X0306 4 2020-09-24 0 0001326190 Altimmune, Inc. ALT 0001743611 Pisano Wayne C/O ALTIMMUNE, INC. 910 CLOPPER ROAD, SUITE 201S GAITHERSBURG MD 20878 1 0 0 0 Stock Options (option to buy) 12.03 2020-09-24 4 A 0 25500 0.00 A 2030-09-24 Common Stock, par value $0.0001 25500 25500 D The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following September 24, 2020, subject to the reporting person's continued service through the applicable vesting date. Exhibit 24 - Power of Attorney /s/ William Brown, as Attorney-in-Fact 2020-09-28