X0206 3 2020-10-29 0 0001593899 Atea Pharmaceuticals, Inc. AVIR 0001657434 Hack Andrew A. F. C/O BAIN CAPITAL LIFE SCIENCES INVESTORS, 200 CLARENDON STREET BOSTON MA 02116 1 0 0 0 Series D Convertible Preferred Stock Common Stock 3383190 I See footnotes Series D-1 Convertible Preferred Stock Common Stock 1982469 I See footnotes All series of convertible preferred stock will automatically convert into shares of the Issuer's common stock on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering and have no expiration date. Represents shares held directly by Bain Capital Life Sciences Fund II, L.P. ("BCLS II") and BCIP Life Sciences Associates, LP ("BCIPLS") and, together with BCLS II, the "Bain Capital Life Sciences Entities"). Bain Capital Life Sciences Investors, LLC ("BCLSI") (i) is the ultimate general partner of BCLS II, and (ii) governs the investment strategy and decision-making process with respect to investments held by BCIPLS. Dr. Hack is a Managing Director of BCLSI. By virtue of the relationships described in this footnote, Dr. Hack may be deemed to share voting and dispositive power with respect to the securities held by the Bain Capital Life Sciences Entities. Dr. Hack disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein. /s/ Andrew A.F. Hack 2020-10-29