Banks Must Defend Libor Lawsuits After Judges Warn of Impact

Sixteen of the world’s largest banks including JPMorgan Chase & Co. and Citigroup Inc. must face antitrust lawsuits accusing them of hurting investors who bought securities tied to Libor by rigging an interest-rate benchmark, a ruling that an appeals court warned could devastate them.

The appellate judges reversed a lower-court ruling on one issue -- whether the investors had adequately claimed in their complaints to have been harmed -- while sending the cases back for the judge to consider another issue: whether the plaintiffs are the proper parties to sue, in part because their claims, if successful, provide for triple damages that could overwhelm the banks.