The Schall Law Firm, a national shareholder rights litigation firm, announces that it is investigating claims on behalf of investors of Altimmune, Inc. (“Altimmune” or “the Company”) (NASDAQ: ALT) for violations of the securities laws.

The investigation focuses on whether the Company issued false and/or misleading statements and/or failed to disclose information pertinent to investors. Altimmune announced "topline results from the IMPACT Phase 2b trial of pemvidutide in metabolic dysfunction-associated steatohepatitis (MASH)," on June 26, 2025. Although the Company characterized the results as “positive,” it added that “the effects on fibrosis improvement without worsening of MASH in an ITT analysis were 31.8% and 34.5% for pemvidutide 1.2 mg and 1.8 mg, respectively compared with 25.9% for placebo (differences not statistically significant)." Based on this news, shares of Altimmune fell by 52.18% on the same day.

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We also encourage you to contact Brian Schall of the Schall Law Firm, 2049 Century Park East, Suite 2460, Los Angeles, CA 90067, at 310-301-3335, to discuss your rights free of charge. You can also reach us through the firm's website at www.schallfirm.com, or by email at bschall@schallfirm.com.

The Schall Law Firm represents investors around the world and specializes in securities class action lawsuits and shareholder rights litigation.

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