X0306 4 2015-04-20 0 0001435049 ADURO BIOTECH, INC. ADRO 0001635127 Rogers John E. and Lois A. C/O ADURO BIOTECH, INC. 626 BANCROFT WAY, 3C BERKELEY CA 94710 0 0 1 0 Common Stock 2015-04-20 4 C 0 14400 A 28308 D Common Stock 2015-04-20 4 C 0 543988 A 572296 D Common Stock 2015-04-20 4 C 0 2193460 A 2765756 D Common Stock 2015-04-20 4 C 0 2847774 A 5613530 D Common Stock 2015-04-20 4 C 0 231171 A 5844701 D Common Stock 2015-04-20 4 P 0 147058 17.00 A 5991759 D Common Stock 2015-04-20 4 C 0 37898 A 37898 I By Buchholz Rogers Family Living Trust 2012 Common Stock 2015-04-20 4 C 0 14400 A 52298 I By Buchholz Rogers Family Living Trust 2012 Common Stock 2015-04-20 4 C 0 18949 A 18949 I By Christopher Hagerman Common Stock 2015-04-20 4 C 0 7200 A 26149 I By Christopher Hagerman Common Stock 2015-04-20 4 C 0 37898 A 37898 I By Phan Rogers Trust Common Stock 2015-04-20 4 C 0 14400 A 52298 I By Phan Rogers Trust Common Stock 2015-04-20 4 C 0 18949 A 18949 I By Joseph Rogers Common Stock 2015-04-20 4 C 0 7200 A 26149 I By Joseph Rogers Series A Preferred Stock 2015-04-20 4 C 0 14400 0.00 D Common Stock 14400 0 D Series A-1 Preferred Stock 2015-04-20 4 C 0 543988 0.00 D Common Stock 543988 0 D Series B Preferred Stock 2015-04-20 4 C 0 2193460 0.00 D Common Stock 2193460 0 D Series C Preferred Stock 2015-04-20 4 C 0 2847774 0.00 D Common Stock 2847774 0 D Series D Preferred Stock 2015-04-20 4 C 0 231171 0.00 D Common Stock 231171 0 D Series B Preferred Stock Warrant (right to buy) 1.1937 2015-04-20 4 D 0 11815 0.00 D 2011-04-15 2016-04-15 Series B Preferred Stock 8506 0 D Common Stock Warrant (right to buy) 1.66 2015-04-20 4 A 0 8506 0.00 A 2011-04-15 2016-04-15 Common Stock 8506 8506 D Series C Preferred Stock 2015-04-20 4 C 0 37898 0.00 D Common Stock 37898 0 I By Buchholz Rogers Family Living Trust 2012 Series D Preferred Stock 2015-04-20 4 C 0 14400 0.00 D Common Stock 14400 0 I By Buchholz Rogers Family Living Trust 2012 Series C Preferred Stock 2015-04-20 4 C 0 18949 0.00 D Common Stock 18949 0 I By Christopher Hagerman Series D Preferred Stock 2015-04-20 4 C 0 7200 0.00 D Common Stock 7200 0 I By Christopher Hagerman Series C Preferred Stock 2015-04-20 4 C 0 37898 0.00 D Common Stock 37898 0 I By Phan Rogers Trust Series D Preferred Stock 2015-04-20 4 C 0 14400 0.00 D Common Stock 14400 0 I By Phan Rogers Trust Series C Preferred Stock 2015-04-20 4 C 0 18949 0.00 D Common Stock 18949 0 I By Joseph Rogers Series D Preferred Stock 2015-04-20 4 C 0 7200 0.00 D Common Stock 7200 0 I By Joseph Rogers Each share of Series A Preferred Stock, Series A-1 Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, and Series D Preferred Stock automatically converted into 0.72 of a share of common stock immediately prior to the closing of the Issuer's initial public offering, and has no expiration date. The securities are held by Buchholz Rogers Family Living Trust 2012, over which John E. Rogers exercises voting control. The securities are held by Christopher Hagerman, over which John E. Rogers exercises voting control. The securities are held by Phan Rogers Trust, over which John E. Rogers exercises voting control. The securities are held by Joseph Rogers, over which John E. Rogers exercises voting control. Pursuant to the terms of the Series B Preferred Stock Warrant (the "Old Warrant"), effective upon conversion of all outstanding shares of Series B Preferred Stock of the Issuer, the Old Warrant converts into a Warrant to purchase shares of Common Stock of the Issuer (the "New Warrant"). The two transactions reported in Table II above show the cancellation of the Old Warrant and acquisition of the New Warrant in connection with the automatic conversion of the Series B Preferred Stock into 0.72 of a share of common stock immediately prior to the closing of the Issuer's initial public offering. This is the first of two Forms 4 filed by the reporting person on the same date, April 22, 2015. /s/ Jennifer Lew, Attorney-in-Fact 2015-04-22