Massachusetts vs Kalshi: What the Amended Lawsuit Means for Prediction Markets Compliance

A Suffolk County judge has allowed Massachusetts to expand its lawsuit against prediction markets platform Kalshi, adding detailed allegations of unlicensed sports wagering and targeted marketing to users under 21. The ruling sharpens a jurisdiction battle that now sits squarely between state gambling regulators and a federal agency claiming exclusive authority, and it has real consequences for any firm advising on, auditing, or onboarding event-contract platforms in the United States.

What the Amended Complaint Adds

Core allegations in the 71-page filing

Associate Justice Peter Krupp of Suffolk County Superior Court granted the Massachusetts Attorney General permission to file a substantially expanded complaint on the same Tuesday that the ruling was issued. The original action, brought by Attorney General Andrea Joy Campbell in September 2025, alleged that Kalshi needed a licence from the Massachusetts Gaming Commission before offering online sports wagering in the state.

The amended filing keeps that core claim but layers on a separate set of concerns about how the platform acquires customers. Specifically, it alleges that Kalshi markets to university campuses and uses advertising imagery featuring individuals who appear to be younger than 21. Under the complaint's framing, Kalshi allows account creation and sports-event contract trading from age 18, which the state argues falls below the threshold Massachusetts requires for sports wagering.

The earlier injunction and current status

An injunction barring Kalshi from offering sports event contracts in Massachusetts was granted in January while the underlying case remained under review. That order remains relevant context: the state has already obtained interim relief once, and the expanded complaint signals that regulators intend to press the matter on multiple fronts simultaneously.

The Federal Counterargument: CFTC's Jurisdiction Claim

How the CFTC frames event contracts

The US Commodity Futures Trading Commission entered the Massachusetts litigation in April, filing an amicus brief arguing that it holds exclusive jurisdiction over prediction markets. The CFTC's position rests on the Commodity Exchange Act: the agency characterises event contracts traded on platforms like Kalshi as swaps, which are federal instruments sitting outside state regulatory reach.

CFTC Chair Michael Selig stated publicly that Congress has assigned the agency sole authority over commodity derivatives markets, including prediction markets, and warned any state seeking to assert its own authority that the CFTC would contest those efforts in court. That is an unusually direct posture for a federal regulator toward state attorneys general.

Why the legal theory matters beyond Massachusetts

If the CFTC's reading prevails, state gaming commissions across the US would lose the ability to require prediction markets platforms to hold state gambling licences. If Massachusetts prevails, every state could theoretically impose its own licensing regime and age-verification standards on the same platforms. Neither outcome is settled, and the litigation is still moving through a state trial court, meaning appeals are almost certain regardless of how Judge Krupp ultimately rules.

For compliance teams and auditors, this creates a live ambiguity: the applicable regulatory framework for a client operating an event-contract platform depends on which jurisdiction's legal theory holds, and right now both remain viable. Firms should document their position on the relevant framework and review it each time a material development occurs in this litigation. The same discipline applies to OFAC SDN cryptocurrency addresses and compliance priorities where overlapping federal and state obligations frequently require separate analysis.

Youth Targeting: A Distinct Compliance Risk

What the allegations mean for AML and KYC programmes

The age-related allegations in the amended complaint are not just a public-relations problem. They indicate a potential weakness in Kalshi's know-your-customer controls. Allowing users aged 18 to 20 to open accounts and trade sports event contracts may be lawful at the federal level if the CFTC's swap theory holds, but it can still conflict with state gambling statutes that set higher age thresholds.

Accounting firms and auditors conducting AML or KYC reviews for prediction markets clients should treat age-verification processes as a scope item. Questions to ask include: how does the platform verify age at onboarding, does it apply enhanced controls for users close to any applicable age threshold, and does its marketing review process screen for imagery or audience demographics that might imply targeting below the relevant limit?

Robust blockchain analytics data quality and due-diligence questions become particularly relevant when a platform's on-chain activity cannot be cleanly separated from off-chain wagering records, as is often the case with event-contract structures.

The Legislative Angle: CLARITY Act and Congressional Pressure

Proposed statutory fix and industry opposition

Separate from the courtroom, a coalition of national gaming organisations, tribal gaming groups, and labour bodies sent a letter this month asking Senate negotiators to insert language into the Digital Asset Market Clarity Act, known as the CLARITY Act, that would explicitly prohibit event contracts tied to sports and casino-style gaming. The bill is currently under Senate consideration and is designed primarily to expand CFTC authority over digital assets more broadly.

If that language were adopted, it would effectively resolve the state-versus-federal debate by removing sports prediction contracts from CFTC jurisdiction entirely, leaving them subject to state gambling law. That outcome would align with the Massachusetts AG's position but would also reshape the business model of any platform currently relying on the CFTC's swap classification to operate nationally without state licences.

Firms advising clients in the prediction markets space should monitor the CLARITY Act closely. A statutory prohibition would be faster-moving and more definitive than a court ruling, and it could require rapid changes to client compliance programmes.

Practical Steps for Compliance Teams

Immediate review priorities

The Massachusetts development is a prompt to audit several areas for any client touching prediction markets or event-contract structures:

• Licence mapping: identify every state where the client operates and check whether that state has pursued, threatened, or signalled any action against prediction markets platforms.
• Age verification: confirm that onboarding controls meet the highest applicable age threshold in any state where users are accepted, not just the federal minimum if one exists.
• Marketing review: screen advertising materials and audience-targeting parameters for any content that could be read as directed at users below the relevant threshold.
• Regulatory framework documentation: record the legal basis on which the client treats its products as federally regulated swaps rather than state-licensed gambling, and flag this as subject to change as litigation and legislation develop.
• CLARITY Act watch: set a monitor on the bill's progress and identify the compliance changes a sports-contract prohibition would trigger.

This is not a situation where a single legal opinion obtained at launch remains adequate. The framework is actively contested, and firms that cannot show they have updated their analysis in light of material developments face professional and reputational exposure.

FAQ: Massachusetts vs Kalshi and Prediction Markets Compliance

What did the Massachusetts court actually rule?

Associate Justice Peter Krupp granted the state's request to file a 71-page amended complaint against Kalshi. The ruling allows Massachusetts to add new allegations, including marketing to users under 21, on top of its existing claim that the platform operated without the required Massachusetts Gaming Commission licence.

Why does the CFTC think it overrides state law here?

The CFTC argues that event contracts on prediction markets are swaps under the Commodity Exchange Act, which gives the federal agency exclusive regulatory authority. On that reading, state gambling licence requirements simply do not apply. Massachusetts disputes this characterisation, treating the contracts as online sports wagers subject to state oversight.

What is the CLARITY Act's relevance?

The Digital Asset Market Clarity Act, currently under Senate review, would expand CFTC authority over digital assets. Industry and gaming groups are lobbying to include a provision that explicitly excludes sports and casino-style event contracts from that expanded authority, which would hand states the regulatory power they are currently claiming in court.

Does this affect prediction markets platforms that don't operate in Massachusetts?

Yes, in practice. Other states have brought or signalled similar actions. The legal arguments being tested in Massachusetts, particularly the CFTC's exclusive-jurisdiction claim, will influence how courts elsewhere rule. A Supreme Court resolution is possible if conflicting rulings emerge across circuits.

What should accounting firms do right now for prediction markets clients?

Update state-by-state licence mapping, review age-verification and marketing controls, document the legal basis for treating event contracts as federally regulated instruments, and set active monitoring on both the Massachusetts litigation and the CLARITY Act's progress through the Senate.

Source: Cointelegraph