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
                                                                                  
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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 *

Tuozzolo Claudio
2. Issuer Name and Ticker or Trading Symbol

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

__X__ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
Corp. Vice President
(Last)          (First)          (Middle)

25 FRONTAGE ROAD
3. Date of Earliest Transaction (MM/DD/YYYY)

9/15/2020
(Street)

ANDOVER, MA 01810
(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 9/15/2020  M  4000 A$8.062 56912 D  
Common Stock (1)9/15/2020  S  2030 D$82.7623 54882 D  
Common Stock 9/15/2020  M  5000 A$8.05 59882 D  
Common Stock 9/15/2020  S  5000 D$82.7623 54882 D  
Common Stock 9/15/2020  S  1124 D$82.7623 53758 D  
Common Stock 9/16/2020  M  1212 A$8.05 54970 D  
Common Stock 9/16/2020  S  1212 D$83.4399 53758 D  
Common Stock 9/16/2020  M  6103 A$17.3038 59861 D  
Common Stock (1)9/16/2020  S  3468 D$83.4204 56393 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 Security3. Trans. Date3A. Deemed Execution Date, if any4. 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 Date7. 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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Non Qualified Stock Option $8.062 9/15/2020  M     4000   (2)4/14/2024 Common Stock 4000 $0 0 D  
Non Qualified Stock Option $8.05 9/15/2020  M     5000   (2)6/20/2024 Common Stock 5000 $0 1212 D  
Non Qualified Stock Option $8.05 9/16/2020  M     1212   (2)6/20/2024 Common Stock 1212 $0 0 D  
Non Qualified Stock Option $17.3038 9/16/2020  M     6103   (3)9/13/2023 Common Stock 6103 $0 1525 D  

Explanation of Responses:
(1) This transaction involved the exercise of non-qualified stock options, the terms of which provided for the purchase of shares of common stock possessing multi-year restrictions on their sale or transfer. As such, the exercise followed the sell-to-cover process, whereby a portion of the shares acquired through the exercise were sold in the open market, with the proceeds used to fund the aggregate exercise price of the options and the income and employment taxes associated with the exercise. The balance of the shares acquired through exercise that were delivered to the reporting person are subject to holding periods through the fifth anniversary of the date of this transaction.
(2) This stock option is exercisable in full.
(3) The remaining 1,525 stock options vest on 9/13/2021.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Tuozzolo Claudio
25 FRONTAGE ROAD
ANDOVER, MA 01810
X
Corp. Vice President

Signatures
/s/Richard J. Nagel Jr. Attorney in fact for Claudio Tuozzolo9/17/2020
**Signature of Reporting PersonDate

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