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 * SIMMS JAMES A 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)
CFO and Secretary
(Last)         (First)         (Middle)
25 FRONTAGE RD.
3. Date of Earliest Transaction (MM/DD/YYYY)
5/5/2020
(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  5/5/2020    M    5085  A $11.2534  52032 (1) D   
Common Stock (2) 5/5/2020    S    2849  D $53.1031  49183 (1) D   
Common Stock  5/5/2020    M    5085  A $11.2534  54268 (1) D   
Common Stock (2) 5/5/2020    S    2857  D $53.1031  51411 (1) D   
Common Stock  5/5/2020    M    14179  A $7.05  65590 (1) D   
Common Stock (2) 5/5/2020    S    7340  D $53.1031  58250 (1) 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 Option  $11.2534  5/5/2020    M        5085    (3) 11/1/2020  Common Stock  5085  $0  0  D   
Non Qualified Stock Option  $11.2534  5/5/2020    M        5085    (3) 11/1/2020  Common Stock  5085  $0  0  D   
Non Qualified Stock Option  $7.05  5/5/2020    M        14179    (3) 12/31/2020  Common Stock  14179  $0  0  D   

Explanation of Responses:
(1)  Includes 179 shares acquired under the Vicor Corporation 2017 Employee Stock Purchase Plan on August 31, 2019.
(2)  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.
(3)  This stock option is exercisable in full.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
SIMMS JAMES A
25 FRONTAGE RD.
ANDOVER, MA 01810
X
CFO and Secretary

Signatures
/s/Richard J. Nagel Jr. Attorney in fact for James A. Simms 5/6/2020
**Signature of Reporting Person Date
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