VICOR (VICR) CAO exercises 2,000 options and sells 2,299 shares

Rhea-AI Filing Summary

VICOR CORP corporate vice president and chief accounting officer Quentin A. Fendelet reported option exercises and share sales. On March 2, 2026, he exercised 2,000 Non Qualified Stock Options at $71.74 per share, receiving 2,000 shares of common stock. That same day, he sold a total of 2,299 shares of common stock in open-market transactions at $204.7209 per share, reducing his directly held common stock to 0 shares while retaining 2,000 options following the transactions.

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

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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^*

Fendelet Quentin 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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Corp. VP - CAO

3. Date of Earliest Transaction (Month/Day/Year)
03/02/2026

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	03/02/2026		S		299	D	$204.7209	0	D
Common Stock	03/02/2026		M		2,000	A	$71.74	2,000	D
Common Stock	03/02/2026		S		2,000	D	$204.7209	0	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	$71.74	03/02/2026		M			2,000	03/01/2026	03/01/2032	Common Stock	2,000	$0	2,000	D

Explanation of Responses:

	/s/Quentin A. Fendelet	03/03/2026
	** 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.

FAQ

What insider transactions did VICOR (VICR) report for Quentin A. Fendelet?

VICOR executive Quentin A. Fendelet reported both an option exercise and share sales. He exercised 2,000 non-qualified stock options and sold a total of 2,299 common shares in open-market transactions, all dated March 2, 2026.

How many VICOR (VICR) shares did Quentin A. Fendelet sell and at what price?

Quentin A. Fendelet sold 2,299 shares of VICOR common stock. The sales occurred at a price of $204.7209 per share on March 2, 2026, in open-market or private sale transactions, according to the Form 4 filing.

What stock options did Quentin A. Fendelet exercise in the VICOR (VICR) Form 4?

He exercised 2,000 Non Qualified Stock Options for VICOR shares. The exercise price was $71.74 per share, converting the options into common stock as reported for March 2, 2026, before subsequently selling common shares.

What is Quentin A. Fendelet’s role at VICOR (VICR) mentioned in the Form 4?

Quentin A. Fendelet is identified as a corporate vice president and chief accounting officer. The Form 4 specifies his officer title as “Corp. VP - CAO,” indicating he is a reporting officer under insider trading disclosure rules.

How many VICOR (VICR) common shares did Quentin A. Fendelet hold after the transactions?

After the reported transactions, Quentin A. Fendelet directly held 0 shares of VICOR common stock. The Form 4 shows total common shares following his sales on March 2, 2026, were reduced to zero under direct ownership.

Did Quentin A. Fendelet retain any VICOR (VICR) derivative securities after the Form 4 activity?

Yes. The Form 4 shows he retained 2,000 Non Qualified Stock Options after the March 2, 2026 transactions. The total options following the derivative exercise transaction are listed as 2,000 under direct ownership.