Director at American Tower (NYSE: AMT) receives 1,209 RSUs grant

Rhea-AI Filing Summary

REILLY EUGENE F reported acquisition or exercise transactions in this Form 4 filing.

American Tower director Eugene F. Reilly received a grant of 1,209 restricted stock units of Common Stock on March 10, 2026 as compensation. The award was made at a price of $0.00 per unit under the 2007 Equity Incentive Plan and will vest on March 10, 2027. Each RSU represents a contingent right to receive one share of Common Stock. After this grant, Reilly directly holds 6,898 shares of American Tower common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider REILLY EUGENE F

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	1,209	$0.00	--

Holdings After Transaction: Common Stock — 6,898 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).

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^*

REILLY EUGENE F

(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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
03/10/2026

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	03/10/2026		A		1,209(1)	A	$0	6,898	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. These restricted stock units ("RSUs") were granted pursuant to the 2007 Equity Incentive Plan, as amended, and vest on March 10, 2027. Each RSU represents a contingent right to receive one share of Common Stock.

Remarks:

	/s/ Marina A. Breed, as attorney-in-fact	03/12/2026
	** 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 American Tower (AMT) report for Eugene F. Reilly?

American Tower reported that director Eugene F. Reilly received 1,209 restricted stock units of Common Stock as a grant. The award was made at $0.00 per unit as part of his equity-based compensation under the company’s 2007 Equity Incentive Plan.

When do Eugene F. Reilly’s newly granted AMT restricted stock units vest?

The 1,209 restricted stock units granted to Eugene F. Reilly vest on March 10, 2027. Vesting means he becomes entitled to receive one share of American Tower Common Stock for each unit, assuming all conditions of the equity plan are satisfied at that time.

How many AMT shares does Eugene F. Reilly hold after this Form 4 transaction?

Following the grant, Eugene F. Reilly directly holds 6,898 shares of American Tower Common Stock. This total reflects his direct ownership position after receiving the 1,209 restricted stock units reported in the Form 4 filing as part of his director compensation.

Was Eugene F. Reilly’s AMT equity transaction a market purchase or sale?

The filing shows a grant of 1,209 restricted stock units at $0.00 per share, not a market trade. It is classified as a grant or award acquisition, meaning it is compensation-based rather than an open-market purchase or sale of American Tower shares.

What does each AMT restricted stock unit represent in Eugene F. Reilly’s grant?

Each restricted stock unit in Eugene F. Reilly’s grant represents a contingent right to receive one share of American Tower Common Stock. The units convert into shares only upon vesting on March 10, 2027, in line with the terms of the 2007 Equity Incentive Plan.