0001326190 2026-05-13 2026-05-13 0001326190 false 8-K 2026-05-13 ALTIMMUNE, INC. DE 001-32587 20-2726770 910 Clopper Road Suite 201S Gaithersburg MD 20878 240 654-1450 false false false false Common stock, par value $0.0001 per share ALT NASDAQ false