SEC FORM 4

SEC FORM 4SEC 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

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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

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)
03/18/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock								171,125	I	See Footnote⁽¹⁾
Common Stock	03/18/2026		S⁽²⁾		5,668	D	$191.8731⁽³⁾	9,202,495	D
Common Stock	03/18/2026		S⁽²⁾		3,138	D	$193.5652⁽⁴⁾	9,199,357	D
Common Stock	03/18/2026		S⁽²⁾		6,464	D	$194.3913⁽⁵⁾	9,192,893	D
Common Stock	03/18/2026		S⁽²⁾		7,105	D	$195.3109⁽⁶⁾	9,185,788	D
Common Stock	03/18/2026		S⁽²⁾		6,506	D	$196.2479⁽⁷⁾	9,179,282	D
Common Stock	03/18/2026		S⁽²⁾		7,081	D	$197.3563⁽⁸⁾	9,172,201	D
Common Stock	03/18/2026		S⁽²⁾		6,768	D	$198.3081⁽⁹⁾	9,165,433	D
Common Stock	03/18/2026		S⁽²⁾		4,600	D	$199.6454⁽¹⁰⁾	9,160,833	D
Common Stock	03/18/2026		S⁽²⁾		1,870	D	$200.1825⁽¹¹⁾	9,158,963	D
Common Stock	03/18/2026		S⁽²⁾		800	D	$201.05⁽¹²⁾	9,158,163	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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 $191.6700 to $192.4100. 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 $192.8200 to $193.8100.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $193.8200 to $194.8100.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $194.8200 to $195.7600.

7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $195.8200 to $196.8100.

8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $196.8300 to $197.8200.

9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $197.8300 to $198.7200.

10. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $199.0000 to $199.9800.

11. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $200.0200 to $201.0000.

12. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $201.0500 to $201.0500.

	/s/Quentin A. Fendelet. Attorney in fact for Patrizio Vinciarelli	03/19/2026
	** 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)

SEC Form 4 filed by Vinciarelli Patrizio