XNAS:MSCC Microsemi Corp Insider Activity 4 Filing - 9/12/2012

Effective Date 9/12/2012

XNAS:MSCC (Microsemi Corp): Fair Value Estimate
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XNAS:MSCC (Microsemi Corp): Consider Buying
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XNAS:MSCC (Microsemi Corp): Consider Selling
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XNAS:MSCC (Microsemi Corp): Fair Value Uncertainty
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XNAS:MSCC (Microsemi Corp): Economic Moat
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XNAS:MSCC (Microsemi Corp): Stewardship
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FORM 4
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

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
LEIBEL DENNIS R
  2. Issuer Name and Ticker or Trading Symbol
MICROSEMI CORP [MSCC]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) __X__ Other (specify below)
Chairman of the Board
(Last)
(First)
(Middle)
ONE ENTERPRISE
3. Date of Earliest Transaction (Month/Day/Year)
09/12/2012
(Street)

ALISO VIEJO, CA 92656
4. If Amendment, Date Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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
Microsemi Common Stock(2) 09/12/2012   M   4,000 A $18.85 32,081 D  
Microsemi Common Stock(2) 09/12/2012   M   4,000 A $18.3 36,081 D  
Microsemi Common Stock(1) 09/12/2012   S   8,000 D $20.5357 28,081 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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. SEC 1474 (9-02)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction 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
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(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 Option Right to Buy Common Stock(2) $18.85 09/12/2012   M     4,000 09/29/2006 09/29/2012 Common Stock 4,000 $18.85 103,500 D  
Non-Qualified Stock Option Right to Buy Common Stock(2) $18.3 09/12/2012   M     4,000 02/21/2007 02/21/2013 Common Stock 4,000 $18.3 99,500 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
LEIBEL DENNIS R
ONE ENTERPRISE
ALISO VIEJO, CA 92656
  X     Chairman of the Board

Signatures

 Mark Lin, Attorney-in-Fact for Dennis R. Leibel   09/14/2012
** Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) Sale in accordance with a 10b5-1 plan adopted 02/07/2012.
(2) This non-qualified stock option was granted pursuant to Microsemi Corporation's 1987 Stock Plan, which satisfied the requirements of Rule 16b-3. The option became exercisable on the date of the grant.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.

XNAS:MSCC Microsemi Corp Insider Activity 4 Filling

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XNAS:MSCC Microsemi Corp Insider Activity 4 Filing - 9/12/2012
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