NEW YORK, Dec. 25, 2025 (GLOBE NEWSWIRE) -- Bronstein, Gewirtz & Grossman, LLC, a nationally recognized investor-rights law firm, announces that a class action lawsuit has been filed against Canadian Imperial Bank of Commerce (“CIBC”) and Royal Bank of Canada (“RBC”), and their broker-dealer subsidiaries (together, the “Defendants”). The action alleges that Defendants defrauded investors by placing and executing manipulative trades designed to artificially deflate the price of Quantum Biopharma Ltd. (“Quant ...