X0206 3 2021-09-21 0 0001786255 Icosavax, Inc. ICVX 0001884087 Bekiroglu Elizabeth C/O ICOSAVAX, INC. 1616 EASTLAKE AVENUE E., SUITE 208 SEATTLE WA 98102 0 1 0 0 See Remarks Common Stock 27750 D Stock Option (Right to Buy) 39.60 2031-09-06 Common Stock 222250 D Represents restricted stock units ("RSUs") granted on September 7, 2021, 25% of the total number of RSUs granted vest on each of the first four anniversaries of September 7, 2021, the vesting commencement date, subject to the reporting person's continued service on the applicable vesting date. Vesting of the RSUs shall accelerate as provided in the reporting person's offer letter. Each RSU represents a contingent right to receive one share of common stock of the Issuer. 25% of the shares subject to the option will vest on 9/7/2022, and 1/48th of the shares subject to the option vest monthly thereafter. General Counsel and Corporate Secretary Exhibit List: Exhibit 24 - Power of Attorney /s/ Elizabeth Bekiroglu 2021-09-21