American Tower (AMT) EVP granted RSUs, delivers shares for tax withholding

Rhea-AI Filing Summary

American Tower executive Richard C. Rossi reported routine equity compensation and related tax withholding transactions. On March 10, 2026, he acquired 6,448 shares of Common Stock at $0.00 per share as a grant of restricted stock units under the company’s equity incentive plan, which vest in equal thirds over three years. On March 10, 2026 and March 11, 2026, a total of 2,228 shares were delivered back to the company at prices of $186.12 and $182.85 per share to cover withholding taxes due upon RSU vesting, which is not an open-market sale. After these transactions, Rossi directly owned 17,518 shares of American Tower Common Stock.

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

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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^*

Rossi Richard 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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP & President, U.S. Tower

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		6,448(1)	A	$0	19,746(2)	D
Common Stock	03/10/2026		F(3)		1,544	D	$186.12	18,202	D
Common Stock	03/11/2026		F(3)		684	D	$182.85	17,518	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 (the "Plan"), and vest 1/3rd annually over three years, commencing one year from the date of grant. Each RSU represents a contingent right to receive one share of Common Stock.

2. Includes 80 and 40 shares acquired under the issuer's employee stock purchase plan in May 2025 and November 2025, respectively.

3. Shares delivered to the issuer for the payment of withholding taxes in connection with the vesting of RSUs previously granted under the Plan.

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).
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FAQ

What insider transactions did AMT executive Richard C. Rossi report on this Form 4?

Richard C. Rossi reported an equity grant and related tax withholding. He received 6,448 shares of American Tower Common Stock as a restricted stock unit award, and 2,228 shares were delivered back to the company to satisfy withholding taxes on vesting.

Were any of Richard C. Rossi’s AMT share transactions open-market sales or purchases?

None of the reported transactions were open-market trades. Rossi received shares as a restricted stock unit grant and then delivered shares to the company solely to pay withholding taxes due on vesting, a mechanical step rather than a discretionary market sale.

How many AMT shares did Richard C. Rossi receive in his latest equity award?

Rossi received 6,448 shares of American Tower Common Stock as a grant of restricted stock units. These RSUs were issued under the company’s 2007 Equity Incentive Plan and vest in three equal annual installments starting one year from the grant date.

How many AMT shares were used to cover Richard C. Rossi’s tax obligations?

A total of 2,228 American Tower shares were delivered to the issuer for tax withholding. This included 1,544 shares at a price of $186.12 and 684 shares at $182.85, both tied to the vesting of previously granted restricted stock units.

What is Richard C. Rossi’s AMT share ownership after these Form 4 transactions?

Following the reported transactions, Rossi directly owned 17,518 shares of American Tower Common Stock. This figure reflects the new restricted stock unit grant and the shares delivered back to the company to satisfy the associated withholding tax obligations.

How do the RSUs granted to Richard C. Rossi vest over time?

The restricted stock units granted to Rossi vest in three equal annual installments. Vesting starts one year after the grant date, with one-third of the RSUs converting into common shares each year, assuming continued service and the plan’s standard conditions.