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

Mar 31, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2017-03-29

Reporting Person: DiSanto Edmund (EVP, Chief Admin Ofr, GC & Sec)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-03-29	Common Stock	M	15000	$43.11	Acquired	156893	Direct
2017-03-29	Common Stock	S	15000	$120.78	Disposed	141893	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-03-29	Option to Purchase Common Stock	$43.11	M	15000	Disposed	2020-03-10	Common Stock (15000)	Direct

Footnotes

F1: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 27, 2016.

F2: This option was granted pursuant to the 2007 Equity Incentive Plan, as amended, and is exercisable in 25% cummualtive annual increments beginning March 10, 2011.