Capital Research Global Investors reports 7.1% stake in Allegro MicroSystems (ALGM)

Rhea-AI Filing Summary

Capital Research Global Investors, a division of Capital Research and Management Company and related investment management entities, reports beneficial ownership of 13,111,292 shares of Allegro MicroSystems, Inc. common stock.

This stake represents 7.1% of the 185,119,045 shares believed to be outstanding as of the reporting date. Capital Research Global Investors has sole power to vote and dispose of all 13,111,292 shares, with no shared voting or dispositive power reported.

The securities are stated to be held in the ordinary course of business and not for the purpose of changing or influencing control of Allegro MicroSystems, nor in connection with any transaction intended to have that effect.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)

Allegro MicroSystems, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

01749D105

(CUSIP Number)

12/31/2025

(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)

SCHEDULE 13G

CUSIP No. 01749D105

1

Names of Reporting Persons

Capital Research Global Investors

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 13,111,292.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 13,111,292.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

13,111,292.00

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)

7.1 %

12

Type of Reporting Person (See Instructions)

IA

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: Capital Research Global Investors
(b)	Address or principal business office or, if none, residence: 333 South Hope Street, 55th Fl, Los Angeles, CA 90071
(c)	Citizenship: N/A
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 01749D105
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: 13,111,292 ** **Capital Research Global Investors ("CRGI") is a division of Capital Research and Management Company ("CRMC"), as well as its investment management subsidiaries and affiliates Capital Bank and Trust Company, Capital International, Inc., Capital International Limited, Capital International Sarl, Capital International K.K., Capital Group Private Client Services, Inc., and Capital Group Investment Management Private Limited (together with CRMC, the "investment management entities"). CRGI's divisions of each of the investment management entities collectively provide investment management services under the name "Capital Research Global Investors." CRGI is deemed to be the beneficial owner of 13,111,292 shares or 7.1% of the 185,119,045 shares believed to be outstanding.
(b)	Percent of class: 7.1 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 13,111,292
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 13,111,292
	(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.
	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.
	Not Applicable
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.

Capital Research Global Investors

Signature:	Jae Won Chung
Name/Title:	Vice President and Senior Counsel II, Capital Research and Management Company
Date:	02/05/2026

FAQ

What ownership stake does Capital Research Global Investors report in Allegro MicroSystems (ALGM)?

Capital Research Global Investors reports beneficial ownership of 13,111,292 Allegro MicroSystems shares, representing 7.1% of 185,119,045 shares believed outstanding. This makes it a significant institutional holder with a notable minority stake in the company’s common stock.

Does Capital Research Global Investors control voting and disposal of its Allegro MicroSystems (ALGM) shares?

Yes. The filing states Capital Research Global Investors has sole voting power and sole dispositive power over 13,111,292 Allegro shares, with no shared voting or shared dispositive power. This means it alone decides how these shares are voted and whether they are sold.

Is Capital Research Global Investors filing as part of a group in Allegro MicroSystems (ALGM)?

No. The document indicates the usual group-related items as not applicable, and there is no identification of group members. The reported ownership is attributed to Capital Research Global Investors and its related investment management entities, not a broader shareholder group.

What percentage of Allegro MicroSystems (ALGM) common stock is held by Capital Research Global Investors?

Capital Research Global Investors is deemed to beneficially own 7.1% of Allegro MicroSystems’ common stock. This percentage is based on 13,111,292 shares held relative to 185,119,045 Allegro shares believed to be outstanding, as referenced in the ownership section.

Is Capital Research Global Investors seeking to influence control of Allegro MicroSystems (ALGM)?

No. The certification states the securities were acquired and are held in the ordinary course of business, not for changing or influencing control of Allegro. It also notes they are not held in connection with any transaction having that control-related purpose or effect.

Who signed the Allegro MicroSystems (ALGM) ownership report for Capital Research Global Investors?

The statement is signed by Jae Won Chung, identified as Vice President and Senior Counsel II of Capital Research and Management Company. The signature section certifies that, after reasonable inquiry, the information in the ownership report is true, complete, and correct.