Vicor (VICR) CEO sells 20,000 shares under Rule 10b5-1 plan

Rhea-AI Filing Summary

VICOR CORP Chairman and CEO Patrizio Vinciarelli reported selling 20,000 shares of Vicor common stock. The transactions occurred on June 4, 2026 as multiple open-market sales at prices reported in ranges from about $304.73 to $319.23 per share based on weighted averages.

Following these sales, he holds 8,746,490 shares directly and 167,125 shares indirectly as trustee of the Patrizio Vinciarelli Irrevocable Trust established for the benefit of his child. The filing notes that the sales were effected under a Rule 10b5-1 trading plan, indicating they were pre-arranged rather than discretionary market-timing trades.

Insights

Equity ownership & governance analyst

CEO sold 20,000 shares in pre-planned trades while retaining a large stake.

Patrizio Vinciarelli, Chairman, CEO and more than 10% owner of VICOR CORP, reported open-market sales totaling 20,000 common shares on June 4, 2026. Reported weighted-average sale prices span roughly $304.73 to $319.23 per share.

After these transactions, he still directly owns 8,746,490 shares and indirectly holds 167,125 shares as trustee of an irrevocable trust. This indicates the sale covers only a small fraction of his visible holdings in the company.

The filing states that the sales were executed under a Rule 10b5-1 trading plan adopted on February 26, 2026, meaning they were scheduled in advance. Such plans are commonly used to diversify or manage liquidity on a systematic basis, which generally reduces the informational value of the timing of these sales for investors.

Insider Trade Summary 10b5-1

Net Seller: 20,000 shares ($6,237,098)

Net Sell 13 txns

Insider VINCIARELLI PATRIZIO

Role Chairman and CEO

Sold 20,000 shs ($6.24M)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,600	$305.1506	$488K
Sale	Common Stock	1,673	$307.6911	$515K
Sale	Common Stock	3,200	$309.0794	$989K
Sale	Common Stock	1,863	$310.4686	$578K
Sale	Common Stock	2,762	$311.5272	$860K
Sale	Common Stock	1,337	$312.4534	$418K
Sale	Common Stock	1,265	$313.4425	$397K
Sale	Common Stock	2,000	$314.8296	$630K
Sale	Common Stock	1,900	$315.9445	$600K
Sale	Common Stock	1,600	$316.9819	$507K
Sale	Common Stock	400	$317.8225	$127K
Sale	Common Stock	400	$319.215	$128K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 8,746,490 shares (Direct, null); Common Stock — 167,125 shares (Indirect, See footnote)

Footnotes (1)

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 $304.7300 to $305.6400. 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 (14) 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 $307.4400 to $308.1500. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $308.6000 to $309.5100. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $309.9000 to $310.8300. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $310.9100 to $311.8900. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $311.9600 to $312.8800. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $313.0400 to $313.7400. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $314.3200 to $315.2300. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $315.3400 to $316.3000. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $316.4800 to $317.4200. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $317.4800 to $318.0000. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $319.2000 to $319.2300.

Key Figures

Shares sold: 20,000 shares Direct holdings after sale: 8,746,490 shares Indirect trust holdings: 167,125 shares +5 more

8 metrics

Shares sold 20,000 shares Total common stock sold on June 4, 2026

Direct holdings after sale 8,746,490 shares Common stock directly owned following transactions

Indirect trust holdings 167,125 shares Held as trustee of an irrevocable trust

Highest reported weighted-average price $319.23 per share Upper end of disclosed sale price ranges

Lowest reported weighted-average price $304.73 per share Lower end of disclosed sale price ranges

Number of sale entries 12 transactions Non-derivative open-market or private sales

10b5-1 plan adoption date February 26, 2026 Date CEO adopted Rule 10b5-1 trading plan

Holding entries 1 entry Indirect trust holding reported without share change

Key Terms

Rule 10b5-1 trading plan, weighted average price, open-market sale, irrevocable trust, +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 on February 26, 2026."

