[Form 4] Affiliated Managers Group Insider Trading Activity

Rhea-AI Filing Summary

Felix V. Matos Rodriguez, a director of Affiliated Managers Group (AMG), reported equity awards that vested on 08/15/2025. The filing shows 1,102 shares (stock units) were acquired through vesting at a $0 exercise/price and recorded as an acquisition. After the transaction, the report lists 4,502 shares beneficially owned in common stock and 2,039 stock units beneficially owned as derivative securities. The filing states these entries reflect the vesting of previously disclosed awards that vest between 2022 and 2027. The Form 4 was signed by an attorney-in-fact on behalf of the reporting person.

Positive

• Director increased equity holdings through vesting, aligning interests with shareholders
• Transaction appears routine (vesting of previously disclosed awards), indicating standard compensation execution

Negative

• None.

Insights

Corporate Governance Expert

TL;DR: Routine executive equity vesting by a director, consistent with standard retention and compensation practices.

The Form 4 documents the vesting of previously granted equity awards to a director, not an open-market trade. Such vesting transactions are common and serve as compensation and retention tools. The filing shows continued equity ownership, which aligns the director's interests with shareholders. There is no indication of unusual timing, related-party transfers, or disposition of shares; the transaction occurred via vesting with a $0 exercise price, consistent with restricted stock/unit awards.

Securities/Equity Analyst

TL;DR: Minor insider ownership increase from award vesting; not likely material to AMG's valuation.

The reported acquisition of 1,102 shares through vesting increases the director's direct and derivative holdings to modest levels (4,502 common shares and 2,039 stock units reported). The amounts are small relative to a public company’s outstanding shares and represent compensation realization rather than a market purchase or sale. No cash proceeds, sales, or exercises with payments are reported. Impact on float, control, or near-term share supply is negligible based on this filing alone.

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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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^*

Matos Rodriguez Felix V.

(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		1,102	A	$0(1)	4,502	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			1,102	(1)	(1)	Common Stock	1,102	$0	2,039	D

Explanation of Responses:

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

	/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 did AMG director Felix V. Matos Rodriguez report on Form 4?

The director reported the vesting and acquisition of 1,102 shares/stock units on 08/15/2025, reflected as vested awards at a $0 price.

How many AMG shares does the reporting person own after this transaction?

The Form 4 lists 4,502 common shares beneficially owned and 2,039 stock units (derivative) following the reported transaction.

Was cash exchanged for these shares in the reported transaction?

No cash was reported; the transaction shows a $0 price, indicating vesting of granted awards rather than a purchase.

Does this Form 4 indicate a sale of AMG shares by the director?

No. The filing reports an acquisition via vesting; there are no sales or dispositions noted.

Why did the awards vest on this date?

The filing states the entries reflect the vesting of previously reported awards with vesting schedules spanning 2022–2027.