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Vicor (NASDAQ: VICR) CEO Vinciarelli sells 8,760 shares under 10b5-1 plan

Filing Impact
(Very High)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

VICOR CORP Chairman & CEO Patrizio Vinciarelli sold Common Stock in a series of open-market transactions. On June 29, 2026, he sold a total of 8,760 shares of VICR at weighted average prices mostly in the high-$360s per share under a pre-arranged Rule 10b5-1 trading plan. After these sales, he continues to directly hold more than 8.4 million shares of Vicor common stock, indicating the trades represent a small portion of his overall stake.

Positive

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Insights

CEO executes pre-planned sale of 8,760 VICR shares, retains large stake.

Patrizio Vinciarelli, Chairman, CEO and over-10% owner of VICOR CORP, conducted open-market sales totaling 8,760 Common Stock shares on June 29, 2026. Reported weighted average prices were in the upper $360s per share.

The filing notes the sales were effected under a Rule 10b5-1 trading plan adopted on February 26, 2026, indicating these trades were pre-scheduled rather than opportunistic. Such plans are commonly used for orderly diversification and to reduce concerns about trade timing.

Following these transactions, Vinciarelli still directly owns more than 8.4 million shares, so the sale represents only a small fraction of his visible holdings. With no derivative exercises or tax-related dispositions reported, this appears to be a routine, pre-planned reduction of a large position rather than a transformative ownership change.

Insider VINCIARELLI PATRIZIO
Role Chairman & CEO
Sold 8,760 shs ($3.21M)
Type Security Shares Price Value
Sale Common Stock 2,560 $365.5195 $936K
Sale Common Stock 2,700 $366.7095 $990K
Sale Common Stock 1,200 $367.6209 $441K
Sale Common Stock 2,100 $368.5005 $774K
Sale Common Stock 200 $369.335 $74K
Holdings After Transaction: Common Stock — 8,414,290 shares (Direct, null)
Footnotes (1)
  1. 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 $364.9800 and $365.9400. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $366.0100 and $366.9400. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $367.0700 and $368.0100. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $368.0900 and $368.9900. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $369.1100 and $369.5600.
Total shares sold 8,760 shares Open-market sales of Common Stock on June 29, 2026
Block sale 1 average price $369.3350/share Weighted average price for 200 shares sold
Block sale 2 average price $368.5005/share Weighted average price for 2,100 shares sold
Block sale 3 average price $367.6209/share Weighted average price for 1,200 shares sold
Block sale 4 average price $366.7095/share Weighted average price for 2,700 shares sold
Block sale 5 average price $365.5195/share Weighted average price for 2,560 shares sold
Post-sale holdings (approx.) over 8.4M shares CEO’s direct ownership after reported transactions
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.
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""
Common Stock financial
"security_title: "Common Stock""
Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.
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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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)
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)
XDirectorX10% Owner
XOfficer (give title below)Other (specify below)
Chairman & CEO
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/29/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock06/29/2026S(1)2,560D$365.5195(2)8,414,290D
Common Stock06/29/2026S(1)2,700D$366.7095(3)8,411,590D
Common Stock06/29/2026S(1)1,200D$367.6209(4)8,410,390D
Common Stock06/29/2026S(1)2,100D$368.5005(5)8,408,290D
Common Stock06/29/2026S(1)200D$369.335(6)8,408,090D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2026.
2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $364.9800 and $365.9400.
3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $366.0100 and $366.9400.
4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $367.0700 and $368.0100.
5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $368.0900 and $368.9900.
6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $369.1100 and $369.5600.
/s/Quentin A. Fendelet Attorney in Fact for Patrizio Vinciarelli06/30/2026
** Signature of Reporting PersonDate
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

How many VICOR CORP (VICR) shares did the CEO sell in this Form 4?

The CEO, Patrizio Vinciarelli, sold a total of 8,760 shares of Vicor Common Stock. The sales occurred in several open-market transactions on June 29, 2026, at weighted average prices in the high-$360s per share, according to the Form 4 filing.

At what prices did Patrizio Vinciarelli sell VICR shares in this transaction?

The reported weighted average sale prices ranged around the high $360s per share, including transactions at approximately $369.3350 and $365.5195. Footnotes explain that each reported price reflects multiple trades executed within narrow price ranges on June 29, 2026.

Was the VICOR CORP CEO’s sale of shares under a Rule 10b5-1 plan?

Yes. A footnote states the sale was effected pursuant to a Rule 10b5-1 trading plan adopted by Patrizio Vinciarelli on February 26, 2026. Such plans pre-schedule trades, reducing the significance of trade timing as an indicator of insider sentiment.

How many VICOR CORP shares does the CEO hold after this Form 4 sale?

After the June 29, 2026 sales, the Form 4 shows Patrizio Vinciarelli still directly owns over 8.4 million shares of Vicor common stock. This indicates the 8,760 shares sold represent a small portion of his total disclosed holdings.

What type of transactions are reported in this VICR Form 4 filing?

All reported transactions are non-derivative open-market sales of Vicor Common Stock, coded as “S” in the filing. There are no associated option exercises, tax-withholding dispositions, gifts, or derivative transactions disclosed in this particular Form 4.