American Tower (NYSE: AMT) director awarded 1,209 restricted stock units vesting 2027

Rhea-AI Filing Summary

American Tower director Kelly C. Chambliss reported receiving a grant of 1,209 shares of Common Stock in the form of restricted stock units. The award was made at no cash cost to Chambliss and is classified as a grant or award rather than a market purchase.

The RSUs were granted under the 2007 Equity Incentive Plan and are scheduled to vest on March 10, 2027. Each RSU converts into one share of Common Stock upon vesting. After this grant, Chambliss holds a total of 4,426 shares directly.

Insights

Equity compensation analyst

Routine equity grant to a director with future vesting, not a market trade.

The transaction shows director Kelly C. Chambliss receiving 1,209 restricted stock units of American Tower under the company’s 2007 Equity Incentive Plan. The transaction code A confirms it is a grant or award, with a stated price of $0.0000 per share, indicating compensation rather than an open-market purchase.

The RSUs vest on March 10, 2027, so Chambliss’ ability to receive the underlying shares depends on remaining in compliance with the plan’s terms until that date. Following the grant, total direct holdings are 4,426 shares, which frames this as a modest, routine board-level equity award.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Chambliss Kelly C

Role Director

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

Holdings After Transaction: Common Stock — 4,426 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^*

Chambliss Kelly C

(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	4,426	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 did AMERICAN TOWER CORP (AMT) director Kelly C. Chambliss report on this Form 4?

Kelly C. Chambliss reported receiving a grant of 1,209 restricted stock units of American Tower Common Stock. The award was made at no cash cost and represents equity-based compensation rather than an open-market stock purchase or sale.

Is the AMT Form 4 transaction by Kelly C. Chambliss a stock purchase or sale?

The Form 4 shows an equity grant, not a market trade. Transaction code A identifies it as a grant or award, with a price of $0.0000 per share, meaning the director did not buy shares in the open market or sell existing holdings.

When do Kelly C. Chambliss’s AMT restricted stock units from this filing vest?

The restricted stock units granted to Kelly C. Chambliss are scheduled to vest on March 10, 2027. Upon vesting, each RSU converts into one share of American Tower Common Stock, assuming the applicable equity plan conditions continue to be satisfied through that date.

How many AMT shares does Kelly C. Chambliss hold after this Form 4 transaction?

After this grant, Kelly C. Chambliss is reported as directly holding 4,426 shares of American Tower Common Stock. This total reflects the position following the award of 1,209 restricted stock units disclosed in the Form 4 insider transaction filing.

Under which plan were Kelly C. Chambliss’s AMT restricted stock units granted?

The restricted stock units were granted under American Tower’s 2007 Equity Incentive Plan, as amended. This plan is used to provide equity-based compensation, with each RSU representing a contingent right to receive one share of Common Stock upon vesting.