X0306 4 2016-01-06 0 0001435049 ADURO BIOTECH, INC. ADRO 0001465994 Lew Jennifer C/O ADURO BIOTECH, INC. 626 BANCROFT WAY, 3C BERKELEY CA 94710 0 1 0 0 Sr. Vice President of Finance Common Stock 2016-01-06 4 M 0 5242 0.82 A 11442 D Common Stock 2016-01-06 4 S 0 4442 25.64 D 7000 D Common Stock 2016-01-06 4 S 0 800 26.09 D 6200 D Stock Option (Right to Buy) 0.82 2016-01-06 4 M 0 5242 0.00 D 2023-11-26 Common Stock 5242 124074 D The sales reported in this Form 4 were affected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 19, 2015. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.02 to $25.99, 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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $26.05 to $26.20, 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. Twenty-five percent of the shares subject to the Option vests on the first anniversary of the vesting commencement date, and the remainder vests in 36 equal monthly installments thereafter for the following three years. /s/ Jennifer Lew 2016-01-06