X0206 3 2020-06-25 0 0001722271 Akouos, Inc. AKUS 0001816128 Partners Innovation Fund, LLC 215 FIRST STREET, SUITE 500 CAMBRIDGE MA 02142 0 0 1 0 Series Seed Preferred Stock Common Stock 102751 D Series A Preferred Stock Common Stock 342505 D Series B Preferred Stock Common Stock 119997 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, LLC ("PIF"). PIF is a limited liability company controlled by its members. The Members of PIF are (1) The General Hospital Corporation (commonly referred to as "MGH"), (2) Brigham and Women's Hospital and (3) Massachusetts Eye and Ear. 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, LLC By: Julius Knowles, Authorized Signatory 2020-06-25