CEO Jay Horgen logs AMG (NYSE: AMG) stock grants and tax share surrender

Rhea-AI Filing Summary

AFFILIATED MANAGERS GROUP, INC. Chief Executive Officer Jay C. Horgen reported multiple equity compensation transactions on March 5, 2026. Previously granted stock units vested and were exercised, converting 17,563 stock units into 17,563 shares of common stock at a stated price of $0.00 per share.

Horgen also received new awards of 8,544 stock units and a separate grant of 27,260 shares of common stock, both at a stated price of $0.00, reflecting equity incentives under company plans. To satisfy tax withholding obligations tied to these vestings, 18,333 shares of common stock were automatically surrendered to the company at $299.18 per share.

After these transactions, Horgen directly owned 336,877 shares of common stock and held additional indirect positions of 34,058 shares through family trusts and 200,000 shares through a grantor retained annuity trust, as disclosed in the filing footnotes.

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

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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^*

Horgen Jay C.

(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
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/05/2026

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	03/05/2026		M		17,563	A	$0(1)	327,950(2)	D
Common Stock	03/05/2026		A		27,260	A	$0(3)	355,210	D
Common Stock	03/05/2026		F		18,333(4)	D	$299.18	336,877	D
Common Stock								34,058	I	By Family Trusts
Common Stock								200,000(2)	I	By GRAT

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)	03/05/2026		M			17,563	(1)	(1)	Common Stock	17,563	$0	22,891	D
Stock Units	(5)	03/05/2026		A		8,544		(5)	(5)	Common Stock	8,544	$0	8,544	D

Explanation of Responses:

1. Reflects the vesting of previously reported awards. Awards vest 2023-2029.

2. Reflects the transfer of 200,000 shares of common stock to a grantor retained annuity trust.

3. Award granted in March 2023, which settled following the achievement of performance conditions previously described in the Company's annual meeting proxy statements.

4. Reflects the automatic surrender of shares of common stock to the Company to satisfy tax withholding obligations related to the vesting of the awards described above.

5. The award, issued under the Company's 2020 Equity Incentive Plan, vests in four equal installments on each of March 5, 2027, 2028, 2029, and 2030.

	/s/ Kavita Padiyar, Attorney-in-Fact	03/09/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transactions did AMG CEO Jay C. Horgen report on this Form 4?

Jay C. Horgen reported vesting and exercise of 17,563 stock units, new grants of 8,544 stock units and 27,260 common shares, and an automatic surrender of 18,333 shares to cover tax withholding obligations related to these equity awards.

Did AMG CEO Jay C. Horgen buy or sell AMG common stock in the open market?

The filing shows no open-market buys or sells. Activity includes equity award vesting, exercises at $0.00, new stock and unit grants, and a tax-withholding share surrender of 18,333 shares at $299.18 per share back to the company.

How many AMG common shares does Jay C. Horgen own directly after these transactions?

Following the reported transactions, Jay C. Horgen directly owns 336,877 shares of AMG common stock. This figure reflects the conversion of vested stock units, new stock grants, and the automatic surrender of shares to satisfy tax withholding obligations on those awards.

What new equity awards did AMG grant to CEO Jay C. Horgen?

Horgen received 8,544 stock units and a separate grant of 27,260 shares of common stock, each at a stated price of $0.00 per share. Footnotes indicate awards vest in installments between 2027 and 2030 under the 2020 Equity Incentive Plan.

Why were 18,333 AMG shares surrendered by Jay C. Horgen, and at what price?

The Form 4 states 18,333 shares of AMG common stock were automatically surrendered to the company at $299.18 per share. A footnote explains this satisfied tax withholding obligations arising from the vesting of previously granted equity awards.

What indirect AMG share holdings related to Jay C. Horgen are disclosed?

The filing discloses 34,058 AMG common shares held indirectly through family trusts and 200,000 shares held indirectly through a grantor retained annuity trust. A footnote notes the 200,000-share position reflects a transfer of common stock to that trust.