AMERICAN TOWER CORP /MA/ — Director's Dealing 2012

Jun 15, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2012-06-14

Reporting Person: Lara Gustavo (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-06-14	Common Stock	M	7123	$31.50	Acquired	16545	Direct
2012-06-14	Common Stock	M	10000	$37.52	Acquired	26545	Direct
2012-06-14	Common Stock	M	5000	$37.70	Acquired	31545	Direct
2012-06-14	Common Stock	M	7152	$28.39	Acquired	38697	Direct
2012-06-14	Common Stock	M	4167	$43.11	Acquired	42864	Direct
2012-06-14	Common Stock	S	33442	$67.00	Disposed	9422	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-06-14	Option to Purchase Common Stock	$31.50	M	7123	Disposed	2016-03-01	Common Stock (7123)	Direct
2012-06-14	Option to Purchase Common Stock	$37.52	M	10000	Disposed	2017-03-15	Common Stock (10000)	Direct
2012-06-14	Option to Purchase Common Stock	$37.70	M	5000	Disposed	2018-03-17	Common Stock (5000)	Direct
2012-06-14	Option to Purchase Common Stock	$28.39	M	7152	Disposed	2019-03-10	Common Stock (7152)	Direct
2012-06-14	Option to Purchase Common Stock	$43.11	M	4167	Disposed	2020-03-10	Common Stock (4167)	Direct

Footnotes

F1: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.