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

Mar 15, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2012-03-14

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-03-14	Common Stock	M	6250	$25.43	Acquired	15877	Direct
2012-03-14	Common Stock	S	6250	$63.00	Disposed	9627	Direct
2012-03-14	Common Stock	S	1444	$62.74	Disposed	8183	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-03-14	Option to Purchase Common Stock	$25.43	M	6250	Disposed	2018-12-01	Common Stock (6250)	Direct

Footnotes

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