Vicor (VICR) CEO Vinciarelli sells 50,000 shares in pre-set 10b5-1 trades

Rhea-AI Filing Summary

Vicor Corporation Chairman and CEO Patrizio Vinciarelli reported open-market sales of a total of 50,000 shares of Common Stock on March 17, 2026. The shares were sold in multiple transactions at weighted average prices ranging from $185.75 to $196.41 per share.

After these sales, Vinciarelli directly owns 9,208,163 Vicor shares and also has 171,125 shares held indirectly as trustee of an irrevocable trust for the benefit of his child. The filing notes that the sales were made under a Rule 10b5-1 trading plan adopted on November 3, 2025, indicating they were pre-scheduled rather than discretionary trades.

Insights

Insider trading & governance analyst

Vicor’s CEO sold 50,000 pre-planned shares but retains a very large stake.

Patrizio Vinciarelli, Vicor’s Chairman, CEO, and a more than 10% owner, executed open-market sales totaling 50,000 Common Stock shares on March 17, 2026. Sale prices spanned weighted averages between $185.75 and $196.41 per share across several trades.

The filing shows he still holds 9,208,163 shares directly, plus 171,125 shares indirectly as trustee of an irrevocable trust for his child. This indicates the transactions reduce, but do not fundamentally alter, his equity exposure based on the information presented.

A key detail is that the sales were made under a Rule 10b5-1 trading plan adopted on November 3, 2025. Such plans pre-schedule trades, so the timing of these sales carries less informational weight than an unscheduled sale; further context, if any, would come from future company disclosures.

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)
03/17/2026

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	03/17/2026		S(2)		2,333	D	$186.4171(3)	9,255,830	D
Common Stock	03/17/2026		S(2)		4,751	D	$187.1623(4)	9,251,079	D
Common Stock	03/17/2026		S(2)		7,392	D	$188.4197(5)	9,243,687	D
Common Stock	03/17/2026		S(2)		9,911	D	$189.2437(6)	9,233,776	D
Common Stock	03/17/2026		S(2)		4,694	D	$190.7346(7)	9,229,082	D
Common Stock	03/17/2026		S(2)		9,612	D	$191.6298(8)	9,219,470	D
Common Stock	03/17/2026		S(2)		2,677	D	$192.4531(9)	9,216,793	D
Common Stock	03/17/2026		S(2)		1,201	D	$193.4039(10)	9,215,592	D
Common Stock	03/17/2026		S(2)		800	D	$194.3938(11)	9,214,792	D
Common Stock	03/17/2026		S(2)		6,535	D	$196.0642(12)	9,208,257	D
Common Stock	03/17/2026		S(2)		94	D	$196.41(13)	9,208,163	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 $185.7500 to $186.7400. 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 $186.7500 to $187.7400.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $187.7800 to $188.7700.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $188.8000 to $189.7500.

7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $190.1300 to $191.1200.

8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $191.1300 to $192.1200.

9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $192.1300 to $193.1100.

10. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $193.1400 to $193.5000.

11. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $194.1400 to $194.5600.

12. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $195.4000 to $196.3300.

13. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $196.4100 to $196.4100.

	/s/Kemble D. Morrison. Attorney in fact for Patrizio Vinciarelli	03/18/2026
	** 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 VICR shares did CEO Patrizio Vinciarelli sell in this Form 4?

Patrizio Vinciarelli reported selling a total of 50,000 shares of Vicor (VICR) Common Stock on March 17, 2026. The shares were sold in multiple open-market transactions at weighted average prices ranging from $185.75 to $196.41 per share.

What price range did the VICR CEO’s March 17, 2026 stock sales cover?

The CEO’s reported Vicor (VICR) share sales occurred at weighted average prices ranging from $185.75 to $196.41 per share. Each line item reflects aggregated trades within narrower intraday ranges, as detailed in the accompanying footnotes of the Form 4 filing.

How many VICR shares does Patrizio Vinciarelli hold after this Form 4?

After the reported transactions, Patrizio Vinciarelli directly owns 9,208,163 shares of Vicor Common Stock. The filing also shows an additional 171,125 shares held indirectly, where he serves as trustee of an irrevocable trust benefiting his child.

Were the VICR CEO’s March 17, 2026 stock sales under a 10b5-1 plan?

Yes. The Form 4 states that the March 17, 2026 sales were effected pursuant to a Rule 10b5-1 trading plan adopted on November 3, 2025. Such plans pre-arrange trades, suggesting the timing reflects preset instructions rather than a new discretionary decision.

Does the VICR Form 4 show any indirect share holdings for the CEO?

The Form 4 reports 171,125 Vicor shares held indirectly, with Vinciarelli as trustee of the Patrizio Vinciarelli Irrevocable Trust dated December 21, 2012. The trust is established for the benefit of his child, according to the filing footnotes.