X0202 4 2008-05-23 0 0000350907 THORATEC CORP THOR 0001217439 FINNEY ELISHA W 6035 STONERIDGE DRIVE PLEASANTON CA 94588 1 0 0 0 Common Stock 2008-05-23 4 A 0 5000 0 A 12000 D Common Stock 1000 I By Separate Property Trust 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. Elisha Finney as Trustee of the Robert D. Finney and Elisha W. Finney 2000 Revocable Trust. /s/David A. Lehman, Attorney-In-Fact 2008-05-27