X0306 4 2017-12-01 0 0001435049 ADURO BIOTECH, INC. ADRO 0001465994 Lew Jennifer C/O ADURO BIOTECH, INC. 740 HEINZ AVENUE BERKELEY CA 94710 0 1 0 0 Sr. Vice President of Finance Common Stock 2017-12-01 4 M 0 6600 0.82 A 68938 D Common Stock 2017-12-01 4 S 0 6600 9.4595 D 62338 D Stock Option (Right to Buy) 0.82 2017-12-01 4 M 0 6600 0.00 D 2023-11-26 Common Stock 6600 50709 D The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 26, 2017. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.25 to $9.525, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range. The shares subject to the Option are fully vested and immediately exercisable. /s/ Jennifer Lew 2017-12-04