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

Rhea-AI Filing Summary

Vicor Corporation Chairman and CEO Patrizio Vinciarelli reported open-market sales of 50,000 shares of common stock on March 19, 2026. The trades were executed in multiple blocks at weighted-average prices ranging from about $172.00 to $191.97, as detailed in the price-range footnotes.

After these sales, Vinciarelli directly owns 9,108,163 Vicor shares and has indirect beneficial ownership of 171,125 additional shares held in an irrevocable trust established for his child. The filing states the transactions were made under a pre-arranged Rule 10b5-1 trading plan adopted on November 3, 2025, indicating a scheduled, rather than discretionary, selling program.

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)
03/19/2026

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	03/19/2026		S(2)		8,339	D	$172.2553(3)	9,149,824	D
Common Stock	03/19/2026		S(2)		12,262	D	$173.1116(4)	9,137,562	D
Common Stock	03/19/2026		S(2)		2,599	D	$174.0805(5)	9,134,963	D
Common Stock	03/19/2026		S(2)		800	D	$175.2703(6)	9,134,163	D
Common Stock	03/19/2026		S(2)		400	D	$176.505(7)	9,133,763	D
Common Stock	03/19/2026		S(2)		600	D	$177.94(8)	9,133,163	D
Common Stock	03/19/2026		S(2)		500	D	$179.938(9)	9,132,663	D
Common Stock	03/19/2026		S(2)		2,383	D	$181.8552(10)	9,130,280	D
Common Stock	03/19/2026		S(2)		5,325	D	$182.7318(11)	9,124,955	D
Common Stock	03/19/2026		S(2)		5,262	D	$183.5928(12)	9,119,693	D
Common Stock	03/19/2026		S(2)		1,421	D	$184.7412(13)	9,118,272	D
Common Stock	03/19/2026		S(2)		1,095	D	$185.5971(14)	9,117,177	D
Common Stock	03/19/2026		S(2)		399	D	$186.8997(15)	9,116,778	D
Common Stock	03/19/2026		S(2)		400	D	$187.575(16)	9,116,378	D
Common Stock	03/19/2026		S(2)		2,917	D	$189.7778(17)	9,113,461	D
Common Stock	03/19/2026		S(2)		4,342	D	$190.2445(18)	9,109,119	D
Common Stock	03/19/2026		S(2)		956	D	$191.4501(19)	9,108,163	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 $172.0000 to $172.9700. 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 (19) 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 $173.0000 to $173.9800.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $174.0000 to $174.9700.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $175.0000 to $175.9000.

7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $176.4100 to $176.6300.

8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $177.9100 to $178.0400.

9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $179.5500 to $180.3100.

10. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $181.2000 to $182.1700.

11. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $182.2100 to $183.1800.

12. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $183.2100 to $184.2000.

13. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $184.2300 to $185.2200.

14. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $185.2300 to $186.0600.

15. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $186.2500 to $187.1900.

16. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $187.3300 to $187.8100.

17. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $189.0000 to $189.9700.

18. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $190.0100 to $190.8600.

19. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $191.1800 to $191.9700.

	/s/Kemble D. Morrison. Attorney in fact for Patrizio Vinciarelli	03/20/2026
	** 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 Patrizio Vinciarelli?

Vicor reported that Chairman and CEO Patrizio Vinciarelli sold 50,000 shares of common stock in open-market trades on March 19, 2026. The sales were broken into multiple transactions, each reported with weighted-average prices and detailed price ranges in the footnotes.

At what prices did the Vicor (VICR) CEO sell his shares on March 19, 2026?

The CEO’s 50,000 Vicor shares were sold at weighted-average prices spanning roughly $172.00 to $191.97 per share. Footnotes specify narrower ranges for each transaction block, such as $172.00–$172.97, $189.00–$189.97, and $191.18–$191.97, showing stepwise selling across that band.

How many Vicor (VICR) shares does Patrizio Vinciarelli own after the reported Form 4 sales?

After the March 19, 2026 transactions, Vinciarelli directly owns 9,108,163 Vicor common shares. He also has indirect beneficial ownership of 171,125 shares held in the Patrizio Vinciarelli Irrevocable Trust, which was established for the benefit of his child and for which he serves as trustee.

Were the March 19, 2026 Vicor (VICR) insider sales made under a Rule 10b5-1 plan?

Yes. The Form 4 states the sales were effected under a Rule 10b5-1 trading plan adopted on November 3, 2025. Such plans pre-schedule trades, indicating these dispositions followed a predetermined program rather than being timed as ad hoc, discretionary sales.

Does the Vicor (VICR) CEO hold any shares indirectly after the March 2026 transactions?

Yes. In addition to his direct holdings, Vinciarelli is trustee for 171,125 Vicor shares held in an irrevocable trust. The trust, dated December 21, 2012, was established for the benefit of his child, and those shares are reported as indirect beneficial ownership.