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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1. Name and Address of Reporting Person * KELLEHER BARRY   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 _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 25 FRONTAGE ROAD 3. Date of Earliest Transaction (Month/Day/Year) 08/30/2017 (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 08/30/2017   M   1,242 A $ 8.05 3,499 D   Common Stock 08/30/2017   S   1,242 D $ 18.7668 2,257 D   Common Stock 08/30/2017   M   943 A $ 10.61 3,200 D   Common Stock 08/30/2017   S   943 D $ 18.7668 2,257 D   Common Stock 08/30/2017   M   2,139 A $ 6.29 4,396 D   Common Stock 08/30/2017   S   2,139 D $ 18.7668 2,257 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

$ 8.05

08/30/2017

M

1,242

(1)

06/20/2024

Common Stock

1,242

$ 0

105,120

D

Non Qualified Stock Option

$ 10.61

08/30/2017

M

943

(2)

06/17/2026

Common Stock

943

$ 0

104,177

D

Non Qualified Stock Option

$ 6.29

08/30/2017

M

2,139

(3)

06/17/2023

Common Stock

2,139

$ 0

102,038

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
KELLEHER BARRY 25 FRONTAGE ROAD ANDOVER, MA 01810	X

Signatures

/s/Kemble D. Morrison Attorney in Fact for Barry Kelleher		08/31/2017
**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)	Granted on 6/20/2014 under the Company's Amended and Restated 2000 Stock Option and Incentive Plan and vest over a five year period.
(2)	Granted on 6/17/2016 under the Company's Amended and Restated 2000 Stock Option and Incentive Plan and vest over a five year period.
(3)	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.

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