X0609 4 2026-03-16 0000072444 Vaxart, Inc. VXRT 0001501959 Lo Steven C/O VAXART, INC. 170 HARBOR WAY, SUITE 300 SOUTH SAN FRANCISCO CA 94080 1 1 President, Chief Exec Officer 0 Common Stock 2026-03-16 4 A 0 846500 0 A 2634059 D Common Stock 100000 I By the Lo Family Trust Stock Option (right to buy) 0.6795 2026-03-16 4 A 0 1543000 0 A 2036-03-16 Common Stock 1543000 1543000 D Grant of shares upon vesting of restricted stock units. 25% of the shares underlying the award shall vest on each anniversary of the vesting commencement date of March 16, 2026, so that the restricted stock units would be fully vested on the fourth anniversary of the vesting commencement date. The shares subject to this stock option shall vest as to 25% of the shares underlying the grant on March 16, 2027, the first anniversary of the date that vesting commenced, and thereafter in 36 equal monthly installments such that the stock option shall be fully vested on March 16, 2030. /s/ Edward Berg, Attorney-in-Fact 2026-03-18