X0202 4 2006-05-12 0 0000350907 THORATEC CORP THOR 0001307313 Burbach Gerhard F 6035 STONERIDGE DRIVE PLEASANTON CA 94588 1 1 0 0 Chief Executive Officer Common Stock 2006-05-12 4 A 0 50000 0 A 50000 D Restricted Stock was granted on May 12, 2006. The vesting commencement for the Restricted Stock is retroactive to January 17, 2006, the Reporting Person's hire date with the Issuer. The Restricted Stock vests entirely on the fifth anniversary of January 17, 2006, subject to potential acceleration. Restricted Stock was granted pursuant to the Company's equity incentive plan with no payment received for the restricted stock. Gerhard F. Burbach 2006-05-16