Affiliated Managers Group (AMG) Notice: 16,000-Share Sale via Morgan Stanley

Rhea-AI Filing Summary

Form 144 filed for Affiliated Managers Group (AMG) proposes the sale of 16,000 common shares through Morgan Stanley Smith Barney on the NYSE with an approximate sale date of 09/09/2025. The filing reports an aggregate market value of $3,696,454.40 and notes 28,412,063 shares outstanding. The shares were acquired on 09/09/2025 through an exercise of options under a registered plan and payment was made in cash. The filer indicates there were no securities sold by the person in the past 3 months and signs the required representation that they are not aware of undisclosed material adverse information about the issuer.

Positive

• Acquisition under a registered plan is disclosed, showing the transaction follows a formal compensation/exercise mechanism
• No securities sold in the past three months by the person for whose account the securities are to be sold

Negative

• Proposed sale of 16,000 common shares with an aggregate market value of $3,696,454.40
• Sale scheduled for 09/09/2025, indicating immediate disposition following exercise

Insights

Securities Analyst

TL;DR: Routine Rule 144 notice for immediately post-exercise sale; provides factual disclosure of quantity, value, and acquisition method.

The filing documents a proposed sale of 16,000 AMG common shares with an aggregate market value of $3,696,454.40, scheduled for 09/09/2025, executed through Morgan Stanley Smith Barney on the NYSE. The shares were acquired the same day via exercise of options under a registered plan and paid in cash; the filer reports no sales in the prior three months. From a trading-disclosure standpoint this is a standard compliance filing that notifies the market of a planned restricted/insider sale under Rule 144.

Corporate Governance Expert

TL;DR: Filing reflects adherence to disclosure rules and a trading plan execution; no indication of undisclosed material information.

The notice includes the required representation that the filer is unaware of any material nonpublic information. The acquisition via option exercise under a registered plan and immediate proposed sale are documented, and the absence of prior sales in the past three months is noted. This filing is procedural transparency consistent with governance and insider-trading disclosure expectations.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	16000	3696454.40	28412063	09/09/2025	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/09/2025	Exercise of options under a registered plan	Issuer			16000	09/09/2025	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks

Date of Notice

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the AMG Form 144 disclose about the proposed sale?

The filing discloses a proposed sale of 16,000 AMG common shares on the NYSE through Morgan Stanley Smith Barney with an approximate sale date of 09/09/2025.

How much is the proposed sale worth according to the filing?

The aggregate market value reported is $3,696,454.40 for the 16,000 shares.

How were the shares acquired for the sale reported in the Form 144?

The shares were acquired on 09/09/2025 by exercise of options under a registered plan and payment was made in cash.

Did the filer report other sales in the past three months?

The filing states Nothing to Report for securities sold during the past three months by the person for whose account the securities are to be sold.

Does the filing state whether the filer knows of any undisclosed material information?

The filer represents by signing the notice that they do not know any material adverse information about the issuer that has not been publicly disclosed.