Vicor (VICR) CEO sells 23,179 shares under Rule 10b5-1 plan

Rhea-AI Filing Summary

Vicor Corporation Chairman and CEO Patrizio Vinciarelli reported open-market sales of a total of 23,179 shares of Vicor common stock on March 24, 2026, at weighted average prices of $179.0000, $180.0986, and $181.0021. These transactions were executed pursuant to a pre-arranged Rule 10b5-1 trading plan adopted on November 3, 2025. Following the sales, he directly holds 9,034,984 shares of common stock and indirectly holds 171,125 shares as trustee of an irrevocable trust established for the benefit of his child, indicating he remains a large shareholder.

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

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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).

X

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^*

VINCIARELLI PATRIZIO

(Last) (First) (Middle)

C/O VICOR CORPORATION

25 FRONTAGE RD.

(Street)

ANDOVER MASSACHUSETTS 01810

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
VICOR CORP [ VICR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	Chairman and CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/24/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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								171,125	I	See Footnote(1)
Common Stock	03/24/2026		S(2)		7,900	D	$179(3)	9,050,263	D
Common Stock	03/24/2026		S(2)		10,000	D	$180.0986(4)	9,040,263	D
Common Stock	03/24/2026		S(2)		5,279	D	$181.0021(5)	9,034,984	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. These shares are held by the reporting person as Trustee of the Patrizio Vinciarelli Irrevocable Trust U/A Dated 12/21/2012, established for the benefit of the child of the reporting person.

2. This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 3, 2025.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $179.0000 to $179.0000. The reporting person undertakes to provide to Vicor Corporation, any security holder of Vicor Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (3) through (5) to this Form 4.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $180.0000 to $180.3100.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $181.0000 to $181.0400.

	/s/Quentin A. Fendelet Attorney in fact for Patrizio Vinciarelli	03/25/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

How many Vicor (VICR) shares did CEO Patrizio Vinciarelli sell?

Patrizio Vinciarelli sold a total of 23,179 Vicor shares in reported open-market transactions. The sales occurred in three blocks and are shown at weighted average prices of $179.0000, $180.0986, and $181.0021 per share on March 24, 2026.

At what prices were the VICR shares sold by the CEO?

The CEO’s reported Vicor share sales were executed at weighted average prices of $179.0000, $180.0986, and $181.0021 per share. Footnotes explain each figure reflects multiple trades within narrow intraday price ranges for the respective transaction blocks.

How many Vicor (VICR) shares does the CEO hold after these sales?

After the reported sales, the CEO directly holds 9,034,984 Vicor common shares. In addition, he is trustee for an irrevocable trust that holds 171,125 shares for the benefit of his child, reflecting substantial ongoing equity exposure to the company.

Were the recent VICR share sales made under a Rule 10b5-1 plan?

Yes. A footnote states the sale was effected under a Rule 10b5-1 trading plan adopted by the reporting person on November 3, 2025. Such plans pre-schedule trades, indicating the transactions were arranged in advance rather than timed opportunistically.

Does the CEO have indirect holdings of Vicor (VICR) shares?

Yes. The filing notes 171,125 Vicor shares are held by the reporting person as trustee of the Patrizio Vinciarelli Irrevocable Trust dated December 21, 2012. The trust was established for the benefit of his child, giving him indirect beneficial ownership as trustee.

What is the nature of the insider transactions reported for Vicor (VICR)?

The Form 4 reports open-market sales of Vicor common stock by Chairman and CEO Patrizio Vinciarelli. All three transactions are coded “S” for sales of non-derivative common shares and were executed on March 24, 2026 under a Rule 10b5-1 plan.