American Tower officer proposes $290K share sale

A separate past-three-months entry lists 1,106 shares sold for $193,505.76 on July 29, 2026.

Rhea-AI Filing Summary

American Tower Corporation (AMT) officer Ruth T. Dowling gave notice of a proposed sale of 1,578 common shares, with an aggregate market value of $290,083.74. Morgan Stanley Smith Barney LLC is listed as broker, and the table gives October 28, 2026, as the approximate sale date. Dowling acquired the shares upon vesting of restricted stock units from March 10, 2023, through March 10, 2025.

Key Figures

Proposed shares for sale: 1,578 shares Aggregate market value: $290,083.74 Shares outstanding: 463,763,555 shares +2 more

5 metrics

Proposed shares for sale 1,578 shares Ruth T. Dowling's proposed sale

Aggregate market value $290,083.74 Proposed common-share sale

Shares outstanding 463,763,555 shares Issuer figure listed with the proposed sale

Shares sold 1,106 shares July 29, 2026; listed under “10b5-1 Sales for Ruth T. Dowling”

Reported value of prior sale $193,505.76 1,106 shares sold on July 29, 2026

Key Terms

Restricted Stock Units, 10b5-1 Sales

2 terms

Restricted Stock Units financial

"acquired upon the vesting of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

10b5-1 Sales regulatory

"10b5-1 Sales for RUTH T DOWLING"

10b5-1 sales are pre-arranged stock-trading plans that let company insiders automatically buy or sell shares according to a fixed schedule or formula, even if they later learn confidential information. Think of it as setting up an automatic thermostat for trades: it creates a clear, documented path that can protect insiders from insider-trading accusations and gives investors a signal about predictable insider activity—though it can also simply be a way for insiders to diversify or raise cash.

FAQ

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

How many AMT shares is Ruth T. Dowling proposing to sell?

Ruth T. Dowling gave notice of a proposed sale of 1,578 AMT common shares, with an aggregate market value of $290,083.74. The table lists October 28, 2026, as the approximate sale date.

How many AMT shares did Ruth T. Dowling sell in the prior three months?

The past-three-months entry lists 1,106 AMT common shares sold on July 29, 2026, for $193,505.76. It labels the sales “10b5-1 Sales for Ruth T. Dowling.”

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

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Available on EDGAR 10/28/2026 - 04:19 PM EDT Accepted by SEC EDGAR 10/28/2026 - 04:18 PM EDT Learn about SEC filing dates

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	0001960785
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	AMERICAN TOWER CORPORATION
SEC File Number	001-14195
Address of Issuer	222 Berkeley Street Boston MASSACHUSETTS 02116
Phone	6173757500
Name of Person for Whose Account the Securities are To Be Sold	RUTH T DOWLING
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	Officer

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	1578	290083.74	463763555	10/28/2026	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	03/10/2023	Restricted Stock Units	Issuer			1578	03/10/2023	N/A

* 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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for RUTH T DOWLING 222 Berkeley Street Boston MA 02116	Common	07/29/2026	1106	193505.76

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon the vesting of restricted stock units during the period of 03/10/2023 through 03/10/2025.
Date of Notice	10/28/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	10/29/2025
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	/s/ Ruth T Dowling
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)