Core Viewpoint - A class action lawsuit has been filed against Altimmune, Inc. on behalf of shareholders who purchased securities between August 10, 2023, and June 25, 2025, alleging that the company misrepresented the results of its IMPACT Phase 2b MASH trial [1][4]. Group 1: Lawsuit Details - The lawsuit claims that Altimmune created a false impression regarding the reliability of information related to the IMPACT Phase 2b MASH trial results, specifically failing to meet a key statistical significance marker for fibrosis reduction [4]. - Altimmune allegedly inflated expectations for positive results while concealing adverse data from the placebo group, which negatively impacted the topline results [4]. - When the true results were disclosed, investors reportedly suffered damages due to the misleading information provided by Altimmune [4]. Group 2: Participation Information - Shareholders who purchased Altimmune securities may be entitled to compensation without any out-of-pocket fees through a contingency fee arrangement [2]. - Interested parties can join the class action by visiting the provided link or contacting the law firm for more information [3][5]. - A lead plaintiff must file a motion with the court by October 6, 2025, to represent other class members in the litigation [1][3].