Was the Vicor (VICR) CEO’s 50,000-share sale under a Rule 10b5-1 plan?

Yes. The filing states the sale was made under a Rule 10b5-1 trading plan adopted on November 3, 2025 . Such plans pre-arrange trades, helping separate personal portfolio decisions from day-to-day market or company news.

Vicor Corp (VICR) CEO sells 50,000 shares in planned stock trades

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

The CEO reported selling 50,000 shares of Vicor common stock. These were executed as a series of open-market transactions on March 4, 2026 , at weighted average prices ranging from about $195.26 to $208.18 per share.

Q: How many Vicor (VICR) shares does CEO Patrizio Vinciarelli own after the reported sales?

After the March 4, 2026 transactions, he directly owns 9,658,163 shares of Vicor common stock. Additionally, 171,125 shares are held indirectly in an irrevocable trust where he serves as Trustee for the benefit of his child.

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

The Form 4 reports 171,125 shares held indirectly, with the CEO as Trustee of the Patrizio Vinciarelli Irrevocable Trust . The trust was established for the benefit of his child, clarifying that these shares are held in a fiduciary capacity.

Q: Does the Vicor (VICR) CEO remain a significant shareholder after this Form 4 transaction?

Yes. Despite selling 50,000 shares , the CEO continues to hold a large position, with 9,658,163 shares owned directly plus 171,125 shares held through an irrevocable trust. The sale represents only a small fraction of his reported holdings.

Filing Impact

(Very High)

Filing Sentiment

(Very Negative)

Form Type

Rhea-AI Filing Summary

Vicor Corp Chairman and CEO Patrizio Vinciarelli reported selling 50,000 shares of Vicor common stock in open-market transactions on March 4, 2026. The sales were executed in multiple blocks at weighted average prices ranging from $195.26 to $208.18 per share.

After these trades, he directly holds 9,658,163 Vicor shares. An additional 171,125 shares are held indirectly, where he is Trustee of the Patrizio Vinciarelli Irrevocable Trust established for the benefit of his child. The filing notes the sales were made under a Rule 10b5-1 trading plan adopted on November 3, 2025.

Insights

Vicor’s CEO executed pre-planned open-market sales totaling 50,000 shares, a modest reduction in his large stake.

Patrizio Vinciarelli, Vicor’s Chairman, CEO, and more-than-10% owner, reported selling 50,000 shares of common stock on March 4, 2026 through a series of open-market trades. Reported weighted average sale prices ranged from $195.26 to $208.18 per share.

The Form 4 indicates these transactions were carried out under a Rule 10b5-1 trading plan adopted on November 3, 2025, which is designed to pre-schedule trades and reduce discretion. Following the sales, he still directly owns 9,658,163 shares, and 171,125 shares are held in an irrevocable trust where he serves as Trustee.

The disclosure shows continued substantial ownership by the CEO despite the sale, suggesting this is portfolio management rather than a transformational change in alignment. Overall, the information is routine for an insider with a large stake, and its impact on the broader investment thesis appears limited based on the figures disclosed.

Insider Trade Summary

Net Seller: 50,000 shares ($10,077,244)

Net Sell 14 txns

Insider VINCIARELLI PATRIZIO

Role Chairman and CEO

Sold 50,000 shs ($10.08M)

Type	Security	Shares	Price	Value
Sale	Common Stock	917	$195.8747	$180K
Sale	Common Stock	2,427	$196.756	$478K
Sale	Common Stock	2,563	$197.8313	$507K
Sale	Common Stock	5,954	$199.0215	$1.18M
Sale	Common Stock	10,450	$199.8058	$2.09M
Sale	Common Stock	3,569	$200.8116	$717K
Sale	Common Stock	2,200	$201.8927	$444K
Sale	Common Stock	9,528	$202.9806	$1.93M
Sale	Common Stock	3,950	$204.0312	$806K
Sale	Common Stock	3,314	$205.0921	$680K
Sale	Common Stock	2,528	$206.0347	$521K
Sale	Common Stock	2,300	$207.1226	$476K
Sale	Common Stock	300	$208.06	$62K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 9,707,246 shares (Direct); Common Stock — 171,125 shares (Indirect, See footnote)

Footnotes (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. This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 3, 2025. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $195.2600 to $196.2500. 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 (15) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $196.3100 to $197.3000 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $197.3100 to $198.3000. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $198.3400 to $199.3200. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $199.3400 to $200.3300. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $200.3400 to $201.3100. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $201.4300 to $202.4100. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $202.5200 to $203.5000. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $203.5200 to $204.5000. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $204.5700 to $205.5500. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $205.6550 to $206.5300. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $206.6600 to $207.5900. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $207.9500 to $208.1800.

