X0201 5 2003-12-31 0 0 0001068796 MAXYGEN INC MAXY 0001101713 RINGOLD GORDON C/O MAXYGEN, INC. 515 GALVESTON DRIVE REDWOOD CITY CA 94063 1 0 0 0 Common Stock 2003-12-05 5 G 0 12500 D 474231 I Trust Common Stock 1396531 I Technogen Common Stock 865 D The disposition was a gift with no disposition price. Gordon Ringold and Tanya Zarucki 1999 Trust. Consists of 1,333,333 shares of Maxygen common stock held by Technogen Associates, L.P. and 63,198 shares held by Technogen Enterprises, L.L.C. Technogen Managers, L.L.C. is the general partner of Technogen Associates , L.P. Dr. Ringold is a Managing Member of Technogen Enterprises, L.L.C. and Technogen Managers, L.L.C. and disclaims beneficial ownership of these shares except to the extent of his pecuniary interest in the limited liability companies. Gordon Ringold 2004-02-11