AMERICAN TOWER CORP /MA/ — Director's Dealing 2021

May 18, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2021-05-14

Reporting Person: Sharma Amit (Spl. Adv. to CEO & Chm. APAC)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-14	Common Stock	M	63183	$62	Acquired	298983	Direct
2021-05-14	Common Stock	M	64767	$76.90	Acquired	363750	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-14	Option to Purchase Common Stock	$62.0	M	63183	Disposed	2022-03-12	Common Stock (63183.0)	Direct
2021-05-14	Option to Purchase Common Stock	$76.9	M	64767	Disposed	2023-03-11	Common Stock (64767.0)	Direct

Footnotes

F1: The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 1, 2021.

F2: This option was granted pursuant to the 2007 Equity Incentive Plan, as amended (the "Plan"), and is exercisable in 25% cumulative annual increments beginning March 12, 2013.

F3: This option was granted pursuant to the Plan and is exercisable in 25% cumulative annual increments beginning March 11, 2014.