Vicor (VICR) VP sells 6,000 common shares in open-market trade

Rhea-AI Filing Summary

Vicor Corp corporate vice president of engineering for power systems Sean Crilly reported an open-market sale of 6,000 shares of Vicor common stock. The sale took place on February 27, 2026 at a price of $197.7319 per share. After this transaction, Crilly directly owned 9,729 shares of Vicor common stock. A footnote explains that this balance includes 197 shares acquired under the Vicor Corporation 2017 Employee Stock Purchase Plan on February 27, 2026.

Insider Trade Summary

Net Seller: 6,000 shares ($1,186,391)

Net Sell 1 txn

Insider CRILLY SEAN

Role Corp. VP-Eng., Pwr Syst.

Sold 6,000 shs ($1.19M)

Type	Security	Shares	Price	Value
Sale	Common Stock	6,000	$197.7319	$1.19M

Holdings After Transaction: Common Stock — 9,729 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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^*

CRILLY SEAN

(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-Eng., Pwr Syst.

3. Date of Earliest Transaction (Month/Day/Year)
02/27/2026

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	02/27/2026		S		6,000	D	$197.7319	9,729(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 197 shares acquired under the Vicor Corporation 2017 Employee Stock Purchase Plan on February 27, 2026.

	/s/Quentin A. Fendelet Attorney in Fact for Sean Crilly	03/02/2026
	** 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 transaction did Vicor (VICR) report for Sean Crilly?

Vicor reported that executive Sean Crilly sold 6,000 shares of common stock in an open-market transaction on February 27, 2026. The sale was reported on a Form 4 insider filing and involved directly held Vicor shares.

At what price did Sean Crilly sell Vicor (VICR) shares?

Sean Crilly sold 6,000 Vicor common shares at a price of $197.7319 per share. This price reflects the weighted transaction price disclosed for the open-market sale on February 27, 2026.

How many Vicor (VICR) shares does Sean Crilly own after the sale?

After the reported sale, Sean Crilly directly owns 9,729 Vicor common shares. This post-transaction holding includes 197 shares acquired through the Vicor Corporation 2017 Employee Stock Purchase Plan on February 27, 2026.

What role does Sean Crilly hold at Vicor (VICR)?

Sean Crilly serves as Vicor’s Corporate Vice President of Engineering, Power Systems. His position as an officer requires reporting transactions in Vicor stock, such as this open-market sale, through Form 4 insider filings with regulators.

What does the footnote in Sean Crilly’s Vicor (VICR) filing explain?

The footnote explains that Crilly’s reported 9,729-share holding includes 197 shares acquired under the Vicor Corporation 2017 Employee Stock Purchase Plan. These plan shares were acquired on February 27, 2026 and are part of his directly owned common stock.

Was Sean Crilly’s Vicor (VICR) transaction a buy or sell?

The transaction was a sale of Vicor common stock by Sean Crilly. It is classified as an open-market sale, with the Form 4 using transaction code “S” and describing it as a sale in open market or private transaction.