Vicor VP Fendelet sells 5,059 shares after exercise

VICOR CORP corporate VP and CAO Quentin A. Fendelet reported an exercise-and-sell transaction in company stock.

Rhea-AI Filing Summary

VICOR CORP corporate VP and CAO Quentin A. Fendelet reported an exercise-and-sell transaction in company stock. On May 11, 2026, he exercised non-qualified stock options covering a total of 5,059 shares of common stock at exercise prices of $33.96 and $41.61 per share.

On the same date, he sold 5,059 shares of VICOR CORP common stock in multiple open-market transactions at weighted average prices ranging from about $290.00 to $301.97 per share, as detailed in the footnotes. Following these sales, his directly owned common stock position reported in this filing was 0 shares.

Insider Trade Summary

Exercise and Sale: 5,059 shares ($1.33M approx. pre-tax spread)

Exercise and Sale 13 txns

Insider Fendelet Quentin A.

Role Corp. VP - CAO

Sold 5,059 shs ($1.50M)

Approx. gross sale proceeds $1.50M

Approx. exercise cost $173K

Approx. pre-tax spread $1.33M

Type	Security	Shares	Price	Value
Exercise	Non Qualified Stock Option	4,963	$0.00	$0.00
Exercise	Non Qualified Stock Option	96	$0.00	$0.00
Exercise	Common Stock	4,963	$33.96	$169K
Exercise	Common Stock	96	$41.61	$4K
Sale	Common Stock	700	$290.0057	$203K
Sale	Common Stock	262	$291.4403	$76K
Sale	Common Stock	238	$292.6635	$70K
Sale	Common Stock	497	$293.634	$146K
Sale	Common Stock	100	$295.00	$30K
Sale	Common Stock	533	$297.5394	$159K
Sale	Common Stock	200	$299.445	$60K
Sale	Common Stock	1,930	$300.1263	$579K
Sale	Common Stock	599	$301.3427	$181K

Holdings After Transaction: Non Qualified Stock Option — 19,418 contracts (Direct); Common Stock — 0 shares (Direct)

Footnotes (9)

1. F1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $290.0000 to $290.0400.
2. F2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $291.0000 to $291.7900.
3. F3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $292.0000 to $292.9900.
4. F4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $293.5000 to $293.9700.
5. F5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $295.0000 to $295.0000.
6. F6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $297.3700 to $297.8000.
7. F7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $299.0000 to $299.8900.
8. F8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $300.0000 to $300.4900.
9. F9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $301.0000 to $301.9700.

Key Figures

Shares sold: 5,059 shares Sale price range: $290.00–$301.97/share Options exercised at $33.96: 4,963 shares at $33.96/share +3 more

6 metrics

Shares sold 5,059 shares Total common shares sold on May 11, 2026

Sale price range $290.00–$301.97/share Weighted average sale price ranges from footnotes

Options exercised at $33.96 4,963 shares at $33.96/share Non-qualified stock option exercise price

Options exercised at $41.61 96 shares at $41.61/share Non-qualified stock option exercise price

Net buy/sell shares -5,059 shares Net share change from transaction summary

Post-transaction common shares 0 shares Direct common stock holdings after sales

Key Terms

Non Qualified Stock Option, open-market sale, derivative exercise/conversion, weighted average price, +1 more

5 terms

Non Qualified Stock Option financial

"security_title: "Non Qualified Stock Option""

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.

derivative exercise/conversion financial

"transaction_action: "derivative exercise/conversion""

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.

Non-derivative security financial

"transaction_type: "non-derivative" for common stock entries"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transactions did VICOR (VICR) report for Quentin A. Fendelet?

Quentin A. Fendelet, VICOR’s corporate VP and CAO, exercised options for 5,059 common shares and sold 5,059 shares in open-market transactions on May 11, 2026, fully offsetting the exercised shares.

How many VICOR (VICR) shares did Quentin A. Fendelet sell and at what prices?

He sold 5,059 VICOR common shares in several open-market trades at weighted average prices generally between about $290.00 and $301.97 per share, with specific price ranges disclosed in the footnotes.

What stock options did Quentin A. Fendelet exercise in the VICOR (VICR) Form 4?

He exercised non-qualified stock options for 4,963 shares at an exercise price of $33.96 per share and 96 shares at an exercise price of $41.61 per share, converting these options into VICOR common stock.

What was Quentin A. Fendelet’s VICOR (VICR) common stock holding after the reported transactions?

After completing the May 11, 2026 transactions, the Form 4 shows Quentin A. Fendelet directly holding 0 shares of VICOR common stock, reflecting that the exercised shares were fully sold that day.

Were Quentin A. Fendelet’s VICOR (VICR) share sales single trades or multiple trades?

The Form 4 footnotes state that each reported sale price is a weighted average. The shares were sold in multiple transactions within specified price ranges around each reported average price on May 11, 2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/12/2026 - 12:11 PM Learn about SEC filing dates

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^*

Fendelet Quentin A.

(Last) (First) (Middle)

25 FRONTAGE RD.

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Corp. VP - CAO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/11/2026

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	05/11/2026		M		4,963	A	$33.96	4,963	D
Common Stock	05/11/2026		M		96	A	$41.61	5,059	D
Common Stock	05/11/2026		S		700	D	$290.0057(1)	4,359	D
Common Stock	05/11/2026		S		262	D	$291.4403(2)	4,097	D
Common Stock	05/11/2026		S		238	D	$292.6635(3)	3,859	D
Common Stock	05/11/2026		S		497	D	$293.634(4)	3,362	D
Common Stock	05/11/2026		S		100	D	$295(5)	3,262	D
Common Stock	05/11/2026		S		533	D	$297.5394(6)	2,729	D
Common Stock	05/11/2026		S		200	D	$299.445(7)	2,529	D
Common Stock	05/11/2026		S		1,930	D	$300.1263(8)	599	D
Common Stock	05/11/2026		S		599	D	$301.3427(9)	0	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
Non Qualified Stock Option	$33.96	05/11/2026		M			4,963	05/03/2026	05/03/2028	Common Stock	4,963	$0	14,889	D
Non Qualified Stock Option	$41.61	05/11/2026		M			96	05/02/2026	05/02/2028	Common Stock	96	$0	4,529	D

Explanation of Responses:

1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $290.0000 to $290.0400.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $291.0000 to $291.7900.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $292.0000 to $292.9900.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $293.5000 to $293.9700.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $295.0000 to $295.0000.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $297.3700 to $297.8000.

7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $299.0000 to $299.8900.

8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $300.0000 to $300.4900.

9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $301.0000 to $301.9700.

	/s/ Kemble D. Morrison Attorney in Fact for Quentin A. Fendelet	05/12/2026
	** 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)