Leading prediction market Kalshi is facing mounting legal problems this week. The class action suit, filed this week in the Southern District of New York, marks one of biggest legal challenges yet to the company’s event-contract model. The case alleges the platform has been running an unlicensed online sports betting platform and misleading users about how its markets work. The suit seeks repayment for user losses, certification of a nationwide class, and a jury trial. It also requests enhanced damages under various state laws.
The action comes during a period of uncertainty for the prediction market, with Kalshi also facing cease-and-desist orders from multiple state-level judiciaries.
Lawsuit Challenges Kalshi’s Core Business Model
According to the filing, Kalshi allows users to “trade” on sports outcomes. These include team-based markets and player-performance questions that closely resemble bets offered by licensed betting operators. Users can choose outcomes for NFL games or select totals for individual players, such as whether a quarterback will reach a specific touchdown count.
The plaintiffs argue that Kalshi markets these contracts as federally regulated event products while concealing the true nature of the trades. They claim users believe they are matched against other customers. Instead, the suit says users are often matched against market-making entities linked to Kalshi or against external firms that provide liquidity.
The complaint names Kalshi Trading LLC, KalshiEx LLC, and hedge fund partners as examples of counterparties that allegedly act as the House. The filing claims users are never clearly told when they are trading against these groups.
Plaintiffs Allege Deceptive Conduct
The suit states that Kalshi misled users through its marketing and platform design. It claims the company promoted its markets as fairer than traditional sportsbooks while operating without a gambling license in states that require one. Plaintiffs argue that Kalshi’s public statements caused consumers to believe they were engaging in regulated financial activity, not placing sports bets.
The complaint accuses the company of violating gambling laws, consumer-protection statutes, and unfair-competition rules in multiple jurisdictions. It cites alleged violations in New York, California, Florida, and other states included in the proposed class.
Plaintiffs claim Kalshi collected large volumes of wagers under false pretenses. They say the company profited from offering sports markets that should have been regulated as gambling.
Kalshi Disputes The Allegations
A Kalshi spokesperson said the lawsuit misunderstands how designated contract markets operate. The company says the claims lack merit and that it will respond fully in court filings. Kalshi maintains that its platform is regulated at the federal level by the Commodity Futures Trading Commission and that state gambling laws do not apply.
Kalshi, like other prediction-market operators, has self-certified its contracts with the CFTC. The company argues this process places its activity under federal oversight and separates its markets from sports betting conducted through licensed operators.
The lawsuit directly challenges that position. Plaintiffs contend that federal classification does not exempt platforms from state gambling rules when contracts involve sports outcomes.
Suit Expands Pressure Following Major Nevada Ruling
The class-action filing follows a significant setback for Kalshi earlier this week. A federal judge in Nevada overturned an earlier ruling that had protected the platform from state enforcement. The court found that Nevada regulators may pursue action against Kalshi for offering unlicensed sports markets.
Nevada’s gaming board has already warned that it will enforce state law against Kalshi and other companies offering sports-event contracts in the state. The ruling strengthened regulators’ authority and renewed scrutiny of Kalshi’s operations.
The new lawsuit in New York adds another layer of legal pressure at a time when several states are taking action. Massachusetts, Ohio, New Jersey, and Maryland each have ongoing disputes with the company. Tribal gaming regulators have also initiated actions involving activity on tribal lands.
Complaint Says Platform Is Driven By Sports Markets
The lawsuit argues that Kalshi relies heavily on sports activity. It cites figures indicating that sports contracts accounted for a majority of the company’s trading volume during parts of 2025. Plaintiffs say this shows Kalshi operates as a sports betting operator rather than a diverse prediction market.
They also allege that Kalshi has marketed itself as a legal alternative to traditional betting platforms, despite lacking state licensing. The complaint claims the company has described its sports contracts as “legal sports betting” in communications with users, contradicting its public position that it is a financial exchange.
Industry Disruption: Are More Suits On The Way?
The case arrives at a critical juncture for Kalshi. Prediction markets have surged in popularity in 2025, attracting huge revenues as well as a raft of partnerships with existing brands and platforms.
However, this expansion has come with heightened judicial scrutiny. As well as the ongoing legal challenge from Nevada federal courts, the platform also faces cease-and-desist orders from a number of states looking to crack down on its activities, including Arizona, Illinois, Maryland, New Jersey, Montana and Ohio.
Federal policy has shifted under the Trump administration, allowing Kalshi to launch sports markets after years of opposition from the CFTC. However, that move has fueled conflict between federal oversight and state gambling authority as prediction markets gain national attention.
Critics say Kalshi avoids age limits, tax requirements, and consumer-protection rules that licensed operators must follow. The class-action complaint filed this week may accelerate those reviews.
Why Does This Matter?
Kalshi must now defend itself on multiple fronts. The class-action lawsuit in New York joins an expanding list of regulatory and legal disputes in several states. Courts will decide whether Kalshi can continue offering sports-event contracts under federal oversight or whether state gambling laws apply.
The outcome could affect not only Kalshi but the broader prediction-market sector. Companies, investors, and regulators are watching the cases closely as they consider the future of event-based trading in the US.
