SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* SIMMS JAMES A (Last) (First) (Middle) 25 FRONTAGE RD. (Street) ANDOVER MA 01810 (City) (State) (Zip)	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
	3. Date of Earliest Transaction (Month/Day/Year) 03/01/2021
	4. If Amendment, Date of 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

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
Common Stock	03/01/2021		M		12,498	A	$6.29	25,748	D
Common Stock	03/01/2021		S		12,498	D	$101.2712	13,250	D
Common Stock	03/01/2021		M		2,484	A	$8.05	15,734	D
Common Stock	03/01/2021		S		2,484	D	$101.2712	13,250	D
Common Stock	03/01/2021		M		1,764	A	$5.67	15,014	D
Common Stock	03/01/2021		S		1,764	D	$101.2712	13,250	D
Common Stock	03/01/2021		M		13,504	A	$11.42	26,754	D
Common Stock	03/01/2021		S		13,504	D	$101.2712	13,250	D
Common Stock	03/01/2021		M		3,726	A	$13.42	16,976	D
Common Stock	03/01/2021		S		3,726	D	$101.2712	13,250	D
Common Stock	03/01/2021		M		3,771	A	$10.61	17,021	D
Common Stock	03/01/2021		S		3,771	D	$101.2712	13,250	D
Common Stock	03/01/2021		M		1,551	A	$19.35	14,801	D
Common Stock	03/01/2021		S		1,551	D	$101.2712	13,250	D
Common Stock	03/01/2021		M		425	A	$47.15	13,675	D
Common Stock	03/01/2021		S		425	D	$101.2712	13,250	D
Common Stock	03/01/2021		M		323	A	$31.05	13,573	D
Common Stock	03/01/2021		S		323	D	$101.2712	13,250	D
Common Stock	03/01/2021		S		1,947(1)	D	$101.3456	11,303	D

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 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: 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	$6.29	03/01/2021		M			12,498	(2)	06/17/2023	Common Stock	12,498	$0	20,000	D
Non Qualified Stock Option	$8.05	03/01/2021		M			2,484	(2)	06/20/2024	Common Stock	2,484	$0	0	D
Non Qualified Stock Option	$5.67	03/01/2021		M			1,764	(2)	06/21/2023	Common Stock	1,764	$0	0	D
Non Qualified Stock Option	$11.42	03/01/2021		M			13,504	(2)	10/23/2024	Common Stock	13,504	$0	0	D
Non Qualified Stock Option	$13.42	03/01/2021		M			3,726	(2)	06/15/2025	Common Stock	3,726	$0	0	D
Non Qualified Stock Option	$10.61	03/01/2021		M			3,771	(3)	06/17/2026	Common Stock	3,771	$0	942	D
Non Qualified Stock Option	$19.35	03/01/2021		M			1,551	(4)	06/16/2027	Common Stock	1,551	$0	1,033	D
Non Qualified Stock Option	$47.15	03/01/2021		M			425	(5)	06/15/2028	Common Stock	425	$0	636	D
Non Qualified Stock Option	$31.05	03/01/2021		M			323	(6)	06/28/2029	Common Stock	323	$0	1,288	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.

	/s/Richard J. Nagel Jr. Attorney in fact for James A. Simms	03/03/2021
	** 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 Number.