LOS ANGELES, Sept. 30, 2025 (GLOBE NEWSWIRE) -- The Portnoy Law Firm advises Altimmune, Inc., ("Altimmune" or the "Company") (NASDAQ: ALT) investors of a class action on behalf of investors that bought securities between August 10, 2023, and June 25, 2025, inclusive (the “Class Period”). Altimmune investors have until October 6, 2025 to file a lead plaintiff motion. Investors are encouraged to contact attorney Lesley F. Portnoy, by phone 844-767-8529 or email: lesley@portnoylaw.com, to discuss their legal r ...