New York filed suit against KalshiEX LLC on July 31, 2026, seeking treble damages and per-offering fines that could exceed $36 billion, marking the largest single-state enforcement action against a prediction market operator. The lawsuit, brought jointly by Governor Kathy Hochul and Attorney Gene...
"No matter what they call themselves, prediction markets like Kalshi are gambling platforms, plain and simple." — Letitia James, Attorney General of New York
New York filed suit against KalshiEX LLC on July 31, 2026, seeking treble damages and per-offering fines that could exceed $36 billion, marking the largest single-state enforcement action against a prediction market operator. The lawsuit, brought jointly by Governor Kathy Hochul and Attorney General Letitia James, alleges Kalshi operates an unlicensed gambling business in violation of state gaming law, two days after a Wisconsin federal judge denied the CFTC's bid to block that state from enforcing its own gambling statutes against prediction platforms.
The action lands at an inflection point. Prediction market monthly notional volume has climbed from under $5 billion in mid-2025 to approximately $24 billion by April 2026, according to Pew Research Center. Kalshi alone reported $31 billion in notional volume for June 2026, with an annualized revenue run rate of $3.5 billion and a $22 billion private valuation from its May 2026 Series F. The legal question at the center — whether CFTC-regulated event contracts are federally preempted derivatives or state-regulated gambling — remains unresolved across at least seven jurisdictions, with courts issuing contradictory rulings.
The complaint, filed in New York State Supreme Court, centers on three claims. First, that Kalshi has operated a gambling business in New York without obtaining a license from the New York State Gaming Commission since launching sports-related contracts in 2025. Second, that the platform permits users aged 18-20 to place wagers, violating New York's 21-and-over requirement for mobile sports betting. Third, that Kalshi has evaded tax obligations that licensed gaming operators must pay.
The state seeks the following remedies:
The $36 billion figure derives from the per-offering calculation rather than actual revenue. According to Reason, the penalty structure treats each individual contract offering as a separate violation, producing an aggregate figure that dwarfs even the company's private valuation.
Governor Hochul framed the action as consumer protection: "Kalshi has chosen to ignore New York's gaming laws, which exist to protect consumers, prevent problematic gambling, deliver funding for critical public services, and ensure that every company plays by the same rules."
The New York Gaming Commission had previously issued a cease-and-desist order against Kalshi in October 2025. The company continued operating in the state.
Kalshi's growth trajectory contextualizes why states are paying attention. Key metrics:
| Metric | Value | Period | |--------|-------|--------| | Private valuation | $22 billion | May 2026 (Series F) | | Series F raise | $1 billion | May 2026 | | Annualized revenue run rate | $3.5 billion | June 2026 | | Monthly notional volume | $31 billion | June 2026 | | Revenue, Dec. 2024 | ~$25 million (annualized) | Dec. 2024 | | Revenue, Dec. 2025 | ~$735 million (annualized) | Dec. 2025 | | New users during World Cup | 3 million | June-July 2026 | | US prediction market share | ~73% | Early July 2026 |
The company's valuation rose from $2 billion in June 2025 to $22 billion by May 2026, an 11x increase in nine months. Investors include Coatue (lead), Sequoia, Andreessen Horowitz, IVP, Paradigm, Morgan Stanley, and ARK Invest. Sports-related contracts — particularly NBA Finals and FIFA World Cup markets — drove the acceleration.
Polymarket, the second-largest platform, posted $7.08 billion in May 2026 volume, down 21% from its March peak. DeFi Rate estimates Kalshi held roughly 73% of US prediction market share in early July, against Polymarket's 27%.
For broader context, TRM Labs data shows that 840,000 unique monthly wallets were active across on-chain prediction markets (Polymarket, LIMITLESS, Opinion Market, predict.fun) as of February 2026, nearly triple the figure from six months prior. Geopolitics, macroeconomics, and US politics — not sports or crypto — drove the majority of on-chain volume. The top five markets by volume in February 2026 were geopolitical (Iran strikes, $252.7 million), US politics (Fed Chair nomination, $125.1 million), macro/finance (Fed decisions, $115.6 million), US politics (government shutdown, $82.0 million), and geopolitical (Iran leadership, $48.2 million).
The core legal question dividing courts: does the Commodity Exchange Act (CEA) grant the CFTC exclusive jurisdiction over event contracts traded on registered Designated Contract Markets (DCMs), thereby preempting state gambling laws?
The CFTC's argument rests on four pillars, as detailed by Norton Rose Fulbright:
States counter that prediction market contracts are "quintessentially" gambling — wagers on uncertain outcomes that depend more on chance than skill. Judge Roth, dissenting in the Third Circuit's April 2026 ruling, wrote that the contracts are "virtually indistinguishable from betting products on online sportsbooks."
In Congress, Senators John Curtis and Adam Schiff introduced the Prediction Markets Are Gambling Act on March 23, 2026, which would amend federal law to prohibit sports and casino-style event contracts on CFTC-regulated platforms.
