Altimmune Securities Class Action Lawsuit Filed, Reminds Purchasers of Important Deadline

Strategic Insights -

Investors who purchased securities of Altimmune, Inc. between August 10, 2023, and June 25, 2025, may be entitled to compensation without payment of any out-of-pocket fees or costs through a contingency fee arrangement. A class action lawsuit has already been filed, and the lead plaintiff deadline is October 6, 2025. The Rosen Law Firm, a global investor rights law firm, is reminding investors of the impending deadline.

Key Takeaways:

  • The Altimmune securities class action lawsuit was filed on behalf of investors who purchased securities between August 10, 2023, and June 25, 2025.
  • The lawsuit claims that Altimmune created the false impression that it possessed reliable information pertaining to the results of its IMPACT Phase 2b MASH trial.
  • Altimmune's IMPACT Phase 2b MASH trial results fell short of reality, as shown by the company's topline data, which showed that the statistical significance was not achieved for the fibrosis reduction primary endpoint.
  • Investors suffered damages when the true details entered the market.
  • The lead plaintiff deadline is October 6, 2025.
  • The Rosen Law Firm, a global investor rights law firm, is representing investors throughout the globe, concentrating its practice in securities class actions and shareholder derivative litigation.
  • The firm has achieved significant successes in securities class actions, including the largest ever securities class action settlement against a Chinese company at the time.
  • The firm's attorneys have been recognized by Lawdragon and Super Lawyers.

Statistics:

  • The lawsuit covers a period of over 2 years, from August 10, 2023, to June 25, 2025.
  • The lead plaintiff deadline is October 6, 2025.
  • The Rosen Law Firm has achieved over $438 million for investors in 2019 alone.
  • The firm has been ranked as one of the top 4 securities class action firms in the world since 2013.
  • Laurence Rosen, Esq., the founding partner of the Rosen Law Firm, was named by Law360 as a Titan of Plaintiffs' Bar in 2020.

Sources:

  • Newsfile Corp. - September 13, 2025
  • Rosen Legal - https://rosenlegal.com/submit-form/?case_id=22535
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