American Tower (AMT) EVP Ruth Dowling sells 682 shares under 10b5-1 plan

Rhea-AI Filing Summary

American Tower Corp. executive Ruth T. Dowling, EVP, Chief Administrative Officer, General Counsel and Secretary, sold 682 shares of Common Stock in an open-market transaction. The shares were sold at an average price of $188.51 per share. After this sale, she directly owned 31,047 shares of American Tower common stock. The transaction was executed under a pre-arranged Rule 10b5-1 trading plan adopted by the reporting person.

Insider Trade Summary

Net Seller: 682 shares ($128,564)

Net Sell 1 txn

Insider Dowling Ruth T

Role EVP, Chief Admin Ofr, GC & Sec

Sold 682 shs ($129K)

Type	Security	Shares	Price	Value
Sale	Common Stock	682	$188.51	$129K

Holdings After Transaction: Common Stock — 31,047 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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).

X

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^*

Dowling Ruth T

(Last) (First) (Middle)

222 BERKELEY STREET

(Street)

BOSTON MA 02116

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
AMERICAN TOWER CORP /MA/ [ AMT ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Chief Admin Ofr, GC & Sec

3. Date of Earliest Transaction (Month/Day/Year)
03/04/2026

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

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

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

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
Common Stock	03/04/2026		S(1)		682	D	$188.51	31,047	D

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

Explanation of Responses:

1. The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 29, 2025.

Remarks:

	/s/ Marina A. Breed, as attorney-in-fact	03/06/2026
	** 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.

FAQ

What insider transaction did AMT executive Ruth T. Dowling report on this Form 4?

Ruth T. Dowling reported selling 682 shares of American Tower common stock. The sale was an open-market transaction at an average price of $188.51 per share, reducing her direct holdings to 31,047 shares after the transaction.

At what price were the AMERICAN TOWER (AMT) shares sold in this Form 4 filing?

The reported sale of American Tower common stock was executed at an average price of $188.51 per share. This price applies to the 682 shares sold in the open-market transaction disclosed in the Form 4 by executive Ruth T. Dowling.

How many AMERICAN TOWER (AMT) shares does Ruth T. Dowling hold after the reported sale?

After the reported open-market sale, Ruth T. Dowling directly owns 31,047 shares of American Tower common stock. This figure reflects her direct ownership immediately following the 682-share disposition described in the Form 4 filing.

Was the AMERICAN TOWER (AMT) insider sale made under a Rule 10b5-1 plan?

Yes. The Form 4 states the sale was effected pursuant to a Rule 10b5-1 trading plan. The footnote explains that this pre-arranged plan was adopted by the reporting person, and the transaction was executed according to its terms.

What is the role of Ruth T. Dowling at AMERICAN TOWER (AMT) in this Form 4?

Ruth T. Dowling is identified as an officer of American Tower, serving as EVP, Chief Administrative Officer, General Counsel and Secretary. Her position is disclosed along with the insider sale of 682 shares of the company’s common stock.

How many AMERICAN TOWER (AMT) shares were sold in the reported insider transaction?

The Form 4 reports that 682 shares of American Tower common stock were sold. This was a non-derivative, open-market sale transaction, coded as an “S” transaction, and it decreased the reporting person’s direct holdings accordingly.