X0306 4 2022-04-01 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 2022-04-01 4 P 0 42225 7.10 A 50243 D Common Stock 3510228 I Qiming U.S. Healthcare Fund II, L.P. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $6.70 to $7.45 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote. 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. /s/ Mark McDade 2022-04-05