Vicor (VICR) CEO sells 50,000 shares, retains 9,508,163

Rhea-AI Filing Summary

Vicor Corp Chairman and CEO Patrizio Vinciarelli reported open-market sales of 50,000 shares of common stock on March 9, 2026. The sales were executed in multiple trades at weighted-average prices ranging from $158.61 to $170.20, under a pre-arranged Rule 10b5-1 trading plan adopted on November 3, 2025.

Following these transactions, he directly holds 9,508,163 Vicor shares and indirectly holds 171,125 shares as trustee of an irrevocable trust for the benefit of his child. The filing shows planned, programmatic selling by a long-term, large shareholder who continues to retain a substantial position.

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
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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 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)

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

3. Date of Earliest Transaction (Month/Day/Year)
03/09/2026

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								171,125	I	See Footnote(1)
Common Stock	03/09/2026		S(2)		3,466	D	$159.2269(3)	9,554,697	D
Common Stock	03/09/2026		S(2)		6,840	D	$160.1099(4)	9,547,857	D
Common Stock	03/09/2026		S(2)		8,622	D	$161.1415(5)	9,539,235	D
Common Stock	03/09/2026		S(2)		2,622	D	$162.0645(6)	9,536,613	D
Common Stock	03/09/2026		S(2)		1,363	D	$163.2432(7)	9,535,250	D
Common Stock	03/09/2026		S(2)		3,718	D	$164.3529(8)	9,531,532	D
Common Stock	03/09/2026		S(2)		6,453	D	$165.183(9)	9,525,079	D
Common Stock	03/09/2026		S(2)		3,046	D	$166.0992(10)	9,522,033	D
Common Stock	03/09/2026		S(2)		1,620	D	$167.306(11)	9,520,413	D
Common Stock	03/09/2026		S(2)		600	D	$168.041(12)	9,519,813	D
Common Stock	03/09/2026		S(2)		7,449	D	$169.1572(13)	9,512,364	D
Common Stock	03/09/2026		S(2)		4,201	D	$170.023(14)	9,508,163	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 $158.6100to $159.5800. 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 $159.6300 to $160.6000.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $160.6500 to $161.6400.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $161.6800 to $162.6700.

7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $162.6900 to $163.6600.

8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $163.6900 to $164.6700.

9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $164.6900 to $165.6800.

10. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $165.7200 to $166.5500.

11. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $166.7400 to $167.7300.

12. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $167.7400 to $168.6700.

13. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $168.7400 to $169.7100.

14. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $169.7700 to $170.2000.

	/s/Kemble D. Morrison. Attorney in fact for Patrizio Vinciarelli	03/11/2026
	** 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.
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FAQ

What insider transaction did VICOR (VICR) report for Patrizio Vinciarelli?

Vicor reported that Chairman and CEO Patrizio Vinciarelli sold 50,000 common shares. The sales occurred on March 9, 2026, through multiple open-market trades, as disclosed in a Form 4 insider filing with detailed price ranges and post-transaction holdings.

At what prices did the VICOR (VICR) CEO sell his 50,000 shares?

The 50,000 shares were sold at weighted-average prices between $158.61 and $170.20 per share. Each Form 4 line reflects an average price, with footnotes explaining that numerous individual trades occurred within specific price ranges throughout the day.

How many VICOR (VICR) shares does Patrizio Vinciarelli hold after the reported sales?

After the transactions, Vinciarelli directly holds 9,508,163 VICOR shares. He also indirectly holds 171,125 shares as trustee of an irrevocable trust for the benefit of his child, according to the ownership details and footnotes in the Form 4 filing.

Was the VICOR (VICR) CEO’s 50,000-share sale part of 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 trades were pre-scheduled and not newly decided based on short-term market movements or recent company developments.

Does the VICOR (VICR) Form 4 show any option exercises or derivative transactions?

No option exercises or derivative transactions are reported in this Form 4. The filing only lists non-derivative common stock sales and a separate indirect holding entry, with the derivativeSummary section showing no remaining derivative positions disclosed in this particular report.

What indirect ownership in VICOR (VICR) does Patrizio Vinciarelli report?

Vinciarelli reports indirect ownership of 171,125 Vicor shares. Footnotes explain these shares are held by him as trustee of the Patrizio Vinciarelli Irrevocable Trust dated December 21, 2012, established for the benefit of his child, clarifying the nature of this indirect holding.