Vicor (NASDAQ: VICR) CEO trims stake with 20,000-share sale

Filing Impact

(Very High)

Filing Sentiment

(Very Negative)

Form Type

Rhea-AI Filing Summary

Vicor Corp Chairman and CEO Patrizio Vinciarelli, a more than 10% owner, reported open-market sales of 20,000 shares of common stock on June 1, 2026. The shares were sold in multiple transactions at weighted average prices, with ranges from $312.6400 to $329.5400 per share.

After these sales, Vinciarelli directly holds 8,807,290 shares of Vicor common stock and indirectly holds 167,125 shares as trustee of an irrevocable trust for his child. The filing states the sales were made under a pre-arranged Rule 10b5-1 trading plan adopted on February 26, 2026.

Insider Trade Summary 10b5-1

Net Seller: 20,000 shares ($6,437,096)

Net Sell 17 txns

Insider VINCIARELLI PATRIZIO

Role Chairman and CEO

Sold 20,000 shs ($6.44M)

Type	Security	Shares	Price	Value
Sale	Common Stock	800	$313.0488	$250K
Sale	Common Stock	800	$313.985	$251K
Sale	Common Stock	1,200	$315.0625	$378K
Sale	Common Stock	1,822	$316.2064	$576K
Sale	Common Stock	900	$317.4252	$286K
Sale	Common Stock	1,713	$318.5845	$546K
Sale	Common Stock	700	$319.5029	$224K
Sale	Common Stock	100	$320.16	$32K
Sale	Common Stock	1,767	$321.9307	$569K
Sale	Common Stock	1,437	$323.2778	$465K
Sale	Common Stock	1,598	$324.1038	$518K
Sale	Common Stock	2,026	$325.1937	$659K
Sale	Common Stock	1,100	$325.9797	$359K
Sale	Common Stock	1,000	$327.216	$327K
Sale	Common Stock	2,637	$328.5763	$866K
Sale	Common Stock	400	$329.4225	$132K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 8,807,290 shares (Direct, null); Common Stock — 167,125 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 February 26, 2026. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $312.6400 to $313.3800. 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 (18) 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 $313.6400 to $314.5800. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $314.6500 to $315.4700. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $315.6900 to $316.6300. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $316.9600 to $317.6700. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $318.1000 to $318.9400. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $319.1400 to $320.1300. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $320.1600 to $320.1600. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $321.4500 to $322.3700. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $322.5500 to $323.5300. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $323.5600 to $324.5500. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $324.6100 to $325.5500. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $325.6800 to $326.5800. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $326.9000 to $327.8600. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $327.9800 to $328.9400. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $329.3200 to $329.5400.

Key Figures

Shares sold: 20,000 shares Price range of sales: $312.6400–$329.5400 per share Direct holdings after sales: 8,807,290 shares +3 more

6 metrics

Shares sold 20,000 shares Open-market sales of common stock on June 1, 2026

Price range of sales $312.6400–$329.5400 per share Weighted average price ranges disclosed in multiple footnotes

Direct holdings after sales 8,807,290 shares Common stock directly owned by CEO after June 1, 2026 trades

Indirect trust holdings 167,125 shares Shares held as trustee of an irrevocable trust for his child

Rule 10b5-1 plan adoption date February 26, 2026 Trading plan governing the reported sales

Number of sale transactions 16 transactions Non-derivative open-market sale entries on June 1, 2026

Key Terms

Rule 10b5-1 trading plan, weighted average price, Irrevocable Trust, open-market sale, +1 more

5 terms

Rule 10b5-1 trading plan regulatory

"This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average price financial

"The price reported in Column 4 is a weighted average price"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

Irrevocable Trust financial

"Patrizio Vinciarelli Irrevocable Trust U/A Dated 12/21/2012"

An irrevocable trust is a legal arrangement where an owner transfers assets into a separate entity managed by a trustee and gives up the power to modify or reclaim those assets. For investors it matters because putting stock or other holdings into such a trust can change who controls and benefits from the assets, affect taxes and creditor protection, and influence how easy it is to sell or value those holdings—like placing valuables in a locked safe overseen by someone else.

open-market sale financial

"transaction_action: "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

non-derivative financial

"transaction_type: "non-derivative""

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Form 4 Insider Transactions: What Each Field Means →

