Robinhood Lawsuit Alleges Prediction Market Duped Traders Into Gambling on Sports
Posted on: June 15, 2026, 12:45h.
Last updated on: June 15, 2026, 12:45h.
- Robinhood is accused of running an illegal sports betting enterprise
- The federal complaint was filed in California’s Northern District Court
Robinhood is named in a proposed class-action lawsuit on allegations that the financial services company deceived customers by offering unlicensed sports gambling disguised as a financial instrument.
In what’s one of the country’s first major private class-action cases against a prediction market on allegations of offering illegal trading on sports events, plaintiff Matthew Mazza is seeking the recovery of gambling losses and punitive damages that could potentially total billions of dollars.
Filed in California’s Northern District Court, which has jurisdiction over the financial services conglomerate based in Silicon Valley’s Menlo Park, Mazza says he and thousands of others were harmed by Robinhood and its sports prediction market partner, Kalshi, by duping them into gambling on sports while being told such trading constituted financial investing.
Complaint: Sports Trading Unlike Commodity Investing
Prediction markets have been around for decades, allowing traders to speculate on the price of various commodities and outcomes of future events. Prediction markets offering trading on events tied to sports only began last year.
Critics say sports trading on prediction markets is no different than sports betting. But unlike legal sportsbooks, which have paid many millions of dollars in licensing fees and are regulated and heavily taxed, prediction markets are not subjected to state laws, regulations, or taxation.
Mazza argues he was misled by Robinhood on claims that the prediction market didn’t properly market or warn about the possible financial dangers of trading on sports.
Defendants’ marketing and user-interface design do not adequately communicate the practical reality that customers, including Plaintiff and the Class, may be using their Robinhood securities portfolios as collateral to engage in highly speculative event-contract trading for which there is no corollary underlying collateral (like an investment in gold) or ownership interest (like stock in a company) and that can rapidly erode equity in the user’s financial securities account,” the complaint alleges.
“Robinhood’s educational materials do a poor job, if any, describing risks such as margin calls, forced liquidation, and losses exceeding deposits, and those disclosures (if any) are often embedded within lengthy legal agreements, help-center articles, or generalized risk statements rather than presented in a prominent, transaction-specific manner at the point of trade execution,” the complaint continues. “Thus, Robinhood insufficiently warns consumers that speculative trading against margin may expose core investment holdings and long-term stock portfolios to substantial and accelerated losses and even significant debt.”
In simpler terms: while it’s unlikely that $1,000 in gold will be worth $0 tomorrow, a $1,000 bet on tonight’s Los Angeles Dodgers becomes worthless should the Tampa Bay Rays win. Mazza claims he has lost approximately $400,000, including fees and commission, wagering on Robinhood sports events.
“As a direct and proximate result of Defendants’ conduct, Plaintiff and members of the Class and/or State Subclasses suffered substantial monetary losses through speculative contracts and wagering transactions that would not have occurred absent Defendants’ unlawful operation and inducement of gambling activity,” the litigation alleges.
The complaint claims Robinhood is running an illegal sports wagering enterprise in violation of Georgia’s ban on sports betting, the Georgia Fair Business Practices Act, and California’s Unfair Competition Law
Robinhood Response
Mazza’s complaint against Robinhood was filed on June 10. The company has not yet responded to the litigation.
Robinhood will presumably argue for the case to be dismissed on claims that federal preemption trumps state laws. Robinhood’s trading exchanges are regulated by the Commodity Futures Trading Commission, an independent agency of the federal government.
Robinhood could also argue that the plaintiff voluntarily participated in its sports contracts and knowingly facilitated the trades that led to his losses.
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