X0206 3 2021-07-28 0 0001786255 Icosavax, Inc. ICVX 0001014330 FIELDS HEIDI C/O ICOSAVAX, INC. 1616 EASTLAKE AVENUE E., SUITE 208 SEATTLE WA 98102 1 0 0 0 Stock Option (Right to Buy) 7.44 2031-05-28 Common Stock 25266 D 1/36th of the shares subject to the option vest monthly following May 29, 2021, the vesting commencement date. Exhibit List: Exhibit 24 - Power of Attorney /s/ Thomas Russo, Attorney-in Fact 2021-07-28