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)

3/1/2021
(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 3/1/2021  M  12498 A$6.29 25748 D  
Common Stock 3/1/2021  S  12498 D$101.2712 13250 D  
Common Stock 3/1/2021  M  2484 A$8.05 15734 D  
Common Stock 3/1/2021  S  2484 D$101.2712 13250 D  
Common Stock 3/1/2021  M  1764 A$5.67 15014 D  
Common Stock 3/1/2021  S  1764 D$101.2712 13250 D  
Common Stock 3/1/2021  M  13504 A$11.42 26754 D  
Common Stock 3/1/2021  S  13504 D$101.2712 13250 D  
Common Stock 3/1/2021  M  3726 A$13.42 16976 D  
Common Stock 3/1/2021  S  3726 D$101.2712 13250 D  
Common Stock 3/1/2021  M  3771 A$10.61 17021 D  
Common Stock 3/1/2021  S  3771 D$101.2712 13250 D  
Common Stock 3/1/2021  M  1551 A$19.35 14801 D  
Common Stock 3/1/2021  S  1551 D$101.2712 13250 D  
Common Stock 3/1/2021  M  425 A$47.15 13675 D  
Common Stock 3/1/2021  S  425 D$101.2712 13250 D  
Common Stock 3/1/2021  M  323 A$31.05 13573 D  
Common Stock 3/1/2021  S  323 D$101.2712 13250 D  
Common Stock 3/1/2021  S  1947 (1)D$101.3456 11303 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 $6.29 3/1/2021  M     12498   (2)6/17/2023 Common Stock 12498 $0 20000 D  
Non Qualified Stock Option $8.05 3/1/2021  M     2484   (2)6/20/2024 Common Stock 2484 $0 0 D  
Non Qualified Stock Option $5.67 3/1/2021  M     1764   (2)6/21/2023 Common Stock 1764 $0 0 D  
Non Qualified Stock Option $11.42 3/1/2021  M     13504   (2)10/23/2024 Common Stock 13504 $0 0 D  
Non Qualified Stock Option $13.42 3/1/2021  M     3726   (2)6/15/2025 Common Stock 3726 $0 0 D  
Non Qualified Stock Option $10.61 3/1/2021  M     3771   (3)6/17/2026 Common Stock 3771 $0 942 D  
Non Qualified Stock Option $19.35 3/1/2021  M     1551   (4)6/16/2027 Common Stock 1551 $0 1033 D  
Non Qualified Stock Option $47.15 3/1/2021  M     425   (5)6/15/2028 Common Stock 425 $0 636 D  
Non Qualified Stock Option $31.05 3/1/2021  M     323   (6)6/28/2029 Common Stock 323 $0 1288 D  
Explanation of Responses:
(1) The shares being sold were acquired under the Vicor 2017 Employee Stock Purchase Plan on 2/28/2018 (705 shares), 8/31/2018 (593 shares ), 2/28/2019 (470 shares) and 8/30/2019 (179 shares).
(2) This stock option is exercisable in full.
(3) Remaining options will vest on 6/17/2021.
(4) Remaining options will vest in equal installments on 6/16/2021 and 6/16/2022.
(5) Remaining options will vest in equal installments on 6/15/2021, 6/15/2022 and 6/15/2023.
(6) Remaining options will vest in equal installments on 6/28/2021, 6/28/2022, 6/28/2023 and 6/28/2024.
Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
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. Simms3/3/2021
**Signature of Reporting PersonDate
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