Affiliated Managers director granted stock-based units

Affiliated Managers Group director Loren M. Starr reported two equity-related awards tied to the company’s common stock.

Rhea-AI Filing Summary

Affiliated Managers Group director Loren M. Starr reported two equity-related awards tied to the company’s common stock. On 2026-07-30, Starr received 411 stock units, each representing a right to receive one share of common stock, which vest in full on August 15, 2027. On the same date, Starr also acquired 210 deferred stock units, reflecting cash director fees elected to be deferred under the company’s deferred compensation plan; these units are notionally invested in a measurement fund tracking the common stock and become distributable in common stock upon Starr’s separation from service on the Board. Both positions are held as derivative securities with direct ownership.

Insider Trade Summary

Grant/Award: 621 shares

Grant/Award 2 txns

Insider STARR LOREN M

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Stock Units F1	411	$0.00	$0.00
Grant/Award	Deferred Stock Units F2	210	$0.00	$0.00

Holdings After Transaction: Stock Units — 411 contracts (Direct); Deferred Stock Units — 210 contracts (Direct)

Footnotes (2)

1. F1. Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in full on August 15, 2027.
2. F2. Reflects cash fees that the director has elected to defer under the Company's deferred compensation plan, which are notionally invested in a measurement fund tracking the Company's common stock during the deferral period. Each deferred stock unit is equal to one share of the Company's common stock, and becomes distributable in common stock upon the reporting person's separation from service as a member of the Board of Directors of the Company.

Key Figures

Stock units granted: 411 stock units Stock units vesting date: August 15, 2027 Deferred stock units from fees: 210 deferred stock units +2 more

5 metrics

Stock units granted 411 stock units Grant to Loren M. Starr on 2026-07-30; each unit equals one share upon vesting

Stock units vesting date August 15, 2027 Vesting date for the 411 stock units granted to Loren M. Starr

Deferred stock units from fees 210 deferred stock units Director cash fees deferred into units tracking AMG common stock

Stock units held after grant 411.0000 units Total stock units directly owned by Loren M. Starr after the transaction

Deferred units held after grant 210.0000 units Total deferred stock units directly owned by Loren M. Starr after the transaction

Key Terms

Stock Units, Deferred Stock Units, deferred compensation plan, measurement fund, +1 more

5 terms

Stock Units financial

"Each stock unit represents a right to receive one share of the Company's common stock"

Stock units are individual pieces of ownership in a company, like slices of a pie that together make up the whole business. They matter to investors because each unit represents a claim on the company’s assets, profits and sometimes voting power, and changes in the number or value of these units affect ownership percentages, potential dividends and share dilution — all of which influence an investment’s worth.

Deferred Stock Units financial

"Reflects cash fees that the director has elected to defer under the Company's deferred compensation plan"

Deferred stock units are promises from a company to give an employee shares of stock at a future date, often after certain conditions are met or after leaving the company. They function like a form of delayed compensation, allowing employees to earn shares over time. For investors, they represent potential future ownership in the company, but do not provide immediate voting rights or dividends until the shares are actually received.

deferred compensation plan financial

"the director has elected to defer under the Company's deferred compensation plan, which are notionally invested"

A deferred compensation plan is an arrangement where an employer agrees to pay part of an employee’s pay or bonus at a later date instead of immediately, often to reduce current tax bills or to tie rewards to long-term performance. For investors it matters because these promises create future cash obligations and influence executive incentives and retention; they can affect a company’s reported liabilities, cash flow planning and the risk profile if the business faces financial trouble.

measurement fund financial

"notionally invested in a measurement fund tracking the Company's common stock during the deferral period"

separation from service financial

"becomes distributable in common stock upon the reporting person's separation from service as a member"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What equity awards did AMG director Loren M. Starr report on this Form 4?

Loren M. Starr reported acquiring 411 stock units and 210 deferred stock units tied to Affiliated Managers Group common stock. The stock units vest in 2027, while the deferred stock units represent deferred cash director fees payable in stock at Board service separation.

When do Loren M. Starr’s 411 AMG stock units vest?

The 411 stock units granted to Loren M. Starr vest in full on August 15, 2027. Each stock unit represents a right to receive one share of Affiliated Managers Group common stock upon vesting, increasing Starr’s potential future equity holdings if the vesting condition is met.

What are the 210 deferred stock units reported by AMG director Loren M. Starr?

The 210 deferred stock units reflect director cash fees that Starr elected to defer under AMG’s deferred compensation plan. These units are notionally invested in a measurement fund tracking AMG common stock and will be distributed in common stock when Starr leaves the Board.

How are Loren M. Starr’s AMG stock units and deferred stock units linked to common stock?

Each of the 411 stock units and 210 deferred stock units equals one share of Affiliated Managers Group common stock. The stock units convert upon vesting in 2027, while the deferred stock units convert and distribute when Starr separates from Board service.

Were there any open-market purchases or sales of AMG stock by Loren M. Starr?

No open-market purchases or sales were reported; both transactions are grant/award acquisitions of stock-based units. The filing shows awards of stock units and deferred stock units, rather than buys or sells of existing Affiliated Managers Group common shares.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/03/2026 - 05:11 PM Accepted by SEC EDGAR 08/03/2026 - 05:10 PM Learn about SEC filing dates

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
Estimated average burden
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^*

STARR LOREN M

(Last) (First) (Middle)

C/O AFFILIATED MANAGERS GROUP, INC.

1001 U.S. HIGHWAY ONE NORTH

(Street)

JUPITER FLORIDA 33477

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/30/2026

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

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

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

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

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)	07/30/2026		A		411		(1)	(1)	Common Stock	411	$0	411	D
Deferred Stock Units	(2)	07/30/2026		A		210		(2)	(2)	Common Stock	210	$0	210	D

Explanation of Responses:

1. Each stock unit represents a right to receive one share of the Company's common stock upon vesting. The stock units vest in full on August 15, 2027.

2. Reflects cash fees that the director has elected to defer under the Company's deferred compensation plan, which are notionally invested in a measurement fund tracking the Company's common stock during the deferral period. Each deferred stock unit is equal to one share of the Company's common stock, and becomes distributable in common stock upon the reporting person's separation from service as a member of the Board of Directors of the Company.

	/s/ Kavita Padiyar, Attorney-in-Fact	08/03/2026
	** 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.
* Form 4: SEC 1474 (03-26)