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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
350907	Thoratec Corp	THOR	Electromedical & Electrotherapeutic Apparatus (3845)	942340464

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1218700	Lawrence Cohen	6035 Stoneridge Drive Pleasanton CA 94588	Division President	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2010-05-11	20,613	$13.97	52,942	No	4	M	Direct
Common Stock	Acquisiton	2010-05-11	10,500	$14.97	63,442	No	4	M	Direct
Common Stock	Acquisiton	2010-05-11	500	$16.03	63,942	No	4	M	Direct
Common Stock	Disposition	2010-05-11	31,613	$41.00	32,329	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	M	Direct
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Non-Qualified Stock Option (right to buy)	Disposition	2010-05-11	20,613	$0.00	20,613	$13.97
Common Stock	Non-Qualified Stock Option (right to buy)	Disposition	2010-05-11	10,500	$0.00	10,500	$14.97
Common Stock	Non-Qualified Stock Option (right to buy)	Disposition	2010-05-11	500	$0.00	500	$16.03

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2004-06-05	2013-06-05	No	4	M	Direct
10,500	2009-02-27	2018-02-27	No	4	M	Direct
0	2006-05-15	2016-05-15	No	4	M	Direct

Footnotes

Options and restricted stock units were granted pursuant to the Company's equity incentive plan with no payments received for either.
Shares vest in four equal installments commencing one year after the grant date.
Shares vest 100% at time of grant.
This transaction was executed in multiple trades in prices ranging from $40.75 to $41.22. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the Issuer, or a stockholder of the Issuer, information regarding the number of shares and prices at which the transaction was effected.