X0202 4 2006-12-01 0001068796 MAXYGEN INC MAXY 0001101713 RINGOLD GORDON C/O MAXYGEN, INC. 515 GALVESTON DRIVE REDWOOD CITY CA 94063 1 0 0 0 Common Stock 2006-12-01 4 S 0 200 8.80 D 349796 I Trust Common Stock 2006-12-01 4 S 0 297 8.76 D 349499 I Trust Common Stock 2006-12-01 4 S 0 303 8.75 D 349196 I Trust Common Stock 2006-12-01 4 S 0 300 8.73 D 348896 I Trust Common Stock 2006-12-01 4 S 0 200 8.72 D 348696 I Trust Common Stock 2006-12-01 4 S 0 500 8.71 D 348196 I Trust Common Stock 2006-12-01 4 S 0 200 8.70 D 347996 I Trust Common Stock 2006-12-01 4 S 0 300 8.69 D 347696 I Trust Common Stock 2006-12-01 4 S 0 100 8.68 D 347596 I Trust Common Stock 2006-12-01 4 S 0 400 8.66 D 347196 I Trust Common Stock 2006-12-01 4 S 0 400 8.64 D 346796 I Trust Common Stock 2006-12-01 4 S 0 200 8.63 D 346596 I Trust Common Stock 2006-12-01 4 S 0 62 8.61 D 346534 I Trust Common Stock 2006-12-01 4 S 0 200 8.60 D 346334 I Trust Common Stock 2006-12-01 4 S 0 138 8.59 D 346196 I Trust Common Stock 2006-12-01 4 S 0 200 8.57 D 345996 I Trust Common Stock 2006-12-01 4 S 0 800 8.56 D 345196 I Trust Common Stock 2006-12-01 4 S 0 200 8.50 D 344996 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 August 2, 2006. Gordon Ringold and Tanya Zarucki 1999 Trust John Borkholder - Attorney-in-fact 2006-12-04