X0407 4 2023-06-06 0 0001786255 Icosavax, Inc. ICVX 0001813798 Wassil Jim C/O ICOSAVAX, INC. 1930 BOREN AVE., SUITE 1000 SEATTLE WA 98101 1 0 0 0 0 Stock Option (Right to Buy) 9.89 2023-06-06 4 A 0 17000 0.00 A 2033-06-05 Common Stock 17000 17000 D 1/12th of the total number of shares of common stock subject to the option vest monthly following June 6, 2023, the vesting commencement date, provided if the next occurring annual meeting of the Issuer's stockholders occurs prior to the full vesting of the option, any remaining options will vest on the date of such annual meeting, subject to the Reporting Person's continuous service on the board of directors of the Issuer through such vesting date. /s/ Elizabeth Bekiroglu, Attorney-in-Fact for Jim Wassil 2023-06-08