JPMorgan reports 1.56M VICOR shares (VICR) — 4.5% stake

Rhea-AI Filing Summary

JPMorgan Chase & Co. reports beneficial ownership of 1,556,989 shares of Vicor Corp common stock, representing 4.5% of the class. The filing discloses sole voting power for 1,493,706 shares and sole dispositive power for 1,554,842 shares. The report, signed June 4, 2026, lists several affiliated entities that hold or acquired the securities on behalf of the parent company.

Insights

Institutional Ownership Analyst

JPMorgan discloses a sub-5% stake with near-full dispositive control in Vicor.

JPMorgan Chase & affiliated entities report beneficial ownership of 1,556,989 shares (4.5%) as of the June 4, 2026 filing. The filing shows strong internal control: sole voting power of 1,493,706 shares and sole dispositive power of 1,554,842 shares.

Future trading by these affiliated accounts could affect free-float, but the filing itself is a passive ownership disclosure under a regulatory schedule and does not state any planned transactions.

Key Figures

Beneficial ownership: 1,556,989 shares Percent of class: 4.5% Sole voting power: 1,493,706 shares +3 more

6 metrics

Beneficial ownership 1,556,989 shares Schedule 13G/A; signed <date>06/04/2026</date>

Percent of class 4.5% Reported percent of Vicor common stock

Sole voting power 1,493,706 shares Amount with sole power to vote

Shared voting power 12 shares Amount with shared power to vote

Sole dispositive power 1,554,842 shares Amount with sole power to dispose

Shared dispositive power 1,980 shares Amount with shared power to dispose

Key Terms

Schedule 13G/A, beneficially owned, sole dispositive power, sole voting power

4 terms

Schedule 13G/A regulatory

"Item 1. (a) Name of issuer: VICOR CORP"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

beneficially owned regulatory

"Item 4. (a) Amount beneficially owned: 1,556,989"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole dispositive power regulatory

"Item 4. (c)(iii) Sole power to dispose or to direct the disposition of: 1,554,842"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

sole voting power regulatory

"Item 4. (c)(i) Sole power to vote or to direct the vote: 1,493,706"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 5)

VICOR CORP

(Name of Issuer)

Common Stock, par value $0.01 per share

(Title of Class of Securities)

925815102

(CUSIP Number)

05/29/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 925815102

1

Names of Reporting Persons

JPMORGAN CHASE & CO

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,493,706.00
6	Shared Voting Power 12.00
7	Sole Dispositive Power 1,554,842.00
8	Shared Dispositive Power 1,980.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,556,989.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.5 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: VICOR CORP
(b)	Address of issuer's principal executive offices: 25 FRONTAGE ROAD, ANDOVER, MASSACHUSETTS, 01810.
Item 2.
(a)	Name of person filing: JPMORGAN CHASE & CO
(b)	Address or principal business office or, if none, residence: 270 Park Avenue,,New York, NY 10017
(c)	Citizenship: DE
(d)	Title of class of securities: Common Stock, par value $0.01 per share
(e)	CUSIP No.: 925815102
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 1,556,989
(b)	Percent of class: 4.5 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1,493,706
	(ii) Shared power to vote or to direct the vote: 12
	(iii) Sole power to dispose or to direct the disposition of: 1,554,842
	(iv) Shared power to dispose or to direct the disposition of: 1,980
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. J.P. Morgan Trust Company of Delaware; J.P. Morgan Securities LLC; JPMorgan Chase Bank, National Association; J.P. Morgan Investment Management Inc.; JPMorgan Asset Management (Taiwan) Limited; JPMorgan Asset Management (China) Company Limited; J.P. Morgan Wealth Management Solutions Inc.
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

JPMORGAN CHASE & CO

Signature:	Rachel Tsvaygoft
Name/Title:	Vice President
Date:	06/04/2026

FAQ

What stake does JPMorgan report in VICR?

JPMorgan reports beneficial ownership of 1,556,989 shares, equal to 4.5% of Vicor Corp common stock, as shown in the Schedule 13G/A filing signed June 4, 2026.

How much voting power does JPMorgan hold in Vicor (VICR)?

The filing shows JPMorgan has sole voting power over 1,493,706 shares and shared voting power of 12 shares, per the ownership table in the Schedule 13G/A.

How many shares can JPMorgan dispose of in VICR?

JPMorgan reports sole dispositive power for 1,554,842 shares and shared dispositive power for 1,980 shares, indicating control over disposition of those amounts.

Which JPMorgan affiliates are named in the filing?

The filing names affiliates including J.P. Morgan Trust Company of Delaware, J.P. Morgan Securities LLC, JPMorgan Chase Bank, N.A., and several asset management entities as relevant subsidiaries.

Is JPMorgan a passive holder under this filing?

The Schedule 13G/A indicates ownership reporting rather than an active transaction; it lists beneficial ownership totals and power breakdowns but does not state an intent to acquire or dispose.