[Form 4] Affiliated Managers Group Insider Trading Activity

Rhea-AI Filing Summary

Tracy P. Palandjian, a director of Affiliated Managers Group, Inc. (AMG), reported the vesting of previously granted awards on 08/15/2025. The filing shows 1,117 stock units vested (reported as acquired at $0), increasing her reported direct common stock holdings to 17,886 shares. The report also shows 2,837 derivative units beneficially owned, inclusive of previously reported deferred stock units. The filing notes that the awards vest over 2022–2027. The form was signed by an attorney-in-fact on 08/18/2025.

Insights

Financial Analyst

TL;DR: Routine insider vesting reported; no cash purchase or sale, so limited immediate market impact.

This Form 4 documents the vesting of 1,117 stock units for Director Tracy Palandjian on 08/15/2025, recorded as acquired at $0 and increasing direct holdings to 17,886 shares. Vesting of equity compensation is a standard governance/compensation event and typically reflects long-term incentive delivery rather than a market trading decision. There is no evidence in this filing of a cash transaction, disposition, or new option exercise that would directly affect AMG's outstanding share count or liquidity.

Corporate Governance Expert

TL;DR: Disclosure aligns with Section 16 reporting; transaction appears routine and related to scheduled vesting.

The filing states the awards vest over 2022–2027 and that the reported units include previously deferred stock units. This indicates standard compensation plan mechanics rather than an ad hoc grant or sale. From a governance perspective, timely Form 4 reporting of vested awards maintains transparency about insider holdings and potential alignment with shareholder interests.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Palandjian Tracy P.

(Last) (First) (Middle)

C/O AFFILIATED MANAGERS GROUP, INC.

777 SOUTH FLAGLER DRIVE

(Street)

WEST PALM BEACH FL 33401

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
AFFILIATED MANAGERS GROUP, INC. [ AMG ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
08/15/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/15/2025		M		1,117	A	$0(1)	17,886	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Units	(1)	08/15/2025		M			1,117	(1)	(1)	Common Stock	1,117	$0	2,837(2)	D

Explanation of Responses:

1. Reflects the vesting of previously reported awards. Awards vest 2022-2027.

2. Inclusive of previously reported deferred stock units.

	/s/ Kavita Padiyar, Attorney-in-Fact	08/18/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What transaction did AMG director Tracy P. Palandjian report on Form 4?

The Form 4 reports the vesting and acquisition of 1,117 stock units on 08/15/2025, recorded at $0.

How many shares did Tracy Palandjian beneficially own after the reported transaction?

Following the reported transaction, Palandjian is shown as beneficially owning 17,886 shares of AMG common stock (direct).

Does the Form 4 show any sales or cash purchases by the reporting person?

No. The filing records a vesting event (acquisition at $0) and does not show any sales or cash purchases.

What is the nature and schedule of the awards mentioned in the filing?

The filing explains the entries reflect the vesting of previously reported awards that vest over 2022–2027 and include previously reported deferred stock units.

When was the Form 4 signed and filed?

The signature on the form by an attorney-in-fact is dated 08/18/2025; the reported transaction date is 08/15/2025.