American Tower (AMT) EVP Ruth Dowling sells 656 shares under 10b5-1 plan

Rhea-AI Filing Summary

American Tower Corp (AMT) executive Ruth T. Dowling reported an open-market sale of 656 shares of common stock. The transaction took place on February 27, 2026 at an average price of $186.16 per share. After this sale, she directly held 31,729 shares of American Tower common stock. According to a footnote, the sale was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the reporting person, which is a pre-arranged program that allows insiders to sell shares over time under preset conditions.

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

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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)
02/27/2026

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	02/27/2026		S(1)		656	D	$186.16	31,729	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	03/03/2026
	** 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.
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FAQ

What insider transaction did AMT executive Ruth T. Dowling report?

Ruth T. Dowling reported selling 656 shares of American Tower common stock. The shares were sold on February 27, 2026 at an average price of $186.16 per share, as disclosed in a Form 4 insider trading report.

At what price did Ruth T. Dowling sell AMT shares in this Form 4 filing?

She sold 656 American Tower shares at an average price of $186.16 per share. This open-market transaction was reported as occurring on February 27, 2026 and involved common stock held directly.

How many AMT shares does Ruth T. Dowling hold after this reported sale?

After the reported sale, Ruth T. Dowling directly holds 31,729 American Tower common shares. This post-transaction holding figure comes from the Form 4, which details ownership both before and after the 656-share sale.

Was the AMT insider sale by Ruth T. Dowling under a Rule 10b5-1 plan?

Yes, the filing states the sale was effected under a Rule 10b5-1 trading plan. The plan was adopted by Ruth T. Dowling in advance, providing a preset framework for executing the 656-share sale on February 27, 2026.

What type of transaction is reported in Ruth T. Dowling’s AMT Form 4?

The Form 4 reports an open-market sale of common stock, coded “S” for sale. It describes a non-derivative transaction in which 656 American Tower shares were sold directly by the executive at $186.16 per share.