INVESTOR ALERT: Class Action Lawsuit Filed on Behalf of Altimmune, Inc. (ALT) Investors – Holzer & Holzer, LLC Encourages Investors With Significant Losses to Contact the Firm

Core Viewpoint - A shareholder class action lawsuit has been filed against Altimmune, Inc. alleging that the company made materially false and misleading statements regarding the results of the IMPACT Phase 2b MASH trial, particularly concerning inflated expectations and undisclosed adverse information related to the placebo group's responses [1] Group 1: Lawsuit Details - The lawsuit claims that Altimmune consistently promoted inflated expectations for positive topline results from the IMPACT Phase 2b MASH trial [1] - It is alleged that the company concealed higher responses in the placebo group, which could negatively impact the topline results [1] Group 2: Shareholder Information - Shareholders who purchased Altimmune shares between August 10, 2023, and June 25, 2025, and experienced significant losses are encouraged to discuss their legal rights [2] - The deadline for shareholders to request to be appointed as lead plaintiff in the case is October 6, 2025 [3] Group 3: Legal Representation - Holzer & Holzer, LLC is a law firm specializing in securities litigation and has a history of recovering significant amounts for shareholders affected by corporate misconduct [3] - The firm has been recognized as an ISS top-rated securities litigation law firm for 2021, 2022, and 2023 [3]