06/02/2026 - 03:14 PM

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

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)
06/01/2026

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								167,125	I	See footnote⁽¹⁾
Common Stock	06/01/2026		S⁽²⁾		800	D	$313.0488⁽³⁾	8,807,290	D
Common Stock	06/01/2026		S⁽²⁾		800	D	$313.985⁽⁴⁾	8,806,490	D
Common Stock	06/01/2026		S⁽²⁾		1,200	D	$315.0625⁽⁵⁾	8,805,290	D
Common Stock	06/01/2026		S⁽²⁾		1,822	D	$316.2064⁽⁶⁾	8,803,468	D
Common Stock	06/01/2026		S⁽²⁾		900	D	$317.4252⁽⁷⁾	8,802,568	D
Common Stock	06/01/2026		S⁽²⁾		1,713	D	$318.5845⁽⁸⁾	8,800,855	D
Common Stock	06/01/2026		S⁽²⁾		700	D	$319.5029⁽⁹⁾	8,800,155	D
Common Stock	06/01/2026		S⁽²⁾		100	D	$320.16⁽¹⁰⁾	8,800,055	D
Common Stock	06/01/2026		S⁽²⁾		1,767	D	$321.9307⁽¹¹⁾	8,798,288	D
Common Stock	06/01/2026		S⁽²⁾		1,437	D	$323.2778⁽¹²⁾	8,796,851	D
Common Stock	06/01/2026		S⁽²⁾		1,598	D	$324.1038⁽¹³⁾	8,795,253	D
Common Stock	06/01/2026		S⁽²⁾		2,026	D	$325.1937⁽¹⁴⁾	8,793,227	D
Common Stock	06/01/2026		S⁽²⁾		1,100	D	$325.9797⁽¹⁵⁾	8,792,127	D
Common Stock	06/01/2026		S⁽²⁾		1,000	D	$327.216⁽¹⁶⁾	8,791,127	D
Common Stock	06/01/2026		S⁽²⁾		2,637	D	$328.5763⁽¹⁷⁾	8,788,490	D
Common Stock	06/01/2026		S⁽²⁾		400	D	$329.4225⁽¹⁸⁾	8,788,090	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 February 26, 2026.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $312.6400 to $313.3800. 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 (18) 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 $313.6400 to $314.5800.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $314.6500 to $315.4700.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $315.6900 to $316.6300.

7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $316.9600 to $317.6700.

8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $318.1000 to $318.9400.

9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $319.1400 to $320.1300.

10. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $320.1600 to $320.1600.

11. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $321.4500 to $322.3700.

12. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $322.5500 to $323.5300.

13. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $323.5600 to $324.5500.

14. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $324.6100 to $325.5500.

15. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $325.6800 to $326.5800.

16. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $326.9000 to $327.8600.

17. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $327.9800 to $328.9400.

18. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $329.3200 to $329.5400.

	/s/Quentin A. Fendelet Attorney in Fact for Patrizio Vinciarelli	06/02/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did VICR CEO Patrizio Vinciarelli report on June 1, 2026?

VICR CEO Patrizio Vinciarelli reported selling 20,000 shares of Vicor common stock on June 1, 2026. The transactions were open-market sales executed in multiple trades at weighted average prices within stated price ranges around the low to mid-$300s per share.

At what prices did VICR CEO Vinciarelli sell his 20,000 Vicor shares?

The 20,000 Vicor shares were sold at weighted average prices across several trades, with ranges from $312.6400 to $329.5400 per share. Each Form 4 line reflects an average price, with footnotes clarifying the detailed transaction price ranges within those bands.

How many Vicor (VICR) shares does the CEO hold after the reported sales?

After the reported sales, CEO Patrizio Vinciarelli directly holds 8,807,290 Vicor common shares. He also indirectly holds 167,125 additional shares as trustee of the Patrizio Vinciarelli Irrevocable Trust established for the benefit of his child, according to the Form 4 footnotes.

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

Yes. The filing states the sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2026. Such pre-arranged plans schedule trades in advance, reducing the significance of day-to-day market timing decisions by the insider.

Does the VICR Form 4 show any remaining derivative or option positions for the CEO?

The Form 4’s derivative summary is empty, indicating no derivative transactions such as options or convertible securities were reported in this filing. Only non-derivative common stock sales and an updated indirect holding as trustee of an irrevocable trust appear in the disclosed data.

What indirect Vicor (VICR) holdings does CEO Patrizio Vinciarelli report?

Vinciarelli reports indirect ownership of 167,125 Vicor shares held as trustee of the Patrizio Vinciarelli Irrevocable Trust U/A dated December 21, 2012. The trust was established for the benefit of his child, and these shares are reported separately from his direct holdings.