What does the trust-related indirect ownership in the VICR Form 4 represent?

The Form 4 explains that 171,125 Vicor shares are held by the reporting person as trustee of the Patrizio Vinciarelli Irrevocable Trust dated December 21, 2012. The trust was established for the benefit of his child, so these shares reflect indirect, trust‑held ownership.

Vicor (VICR) CEO Vinciarelli sells 19,778 shares, retains major stake

Filing Impact

(Very High)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

VICOR CORP Chairman and CEO Patrizio Vinciarelli reported open‑market sales of company stock. On April 14, 2026, he sold 9,778 shares of common stock at a weighted average price of $189.0000 per share and 10,000 shares at a weighted average price of $190.0005 per share.

After these sales, he directly holds 8,940,263 shares of Vicor common stock and has indirect ownership of 171,125 shares held in an irrevocable trust benefiting his child. The sales were executed under a pre‑arranged Rule 10b5‑1 trading plan adopted on November 3, 2025.

Insider Trade Summary 10b5-1

Net Seller: 19,778 shares ($3,748,047)

Net Sell 3 txns

Insider VINCIARELLI PATRIZIO

Role Chairman and CEO

Sold 19,778 shs ($3.75M)

Type	Security	Shares	Price	Value
Sale	Common Stock	9,778	$189.00	$1.85M
Sale	Common Stock	10,000	$190.0005	$1.90M
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 8,950,263 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 $189.0000 to $189.0000. 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 (4) 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 $190.0000 to $190.0100.

Key Figures

Shares sold (first trade): 9,778 shares Price (first trade): $189.0000 per share Shares sold (second trade): 10,000 shares +4 more

7 metrics

Shares sold (first trade) 9,778 shares Open-market sale of common stock at $189.0000 on April 14, 2026

Price (first trade) $189.0000 per share Weighted average sale price for 9,778 shares

Shares sold (second trade) 10,000 shares Open-market sale of common stock at $190.0005 on April 14, 2026

Price (second trade) $190.0005 per share Weighted average sale price for 10,000 shares

Total shares sold 19,778 shares Net shares sold across reported transactions

Direct holdings after sale 8,940,263 shares Vicor common stock directly owned by CEO after transactions

Indirect trust holdings 171,125 shares Shares held in Patrizio Vinciarelli Irrevocable Trust for his child

Key Terms

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

4 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."

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"

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.

Form 4 Insider Transactions: What Each Field Means →

04/15/2026 - 10:48 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

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)
04/14/2026

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	04/14/2026		S⁽²⁾		9,778	D	$189⁽³⁾	8,950,263	D
Common Stock	04/14/2026		S⁽²⁾		10,000	D	$190.0005⁽⁴⁾	8,940,263	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 $189.0000 to $189.0000. 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 (4) 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 $190.0000 to $190.0100.

	/s/Quentin A. Fendelet. Attorney in fact for Patrizio Vinciarelli	04/15/2026
	** 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 Chairman and CEO report on this Form 4?

The Form 4 shows that Chairman and CEO Patrizio Vinciarelli sold shares of Vicor common stock in the open market. He executed two separate transactions on April 14, 2026, disposing of a combined 19,778 shares at prices around $189 to $190 per share.

How many VICR shares did Patrizio Vinciarelli sell and at what prices?

He sold 9,778 Vicor common shares at a weighted average price of $189.0000 and an additional 10,000 shares at a weighted average price of $190.0005. Both transactions were reported as open‑market sales of non‑derivative common stock on April 14, 2026.

How many VICR shares does the CEO hold after these reported sales?

Following the reported transactions, Patrizio Vinciarelli directly owns 8,940,263 Vicor common shares. The filing also notes an indirect holding of 171,125 shares in an irrevocable trust for his child, where he serves as trustee, reflecting additional indirect economic exposure.

Were the VICR insider stock sales made under a Rule 10b5-1 trading plan?

Yes. A footnote states that the sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 3, 2025. Such pre‑arranged plans allow insiders to schedule sales in advance, reducing concerns about trade timing.