The justices heard arguments in Nvidia's appeal of a lower court's decision allowing a 2018 class action-litigation led by the Stockholm, Sweden-based investment management firm E. Ohman J: or Fonder AB - to proceed. It is one of two cases heard by the Supreme Court this month that could lead to rulings making it harder for private litigants to hold companies to account for alleged securities fraud. The other one, involving Meta's Facebook, was argued on Nov. 6.