Vicor (VICR) director sells 38,587 shares in pre-set 10b5-1 stock plan

Rhea-AI Filing Summary

Vicor Corporation director Estia J. Eichten sold 38,587 shares of common stock in open-market trades on March 12, 2026, at weighted-average prices ranging from about $162.69 to $173.22. The transactions were executed under a pre-arranged Rule 10b5-1 trading plan, and Eichten now holds 190,838 shares directly.

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Equity markets analyst

Vicor director executes pre-planned sale of 38,587 shares, retains sizable stake.

Director Estia J. Eichten reported open-market sales totaling 38,587 shares of Vicor common stock on March 12, 2026. Trades occurred in multiple blocks at weighted-average prices from roughly $162.69 to $173.22, indicating execution across an intraday price range.

A footnote states the sales were made under a Rule 10b5-1 trading plan adopted on December 11, 2025. Such plans are pre-arranged, so the timing carries less informational value about management’s current view. After these sales, Eichten directly owns 190,838 shares, suggesting the transactions represent a partial, not complete, reduction in exposure.

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).

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^*

EICHTEN ESTIA J

(Last) (First) (Middle)

C/O VICOR CORPORATION

25 FRONTAGE RD.

(Street)

ANDOVER MA 01810

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
VICOR CORP [ VICR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
03/12/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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	03/12/2026		S(1)		976	D	$163.4129(2)	228,449	D
Common Stock	03/12/2026		S(1)		6,848	D	$164.4265(3)	221,601	D
Common Stock	03/12/2026		S(1)		2,876	D	$165.1307(4)	218,725	D
Common Stock	03/12/2026		S(1)		2,931	D	$166.4514(5)	215,794	D
Common Stock	03/12/2026		S(1)		2,846	D	$167.2804(6)	212,948	D
Common Stock	03/12/2026		S(1)		4,100	D	$168.3041(7)	208,848	D
Common Stock	03/12/2026		S(1)		5,610	D	$169.1456(8)	203,238	D
Common Stock	03/12/2026		S(1)		3,700	D	$170.3169(9)	199,538	D
Common Stock	03/12/2026		S(1)		3,400	D	$171.1076(10)	196,138	D
Common Stock	03/12/2026		S(1)		100	D	$172.15	196,038	D
Common Stock	03/12/2026		S(1)		5,200	D	$173.2013(11)	190,838	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

Explanation of Responses:

1. This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 11, 2025.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $162.6900 to $163.6800. 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 (2) through (11) to this Form 4.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $163.7900 to $164.7600.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $164.8200 to $165.8000.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $165.8200 to $166.7900.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $166.8200 to $167.8100.

7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $167.8200 to $168.8100.

8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $168.8200 to $169.8000.

9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $169.8700 to $170.8500.

10. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $170.8900 to $171.6300.

11. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $172.2500 to $173.2200.

	/s/Kemble D. Morrison. Attorney in fact for Estia J. Eichten	03/13/2026
	** 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.

FAQ

How many Vicor (VICR) shares did Estia J. Eichten sell in this Form 4?

Estia J. Eichten sold 38,587 shares of Vicor common stock in multiple open-market transactions on March 12, 2026. The trades were reported as separate blocks with different weighted-average prices but collectively reduce Eichten’s direct holdings to 190,838 shares after the transactions.

At what prices did Vicor (VICR) director Estia J. Eichten sell shares?

The reported weighted-average sale prices ranged from about $162.69 to $173.22 per share. Each line item reflects multiple trades within narrower ranges, with footnotes clarifying that detailed trade-by-trade pricing is available upon request from Vicor, its security holders, or SEC staff.

Was the Vicor (VICR) insider sale by Estia J. Eichten under a Rule 10b5-1 plan?

Yes. A footnote states the sale was effected under a Rule 10b5-1 trading plan adopted on December 11, 2025. Rule 10b5-1 plans are pre-arranged trading programs, which means the timing of these transactions was set in advance rather than decided opportunistically.

How many Vicor (VICR) shares does Estia J. Eichten own after the reported sales?

Following the reported open-market sales, Estia J. Eichten directly holds 190,838 shares of Vicor common stock. This figure comes from the post-transaction holdings column in the Form 4 and reflects Eichten’s remaining direct ownership after all March 12, 2026 trades.

What type of transactions did Vicor (VICR) director Estia J. Eichten report?

All reported transactions are open-market sales of common stock, coded “S” on the Form 4. The filing lists 11 non-derivative sale entries on March 12, 2026, with no option exercises, gifts, tax-withholding events, or derivative transactions reported in this particular filing.

Does the Vicor (VICR) Form 4 show any remaining stock options for Estia J. Eichten?

No remaining derivative positions are listed for Estia J. Eichten in this Form 4. The derivative section is empty, indicating no reported unexercised options or other derivative securities in this specific filing; only common stock holdings and sales are disclosed in the non-derivative table.