Vicor (VICR) CEO Vinciarelli sells 20,000 shares in Rule 10b5-1 trades

Q: Were the May 28, 2026 VICR insider sales under a Rule 10b5-1 plan?

Yes, the sales were made under a Rule 10b5-1 trading plan. A footnote states the sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2026, indicating the transactions were pre-arranged rather than opportunistic.

Q: How many sale transactions did VICR’s CEO report on May 28, 2026?

The Form 4 shows 19 separate sale transactions that day. Each transaction involves Vicor Corporation common stock sold in the open market, with different weighted average prices and price ranges, collectively amounting to 20,000 shares sold on May 28, 2026.

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 20,000 shares of common stock on May 28, 2026. The sales were executed in 19 separate transactions at weighted average prices within ranges from about $328.10 to $350.43, as detailed in the filing.

The transactions were effected pursuant to a pre-arranged Rule 10b5-1 trading plan adopted on February 26, 2026. Following these sales, Vinciarelli directly holds 8,847,490 shares of VICOR CORP common stock and indirectly holds 167,125 shares as trustee of an irrevocable trust established for the benefit of his child.

Insider Trade Summary 10b5-1

Net Seller: 20,000 shares ($6,842,041)

Net Sell 20 txns

Insider VINCIARELLI PATRIZIO

Role Chairman and CEO

Sold 20,000 shs ($6.84M)

Type	Security	Shares	Price	Value
Sale	Common Stock	600	$328.3733	$197K
Sale	Common Stock	400	$330.25	$132K
Sale	Common Stock	900	$333.4761	$300K
Sale	Common Stock	700	$334.3086	$234K
Sale	Common Stock	420	$335.7637	$141K
Sale	Common Stock	1,303	$336.6774	$439K
Sale	Common Stock	477	$337.9609	$161K
Sale	Common Stock	1,000	$339.024	$339K
Sale	Common Stock	600	$340.2517	$204K
Sale	Common Stock	1,049	$341.3245	$358K
Sale	Common Stock	2,756	$342.4912	$944K
Sale	Common Stock	1,795	$343.1585	$616K
Sale	Common Stock	1,300	$344.4492	$448K
Sale	Common Stock	530	$345.531	$183K
Sale	Common Stock	1,670	$346.5091	$579K
Sale	Common Stock	1,700	$347.4478	$591K
Sale	Common Stock	2,400	$348.5783	$837K
Sale	Common Stock	200	$349.175	$70K
Sale	Common Stock	200	$350.42	$70K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 8,847,490 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 $328.1000 to $328.7100. 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 (21) 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 $330.1800 to $330.3800. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $332.7800 to $333.7500. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $333.7900 to $334.6800. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $335.2600 to $336.2100. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $336.2800 to $337.2400. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $337.4000 to $338.3300. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $338.5700 to $339.5400. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $339.6200 to $340.6100. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $340.7000 to $341.6800. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $341.7300 to $342.7200. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $342.7400 to $343.5200. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $344.0200 to $344.8600. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $345.0200 to $346.0100. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $346.0300 to $346.8750. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $347.0400 to $347.9800. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $348.0700 to $349.0200. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $349.1500 to $349.2000. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $350.4100 to $350.4300.

Key Figures

Shares sold: 20,000 shares Lowest price range: $328.10/share Highest price range: $350.43/share +3 more

6 metrics

Shares sold 20,000 shares Open-market sales on May 28, 2026

Lowest price range $328.10/share Footnote price range low for that day

Highest price range $350.43/share Footnote price range high for that day

Direct holdings after sale 8,847,490 shares Common stock held directly after May 28, 2026 trades

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

Sale transactions 19 transactions Number of open-market sale entries on May 28, 2026

Key Terms

Rule 10b5-1 trading plan, Irrevocable Trust U/A, weighted average price, open-market sale, +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 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.

