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

Sep 1, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2011-08-30

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-08-30	Class A Common Stock	M	6250	$25.43	Acquired	12300	Direct
2011-08-30	Class A Common Stock	S	6250	$52.22	Disposed	6050	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-08-30	Option to Purchase Class A Common Stock	$25.43	M	6250	Disposed	2018-12-01	Class A Common Stock (6250)	Direct

Footnotes

F1: Includes 481 shares acquired under the Company's employee stock purchase plan in May 2011.

F2: Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $52.21 to $52.25 per share.

F3: This option was granted pursuant to the 2007 Equity Incentive Plan and is exercisable in 25% cumulative annual increments beginning December 1, 2009.