X0206 3 2020-06-25 0 0001722271 Akouos, Inc. AKUS 0001689717 Partners Innovation Fund II, L.P. 215 FIRST STREET, SUITE 500 CAMBRIDGE MA 02142 0 0 1 0 Series Seed Preferred Stock Common Stock 68501 D Series A Preferred Stock Common Stock 228336 D Series B Preferred Stock Common Stock 79998 D The Series Seed Preferred Stock is convertible into Common Stock on a 21.073-for-1 basis into the number of shares of Common Stock as shown in Column 3 without payment of further consideration, at any time at the holder's election or upon closing of the initial public offering of the Issuer's common stock. The shares have no expiration date. The securities are held by Partners Innovation Fund II, L.P. ("PIF II"). Partners Innovation Fund II, LLC is the ultimate general partner of PIF II. The Series A Preferred Stock is convertible into Common Stock on a 21.073-for-1 basis into the number of shares of Common Stock as shown in Column 3 without payment of further consideration, at any time at the holder's election or upon closing of the initial public offering of the Issuer's common stock. The shares have no expiration date. The Series B Preferred Stock is convertible into Common Stock on a 21.073-for-1 basis into the number of shares of Common Stock as shown in Column 3 without payment of further consideration, at any time at the holder's election or upon closing of the initial public offering of the Issuer's common stock. The shares have no expiration date. /s/ Partners Innovation Fund II, L.P. By: Julius Knowles, Authorized Signatory 2020-06-25