The legal landscape is fractured. As of July 31, 2026, enforcement actions against prediction market operators span at least seven states, with contradictory outcomes:
| State | Action | Outcome | Date | |-------|--------|---------|------| | New York | AG lawsuit (Kalshi) | Pending | July 31, 2026 | | New York | AG petitions (Coinbase, Gemini) | Pending | April 2026 | | Wisconsin | State lawsuit (Kalshi, Polymarket, Crypto.com, Robinhood, Coinbase) | CFTC preemption denied | July 29, 2026 | | New Jersey | State enforcement | Injunction granted for Kalshi (3d Cir.) | April 6, 2026 | | Arizona | Criminal prosecution (KalshiEX) | 20-count information filed | March 17, 2026 | | Illinois | Gaming Board cease-and-desist (Kalshi, NADEX, Polymarket US, Robinhood) | DOJ/CFTC challenge pending | April 2, 2026 | | Connecticut | Gaming Director enforcement | DOJ/CFTC challenge pending | April 2, 2026 | | Minnesota | State prediction market ban | Preliminary injunction granted (Kalshi, Polymarket) | 2026 |
Arizona stands out as the only state pursuing criminal charges — a 20-count information against KalshiEX including four election wagering counts and sixteen betting/wagering counts.
Two days before New York's lawsuit, US District Judge William Griesbach in Wisconsin denied the CFTC's request for a preliminary injunction on July 29, 2026. The ruling was a procedural setback for federal preemption.
Judge Griesbach found that the CFTC failed to demonstrate either irreparable harm or likelihood of success on the merits. The court held that CFTC registration does not automatically shield platforms from state gambling laws, and that the Commodity Exchange Act does not automatically cancel Wisconsin's gambling rules under Chapter 945.
The CFTC stated it was "disappointed" and confirmed it will appeal. Wisconsin had filed actions in April against Kalshi, Polymarket, Crypto.com, Robinhood, and Coinbase, alleging that sports contracts were offered without required gaming licenses.
The ruling contrasts with the Third Circuit's April 6, 2026 decision in KalshiEX LLC v. Flaherty, which affirmed a preliminary injunction preventing New Jersey from enforcing gambling laws against Kalshi's sports event contracts — holding that the CEA preempts state gambling law as applied to CFTC-licensed DCMs.
Courts are now split. Federal preemption has succeeded in New Jersey and Minnesota; it has failed in Wisconsin. The Supreme Court has not weighed in.
The CFTC under Chairman Mike Selig has positioned itself as the industry's primary regulator. Selig characterized New York's lawsuit as seeking to force an "unprecedented sudden shutdown of prediction markets nationwide."
On March 31, 2026, CFTC Director of Enforcement David Miller announced five enforcement priorities: insider trading in prediction markets, market manipulation (energy focus), market abuse/disruptive trading, retail fraud schemes, and AML/KYC violations. Miller stated: "The era of regulation by enforcement is over."
The CFTC published an Advance Notice of Proposed Rulemaking on March 16, 2026, and issued Letter No. 26-08 on March 12, 2026, to DCMs on event contracts, signaling formal rules rather than ad hoc enforcement.
This creates an unusual dynamic: a federal regulator actively fighting state-level enforcement actions to preserve its own jurisdictional authority, while simultaneously acknowledging it needs to write rules for an industry it claims to already regulate.
The economic stakes extend beyond Kalshi's operations. The prediction market sector now processes more than $24 billion in monthly volume and has attracted more than $2 billion in venture capital. The fee revenue flowing through these platforms — estimated at $3.5 billion annually for Kalshi alone — represents real economic value that states argue should be taxed and regulated under gaming frameworks.
From a value-distribution standpoint, the jurisdictional fight determines who captures economic rents. Under CFTC jurisdiction, platform operators retain revenue under federal exchange rules with no state gaming tax. Under state gaming frameworks, operators must obtain licenses, pay gaming taxes (which in New York can exceed 50% of gross gaming revenue for mobile sports betting), submit to state audits, and comply with age verification and responsible gambling mandates.
The $36 billion potential penalty in New York — however unlikely to be awarded at that level — illustrates the fiscal incentive driving state enforcement. New York's mobile sports betting market generated $709 million in state tax revenue in 2025, according to the New York State Gaming Commission. Each dollar of prediction market volume that flows through unlicensed channels represents lost tax revenue to the state.
For the broader Web3 ecosystem, the outcome will determine whether on-chain prediction markets — including Polymarket's Polygon-based infrastructure — can operate as nationally accessible financial products or must navigate a state-by-state licensing patchwork that would fundamentally alter their architecture and economics.
The New York lawsuit against Kalshi represents the highest-stakes state enforcement action in the prediction market sector's history, both in potential penalty size and jurisdictional implications. With federal courts split on preemption, the CFTC actively litigating against states, and Congress considering legislation that could resolve the question in either direction, the regulatory classification of prediction markets remains the most consequential open question in US financial market structure.
The economic value at stake is concrete. Kalshi's revenue run rate has grown from $25 million to $3.5 billion in eighteen months. That revenue either flows through federal exchange rails with no state gaming tax, or through state-licensed channels where gaming taxes can exceed 50% of gross revenue. The difference is measured in billions of dollars annually, and it will be settled in court.