X0306 4 2022-06-10 0 0001786255 Icosavax, Inc. ICVX 0001242126 MCDADE MARK C/O QIMING U.S. VENTURES MANAGEMENT, LLC 11100 NE 8TH STREET, SUITE 200 BELLEVUE WA 98004 1 0 0 0 Common Stock 2022-06-10 4 A 0 5543 0.00 A 55786 D Common Stock 3510228 I By Qiming U.S. Healthcare Fund II, L.P. Stock Option (Right to Buy) 6.25 2022-06-10 4 A 0 22278 0.00 A 2032-06-09 Common Stock 22278 22278 D These shares represent a restricted stock unit ("RSU") award, which shall vest at the earlier of (x) June 10, 2023 or (y) the date of the 2023 Annual Meeting of Stockholders. The vesting of the RSUs is subject to the Reporting Person's continuous service through such vesting date. The securities are directly held by Qiming U.S. Healthcare Fund II, L.P. ("Qiming"). Qiming U.S. Healthcare GP II, LLC ("Qiming GP") is the sole general partner of Qiming. The Reporting Person is a managing member of Qiming GP and may be deemed to share voting and dispositive power over the shares held by Qiming. The Reporting Person disclaims beneficial ownership of the reported securities, except to the extent of his pecuniary interest therein. This option vests in substantially equal monthly installments over a twelve-month period commencing on July 10, 2022 (or, in the event the 2023 Annual Meeting of Stockholders occurs prior to June 10, 2023, any remaining unvested portion of the option will vest on the date of the 2023 Annual Meeting of Stockholders), subject to the Reporting Person's continuous service as of the applicable vesting date. /s/ Mark McDade 2022-06-14