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Class action lawsuits

Altimmune Securities Class Action Lawsuit: Important October 6, 2025 Lead Plaintiff Deadline

Strategic Insights

— 1 min read

The Rosen Law Firm, a global investor rights law firm, reminds investors who purchased securities of Altimmune, Inc. between August 10, 2023, and June 25, 2025, of the October 6, 2025 lead plaintiff deadline. The lawsuit alleges that Altimmune's securities were artificially inflated due to false statements regarding the results of its IMPACT Phase 2b MASH trial.

Key Takeaways:

  • The class action lawsuit was filed against Altimmune, Inc. on behalf of investors who purchased its securities between August 10, 2023, and June 25, 2025.
  • The lawsuit alleges that Altimmune made false statements regarding the results of its IMPACT Phase 2b MASH trial, which led to an artificial inflation of its securities.
  • The Rosen Law Firm, which represents investors throughout the globe, is encouraging investors to select qualified counsel with a track record of success in leadership roles.
  • The firm has recovered hundreds of millions of dollars for investors and has been ranked No. 1 by ISS Securities Class Action Services for number of securities class action settlements in 2017.
  • A lead plaintiff is appointed to represent the class in directing the litigation, and investors have until October 6, 2025, to move the Court to serve as lead plaintiff.
  • The lawsuit claims that investors suffered damages when the true details of Altimmune's IMPACT Phase 2b MASH trial results entered the market.

Statistics:

  • $438 million was secured for investors by the Rosen Law Firm in 2019 alone.
  • The firm has been ranked in the top 4 each year since 2013.
  • The Rosen Law Firm has recovered hundreds of millions of dollars for investors.
  • Over $438 million was secured for investors in 2019.
  • The firm's founding partner, Laurence Rosen, was named by Law360 as a Titan of Plaintiffs' Bar in 2020.

Sources:

  • Rosen Law Firm press release, September 9, 2025
  • LinkedIn: https://www.linkedin.com/company/the-rosen-law-firm
  • Twitter: https://twitter.com/rosen_firm
  • Facebook: https://www.facebook.com/rosenlawfirm
  • Law360, Laurence Rosen named a Titan of Plaintiffs' Bar, 2020

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