X0306 4 2021-09-15 0 0001656536 Decibel Therapeutics, Inc. DBTX 0001492749 Reid Laurence C/O DECIBEL THERAPEUTICS, INC. 1325 BOYLSTON STREET, SUITE 500 BOSTON MA 02215 1 1 0 0 President and Chief Executive Common Stock 2021-09-15 4 P 0 10000 7.64 A 25849 D The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $7.587 to $7.65, inclusive. The reporting person undertakes to provide to the staff of the Securities and Exchange Commission, the issuer or any security holder of the issuer, upon request, full information regarding the number of shares purchased at each separate price. /s/ Laurence Reid 2021-09-17