X0202 4 2004-08-02 0001068796 MAXYGEN INC MAXY 0001101713 RINGOLD GORDON C/O MAXYGEN, INC. 515 GALVESTON DRIVE REDWOOD CITY CA 94063 1 0 0 0 Common Stock 2004-08-02 4 S 0 100 9.57 D 440896 I Trust Common Stock 2004-08-02 4 S 0 100 9.55 D 440796 I Trust Common Stock 2004-08-02 4 S 0 500 9.54 D 440296 I Trust Common Stock 2004-08-02 4 S 0 200 9.53 D 440096 I Trust Common Stock 2004-08-02 4 S 0 100 9.52 D 439996 I Trust Common Stock 2004-08-02 4 S 0 700 9.51 D 439296 I Trust Common Stock 2004-08-02 4 S 0 200 9.50 D 439096 I Trust Common Stock 2004-08-02 4 S 0 100 9.49 D 438996 I Trust Common Stock 2004-08-02 4 S 0 400 9.48 D 438596 I Trust Common Stock 2004-08-02 4 S 0 200 9.47 D 438396 I Trust Common Stock 2004-08-02 4 S 0 200 9.46 D 438196 I Trust Common Stock 2004-08-02 4 S 0 400 9.45 D 437796 I Trust Common Stock 2004-08-02 4 S 0 200 9.44 D 437596 I Trust Common Stock 2004-08-02 4 S 0 100 9.43 D 437496 I Trust Common Stock 2004-08-02 4 S 0 100 9.42 D 437396 I Trust Common Stock 2004-08-02 4 S 0 200 9.40 D 437196 I Trust Common Stock 2004-08-02 4 S 0 200 9.39 D 436996 I Trust The sales reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 25, 2004. Since the reporting person's last report 865 shares previously held directly have been transferred to the Gordon Ringold and Tanya Zarucki 1999 Trust of which the reporting person is a trustee. Gordon Ringold and Tanya Zarucki 1999 Trust Paul Quinlan - Attorney-in-fact 2004-08-02