JPMorgan Chase & Co. filed Amendment No. 4 to a Schedule 13G/A reporting beneficial ownership of 2,106,728 shares of Vicor Corporation common stock, representing 6.2% of the class. The filing lists sole voting power over 1,169,966 shares and sole dispositive power over 2,104,730 shares. Several JP Morgan entities are named as holders or custodians, including J.P. Morgan Trust Company of Delaware and J.P. Morgan Securities LLC. The form is signed by a JPMorgan officer on 05/04/2026.
Positive
None.
Negative
None.
Insights
JPMorgan reports a passive >5% stake in Vicor, typical institutional holding disclosure.
JPMorgan Chase & Co. reports beneficial ownership of 2,106,728 shares (6.2%), showing it crosses the 5% reporting threshold under Schedule 13G/A. The filing names multiple affiliated entities that may hold or exercise custodial functions.
There is no indication in the excerpt of an active intent to influence corporate control; this is a standard institutional ownership disclosure. Subsequent filings would show any change in voting intent or classification.
Key Figures
Beneficially owned:2,106,728 sharesPercent of class:6.2%Sole voting power:1,169,966 shares+2 more
5 metrics
Beneficially owned2,106,728 sharesreported on Schedule 13G/A (cover shows 03/31/2026)
Percent of class6.2%percentage of Vicor common stock reported in the amendment
Sole voting power1,169,966 sharesshares over which JPMorgan has sole voting power
Sole dispositive power2,104,730 sharesshares over which JPMorgan has sole dispositive power
Shared dispositive power1,998 sharesshares with shared dispositional authority per the filing
Key Terms
Schedule 13G/A, beneficially owned, sole dispositive power, shared voting power
4 terms
Schedule 13G/Aregulatory
"Amendment No. 4 to a Schedule 13G/A reporting beneficial ownership"
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 ownedfinancial
"Amount beneficially owned: 2106728"
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 powerregulatory
"Sole power to dispose or to direct the disposition of: 2104730"
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.
shared voting powerregulatory
"Shared Voting Power 8.00"
Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.
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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 4)
Vicor Corporation
(Name of Issuer)
Common Stock, par value $0.01 per share
(Title of Class of Securities)
925815102
(CUSIP Number)
03/31/2026
(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
1,169,966.00
6
Shared Voting Power
8.00
7
Sole Dispositive Power
2,104,730.00
8
Shared Dispositive Power
1,998.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
2,106,728.00
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)
6.2 %
12
Type of Reporting Person (See Instructions)
HC
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Vicor Corporation
(b)
Address of issuer's principal executive offices:
25 Frontage Road Andover MA 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:
2106728
(b)
Percent of class:
6.2 %
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
1169966
(ii) Shared power to vote or to direct the vote:
8
(iii) Sole power to dispose or to direct the disposition of:
2104730
(iv) Shared power to dispose or to direct the disposition of:
1998
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
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.
If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group.
Not Applicable
Item 9.
Notice of Dissolution of Group.
Notice of dissolution of a group may be furnished as an exhibit stating the date of the dissolution and that all further filings with respect to transactions in the security reported on will be filed, if required, by members of the group, in their individual capacity. See Item 5.
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.
What stake does JPMorgan (VICR) report in this Schedule 13G/A amendment?
JPMorgan reports beneficial ownership of 2,106,728 shares, equal to 6.2% of Vicor's common stock. The filing lists voting and dispositive power figures and identifies affiliated JP Morgan entities associated with the position.
Does the filing indicate JPMorgan seeks control of Vicor (VICR)?
No explicit control intent is stated in the excerpt; the filing lists voting and dispositive powers but does not assert an intent to influence control. It reads as an ownership disclosure under Schedule 13G/A rather than an acquisition for control.
Which JP Morgan entities are named in the Schedule 13G/A for VICR?
The filing identifies multiple affiliates, including J.P. Morgan Trust Company of Delaware, J.P. Morgan Securities LLC, JPMorgan Chase Bank, N.A., J.P. Morgan Investment Management Inc., JPMorgan Asset Management (Taiwan) Limited, and others as relevant holders or custodians.
What voting and dispositive powers does JPMorgan report for VICR shares?
The filing reports sole voting power for 1,169,966 shares and sole dispositive power for 2,104,730 shares, plus small amounts of shared voting and dispositional power as listed in the amendment.
When was the Schedule 13G/A amendment signed for VICR?
The amendment is signed by a JPMorgan officer, Rachel Tsvaygoft, on 05/04/2026, and the cover references a reporting date of 03/31/2026 for the holdings shown.
