FORM 4
[ X ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Lehman David Aaron 		2. Issuer Name and Ticker or Trading Symbol

THORATEC CORP [ THOR ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
SVP and General Counsel
(Last)          (First)          (Middle)

6035 STONERIDGE DRIVE 		3. Date of Earliest Transaction (MM/DD/YYYY)

10/8/2015
(Street)

PLEASANTON, CA 94588
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock   10/1/2015     G    1263   D $0.00   53512   D    
Common Stock   10/8/2015     A    18143   (1) A $0.00   71655   D    
Common Stock   10/8/2015     D    71655   D $63.50   0   D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Non-Qualified Stock Options (Right to Buy)   $14.97   10/8/2015     D         21000      (2) 2/27/2018   Common Stock   21000   $48.53   (2) 0   D    
Non-Qualified Stock Options (Right to Buy)   $23.93   10/8/2015     D         13637      (2) 2/25/2019   Common Stock   13637   $39.57   (2) 0   D    
Non-Qualified Stock Options (Right to Buy)   $29.81   10/8/2015     D         23468      (2) 3/3/2020   Common Stock   23468   $33.69   (2) 0   D    
Non-Qualified Stock Options (Right to Buy)   $27.30   10/8/2015     D         30000      (2) 3/1/2021   Common Stock   30000   $36.20   (2) 0   D    
Non-Qualified Stock Options (Right to Buy)   $33.99   10/8/2015     D         28379      (3) 3/9/2022   Common Stock   28379   $29.51   (3) 0   D    
Non-Qualified Stock Options (Right to Buy)   $35.68   10/8/2015     D         28335      (4) 3/7/2023   Common Stock   28335   $27.82   (4) 0   D    
Non-Qualified Stock Options (Right to Buy)   $35.00   10/8/2015     D         26697      (5) 3/17/2024   Common Stock   26697   $28.50   (5) 0   D    

Explanation of Responses:
( 1)  Represents time based vesting Restricted Stock Units ("RSUs") issued upon the settlement of Performance Share Units ("PSUs") of the Issuer. The PSUs were accelerated in full (with performance-based conditions for such units treated as having been obtained at the "maximum" level), and, immediately thereafter, vesting of the underlying RSUs were accelerated in full immediately prior to the Issuer's merger with St. Jude Medical, Inc., a Minnesota corporation.
( 2)  This option, which is fully vested and exercisable, was cancelled pursuant to the terms and conditions of an Agreement and Plan of Merger executed by the Issuer in exchange for a cash payment equal to (i) the number of shares of Issuer common stock underlying the option multiplied by (ii) the excess of $63.50 over the per share exercise price of such option.
( 3)  This option, which provided for vesting in four equal annual installments commencing one year after March 9, 2012, was cancelled pursuant to the terms and conditions of an Agreement and Plan of Merger executed by the Issuer in exchange for a cash payment equal to (i) the number of shares of Issuer common stock underlying the option multiplied by (ii) the excess of $63.50 over the per share exercise price of such option.
( 4)  This option, which provided for vesting in four equal annual installments commencing one year after March 7, 2013, was cancelled pursuant to the terms and conditions of an Agreement and Plan of Merger executed by the Issuer in exchange for a cash payment equal to (i) the number of shares of Issuer common stock underlying the option multiplied by (ii) the excess of $63.50 over the per share exercise price of such option.
( 5)  This option, which provided for vesting in four equal annual installments commencing one year after March 17, 2014, was cancelled pursuant to the terms and conditions of an Agreement and Plan of Merger executed by the Issuer in exchange for a cash payment equal to (i) the number of shares of Issuer common stock underlying the option multiplied by (ii) the excess of $63.50 over the per share exercise price of such option.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Lehman David Aaron
6035 STONERIDGE DRIVE
PLEASANTON, CA 94588

SVP and General Counsel

Signatures
/s/ David A. Lehman 10/8/2015
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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