AMERICAN TOWER CORP /MA/ — Director's Dealing 2017

May 5, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2017-05-03

Reporting Person: REED JOANN A (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-05-03	Common Stock	M	25000	$40.34	Acquired	37758	Direct
2017-05-03	Common Stock	S	7400	$126.87	Disposed	30358	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-05-03	Option to Purchase Common Stock	$40.34	M	25000	Disposed	2017-08-01	Common Stock (25000)	Direct

Footnotes

F1: This option was granted pursuant to the 2007 Equity Incentive Plan, as amended.