American Tower's Ruth T. Dowling sells 1,578 shares

Both reported sales were made under a Rule 10b5-1 trading plan adopted on October 29, 2025.

Available on EDGAR 10/30/2026 - 04:47 PM EDT Accepted by SEC EDGAR 10/30/2026 - 04:46 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

American Tower executive officer Ruth T. Dowling, whose title is EVP, Chief Admin Ofr, GC & Sec, sold 626 shares at $182 per share on October 28, 2026, and 952 shares at $185.81 per share on October 29, 2026. The two sales totaled 1,578 shares. Both were made under a Rule 10b5-1 trading plan adopted on October 29, 2025.

Insider Trade Summary 10b5-1

Net Seller: 1,578 shares

Net Sell 2 txns

Insider Dowling Ruth T

Role EVP, Chief Admin Ofr, GC & Sec

Sold 1,578 shs ($291K)

Share of Position Sold 5.7%

Type	Security	Shares	Price	Value
Sale	Common Stock F1	952	$185.81	$177K
Sale	Common Stock F1	626	$182.00	$114K

Holdings After Transaction: Common Stock — 26,133 shares (Direct)

Holdings Before and After: Common Stock, 27,711 to 26,133 shares (Direct)

Footnotes (1)

1. F1. 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.

Key Figures

Shares sold: 626 shares Price per share: $182 Shares sold: 952 shares +2 more

5 metrics

Shares sold 626 shares Sale on October 28, 2026

Price per share $182 Sale on October 28, 2026

Shares sold 952 shares Sale on October 29, 2026

Price per share $185.81 Sale on October 29, 2026

Shares sold across both transactions 1,578 shares October 28 and October 29, 2026

Key Terms

Rule 10b5-1 trading plan, non-derivative, price per share

3 terms

Rule 10b5-1 trading plan regulatory

"pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

non-derivative technical

"non-derivative Common Stock"

price per share financial

"transaction price per share"

FAQ

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

How many AMT shares did Ruth T. Dowling sell, and at what prices?

Ruth T. Dowling sold 1,578 shares: 626 shares at $182 per share on October 28, 2026, and 952 shares at $185.81 per share on October 29, 2026. Both sales were made under a Rule 10b5-1 trading plan adopted on October 29, 2025.

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

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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 MASSACHUSETTS 02116

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/28/2026

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

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

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

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	10/28/2026		S(1)		626	D	$182	27,085	D
Common Stock	10/29/2026		S(1)		952	D	$185.81	26,133	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	10/30/2026
	** 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.
* Form 4: SEC 1474 (03-26)