Vanguard (AMG) disaggregates holdings; reports 0 shares in AMG after realignment

Rhea-AI Filing Summary

Affiliated Managers Group Inc ownership filing: The Vanguard Group amended its Schedule 13G to report 0 shares beneficially owned and 0% of the class. The amendment states Vanguard implemented an internal realignment and certain subsidiaries will report ownership separately in reliance on SEC Release No. 34-39538.

The filing is administrative and reflects disaggregation of holdings under the cited SEC release rather than an active purchase or sale.

Insights

Institutional Ownership Specialist

Vanguard reports zero beneficial ownership after internal reorganization.

The amendment states 0 shares and 0% ownership, citing an internal realignment and separate reporting by subsidiaries under SEC Release No. 34-39538. This is an administrative disaggregation of prior aggregated reporting.

Cash-flow treatment is not discussed. Subsequent filings by Vanguard subsidiaries may list holdings separately as indicated.

Regulatory Compliance Analyst

Filing follows an SEC-sanctioned disaggregation process, not a market transaction.

The notice references SEC Release No. 34-39538 and specifies that certain Vanguard subsidiaries now report beneficial ownership independently. The statement aligns with compliance guidance for reorganizations of reporting responsibilities.

Monitor future amendments for per-subsidiary 13G/A entries that will disclose any actual holdings.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 14)

Affiliated Managers Group Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

(CUSIP Number)

03/13/2026

(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 No.

1

Names of Reporting Persons

The Vanguard Group

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

PENNSYLVANIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: On January 12, 2026, The Vanguard Group, Inc. went through an internal realignment. In accordance with SEC Release No. 34-39538 (January 12, 1998), certain subsidiaries or business divisions of subsidiaries of The Vanguard Group, Inc., that formerly had, or were deemed to have, beneficial ownership with The Vanguard Group, Inc., will report beneficial ownership separately (on a disaggregated basis) from The Vanguard Group, Inc. in reliance on such release. These subsidiaries and/or business divisions pursue the same investment strategies as previously pursued by The Vanguard Group, Inc. prior to the realignment. Further in accordance with SEC Release No. 34-39538 (January 12, 1998), The Vanguard Group, Inc. no longer has, or is deemed to have, beneficial ownership over securities beneficially owned by such subsidiaries and/or business divisions.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Affiliated Managers Group Inc
(b)	Address of issuer's principal executive offices: 600 Hale Street, Prides Crossing, MA, 01965
Item 2.
(a)	Name of person filing: The Vanguard Group
(b)	Address or principal business office or, if none, residence: 100 Vanguard Blvd.,, Malvern, PA, 19355
(c)	Citizenship: PA
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.:
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: 0
(b)	Percent of class: 0 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 0
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.
	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. The Vanguard Group, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein.No one other person's interest in the securities reported herein is more than 5%.
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.

The Vanguard Group

Signature:	Ashley Grim
Name/Title:	Head of Global Fund Administration
Date:	03/26/2026

FAQ

What does the AMG 13G/A amendment from Vanguard mean?

It means Vanguard reports 0 shares and 0% beneficial ownership after an internal realignment. The filing explains Vanguard disaggregated holdings so certain subsidiaries will report separately under SEC Release No. 34-39538, shifting reporting responsibility rather than indicating a sale or purchase.

Does the amendment indicate Vanguard sold AMG shares?

No, the amendment does not state any sale or purchase of AMG shares. It explains an internal reorganization and separate reporting by subsidiaries under SEC Release No. 34-39538, which changes how beneficial ownership is reported but does not itself describe market transactions.

Who signed the Schedule 13G/A for AMG and when?

The Schedule 13G/A was signed by Ashley Grim, Head of Global Fund Administration, on 03/26/2026. The signature accompanies the amendment that reports 0 shares and cites the internal realignment explanation in the certification language.

Why does the filing cite SEC Release No. 34-39538?

The filing cites SEC Release No. 34-39538 to justify reporting on a disaggregated basis by subsidiaries. That release permits separate reporting when a parent reorganizes and subsidiaries assume beneficial ownership reporting responsibilities, which is the stated basis here.

Will AMG investors see Vanguard holdings restored in future filings?

Possibly; the amendment indicates subsidiaries will report their holdings separately going forward. Future Schedule 13G/A or 13D filings by Vanguard subsidiaries may disclose any AMG positions previously aggregated under Vanguard's filings.