Altimmune, Inc. (ALT:NASDAQ) closed at $2.04 on October 27, 2026, down 0.49% on the day. The stock trades 68.3% below its 52-week high of $6.44 and 1.5% above its 52-week low of $2.01. Over the past year, it lost 50.5%. Altimmune, Inc. is part of the Health Care sector (Major Pharmaceuticals).
In 252 trading sessions since October 27, 2025, ALT closed higher on 103 days (41%). Its best day was January 5, 2026 (+16.52%) and its worst was December 19, 2025 (-22.77%). The stock moved 10% or more in a single session 7 times. It opened at least 5% above the previous day's high 1 time.
PharmAthene, Inc., a biodefense company, develops and commercializes medical countermeasures against biological and chemical threats in the United States. The company focuses on developing lyophilized anthrax vaccine based on its proprietary technology platform. It serves National Institute of Allergy and Infectious Diseases, and the Biomedical Advanced Research and Development Authority. PharmAthene, Inc. is headquartered in Annapolis, Maryland.
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Based on end-of-day data. For information only, not investment advice.