American Tower (AMT) EVP Dowling awarded 11,083 performance-based shares

Rhea-AI Filing Summary

American Tower executive Ruth T. Dowling acquired 11,083 shares of Common Stock at no cost through earned performance-based restricted stock units. The award reflects PSUs earned after a three-year performance period from a grant made on March 10, 2023, and will vest three years from that grant date.

After this acquisition, Dowling directly owns 32,385 shares, which includes 40 shares previously acquired under American Tower's employee stock purchase plan in November 2025.

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).

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)
02/25/2026

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	02/25/2026		A		11,083(1)	A	$0	32,385(2)	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. Reflects the number of performance-based restricted stock units ("PSUs") earned, as a result of the Compensation and Human Capital Committee's certification to the achievement of performance based on a three-year performance period, under the terms of a PSU award granted on March 10, 2023. These shares will vest three years from the grant date of such PSU award, and each PSU represents a contingent right to receive one share of Common Stock.

2. Includes 40 shares acquired under the issuer's employee stock purchase plan in November 2025.

Remarks:

	/s/ Marina A. Breed, as attorney-in-fact	02/27/2026
	** 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 AMERICAN TOWER (AMT) report for Ruth T. Dowling?

AMERICAN TOWER reported that executive Ruth T. Dowling acquired 11,083 shares of Common Stock at no cost. The shares came from performance-based restricted stock units earned after a three-year performance period tied to a grant made on March 10, 2023.

How were the 11,083 American Tower (AMT) shares earned by Ruth T. Dowling?

The 11,083 shares reflect performance-based restricted stock units earned following the Compensation and Human Capital Committee’s certification of performance. They relate to a PSU award granted on March 10, 2023, based on a three-year performance period defined under that award’s terms.

When will Ruth T. Dowling’s newly earned AMT performance-based shares vest?

These performance-based shares will vest three years from the grant date of the PSU award made on March 10, 2023. Until vesting, each PSU represents a contingent right to receive one share of AMERICAN TOWER Common Stock, subject to the award’s conditions.

What is Ruth T. Dowling’s total American Tower (AMT) share ownership after this Form 4?

Following this transaction, Ruth T. Dowling directly owns 32,385 shares of AMERICAN TOWER Common Stock. This total includes the 11,083 shares acquired via earned PSUs and 40 shares previously acquired under the company’s employee stock purchase plan in November 2025.

What role does Ruth T. Dowling hold at AMERICAN TOWER (AMT)?

Ruth T. Dowling serves as Executive Vice President, Chief Administrative Officer, General Counsel, and Secretary at AMERICAN TOWER. Her Form 4 filing reflects equity compensation tied to company performance, aligning her interests with shareholders through performance-based restricted stock units.