X0202 4 2008-05-23 0 0000350907 THORATEC CORP THOR 0001218705 MULVENA DANIEL M 6035 STONERIDGE DRIVE PLEASANTON CA 94588 1 0 0 0 Common Stock 2008-05-23 4 A 0 5000 0.00 A 13750 D Restricted Stock was granted on May 23, 2008. The vesting commencement for the Restricted Stock is retroactive to May 20, 2008. The Restricted Stock vests in four equal annual installments commencing one year after that date. Restricted stock was granted pursuant to the Company?s 2006 Incentive Stock Plan with no payment received for the restricted stock. /s/ David Lehman, Attorney-In-Fact 2008-05-27