PHILADELPHIA, Sept. 30, 2025 (GLOBE NEWSWIRE) --  Berger Montague PC is investigating potential securities fraud claims on behalf of investors of Altimmune, Inc. (NASDAQ: ALT) (“Altimmune” or the “Company”) following the filing of a securities class action lawsuit filed on behalf of investors who purchased or otherwise acquired Altimmune securities between August 10, 2023 through June 25, 2025 (the “Class Period”). Investor Deadline: Investors who purchased or acquired Altimmune securities during the Class ...