X0306 4 2015-05-15 0 0000350907 THORATEC CORP THOR 0001641341 Antonucci Marta 6035 STONERIDGE DRIVE PLEASANTON CA 94588 0 1 0 0 President, International Common Stock 2015-05-15 4 A 0 13080 0 A 13080 D Non-Qualified Stock Options (right to buy) 44.75 2015-05-15 4 A 0 37314 0 A 2016-05-15 2025-05-15 Common Stock 37314 37314 D Represents restricted stock units. Each restricted stock unit represents a right to receive one share of Thoratec Corporation common stock upon vesting. The restricted stock units vest in four equal annual installments commencing one year after the grant date. Initial equity grant according to the Company's Amended and Restated 2006 Incentive Stock Plan. The authorized equity grant will be processed according to the Company's monthly grant process and will take place on the first available grant date immediately following the equity grant approval. Restricted stock units and options were granted pursuant to the Company's Amended and Restated 2006 Incentive Stock Plan with no payment received for the restricted stock units and options. Options vest in four equal annual installments commencing one year after the grant date. /s/David A. Lehman, Attorney-In-Fact 2015-05-15