 NEW YORK, Jan. 20, 2023 PRNewswire WHY: Rosen Law Firm, a global investor rights law firm, announces the filing of a class action lawsuit on behalf of purchasers of the securities of Y-mAbs Therapeutics, Inc. NASDAQ: YMAB between October 6, 2020 and October 28, 2022, both dates inclusive the Class Period. A class action ...... 