X0201 4 2004-04-01 0001068796 MAXYGEN INC MAXY 0001101713 RINGOLD GORDON C/O MAXYGEN, INC. 515 GALVESTON DRIVE REDWOOD CITY CA 94063 1 0 0 0 Common Stock 2004-04-01 4 S 0 24 9.67 D 474207 I Trust Common Stock 2004-04-01 4 S 0 354 9.66 D 473853 I Trust Common Stock 2004-04-01 4 S 0 276 9.65 D 473577 I Trust Common Stock 2004-04-01 4 S 0 800 9.64 D 472777 I Trust Common Stock 2004-04-01 4 S 0 100 9.63 D 472677 I Trust Common Stock 2004-04-01 4 S 0 99 9.61 D 472578 I Trust Common Stock 2004-04-01 4 S 0 100 9.59 D 472478 I Trust Common Stock 2004-04-01 4 S 0 100 9.58 D 472378 I Trust Common Stock 2004-04-01 4 S 0 200 9.54 D 472178 I Trust Common Stock 2004-04-01 4 S 0 42 9.52 D 472136 I Trust Common Stock 2004-04-01 4 S 0 200 9.51 D 471936 I Trust Common Stock 2004-04-01 4 S 0 100 9.50 D 471836 I Trust Common Stock 2004-04-01 4 S 0 100 9.49 D 471736 I Trust Common Stock 2004-04-01 4 S 0 100 9.48 D 471636 I Trust Common Stock 2004-04-01 4 S 0 200 9.47 D 471436 I Trust Common Stock 2004-04-01 4 S 0 100 9.45 D 471336 I Trust Common Stock 2004-04-01 4 S 0 200 9.44 D 471136 I Trust Common Stock 2004-04-01 4 S 0 405 9.42 D 470731 I Trust Common Stock 2004-04-01 4 S 0 200 9.32 D 470531 I Trust Common Stock 2004-04-01 4 S 0 300 9.30 D 470231 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 2004-04-02