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Affiliated Managers (NYSE: AMG) director gains 716 shares in award vesting

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(Neutral)
Form Type
4

Rhea-AI Filing Summary

For AFFILIATED MANAGERS GROUP, INC. (AMG), director Loren M. Starr reported the vesting and conversion of equity awards. On 2026-08-15, 716 Stock Units were exercised into 716 shares of Common Stock, reflecting the vesting of previously reported awards, inclusive of deferred stock units.

Following these transactions, Starr directly held 3,027 Stock Units and 2,653 shares of Common Stock.

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Insider STARR LOREN M
Role Director
Type Security Shares Price Value
Exercise Stock Units F1, F2 716 $0.00 $0.00
Exercise Common Stock F1 716 $0.00 $0.00
Holdings After Transaction: Stock Units — 3,027 shares (Direct); Common Stock — 2,653 shares (Direct)
Footnotes (2)
  1. F1. Reflects the vesting of previously reported awards. Awards vested in 2026.
  2. F2. Inclusive of previously reported deferred stock units.
Stock Units Exercised 716 shares Stock Units exercised and converted into Common Stock on 2026-08-15
Common Stock Acquired 716 shares Common Stock received upon exercise of Stock Units on 2026-08-15
Stock Units Held After 3,027 units Direct Stock Unit holdings following the vesting and exercise event
Common Shares Held After 2,653 shares Direct Common Stock holdings after the derivative exercise
Exercise Price per Share $0.0000 Reported transaction price per share for the 716-share exercise
Stock Units financial
"security_title: Stock Units"
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
"Inclusive of previously reported deferred stock units."
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.
derivative security financial
"Exercise or conversion of derivative security"
A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

FAQ

What insider transaction did AMG director Loren M. Starr report on this Form 4?

Loren M. Starr reported the vesting and exercise of 716 Stock Units into 716 shares of Common Stock for Affiliated Managers Group, Inc. (AMG) on 2026-08-15, related to previously reported equity awards.

How many AMG Stock Units vested or were exercised in Loren M. Starr’s recent Form 4?

The Form 4 shows that 716 Stock Units vested and were exercised into an equivalent number of 716 AMG common shares. The filing notes these reflect the vesting of previously reported awards that vested in 2026.

What are Loren M. Starr’s AMG common stock holdings after this Form 4 transaction?

After the reported transaction, Loren M. Starr directly held 2,653 shares of AMG Common Stock. These holdings reflect the addition of 716 shares received upon exercise of vested Stock Units on 2026-08-15.

How many AMG Stock Units does Loren M. Starr hold after the reported vesting?

Following the vesting transaction, Loren M. Starr held 3,027 Stock Units tied to AMG. A footnote explains this amount is inclusive of previously reported deferred stock units, indicating ongoing deferred equity-based compensation.

Does Loren M. Starr’s AMG Form 4 show open-market buying or selling of shares?

The Form 4 does not show open-market purchases or sales. It reports an exercise or conversion of derivative securities (Stock Units) into common stock as part of equity award vesting, with no per-share purchase or sale price involved.

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Learn about SEC filing dates
SEC Form 4
FORM 4UNITED 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)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/15/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock08/15/2026M716A$0(1)2,653D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Units(1)08/15/2026M716 (1) (1)Common Stock716$03,027(2)D
Explanation of Responses:
1. Reflects the vesting of previously reported awards. Awards vested in 2026.
2. Inclusive of previously reported deferred stock units.
/s/ Kavita Padiyar, Attorney-in-Fact08/18/2026
** Signature of Reporting PersonDate
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)