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.

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.

irrevocable trust financial

"Irrevocable Trust U/A Dated 12/21/2012, established for the benefit of the child"

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.

more than 10% owner regulatory

"is_ten_percent_owner: 1"

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Form 4 Insider Transactions: What Each Field Means →

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 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)
06/04/2026

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								167,125	I	See footnote(1)
Common Stock	06/04/2026		S(2)		1,600	D	$305.1506(3)	8,746,490	D
Common Stock	06/04/2026		S(2)		1,673	D	$307.6911(4)	8,744,817	D
Common Stock	06/04/2026		S(2)		3,200	D	$309.0794(5)	8,741,617	D
Common Stock	06/04/2026		S(2)		1,863	D	$310.4686(6)	8,739,754	D
Common Stock	06/04/2026		S(2)		2,762	D	$311.5272(7)	8,736,992	D
Common Stock	06/04/2026		S(2)		1,337	D	$312.4534(8)	8,735,655	D
Common Stock	06/04/2026		S(2)		1,265	D	$313.4425(9)	8,734,390	D
Common Stock	06/04/2026		S(2)		2,000	D	$314.8296(10)	8,732,390	D
Common Stock	06/04/2026		S(2)		1,900	D	$315.9445(11)	8,730,490	D
Common Stock	06/04/2026		S(2)		1,600	D	$316.9819(12)	8,728,890	D
Common Stock	06/04/2026		S(2)		400	D	$317.8225(13)	8,728,490	D
Common Stock	06/04/2026		S(2)		400	D	$319.215(14)	8,728,090	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)
				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 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 $304.7300 to $305.6400. 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 (14) 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 $307.4400 to $308.1500.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $308.6000 to $309.5100.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $309.9000 to $310.8300.

7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $310.9100 to $311.8900.

8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $311.9600 to $312.8800.

9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $313.0400 to $313.7400.

10. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $314.3200 to $315.2300.

11. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $315.3400 to $316.3000.

12. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $316.4800 to $317.4200.

13. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $317.4800 to $318.0000.

14. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $319.2000 to $319.2300.

	/s/Kemble D. Morrison Attorney in fact for Patrizio Vinciarelli	06/05/2026
	** 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 did Vicor (VICR) CEO Patrizio Vinciarelli report in this Form 4?

He reported selling 20,000 shares of Vicor common stock on June 4, 2026. The sales were broken into multiple open-market transactions at weighted-average prices between roughly $304.73 and $319.23 per share, according to the filing details.

At what prices did the Vicor (VICR) CEO sell his shares?

The Form 4 shows weighted-average sale prices ranging from about $304.73 to $319.23 per share. Footnotes explain each reported price reflects multiple trades within narrower ranges, and full price breakdowns are available upon request from the company or the SEC.

How many Vicor (VICR) shares does the CEO hold after these transactions?

After the reported sales, he directly owns 8,746,490 common shares of Vicor. In addition, he indirectly holds 167,125 shares as trustee of an irrevocable trust established for the benefit of his child, as described in the filing footnotes.

Were the Vicor (VICR) CEO’s share sales part of a Rule 10b5-1 plan?

Yes. A footnote states the sale was effected under a Rule 10b5-1 trading plan adopted on February 26, 2026. Such plans pre-schedule trades, indicating these sales were planned in advance rather than made in response to short-term market moves.

Does the Vicor (VICR) Form 4 include any indirect holdings by the CEO?

Yes. The filing notes 167,125 Vicor shares are held indirectly by the reporting person as trustee of the Patrizio Vinciarelli Irrevocable Trust dated December 21, 2012, which was established for the benefit of his child, clarifying the nature of those indirect holdings.

How many individual sale transactions are reported in this Vicor (VICR) Form 4?

The transaction summary shows 12 separate sale entries of Vicor common stock, totaling 20,000 shares sold. Each entry reflects an open-market or private sale, and several have footnoted weighted-average prices that aggregate multiple smaller trades within specified price ranges.