BlackRock reports 6.9% stake in Allegro MicroSystems

Rhea-AI Filing Summary

BlackRock, Inc. reports its beneficial ownership of common stock of Allegro MicroSystems, Inc. on an amended Schedule 13G. BlackRock and certain of its business units collectively beneficially own 12,814,040 shares of Allegro common stock, representing 6.9% of the outstanding class.

BlackRock has sole voting power over 12,469,786 shares and sole dispositive power over 12,814,040 shares, with no shared voting or dispositive power reported. Various underlying clients and investors have economic rights to dividends and sale proceeds, but no single person has more than five percent of Allegro’s outstanding common shares.

Key Figures

Beneficial Ownership: 12,814,040 shares Percent of Class: 6.9% Sole Voting Power: 12,469,786 shares +2 more

5 metrics

Beneficial Ownership 12,814,040 shares Common stock of Allegro MicroSystems beneficially owned by BlackRock business units

Percent of Class 6.9% Portion of Allegro MicroSystems outstanding common stock held by BlackRock

Sole Voting Power 12,469,786 shares Shares over which BlackRock has sole power to vote or direct the vote

Sole Dispositive Power 12,814,040 shares Shares over which BlackRock has sole power to dispose or direct disposition

Filing Date 07/27/2026 Date signed by Managing Director Spencer Fleming

Key Terms

beneficially owned, sole voting power, sole dispositive power, Schedule 13G, +1 more

5 terms

beneficially owned financial

"reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units"

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 voting power financial

"Sole Voting Power 12,469,786.00"

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.

sole dispositive power financial

"Sole Dispositive Power 12,814,040.00"

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.

Schedule 13G regulatory

"In accordance with SEC Release No. 34-39538 (January 12, 1998), this reflects the securities"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

parent holding company financial

"Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company"

FAQ

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

How many ALGM shares does BlackRock, Inc. report owning in this Schedule 13G/A?

BlackRock, Inc. reports beneficially owning 12,814,040 shares of Allegro MicroSystems, Inc. common stock. This position is disclosed as part of an amended Schedule 13G filing covering holdings by certain BlackRock business units.

What percentage of Allegro MicroSystems (ALGM) does BlackRock’s stake represent?

BlackRock’s reported holdings represent 6.9% of Allegro MicroSystems’ outstanding common stock. This percentage reflects the shares beneficially owned by specified BlackRock business units as described in the Schedule 13G/A.

What voting power does BlackRock report over ALGM shares?

BlackRock reports sole voting power over 12,469,786 Allegro MicroSystems shares and no shared voting power. This means only BlackRock’s reporting business units control how these shares are voted, according to the filing.

What dispositive power does BlackRock have over Allegro MicroSystems (ALGM) stock?

BlackRock reports sole dispositive power over 12,814,040 Allegro MicroSystems shares and no shared dispositive power. Sole dispositive power indicates BlackRock’s reporting units can direct the sale or other disposition of these shares.

Do any individual investors hold more than 5% of ALGM through BlackRock’s reported position?

The filing states that various persons have rights to dividends or sale proceeds from these ALGM shares, but no one person’s interest exceeds five percent of Allegro MicroSystems’ total outstanding common shares.

Which entity is the reporting person for this ALGM Schedule 13G/A amendment?

The reporting person is BlackRock, Inc., a Delaware corporation. The filing aggregates securities beneficially owned by specified BlackRock subsidiaries and affiliates, as allowed under SEC Release No. 34-39538.

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

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Available on EDGAR 07/27/2026 - 04:26 PM Accepted by SEC EDGAR 07/27/2026 - 04:25 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

ALLEGRO MICROSYSTEMS INC

(Name of Issuer)

Common Stock

(Title of Class of Securities)

01749D105

(CUSIP Number)

06/30/2026

(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): 01749D105

1

Names of Reporting Persons

BlackRock, Inc.

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 12,469,786.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 12,814,040.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

12,814,040.00

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)

6.9 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: ALLEGRO MICROSYSTEMS INC
(b)	Address of issuer's principal executive offices: 955 PERIMETER ROAD MANCHESTER NH 03103
Item 2.
(a)	Name of person filing: BlackRock, Inc. In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the "Reporting Business Units") of BlackRock, Inc. and its subsidiaries and affiliates. It does not include securities, if any, beneficially owned by other business units whose beneficial ownership of securities are disaggregated from that of the Reporting Business Units in accordance with such release.
(b)	Address or principal business office or, if none, residence: BlackRock, Inc., 50 Hudson Yards New York, NY 10001
(c)	Citizenship: See Item 4 of Cover Page
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 01749D105
Item 4.	Ownership
(a)	Amount beneficially owned: 12814040
(b)	Percent of class: 6.9 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 12469786
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 12814040
	(iv) Shared power to dispose or to direct the disposition of: 0
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. Various persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the common stock of ALLEGRO MICROSYSTEMS INC. No one person's interest in the common stock of ALLEGRO MICROSYSTEMS INC is more than five percent of the total outstanding common shares.
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. See Exhibit 99
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.

BlackRock, Inc.

Signature:	Spencer Fleming
Name/Title:	Managing Director
Date:	07/27/2026

Exhibit Information

Exhibit 24: Power of Attorney Exhibit 99: Item 7