AMT CEO granted 24,626 performance-based shares

American Tower Corp. reported that President and CEO Steven O. Vondran acquired 24,626 shares of Common Stock through a grant classified as a grant, award, or other acquisition.

Rhea-AI Filing Summary

American Tower Corp. reported that President and CEO Steven O. Vondran acquired 24,626 shares of Common Stock through a grant classified as a grant, award, or other acquisition. The shares reflect performance-based restricted stock units earned from a prior award and were recorded at a price of $0.0000 per share.

Following this transaction, Vondran directly holds 105,374 shares of Common Stock. According to the award terms, these performance-based restricted stock units will vest three years from the original grant date of March 10, 2023, with each unit representing a right to receive one share of Common Stock.

Insider Trade Summary

Grant/Award: 24,626 shares

Grant/Award 1 txn

Insider Vondran Steven O

Role President and CEO

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	24,626	$0.00	$0.00

Holdings After Transaction: Common Stock — 105,374 shares (Direct)

Footnotes (1)

1. F1. Reflects the number of performance-based restricted stock units ("PSUs") earned, as a result of the Compensation and Human Capital Committee's certification to the achievement of performance based on a three-year performance period, under the terms of a PSU award granted on March 10, 2023. These shares will vest three years from the grant date of such PSU award, and each PSU 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 AMT President and CEO Steven Vondran report?

Steven O. Vondran reported acquiring 24,626 shares of American Tower Common Stock. The shares result from performance-based restricted stock units earned under a prior PSU award and are recorded as a grant or award acquisition, not an open-market purchase or sale.

How many AMT shares does Steven Vondran hold after this Form 4 filing?

After the reported transaction, Steven O. Vondran directly holds 105,374 shares of American Tower Common Stock. This total includes the 24,626 shares associated with performance-based restricted stock units earned under the March 10, 2023 PSU award.

What is the nature of the 24,626 AMT shares granted to Steven Vondran?

The 24,626 shares are tied to performance-based restricted stock units (PSUs) earned after committee certification of a three-year performance period. Each PSU represents a contingent right to receive one share of Common Stock, rather than being an immediate cash purchase.

When will Steven Vondran’s performance-based restricted stock units in AMT vest?

The performance-based restricted stock units earned by Steven O. Vondran will vest three years from the March 10, 2023 grant date. Vesting is based on a three-year performance period that was certified by the Compensation and Human Capital Committee.

Was there a purchase price for Steven Vondran’s newly acquired AMT shares?

The reported transaction lists a price of $0.0000 per share for the 24,626 shares. This reflects that the shares were acquired via a grant of performance-based restricted stock units, rather than through an open-market purchase with a cash consideration per share.

What triggered the earning of the PSUs reported in AMT’s Form 4?

The PSUs were earned after the Compensation and Human Capital Committee certified the achievement of performance over a three-year period. This certification related to a performance-based restricted stock unit award originally granted on March 10, 2023.

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

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Accepted by SEC EDGAR 02/27/2026 - 04:06 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^*

Vondran Steven O

(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
X	Officer (give title below)		Other (specify below)
	President and CEO

3. Date of Earliest Transaction (Month/Day/Year)
02/25/2026

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	02/25/2026		A		24,626(1)	A	$0	105,374	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. Reflects the number of performance-based restricted stock units ("PSUs") earned, as a result of the Compensation and Human Capital Committee's certification to the achievement of performance based on a three-year performance period, under the terms of a PSU award granted on March 10, 2023. These shares will vest three years from the grant date of such PSU award, and each PSU represents a contingent right to receive one share of Common Stock.

Remarks:

	/s/ Marina A. Breed, as attorney-in-fact	02/27/2026
	** 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.