X0306 4 2022-02-10 0 0001786255 Icosavax, Inc. ICVX 0001874371 Holtzman Douglas C/O ICOSAVAX, INC. 1616 EASTLAKE AVENUE E., SUITE 208 SEATTLE WA 98102-3793 0 1 0 0 Chief Scientific Officer Common Stock 2022-02-10 4 A 0 19485 0.00 A 303633 D Common Stock 2021-12-31 4 G 0 10000 0.00 D 42440 I By Stanley Holtzman Stock Option (Right to Buy) 17.55 2022-02-10 4 A 0 81950 0.00 A 2032-02-09 Common Stock 81950 81950 D Represents restricted stock units ("RSUs") which will vest as to 25% of the total number of RSUs granted on each of the first four anniversaries of February 10, 2022, subject to the reporting persons continued service through the applicable vesting date. Each RSU represents a contingent right to receive one share of common stock of the Issuer and the RSUs have no expiration date. Includes 1,666 shares acquired under the Issuer's employee stock purchase plan on November 30, 2021. Douglas Holtzman, Ph.D. holds power-of-attorney (POA) over the shares owned by Stanley Holtzman. As POA, Dr. Holtzman holds voting and dispositive control over such shares. Dr. Holtzman disclaims beneficial ownership of the shares over which he has POA except to the extent of any pecuniary interest therein. 25% of the shares subject to the option will vest on February 10, 2023, and 1/48th of the shares subject to the option vest monthly thereafter, subject to the reporting person's continued service through the applicable vesting date. Exhibit 24 Power of Attorney /s/ Elizabeth Bekiroglu, Attorney-in-Fact for Douglas Holtzman 2022-02-14