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Form 4 Insider Transactions: What Each Field Means →

03/06/2026 - 10:40 AM

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).

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 ROAD

(Street)

ANDOVER

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)
03/04/2026

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)
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	03/04/2026		S⁽²⁾		917	D	$195.8747⁽³⁾	9,707,246	D
Common Stock	03/04/2026		S⁽²⁾		2,427	D	$196.756⁽⁴⁾	9,704,819	D
Common Stock	03/04/2026		S⁽²⁾		2,563	D	$197.8313⁽⁵⁾	9,702,256	D
Common Stock	03/04/2026		S⁽²⁾		5,954	D	$199.0215⁽⁶⁾	9,696,302	D
Common Stock	03/04/2026		S⁽²⁾		10,450	D	$199.8058⁽⁷⁾	9,685,852	D
Common Stock	03/04/2026		S⁽²⁾		3,569	D	$200.8116⁽⁸⁾	9,682,283	D
Common Stock	03/04/2026		S⁽²⁾		2,200	D	$201.8927⁽⁹⁾	9,680,083	D
Common Stock	03/04/2026		S⁽²⁾		9,528	D	$202.9806⁽¹⁰⁾	9,670,555	D
Common Stock	03/04/2026		S⁽²⁾		3,950	D	$204.0312⁽¹¹⁾	9,666,605	D
Common Stock	03/04/2026		S⁽²⁾		3,314	D	$205.0921⁽¹²⁾	9,663,291	D
Common Stock	03/04/2026		S⁽²⁾		2,528	D	$206.0347⁽¹³⁾	9,660,763	D
Common Stock	03/04/2026		S⁽²⁾		2,300	D	$207.1226⁽¹⁴⁾	9,658,463	D
Common Stock	03/04/2026		S⁽²⁾		300	D	$208.06⁽¹⁵⁾	9,658,163	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 $195.2600 to $196.2500. 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 (15) 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 $196.3100 to $197.3000

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $197.3100 to $198.3000.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $198.3400 to $199.3200.

7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $199.3400 to $200.3300.

8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $200.3400 to $201.3100.

9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $201.4300 to $202.4100.

10. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $202.5200 to $203.5000.

11. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $203.5200 to $204.5000.

12. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $204.5700 to $205.5500.

13. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $205.6550 to $206.5300.

14. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $206.6600 to $207.5900.

15. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $207.9500 to $208.1800.

	/s/Quentin A. Fendelet Attorney in Fact for Patrizio Vinciarelli	03/06/2026
	** 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.

Source: View Original Filing on SEC EDGAR

FAQ

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

The CEO reported selling 50,000 shares of Vicor common stock. These were executed as a series of open-market transactions on March 4, 2026, at weighted average prices ranging from about $195.26 to $208.18 per share.

At what prices did the Vicor (VICR) CEO’s March 4, 2026 stock sales occur?

The reported sales occurred at weighted average prices between $195.26 and $208.18 per share. Each line item reflects shares sold in multiple trades within specific price ranges, as detailed in the Form 4 footnotes.

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

After the March 4, 2026 transactions, he directly owns 9,658,163 shares of Vicor common stock. Additionally, 171,125 shares are held indirectly in an irrevocable trust where he serves as Trustee for the benefit of his child.

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

The Form 4 reports 171,125 shares held indirectly, with the CEO as Trustee of the Patrizio Vinciarelli Irrevocable Trust. The trust was established for the benefit of his child, clarifying that these shares are held in a fiduciary capacity.

Does the Vicor (VICR) CEO remain a significant shareholder after this Form 4 transaction?

Yes. Despite selling 50,000 shares, the CEO continues to hold a large position, with 9,658,163 shares owned directly plus 171,125 shares held through an irrevocable trust. The sale represents only a small fraction of his reported holdings.