Vicor (VICR) CEO sells 50,000 shares, keeps over 9.3M stake

Rhea-AI Filing Summary

Vicor Corporation Chairman and CEO Patrizio Vinciarelli reported open-market sales of 50,000 shares of common stock on March 12, 2026 under a pre-arranged Rule 10b5-1 trading plan. The shares were sold in multiple transactions at weighted average prices between $163.11 and $173.22 per share.

After these sales, he directly holds 9,358,163 Vicor shares, reflecting a small reduction in his position, and also indirectly holds 171,125 shares as trustee of an irrevocable trust for his child. The filing classifies him as a director, Chairman, CEO, and more than ten percent owner, so these trades provide visibility into insider activity while still leaving him with a very large stake in the company.

Insights

Insider trading and governance analyst

CEO’s 50,000-share sale is small relative to a large remaining stake and executed under a 10b5-1 plan.

Patrizio Vinciarelli, Vicor’s Chairman, CEO, and 10% owner, sold 50,000 common shares on March 12, 2026 through open-market transactions. Prices ranged from $163.11 to $173.22, showing execution across a trading range rather than a single block.

The filing notes the sales were made under a Rule 10b5-1 trading plan adopted on November 3, 2025, indicating they were pre-scheduled rather than opportunistic. After the transactions, he still directly owns 9,358,163 shares and indirectly holds 171,125 shares as trustee of a family trust, suggesting the sale represents only a modest fraction of his total exposure.

Because there are no option exercises, gifts, or tax-related withholdings, the activity is a straightforward net reduction of 50,000 shares. Given the pre-planned nature and the large remaining ownership, the signal is best viewed as routine portfolio management rather than a thesis-changing move, though investors may note that a controlling insider continues to monetize a small portion of holdings at these price levels.

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 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)
03/12/2026

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	03/12/2026		S(2)		1,565	D	$163.7417(3)	9,406,598	D
Common Stock	03/12/2026		S(2)		4,067	D	$164.6095(4)	9,402,531	D
Common Stock	03/12/2026		S(2)		3,698	D	$165.5214(5)	9,398,833	D
Common Stock	03/12/2026		S(2)		10,277	D	$166.7728(6)	9,388,556	D
Common Stock	03/12/2026		S(2)		16,970	D	$167.5509(7)	9,371,586	D
Common Stock	03/12/2026		S(2)		5,378	D	$168.5803(8)	9,366,208	D
Common Stock	03/12/2026		S(2)		3,370	D	$169.5921(9)	9,362,838	D
Common Stock	03/12/2026		S(2)		3,375	D	$170.6654(10)	9,359,463	D
Common Stock	03/12/2026		S(2)		900	D	$171.6389(11)	9,358,563	D
Common Stock	03/12/2026		S(2)		400	D	$173.22(12)	9,358,163	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 $163.1100 to $164.1000. 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 (12) 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 $164.1400 to $165.1300.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $165.1400 to $166.0750.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $166.1600 to $167.1500.

7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $167.1600 to $168.1400.

8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $168.1600 to $169.1300.

9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $169.1900 to $170.1800.

10. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $170.1900 to $171.1100.

11. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $171.5300 to $171.7200.

12. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $173.2200 to $173.2200.

	/s/Kemble D. Morrison. Attorney in fact for Patrizio Vinciarelli	03/13/2026
	** 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

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

He sold a total of 50,000 shares of Vicor common stock. The transactions were reported as ten open-market sales on March 12, 2026, each at different weighted average prices, resulting in a combined net reduction of 50,000 shares in his direct holdings.

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

The reported sales occurred at weighted average prices between $163.11 and $173.22 per share. Each line item reflects multiple trades within narrow intraday ranges, with the Form 4 stating the CEO can provide full trade-by-trade detail upon request to investors or regulators.

How many Vicor (VICR) shares does the CEO still own after these transactions?

After the sales, he directly owns 9,358,163 shares of Vicor common stock. The Form 4 also shows an indirect holding of 171,125 shares held as trustee of an irrevocable trust for his child, indicating a substantial remaining economic interest.

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

Yes. A footnote explains the sales were effected pursuant to a Rule 10b5-1 trading plan adopted on November 3, 2025. Such plans pre-schedule trades, meaning the timing of these March 12, 2026 sales was determined in advance rather than decided spontaneously.

Does the Vicor (VICR) Form 4 involve any stock options or derivative exercises?

No. All reported transactions involve non-derivative common stock sales, with no option exercises or other derivative activity listed. The derivativeSummary is empty, and the transactionSummary shows zero exerciseCount and exerciseShares, indicating this filing reflects only direct share sales.

What indirect holdings are disclosed for the Vicor (VICR) CEO in this Form 4?

The filing shows an indirect position of 171,125 shares, held by the CEO as trustee of the Patrizio Vinciarelli Irrevocable Trust dated December 21, 2012. This trust was established for the benefit of his child, adding to his disclosed overall exposure to Vicor stock.