Vicor (VICR) officer sells 4,019 shares at $89.75; 12,680 left

Vicor Corporation (VICR) reported an insider transaction by Corporate Vice President, Engineering, Alex Gusinov.

Rhea-AI Filing Summary

Vicor Corporation (VICR) reported an insider transaction by Corporate Vice President, Engineering, Alex Gusinov. On 10/28/2025, he sold 4,019 shares of common stock at a price of $89.7503 per share.

Following this sale, Gusinov beneficially owns 12,680 shares, held directly. This balance includes 27 shares acquired under the Vicor Corporation 2017 Employee Stock Purchase Plan on August 29, 2025.

Insider Trade Summary

Net Seller: 4,019 shares

Net Sell 1 txn

Insider Gusinov Alex

Role Corp. Vice President Eng.

Sold 4,019 shs ($361K)

Type	Security	Shares	Price	Value
Sale	Common Stock	4,019	$89.7503	$361K

Holdings After Transaction: Common Stock — 12,680 shares (Direct)

Footnotes (1)

1. F1. Includes 27 shares acquired under the Vicor Corporation 2017 Employee Stock Purchase Plan on August 29 2025.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did VICR disclose?

A company officer, Alex Gusinov, sold 4,019 shares of Vicor common stock on 10/28/2025.

At what price were the VICR shares sold?

The shares were sold at an average price of $89.7503 per share.

How many VICR shares does the insider now own?

After the sale, the insider beneficially owns 12,680 shares, held directly.

Does the remaining ownership include ESPP shares?

Yes. It includes 27 shares acquired under the 2017 Employee Stock Purchase Plan on August 29, 2025.

What is the insider’s role at Vicor (VICR)?

The reporting person is an Officer, serving as Corporate Vice President, Engineering.

Was the transaction reported as a sale (S) on the form?

Yes. The Form 4 lists the transaction code S for a sale of common stock.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 10/29/2025 - 12:28 PM Learn about SEC filing dates

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).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Gusinov Alex

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Corp. Vice President Eng.

3. Date of Earliest Transaction (Month/Day/Year)
10/28/2025

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	10/28/2025		S		4,019	D	$89.7503	12,680(1)	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

Explanation of Responses:

1. Includes 27 shares acquired under the Vicor Corporation 2017 Employee Stock Purchase Plan on August 29 2025.

	/s/Quentin A. Fendelet. Attorney in fact for Alex Gusinov	10/29/2025
	** 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.