NEW YORK, May 15, 2024 /PRNewswire/ -- WHY: Rosen Law Firm, a global investor rights law firm, reminds purchasers of securities of Altimmune, Inc. (NASDAQ: ALT) between December 1, 2023 and April 26, 2024, both dates inclusive (the "Class Period"), of the important July 5, 2024 lead plaintiff deadline.SO WHAT: If you purchased Altimmune securities during the Class Period you may be entitled to compensation without payment of any out of pocket fees or costs through a contingency fee arrangement.WHAT TO DO NE ...