Irrevocable Trust U/A financial

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

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.

indirect ownership financial

"ownership_type": "indirect""

Form 4 Insider Transactions: What Each Field Means →

05/29/2026 - 02:44 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)
05/28/2026

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	05/28/2026		S⁽²⁾		600	D	$328.3733⁽³⁾	8,847,490	D
Common Stock	05/28/2026		S⁽²⁾		400	D	$330.25⁽⁴⁾	8,847,090	D
Common Stock	05/28/2026		S⁽²⁾		900	D	$333.4761⁽⁵⁾	8,846,190	D
Common Stock	05/28/2026		S⁽²⁾		700	D	$334.3086⁽⁶⁾	8,845,490	D
Common Stock	05/28/2026		S⁽²⁾		420	D	$335.7637⁽⁷⁾	8,845,070	D
Common Stock	05/28/2026		S⁽²⁾		1,303	D	$336.6774⁽⁸⁾	8,843,767	D
Common Stock	05/28/2026		S⁽²⁾		477	D	$337.9609⁽⁹⁾	8,843,290	D
Common Stock	05/28/2026		S⁽²⁾		1,000	D	$339.024⁽¹⁰⁾	8,842,290	D
Common Stock	05/28/2026		S⁽²⁾		600	D	$340.2517⁽¹¹⁾	8,841,690	D
Common Stock	05/28/2026		S⁽²⁾		1,049	D	$341.3245⁽¹²⁾	8,840,641	D
Common Stock	05/28/2026		S⁽²⁾		2,756	D	$342.4912⁽¹³⁾	8,837,885	D
Common Stock	05/28/2026		S⁽²⁾		1,795	D	$343.1585⁽¹⁴⁾	8,836,090	D
Common Stock	05/28/2026		S⁽²⁾		1,300	D	$344.4492⁽¹⁵⁾	8,834,790	D
Common Stock	05/28/2026		S⁽²⁾		530	D	$345.531⁽¹⁶⁾	8,834,260	D
Common Stock	05/28/2026		S⁽²⁾		1,670	D	$346.5091⁽¹⁷⁾	8,832,590	D
Common Stock	05/28/2026		S⁽²⁾		1,700	D	$347.4478⁽¹⁸⁾	8,830,890	D
Common Stock	05/28/2026		S⁽²⁾		2,400	D	$348.5783⁽¹⁹⁾	8,828,490	D
Common Stock	05/28/2026		S⁽²⁾		200	D	$349.175⁽²⁰⁾	8,828,290	D
Common Stock	05/28/2026		S⁽²⁾		200	D	$350.42⁽²¹⁾	8,828,090	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 $328.1000 to $328.7100. 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 (21) 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 $330.1800 to $330.3800.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $332.7800 to $333.7500.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $333.7900 to $334.6800.

7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $335.2600 to $336.2100.

8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $336.2800 to $337.2400.

9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $337.4000 to $338.3300.

10. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $338.5700 to $339.5400.

11. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $339.6200 to $340.6100.

12. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $340.7000 to $341.6800.

13. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $341.7300 to $342.7200.

14. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $342.7400 to $343.5200.

15. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $344.0200 to $344.8600.

16. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $345.0200 to $346.0100.

17. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $346.0300 to $346.8750.

18. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $347.0400 to $347.9800.

19. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $348.0700 to $349.0200.

20. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $349.1500 to $349.2000.

21. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $350.4100 to $350.4300.

	/s/Quentin A. Fendelet Attorney in Fact for Patrizio Vinciarelli	05/29/2026
	** 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 Patrizio Vinciarelli report?

Patrizio Vinciarelli reported selling 20,000 VICR common shares. The Form 4 shows 19 open-market sale transactions on May 28, 2026, totaling 20,000 shares of Vicor Corporation common stock at various weighted average prices within specified intraday ranges.

At what prices did Patrizio Vinciarelli sell VICR shares on May 28, 2026?

The reported sales occurred between about $328.10 and $350.43 per share. Footnotes describe multiple weighted average sale prices, with individual trades executed in ranges spanning from $328.10 at the low end up to $350.43 at the high end that day.

How many VICR shares does Patrizio Vinciarelli own after the reported sales?

After the transactions, Vinciarelli directly holds 8,847,490 VICR shares. In addition, he indirectly holds 167,125 shares as trustee of the Patrizio Vinciarelli Irrevocable Trust U/A dated 12/21/2012, which was established for the benefit of his child.

Were the May 28, 2026 VICR insider sales under a Rule 10b5-1 plan?

Yes, the sales were made under a Rule 10b5-1 trading plan. A footnote states the sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2026, indicating the transactions were pre-arranged rather than opportunistic.

Does Patrizio Vinciarelli hold VICR shares indirectly through a trust?

Yes, he holds VICR shares indirectly as trustee of an irrevocable trust. The filing notes 167,125 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 his child.

How many sale transactions did VICR’s CEO report on May 28, 2026?

The Form 4 shows 19 separate sale transactions that day. Each transaction involves Vicor Corporation common stock sold in the open market, with different weighted average prices and price ranges, collectively amounting to 20,000 shares sold on May 28, 2026.