X0303 4 2011-06-03 0001068796 MAXYGEN INC MAXY 0001101713 RINGOLD GORDON C/O MAXYGEN, INC. 515 GALVESTON DRIVE REDWOOD CITY CA 94063 1 0 0 0 Common Stock 2011-06-03 4 P 0 10000 5.22 A 60000 D Common Stock 2011-06-06 4 P 0 10000 5.27 A 70000 D Common Stock 256496 I Trust Common Stock 63198 I By Technogen The purchase price reported in column 4 of Table I represents the weighted average purchase price of the shares purchased ranging from $5.21 to $5.24 per share. Upon request by the Commission staff, the issuer, or a security holder of the issuer, the reporting person will provide full information regarding the number of shares purchased at each separate price within the range set forth in this footnote (1). The purchase price reported in column 4 of Table I represents the weighted average purchase price of the shares purchased ranging from $5.25 to $5.28 per share. Upon request by the Commission staff, the issuer, or a security holder of the issuer, the reporting person will provide full information regarding the number of shares purchased at each separate price within the range set forth in this footnote (2). Gordon Ringold and Tanya Zarucki 1999 Trust The amount of securities reported consists of shares of common stock of the Company held by Technogen Enterprises, L.L.C. Dr. Ringold is a Managing Member of Technogen Enterprises, L.L.C. and has shared power to vote or direct the vote of and shared power to dispose or direct the disposition of the shares held by the limited liability company. Dr. Ringold disclaims beneficial ownership of these shares except to the extent of his pecuniary interest in the limited liability company. /s/ John Borkholder - Attorney-in-fact 2011-06-07