Vicor (VICR) CEO Vinciarelli sells 44,076 shares under 10b5-1 plan

Rhea-AI Filing Summary

Vicor Corporation Chairman and CEO Patrizio Vinciarelli reported open-market sales of 44,076 shares of common stock on March 20, 2026. The shares were sold in multiple transactions at weighted average prices reported between $174.6395 and $188.8900 per share under a Rule 10b5-1 trading plan adopted on November 3, 2025.

Following these sales, he holds 9,064,087 shares directly and 171,125 shares indirectly as trustee of an irrevocable trust established for the benefit of his child. The transactions represent a small portion of his overall reported ownership.

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).

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)
03/20/2026

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	03/20/2026		S(2)		4,766	D	$174.6395(3)	9,103,397	D
Common Stock	03/20/2026		S(2)		3,010	D	$176.0011(4)	9,100,387	D
Common Stock	03/20/2026		S(2)		4,680	D	$177.8709(5)	9,095,707	D
Common Stock	03/20/2026		S(2)		13,126	D	$178.7527(6)	9,082,581	D
Common Stock	03/20/2026		S(2)		2,579	D	$179.7247(7)	9,080,002	D
Common Stock	03/20/2026		S(2)		2,201	D	$180.6218(8)	9,077,801	D
Common Stock	03/20/2026		S(2)		4,656	D	$181.7139(9)	9,073,145	D
Common Stock	03/20/2026		S(2)		1,958	D	$182.6354(10)	9,071,187	D
Common Stock	03/20/2026		S(2)		1,500	D	$184.668(11)	9,069,687	D
Common Stock	03/20/2026		S(2)		3,999	D	$186.2712(12)	9,065,688	D
Common Stock	03/20/2026		S(2)		1,101	D	$187.4259(13)	9,064,587	D
Common Stock	03/20/2026		S(2)		500	D	$188.89(14)	9,064,087	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 $174.1100 to $175.0700. 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 (14) 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 $175.2800 to $176.1900.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $177.2100 to $178.2000.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $178.2100 to $179.2000.

7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $179.2300 to $180.1700.

8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $180.3000 to $181.2700.

9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $181.3600 to $182.2000.

10. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $182.3900 to $182.9100.

11. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $184.4900 to $184.8200.

12. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $185.7000 to $186.5500.

13. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $186.7600 to $187.5900.

14. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $188.8400 to $189.0300.

	/s/Quentin A. Fendelet Attorney in fact for Patrizio Vinciarelli	03/23/2026
	** 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

What insider transaction did Vicor (VICR) report for its CEO?

Vicor’s CEO Patrizio Vinciarelli reported selling 44,076 common shares. The Form 4 shows multiple open-market sales of Vicor common stock executed on March 20, 2026, while he remained a large shareholder after the transactions.

At what prices did the Vicor (VICR) CEO sell his shares?

The reported weighted average prices range from $174.6395 to $188.8900 per share. Each sale block reflects a separate weighted average price, with detailed price ranges described across multiple footnotes to the Form 4 filing.

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

After the reported sales, the CEO holds 9,064,087 shares directly. The filing also shows indirect beneficial ownership of 171,125 additional shares held through an irrevocable trust for the benefit of his child, where he serves as trustee.

Was the Vicor (VICR) CEO’s stock sale made under a Rule 10b5-1 plan?

Yes. The filing states the sale was executed under a Rule 10b5-1 trading plan. The plan was adopted on November 3, 2025, indicating the transactions were pre-arranged rather than timed at the CEO’s sole discretion.

What does the indirect ownership in the Vicor (VICR) Form 4 represent?

The indirect holding reflects shares in an irrevocable trust. The Form 4 explains these shares are held by Patrizio Vinciarelli as trustee of the Patrizio Vinciarelli Irrevocable Trust dated December 21, 2012, for the benefit of his child.

How many total Vicor (VICR) shares were sold in this Form 4 filing?

The transaction summary shows net sales of 44,076 shares. These shares were sold across 12 separate open-market transactions in Vicor common stock, all on March 20, 2026, with no reported purchases or option exercises in this filing.