A U.S. federal court on Thursday dismissed a lawsuit accusing Robinhood Markets Inc. of violating state laws by restricting trades on so-called meme stocks during a January 2021 rally, a move that retail traders allege resulted in billions in losses. Chief Judge Cecilia Altonaga of the federal court in Miami ruled that retail investors cannot pursue negligence and breach of fiduciary duty claims against the commission-free brokerage, citing Robinhood’s customer agreement which allowed it to restrict trading. Natalia Salas, an attorney for the plaintiffs, said they plan to appeal the decision on behalf of investors who were not bound by the Robinhood customer agreement. The lawsuit was part of the wave of litigation after the brokerage temporarily barred customers from buying certain hot stocks, including GameStop Corp. and AMC Entertainment Holdings Inc., as their value soared during the social-media fueled rally. The investors alleged that Robinhood had courted customers with …