the Third Circuit’s position, the kind of direct conflict the Supreme Court is far more likely to resolve. If the Second Circuit reverses and sides with Kalshi, the SDNY ruling becomes a footnote rather than one half of a split. Either outcome is realistic, and neither has happened yet.

Complicating the picture further, similar preemption cases are pending in three other circuits, any of which could widen or narrow the eventual conflict before the Supreme Court has to weigh in at all. This NJ/NY split is also just one front: roughly 20 states nationwide currently have some form of dispute with Kalshi and/or Polymarket over sports contracts, and the CFTC has separately sued nine of those states directly to block their enforcement — a full appellate-level split here wouldn’t resolve most of that broader map on its own.

Circuit	States / parties	Status	Next milestone
Fourth	Maryland	Federal court denied Kalshi’s injunction (August 2025)	Appeal argued May 7, 2026; panel appeared skeptical of Kalshi’s position
Sixth	Ohio, Tennessee	District courts reached opposite conclusions from each other	Oral arguments scheduled July 30, 2026
Ninth	Nevada, Arizona, Washington, and a California tribal-sovereignty case	Mixed district-level rulings	Argued in stages through July 2026

For why sports contracts specifically — and not Kalshi’s election or economic contracts — are the source of nearly every one of these disputes, see our explainer on why sports event contracts became the legal flashpoint.

What Should Traders Actually Do With This Information?

In practical terms, the circuit split changes almost nothing about what’s tradeable on Kalshi today, but it changes how much confidence to place in “it’s legal” claims from any single source. New Jersey is protected by the Third Circuit’s injunction; New York’s status is complicated by SDNY’s ruling and pending appeal.

The practical takeaway for a trader is not to treat either ruling as the final word. Check the state-by-state prediction markets legal tracker for your specific state before assuming a national rule applies, since the fight is playing out state by state and circuit by circuit rather than resolving all at once. If you’re new to Kalshi and weighing whether to open an account given this legal uncertainty, the Kalshi signup guide covers the current onboarding process and where the platform stands contract-by-contract, and the Kalshi platform profile covers its regulatory structure in more depth. Polymarket faces a parallel but separate set of state disputes brought under its own name; see our Polymarket legal status explainer for that platform’s regulatory history. Wherever you’re eligible to trade, review our responsible gambling resources before funding an account.

None of this is legal advice, and nothing here predicts how the Second Circuit, the other pending circuit appeals, or an eventual Supreme Court petition will come out. This reflects the state of the law as we last verified it on July 19, 2026, sourced to the actual court opinions linked above and the law-firm client alerts analyzing them.

The Odds Reference dashboard tracks live prices across Kalshi, Polymarket, and other platforms — useful context for watching whether cross-platform pricing on sports markets shifts as the legal picture in individual states changes.

Key Takeaways

The Third Circuit ruled 2-1 for Kalshi on federal preemption (April 6, 2026, KalshiEX v. Flaherty); SDNY ruled against Kalshi on the identical question three months later (July 8, 2026, KalshiEX v. Williams).
Both rulings are preliminary-injunction decisions, not final merits rulings — each reflects a judgment about likelihood of success, not a closed case.
Strictly speaking there’s no circuit split yet — one circuit-court ruling and one district-court ruling now under appeal to the Second Circuit. A true split requires two conflicting appellate rulings.
Similar preemption cases are pending in the Fourth, Sixth, and Ninth Circuits, any of which could widen or narrow the eventual conflict before the Supreme Court gets involved.
Check the state-by-state legal tracker for current status by state — the practical effect of this split varies by where you’re trading from, not by a single national answer.