(AMT)

Role: President and CEO, Director
Signature: /s/ Marina A. Breed, as attorney-in-fact
Stock symbol: AMT
Transactions as of: Feb 24, 2023
Transactions value $: $0
Form type: 4
Date filed: 2/28/2023, 04:47 PM
Previous filing: May 3, 2022
Next filing: Mar 14, 2023

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AMT	Common Stock	Award	$0	+28.7K	+13.21%	$0.00	246K	Feb 24, 2023	Direct	F1
holding	AMT	Common Stock						16.9K	Feb 24, 2023	By trusts for children	F2
holding	AMT	Common Stock						193	Feb 24, 2023	By Spouse

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Reflects the number of performance-based restricted stock units ("PSUs") earned, as a result of the Compensation Committee's certification to the achievement of performance based on a three-year performance period, under the terms of PSU awards granted on March 10, 2020 and May 1, 2020. These shares will vest three years from the grant dates of such PSU awards, and each PSU represents a contingent right to receive one share of Common Stock.
F2	The reporting person disclaims beneficial ownership in shares held by trusts for children.

Content

Reflects the number of performance-based restricted stock units ("PSUs") earned, as a result of the Compensation Committee's certification to the achievement of performance based on a three-year performance period, under the terms of PSU awards granted on March 10, 2020 and May 1, 2020. These shares will vest three years from the grant dates of such PSU awards, and each PSU represents a contingent right to receive one share of Common Stock.

The reporting person disclaims beneficial ownership in shares held by trusts for children.