Were Ruth T. Dowling’s AMT share sales under a Rule 10b5-1 plan?

Yes. The Form 4 footnote states the sale was effected under a Rule 10b5-1 trading plan adopted on October 29, 2025. Such plans pre-schedule trades, making the timing more routine.

American Tower (NYSE: AMT) EVP Dowling sells 972 shares under 10b5-1 plan

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

Ruth T. Dowling reported selling a total of 972 AMT common shares in open-market transactions. The sales were split between two days and are detailed in a Form 4 insider filing for American Tower.

Q: On what dates did Ruth T. Dowling sell AMT (AMT) shares?

Ruth T. Dowling sold AMT shares on April 28, 2026 and April 29, 2026 . These trades are reported as separate open-market sales of common stock in the Form 4 filing.

Q: At what prices were the AMT shares sold by Ruth T. Dowling?

Dowling sold 556 shares at $178.48 per share on April 28, 2026, and 416 shares at $177.54 per share on April 29, 2026. Both are reported as open-market sales of American Tower common stock.

Q: How many AMT shares does Ruth T. Dowling hold after these sales?

After the reported sales, Ruth T. Dowling directly holds 29,461 shares of American Tower common stock. This post-transaction holding is disclosed in the Form 4 as her direct ownership position.

Q: What type of transaction code is used for Ruth T. Dowling’s AMT sales?

Both transactions use code “S” , which the Form 4 describes as a sale in open market or private transaction . This indicates routine open-market sales of American Tower common stock.

Filing Impact

(Moderate)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

American Tower executive Ruth T. Dowling, EVP, Chief Administrative Officer, General Counsel and Secretary, reported selling a total of 972 shares of Common Stock of AMT in two open-market transactions.

The sales occurred at prices around $178 per share under a pre-arranged Rule 10b5-1 trading plan, and she now directly holds 29,461 shares after these trades.

Insider Trade Summary 10b5-1

Net Seller: 972 shares ($173,092)

Net Sell 2 txns

Insider Dowling Ruth T

Role EVP, Chief Admin Ofr, GC & Sec

Sold 972 shs ($173K)

Type	Security	Shares	Price	Value
Sale	Common Stock	416	$177.54	$74K
Sale	Common Stock	556	$178.48	$99K

Holdings After Transaction: Common Stock — 29,461 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold April 28, 2026: 556 shares at $178.48 Shares sold April 29, 2026: 416 shares at $177.54 Total shares sold: 972 shares +2 more

5 metrics

Shares sold April 28, 2026 556 shares at $178.48 Open-market sale of AMT Common Stock

Shares sold April 29, 2026 416 shares at $177.54 Open-market sale of AMT Common Stock

Total shares sold 972 shares Aggregate of two Form 4 sale transactions

Shares held after transactions 29,461 shares Direct ownership after reported sales

Transaction code S Sale in open market or private transaction

Key Terms

Rule 10b5-1 trading plan, open-market sale, Common Stock, Form 4

4 terms

Rule 10b5-1 trading plan financial

"The sale reported on this Form 4 was effected 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.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Common Stock financial

""security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 regulatory

"The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan..."

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Form 4 Insider Transactions: What Each Field Means →

04/30/2026 - 04:16 PM

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).

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)
04/28/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	04/28/2026		S⁽¹⁾		556	D	$178.48	29,877	D
Common Stock	04/29/2026		S⁽¹⁾		416	D	$177.54	29,461	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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	04/30/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

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

Ruth T. Dowling reported selling a total of 972 AMT common shares in open-market transactions. The sales were split between two days and are detailed in a Form 4 insider filing for American Tower.

On what dates did Ruth T. Dowling sell AMT (AMT) shares?

Ruth T. Dowling sold AMT shares on April 28, 2026 and April 29, 2026. These trades are reported as separate open-market sales of common stock in the Form 4 filing.

At what prices were the AMT shares sold by Ruth T. Dowling?

Dowling sold 556 shares at $178.48 per share on April 28, 2026, and 416 shares at $177.54 per share on April 29, 2026. Both are reported as open-market sales of American Tower common stock.

How many AMT shares does Ruth T. Dowling hold after these sales?

After the reported sales, Ruth T. Dowling directly holds 29,461 shares of American Tower common stock. This post-transaction holding is disclosed in the Form 4 as her direct ownership position.

What type of transaction code is used for Ruth T. Dowling’s AMT sales?

Both transactions use code “S”, which the Form 4 describes as a sale in open market or private transaction. This indicates routine open-market sales of American Tower common stock.