American Tower director granted 1,209 RSUs

Lieblein Grace reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Lieblein Grace reported acquisition or exercise transactions in this Form 4 filing.

American Tower director Grace Lieblein reported an equity award of 1,209 shares of Common Stock in the form of restricted stock units. The RSUs were granted at no cash cost to her and increase her direct holdings to 9,141 shares after the transaction.

The RSUs were granted under the company’s 2007 Equity Incentive Plan and are scheduled to vest on March 10, 2027. Each RSU represents a contingent right to receive one share of American Tower Common Stock if the vesting conditions are satisfied.

Insider Trade Summary

Grant/Award: 1,209 shares

Grant/Award 1 txn

Insider Lieblein Grace

Role Director

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

Holdings After Transaction: Common Stock — 9,141 shares (Direct)

Footnotes (1)

1. F1. 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.

FAQ

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

What insider transaction did AMERICAN TOWER (AMT) disclose for Grace Lieblein?

AMERICAN TOWER disclosed that director Grace Lieblein received an equity award of 1,209 restricted stock units of Common Stock. These RSUs were granted as compensation, with no cash purchase involved, and increase her directly held position to 9,141 shares following the grant.

How many American Tower shares does Grace Lieblein hold after this Form 4?

After this grant, Grace Lieblein directly holds 9,141 shares of American Tower Common Stock. This total includes the newly awarded 1,209 restricted stock units, which represent a contingent right to receive one share each upon vesting under the company’s equity incentive plan.

What type of equity award did AMT grant to director Grace Lieblein?

Grace Lieblein received 1,209 restricted stock units, or RSUs, tied to American Tower Common Stock. Each RSU represents a contingent right to one share, granted under the 2007 Equity Incentive Plan, forming part of her non-cash director compensation package at the company.

When do Grace Lieblein’s American Tower RSUs from this filing vest?

The 1,209 restricted stock units granted to Grace Lieblein vest on March 10, 2027. Vesting means she will become entitled to receive one share of American Tower Common Stock for each RSU, assuming the applicable conditions under the equity incentive plan are met.

Did Grace Lieblein buy or sell AMT shares on the market in this Form 4?

This Form 4 does not show any open-market buy or sell by Grace Lieblein. It reports a grant of 1,209 restricted stock units as compensation, coded as an acquisition (A), with no sale transactions or purchase price per share disclosed in the filing data.

Is Grace Lieblein’s AMT equity award linked to options or other derivatives?

The reported transaction involves restricted stock units, not stock options or other derivatives. Each RSU directly corresponds to a contingent right to receive one AMT Common Stock share upon vesting, and the filing shows no separate derivative securities remaining after this grant event.

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

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Accepted by SEC EDGAR 03/12/2026 - 04:17 PM Learn about SEC filing dates

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^*

Lieblein Grace

(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	9,141	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.
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