X0202 4 2005-05-11 0 0000350907 THORATEC CORP THOR 0001218703 HILL J DONALD 6035 STONERIDGE DRIVE PLEASANTON CA 94588 1 0 0 0 Common Stock 2005-05-11 4 M 0 1875 11.625 A 906170 I By Separate Property Trust Common Stock 2005-05-11 4 S 0 1875 13.54 D 904295 I By Separate Property Trust Non-qualified stock option (right-to-buy) 11.625 2005-05-11 4 M 0 1875 0 D 2000-05-12 2005-05-12 Common Stock 1875 0 D J. Donald Hill as Trustee of the J. Donald Hill Separate Property Living Trust U/A/D 7/23/04. This option is 100% vested on the grant date. This option was granted pursuant to the Company's equity incentive plans as a non-qualified option with no payment received for the option. /s/D. Keith Grossman, Attorney-In-Fact 2005-05-11