Vicor (VICR) CEO sells 50,000 shares under Rule 10b5-1 plan

Rhea-AI Filing Summary

Vicor Corporation Chairman and CEO Patrizio Vinciarelli sold 50,000 shares of common stock in open-market transactions. The trades occurred on March 13, 2026 at weighted average prices that, across the reported blocks, ranged from $165.03 to $176.15 per share.

Following these sales, Vinciarelli directly owns 9,308,163 Vicor shares. The filing also reports 171,125 shares held indirectly through an irrevocable trust established for the benefit of his child. The sales were executed pursuant to a pre-arranged Rule 10b5-1 trading plan adopted on November 3, 2025.

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^*

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)
03/13/2026

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	03/13/2026		S(2)		1,300	D	$165.2118(3)	9,356,863	D
Common Stock	03/13/2026		S(2)		2,638	D	$166.8336(4)	9,354,225	D
Common Stock	03/13/2026		S(2)		4,502	D	$167.6196(5)	9,349,723	D
Common Stock	03/13/2026		S(2)		6,926	D	$168.7107(6)	9,342,797	D
Common Stock	03/13/2026		S(2)		5,100	D	$169.9298(7)	9,337,697	D
Common Stock	03/13/2026		S(2)		7,937	D	$170.9326(8)	9,329,760	D
Common Stock	03/13/2026		S(2)		5,106	D	$171.7595(9)	9,324,654	D
Common Stock	03/13/2026		S(2)		8,291	D	$172.621(10)	9,316,363	D
Common Stock	03/13/2026		S(2)		3,714	D	$174.0147(11)	9,312,649	D
Common Stock	03/13/2026		S(2)		2,986	D	$175.2451(12)	9,309,663	D
Common Stock	03/13/2026		S(2)		1,500	D	$175.7998(13)	9,308,163	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 $165.0300 to $165.9000. 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 (13) 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 $166.1700 to $167.1400.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $167.1900 to $168.1700.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $168.2100 to $169.2000.

7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $169.4000 to $170.3800.

8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $170.4000 to $171.3800.

9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $171.4800 to $172.4300.

10. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $172.5100 to $173.1700.

11. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $173.5100 to $174.5000.

12. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $174.5700 to $175.5500.

13. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $175.5700 to $176.1500.

	/s/Kemble D. Morrison. Attorney in fact for Patrizio Vinciarelli	03/16/2026
	** 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

How many Vicor (VICR) shares did CEO Patrizio Vinciarelli sell in this Form 4?

CEO Patrizio Vinciarelli sold 50,000 Vicor common shares in this transaction. The Form 4 groups 11 open-market sale entries, which the transaction summary identifies as totaling 50,000 shares, all reported as non-derivative common stock sales on March 13, 2026.

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

The reported sales occurred at weighted average prices within several ranges. Footnotes state that individual trades were executed between $165.03 and $176.15 per share, with each line item showing a specific weighted average sale price within those ranges.

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

After the reported sales, Patrizio Vinciarelli directly holds 9,308,163 Vicor shares. The filing also lists 171,125 shares held indirectly through an irrevocable trust for his child, where he is identified as trustee, in addition to his large direct ownership position.

Were the Vicor (VICR) CEO’s stock sales made under a Rule 10b5-1 trading plan?

Yes. A footnote states the sales were effected under a Rule 10b5-1 trading plan adopted on November 3, 2025. Such plans are pre-arranged trading programs designed to allow insiders to sell shares on a scheduled basis, reducing concerns about trade timing.

Does the Vicor (VICR) Form 4 show any derivative exercises or just stock sales?

The Form 4 reports only non-derivative common stock sales totaling 50,000 shares. The transaction summary shows zero derivative exercises and an empty derivative position list, indicating no options or other derivative securities were exercised or converted in this filing.

What indirect Vicor (VICR) holdings does the CEO report in this Form 4?

The filing reports 171,125 Vicor shares held indirectly. A footnote explains these are owned by the Patrizio Vinciarelli Irrevocable Trust dated December 21, 2012, established for the benefit of his child, with Vinciarelli serving as trustee for those trust-held shares.