AMERICAN TOWER CORP /MA/ — Director's Dealing 2011

Dec 5, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2011-12-01

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-12-01	Class A Common Stock	M	2232	—	Acquired	8282	Direct
2011-12-01	Class A Common Stock	F	709	$58.60	Disposed	7573	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-12-01	Restricted Stock Units	$	M	2232	Disposed		Class A Common Stock (2232)	Direct

Footnotes

F1: Each Restricted Stock Unit (RSU) respresents a contingent right to receive one share of Class A Common Stock.

F2: This RSU was granted on December 1, 2008 pursuant to the 2007 Equity Incentive Plan, and vests in 25% cumulative annual increments beginning December 1, 2009. This Form 4 reflects the vesting of this RSU as of December 1, 2011 as to 75% of the original grant amount.