X0206 3 2021-07-28 0 0001786255 Icosavax, Inc. ICVX 0001765710 Qiming U.S. Healthcare Fund II, L.P. 11100 NE 8TH ST SUITE 200 BELLEVUE WA 98004 1 0 1 0 0001868862 Qiming U.S. Healthcare GP II, LLC 11100 NE 8TH ST SUITE 200 BELLEVUE WA 98004 0 0 1 0 0001242126 MCDADE MARK 11100 NE 8TH ST SUITE 200 BELLEVUE WA 98004 0 0 1 0 Series A-1 Preferred Stock 0.00 Common Stock 3003224 D Series B-1 Preferred Stock 0.00 Common Stock 307004 D The shares of Series A-1 Preferred Stock and Series B-1 Preferred Stock are convertible, at any time, at the holder's election, to shares of the Issuer's common stock at a ratio of 4.1557-for-1. In addition, effective immediately prior to the closing of the Issuer's initial public offering of its common stock, each share of Series A-1 Preferred Stock and Series B-1 Preferred Stock will automatically convert to shares of the Issuer's common stock at a ratio of 4.1557-for-1. The Series A-1 Preferred Stock and Series B-1 Preferred Stock have no expiration 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 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. Exhibit 24.1 - Power of Attorney Exhibit 24.2 - Power of Attorney Qiming U.S. Healthcare Fund II, L.P., by Qiming U.S. Healthcare GP II, LLC, its General Partner 2021-07-28 Mark McDade 2021-07-28