AMG (NYSE: AMG) CFO reports new stock units and tax share surrender

Rhea-AI Filing Summary

Affiliated Managers Group Chief Financial Officer Dava Ritchea reported equity compensation-related transactions on March 5, 2026. A previously reported stock unit award vested, converting 601 Stock Units into 601 shares of Common Stock at no cash exercise price.

To cover tax withholding obligations from this vesting, 292 shares of Common Stock were automatically surrendered to the company at $299.18 per share, leaving 309 Common shares directly owned after the tax withholding disposition. Following the conversion, Ritchea directly owned 1,804 Stock Units.

Ritchea also received a new grant of 1,667 Stock Units, issued under the company’s 2020 Equity Incentive Plan. This award vests in four equal installments on March 5 of each year from 2027 through 2030, aligning compensation with multi-year company performance.

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^*

RITCHEA DAVA

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial 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		601	A	$0(1)	601	D
Common Stock	03/05/2026		F		292(2)	D	$299.18	309	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)	03/05/2026		M			601	(1)	(1)	Common Stock	601	$0	1,804	D
Stock Units	(3)	03/05/2026		A		1,667		(3)	(3)	Common Stock	1,667	$0	1,667	D

Explanation of Responses:

1. Reflects the vesting of a previously reported award. Award vests 2026-2029.

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

3. 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 CFO Dava Ritchea report on this Form 4?

Dava Ritchea reported the vesting and conversion of 601 Stock Units into Common Stock, an automatic surrender of 292 Common shares to cover tax withholding, and a new grant of 1,667 Stock Units under Affiliated Managers Group’s 2020 Equity Incentive Plan.

How many AMG shares did the CFO surrender for taxes in this Form 4?

The CFO automatically surrendered 292 shares of Affiliated Managers Group Common Stock at $299.18 per share to satisfy tax withholding obligations related to the vesting of a prior stock unit award, as disclosed in the Form 4 footnotes.

What new equity award did the AMG CFO receive according to this filing?

The Form 4 shows a new grant of 1,667 Stock Units to the AMG CFO. This award was issued under the company’s 2020 Equity Incentive Plan and will vest in four equal installments on March 5 of 2027, 2028, 2029, and 2030.

When do the new AMG stock units granted to the CFO vest?

The 1,667 Stock Units granted to the CFO vest in four equal annual installments. Vesting dates are March 5, 2027, March 5, 2028, March 5, 2029, and March 5, 2030, as described in the Form 4 footnotes.

Did the AMG CFO buy or sell Common Stock on the open market in this Form 4?

The transactions involve equity award vesting, conversion of Stock Units into Common Stock, and an automatic share surrender for tax withholding. The filing does not describe any open-market purchases or sales, emphasizing compensation-related movements instead of discretionary trading.

How many stock units does the AMG CFO hold after these Form 4 transactions?

After the reported equity award activity, the Form 4 shows the CFO directly holding 1,804 Stock Units following the vesting-related conversion, and a separate new grant of 1,667 Stock Units that will vest between 2027 and 2030 under the 2020 Equity Incentive Plan.