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 * 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) VICOR CORPORATION, 25 FRONTAGE RD. 3. Date of Earliest Transaction (Month/Day/Year) 05/30/2018 (Street) ANDOVER, MA 01810 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 Common Stock 05/30/2018   A   9,480 (1) A (1) 9,790 D   Common Stock 06/04/2018   M   2,558 A $ 6.29 12,348 D   Common Stock 06/04/2018   S   2,558 D $ 45.85 9,790 D   Common Stock 06/11/2018   M   6,356 A $ 19.86 16,146 D   Common Stock 06/11/2018   S   4,564 D $ 48.255 11,582 D

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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	$ 19.86	05/30/2018		A		6,356		(2)	06/12/2018	Common Stock	6,356	(3)	6,356	D
Non Qualified Stock Option	$ 11.25	05/30/2018		A		67,604		(2)	11/01/2020	Common Stock	67,604	(3)	67,604	D
Non Qualified Stock Option	$ 12.57	05/30/2018		A		12,878		(2)	06/18/2022	Common Stock	12,878	(3)	12,878	D
Non Qualified Stock Option	$ 17.3	05/30/2018		A		7,628		(4)	09/13/2023	Common Stock	7,628	(3)	7,628	D
Non Qualified Stock Option	$ 8.06	05/30/2018		A		31,327		(5)	04/14/2024	Common Stock	31,327	(3)	31,327	D
Non Qualified Stock Option	$ 12.19	05/30/2018		A		6,356		(6)	07/21/2024	Common Stock	6,356	(3)	6,356	D
Non Qualified Stock Option	$ 8.06	05/30/2018		A		1,220		(7)	09/10/2024	Common Stock	1,220	(3)	1,220	D
Non Qualified Stock Option	$ 6.29	06/04/2018		M			2,558	(8)	06/17/2023	Common Stock	2,558	$ 0	13,137	D
Non Qualified Stock Option	$ 19.86	06/11/2018		M			6,356	(2)	06/12/2018	Common Stock	6,356	$ 0	0	D
Non Qualified Stock Option	$ 47.15	06/15/2018		A		1,061		(9)	06/15/2028	Common Stock	1,061	$ 0	1,061	D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Tuozzolo Claudio VICOR CORPORATION 25 FRONTAGE RD. ANDOVER, MA 01810	X		Corp. Vice President

Signatures

/s/Richard J. Nagel Jr. Attorney in fact for Claudio Tuozzolo		06/19/2018
**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)	Received in exchange for shares of Picor Corporation common stock in connection with the merger of Picor Corporation into Vicor Corporation (the "Merger").
(2)	This stock option is exercisable in full.
(3)	In the Merger, each outstanding stock option was amended to provide that it will be settled in shares of Vicor Corporation common stock, and to adjust the number of shares issuable pursuant to the Merger's exchange ratio.
(4)	This stock option becomes exercisable in five equal installments on 5/30/18, 9/13/18, 9/13/19, 9/13/20 and 9/13/21.
(5)	25,061 stock options are exercisable at 5/30/18. The remaining 6,266 stock options become exercisable on 4/14/19.
(6)	This stock option becomes exercisable in five equal installments on 7/21/18, 7/21/19, 7/21/20, 7/21/21 and 7/21/22.
(7)	732 stock options are exercisable at 5/30/18. The remaining 488 stock options vest in two equal installments on 9/10/18 and 9/10/19.
(8)	Granted on 6/17/2013 under the Company's Amended and Restated 2000 Stock Option and Incentive Plan and vest over a five year period.
(9)	Granted on 6/15/2018 under the Company's Amended and Restated 2000 Stock Option and Incentive Plan and vest over a five year period.

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