How significant are the CEO’s share sales relative to his Vicor (VICR) holdings?

The filing shows 50,000 shares were sold while 8,895,090 shares remain directly owned, plus 171,125 shares indirectly held through a trust. This means the reported disposals represent a relatively small fraction of his overall economic interest as presented in this single Form 4.

Vicor (VICR) CEO Vinciarelli sells 50,000 shares but keeps major stake

Filing Impact

(Very High)

Filing Sentiment

(Very Negative)

Form Type

Rhea-AI Filing Summary

Vicor Corp Chairman and CEO Patrizio Vinciarelli reported open‑market sales of 50,000 shares of common stock. The trades on April 15, 2026 were executed in five blocks at weighted average prices between $191.1206 and $195.0000 per share.

After these transactions, he directly holds 8,895,090 shares of Vicor common stock and has an additional 171,125 shares held indirectly as trustee of an irrevocable trust established for his child. The filing notes the sales were made under a pre‑arranged Rule 10b5‑1 trading plan.

Insights

CEO sold 50,000 shares under a pre-set Rule 10b5-1 plan while retaining a very large stake.

Patrizio Vinciarelli, Vicor’s Chairman, CEO and 10% owner, executed open‑market sales totaling 50,000 shares of common stock on April 15, 2026. Prices ranged from about $191.12 to $195.00 per share across five trade blocks.

Following these sales, he still directly owns 8,895,090 shares, plus 171,125 shares held indirectly as trustee of an irrevocable trust for his child. This indicates the disposals are small relative to his overall position, which remains substantial.

The filing states the sales were made under a Rule 10b5‑1 trading plan adopted on November 3, 2025. Such plans are pre‑arranged and executed automatically, so the timing of these trades typically reflects pre‑planned diversification or liquidity rather than a new view on Vicor’s prospects.

Insider Trade Summary 10b5-1

Net Seller: 50,000 shares ($9,660,511)

Net Sell 6 txns

Insider VINCIARELLI PATRIZIO

Role Chairman and CEO

Sold 50,000 shs ($9.66M)

Type	Security	Shares	Price	Value
Sale	Common Stock	7,213	$191.1206	$1.38M
Sale	Common Stock	11,287	$192.1992	$2.17M
Sale	Common Stock	10,300	$193.185	$1.99M
Sale	Common Stock	11,200	$194.00	$2.17M
Sale	Common Stock	10,000	$195.00	$1.95M
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 8,937,877 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 $191.0000 to $191.9800. 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 (7) 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 $192.0000 to $192.9100. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $193.0000 to $193.9300. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $194.0000 to $194.0000. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $195.0000 to $195.0000.

Key Figures

Shares sold: 50,000 shares Sale prices: $191.1206–$195.0000 per share Direct holdings after sale: 8,895,090 shares +3 more

6 metrics

Shares sold 50,000 shares Total common shares sold on April 15, 2026

Sale prices $191.1206–$195.0000 per share Weighted average prices for the five sale blocks

Direct holdings after sale 8,895,090 shares Common stock directly owned following transactions

Indirect trust holdings 171,125 shares Shares held as trustee of irrevocable trust for child

Largest sale block 11,287 shares Sold at a weighted average price of $192.1992

Earliest reported price $191.1206 per share Weighted average price for 7,213-share block

Key Terms

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

5 terms

Rule 10b5-1 trading plan financial

"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. These shares were sold in multiple transactions"

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

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

beneficial ownership financial

"established for the benefit of the child of the reporting person"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

Form 4 Insider Transactions: What Each Field Means →

04/16/2026 - 02:05 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)
04/15/2026

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	04/15/2026		S⁽²⁾		7,213	D	$191.1206⁽³⁾	8,937,877	D
Common Stock	04/15/2026		S⁽²⁾		11,287	D	$192.1992⁽⁴⁾	8,926,590	D
Common Stock	04/15/2026		S⁽²⁾		10,300	D	$193.185⁽⁵⁾	8,916,290	D
Common Stock	04/15/2026		S⁽²⁾		11,200	D	$194⁽⁶⁾	8,905,090	D
Common Stock	04/15/2026		S⁽²⁾		10,000	D	$195⁽⁷⁾	8,895,090	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 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 $191.0000 to $191.9800. 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 (7) 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 $192.0000 to $192.9100.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $193.0000 to $193.9300.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $194.0000 to $194.0000.

7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $195.0000 to $195.0000.

	/s/Kemble D. Morrison Attorney in fact for Patrizio Vinciarelli	04/16/2026
	** 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 did Vicor (VICR) CEO Patrizio Vinciarelli report in this Form 4?

He reported selling 50,000 shares of Vicor common stock in open-market transactions. The sales occurred on April 15, 2026, across five trade blocks at weighted average prices between $191.1206 and $195.0000 per share, according to the Form 4 filing.

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

The reported weighted average sale prices ranged from $191.1206 to $195.0000 per share. Individual blocks were priced at $191.1206, $192.1992, $193.1850, $194.0000, and $195.0000, reflecting multiple trades executed within narrow price bands on the same trading day.

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

After the reported sales, Patrizio Vinciarelli directly owns 8,895,090 shares of Vicor common stock. The Form 4 also shows an additional 171,125 shares held indirectly, where he serves as trustee of an irrevocable trust established for the benefit of his child.

Were the Vicor (VICR) CEO’s stock sales made under a Rule 10b5-1 plan?

Yes. A footnote explains the April 15, 2026 sales were effected under a Rule 10b5-1 trading plan. The plan was adopted on November 3, 2025, indicating these transactions were pre-arranged and executed automatically according to preset instructions rather than discretionary timing.

What does the trust holding in the Vicor (VICR) Form 4 represent?

The Form 4 notes 171,125 shares are held by the reporting person as trustee of the Patrizio Vinciarelli Irrevocable Trust. This trust was established under an agreement dated December 21, 2012 for the benefit of his child, reflecting indirect beneficial ownership separate from his direct holdings.