NEW YORK, April 22, 2023 /PRNewswire/ — WHY: Rosen Law Firm, a global investor rights law firm, reminds purchasers of securities of Amgen Inc. (NASDAQ: AMGN) between July 29, 2020 and April 27, 2022, both dates inclusive (the “Class Period”), of the important May 12, 2023. SO WHAT: If…