AMERICAN TOWER CORP /MA/ — Director's Dealing 2016

May 17, 2016

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2016-05-16

Reporting Person: Meyer Robert Joseph JR (SVP, Finance & Corp Controller)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2016-05-16	Common Stock	M	1250	$25.43	Acquired	25549	Direct
2016-05-16	Common Stock	M	2552	$39.84	Acquired	28101	Direct
2016-05-16	Common Stock	M	11799	$28.39	Acquired	39900	Direct
2016-05-16	Common Stock	S	15601	$106.50	Disposed	24299	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2016-05-16	Option to Purchase Common Stock	$25.43	M	1250	Disposed	2018-12-01	Common Stock (1250)	Direct
2016-05-16	Option to Purchase Common Stock	$39.84	M	2552	Disposed	2020-06-01	Common Stock (2552)	Direct
2016-05-16	Option to Purchase Common Stock	$28.39	M	11799	Disposed	2019-03-10	Common Stock (11799)	Direct

Footnotes

F1: This option was granted pursuant to the 2007 Equity Incentive Plan and is exercisable in 25% cummualtive annual increments beginning December 1, 2009.

F2: This option was granted pursuant to the 2007 Equity Incentive Plan and is exercisable in 25% cummualtive annual increments beginning June 1, 2011.

F3: This option was granted pursuant to the 2007 Equity Incentive Plan and is exercisable in 25% cummualtive annual increments beginning March 10, 2010.