Altimmune to Participate in the Piper Sandler 37th Annual Healthcare Conference

Altimmune, Inc. (Nasdaq: ALT), a late clinical-stage biopharmaceutical company developing novel peptide-based therapeutics for liver and cardiometabolic diseases, today announced that members of the Company’s management team will participate in a fireside chat at the Piper Sandler 37 th Annual Healthcare Conference. Details are as follows:

Conference: Piper Sandler 37 th Annual Healthcare Conference Date/Time: Wednesday, December 3, 2025 at 2:30 p.m. ET

The session will be webcast and can be accessed by visiting the Events section of the Altimmune website.

About Altimmune

Altimmune is a late clinical-stage biopharmaceutical company developing novel peptide-based therapeutics for liver and cardiometabolic diseases. The Company’s lead product candidate is pemvidutide, a glucagon/GLP-1 dual receptor agonist for the treatment of metabolic dysfunction-associated steatohepatitis (MASH), alcohol use disorder (AUD) and alcohol-associated liver disease (ALD). For more information, please visit www.altimmune.com .

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Investor Contact: Lee Roth Burns McClellan Phone: 646-382-3403 [email protected]

Media Contact: Savannah Valade Real Chemistry altimmune@realchemistry.com

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