X0306 4 2021-08-02 1 0001786255 Icosavax, Inc. ICVX 0001765710 Qiming U.S. Healthcare Fund II, L.P. 11100 NE 8TH ST. SUITE 200 BELLEVUE WA 98004 0 0 0 1 Former 10% Owner 0001868862 Qiming U.S. Healthcare GP II, LLC 11100 NE 8TH ST SUITE 200 BELLEVUE WA 98004 0 0 0 1 Former 10% Owner 0001242126 MCDADE MARK 11100 NE 8TH ST SUITE 200 BELLEVUE WA 98004 0 0 0 1 Former 10% Owner Common Stock 2021-08-02 4 C 0 3310228 0.00 A 3310228 D Common Stock 2021-08-02 4 P 0 200000 15.00 A 3510228 D Common Stock 2021-08-02 4 P 0 8018 15.00 A 3518246 D Common Stock 2021-08-02 4 P 0 13333 15.00 A 3523561 D Series A-1 Preferred Stock 0.00 2021-08-02 4 C 0 12480498 D Common Stock 3003224 0 D Series B-1 Preferred Stock 0.00 2021-08-02 4 C 0 1275817 D Common Stock 307004 0 D On August 2, 2021, the shares of Series A-1 Preferred Stock and Series B-1 Preferred Stock converted into shares of the Issuer's common stock at a ratio of 4.1557-for-1 automatically upon the closing of the Issuer's initial public offering without payment or further consideration. The shares have no expiration date. As a result of the Issuer's initial public offering, Qiming U.S. Healthcare Fund II, L.P. ("Qiming") is no longer a 10% owner of the Issuer and is therefore no longer subject to Section 16 in connection with its transactions in the equity securities of the Issuer. The securities are directly held by Qiming. Qiming U.S. Healthcare GP II, LLC ("Qiming GP") is the General Partner of Qiming. Gary Rieschel and Mark McDade are the managing members of Qiming GP. As a result, each of Qiming GP and Messrs. Rieschel and McDade may be deemed to beneficially own the shares held by Qiming. Shares reported herein as purchased on August 2, 2021 represent 8,018 shares of Common Stock purchased by Mark McDade. Shares reported herein as purchased on August 2, 2021 represent 13,333 shares of Common Stock purchased by Gary Rieschel. Shares reported herein as purchased on August 2, 2021 represent 200,000 shares of Common Stock purchased by Qiming. /s/ Qiming U.S. Healthcare Fund II, L.P., by Qiming U.S. Healthcare GP II, LLC, its General Partner 2021-08-02 /s/ Mark McDade 2021-08-02