[144] American Tower Corporation SEC Filing

Rhea-AI Filing Summary

American Tower Corp. (AMT) filed a Form 144 indicating a proposed sale of 720 common shares (approx. value $149,996) through Morgan Stanley Smith Barney on the NYSE around 31 Jul 2025. The shares were originally received as restricted stock on 3 Jan 2024. No other insider sales were reported within the last three months, and the filing states the seller is unaware of undisclosed adverse information.

The planned sale represents less than 0.0002 % of AMT’s 468.3 million shares outstanding and therefore appears immaterial to overall float and market perception. Form 144 is a routine notice and does not obligate the seller to complete the transaction.

Insights

Financial Analyst

TL;DR: Small, routine Form 144—720 shares (~$150K) vs. 468 M outstanding; minimal market impact.

This notice signals an insider’s intent, not certainty, to sell 720 AMT shares worth about $150K. Given the negligible 0.0002 % float impact and absence of additional insider activity, the filing is procedurally routine. No valuation-relevant details (earnings, guidance, strategic shifts) are disclosed, so investors should view it as neutral housekeeping rather than a directional signal.

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	720	149996.16	468251225	07/31/2025	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	01/03/2024	Restricted Stock	Issuer			720	01/03/2024	Not Applicable

* 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

How many AMT shares are insiders planning to sell per this Form 144?

The filing covers 720 common shares with an estimated value of $149,996.

What percentage of American Tower’s shares does the 720-share sale represent?

It equals about 0.0002 % of the 468.3 million shares outstanding—an immaterial amount.

When is the anticipated sale date for the AMT shares?

The filer lists an approximate sale date of 31 July 2025.

Were any other AMT insider sales reported in the past three months?

No. The form states "Nothing to Report" for prior-three-month insider sales.

What was the source of the shares being sold?

The 720 shares were acquired as restricted stock on 3 Jan 2024 from the issuer.