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 *

PETERSEN WILLIAM 		2. Issuer Name and Ticker or Trading Symbol

SUPERTEX INC [ SUPX ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
VP, Worldwide Sales
(Last)          (First)          (Middle)

1235 BOARDEAUX DR. 		3. Date of Earliest Transaction (MM/DD/YYYY)

4/1/2014
(Street)

SUNNYVALE, CA 94089
(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

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
Stock Option (right to buy)   $33.95   4/1/2014     D         25000      (1) 12/2/2017   Common Stock   25000   $0.00   (2) 0   D    
Stock Option (right to buy)   $20.85   4/1/2014     D         25000      (1) 11/30/2018   Common Stock   25000   $12.15   (4) 0   D    
Stock Option (right to buy)   $19.51   4/1/2014     D         10000      (3) 8/30/2021   Common Stock   10000     (5) 0   D    

Explanation of Responses:
( 1)  This option is fully vested.
( 2)  Pursuant to that certain Agreement and Plan of Merger dated as of February 9, 2014 (the "Merger Agreement"), by and among Supertex, Inc., a California corporation (the "Issuer"), Microchip Technology Incorporated, a Delaware corporation ("Microchip"), and Orchid Acquisition Corporation, a California corporation and a wholly owned subsidiary of Microchip ("Merger Sub"), pursuant to which Merger Sub merged with and into the Issuer with the Issuer surviving the merger as a wholly owned subsidiary of Microchip (the "Merger"), this out of the money option was canceled.
( 3)  This option becomes exercisable at the rate of 50% of the underlying shares on the third anniversary of the grant date, with 50% vesting the following year.
( 4)  Pursuant to the Merger Agreement, this option was cancelled and converted in to the right to receive a cash payment equal to the number of shares of the Issuer's common stock underlying this option multiplied by the amount, if any, that $33.00 exceeded the exercise price of the this option, less any applicable withholding taxes.
( 5)  Pursuant to the Merger Agreement, this option was converted into an option to acquire the number of shares of Microchip common stock determined by multiplying the number of shares of Issuer common stock subject to this option by 0.697, with an exercise price per share determined by dividing the exercise price per share of this option by 0.697, and otherwise subject to substantially the same terms and conditions as applied to this option.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
PETERSEN WILLIAM
1235 BOARDEAUX DR.
SUNNYVALE, CA 94089

VP, Worldwide Sales

Signatures
/s/ William Petersen 4/3/2014
** 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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