X0202 4 2004-10-01 0001068796 MAXYGEN INC MAXY 0001101713 RINGOLD GORDON C/O MAXYGEN, INC. 515 GALVESTON DRIVE REDWOOD CITY CA 94063 1 0 0 0 Common Stock 2004-10-01 4 S 0 100 9.87 D 432896 I Trust Common Stock 2004-10-01 4 S 0 64 9.86 D 432832 I Trust Common Stock 2004-10-01 4 S 0 200 9.84 D 432632 I Trust Common Stock 2004-10-01 4 S 0 100 9.83 D 432532 I Trust Common Stock 2004-10-01 4 S 0 100 9.82 D 432432 I Trust Common Stock 2004-10-01 4 S 0 200 9.81 D 432232 I Trust Common Stock 2004-10-01 4 S 0 200 9.79 D 432032 I Trust Common Stock 2004-10-01 4 S 0 300 9.78 D 431732 I Trust Common Stock 2004-10-01 4 S 0 436 9.77 D 431296 I Trust Common Stock 2004-10-01 4 S 0 472 9.76 D 430824 I Trust Common Stock 2004-10-01 4 S 0 400 9.75 D 430424 I Trust Common Stock 2004-10-01 4 S 0 364 9.74 D 430060 I Trust Common Stock 2004-10-01 4 S 0 300 9.73 D 429760 I Trust Common Stock 2004-10-01 4 S 0 164 9.69 D 429596 I Trust Common Stock 2004-10-01 4 S 0 600 9.68 D 428996 I Trust The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 25, 2004. Gordon Ringold and Tanya Zarucki 1999 Trust Paul Quinlan - Attorney-in-fact 2004-10-04