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

Jul 11, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2012-07-09

Reporting Person: TAICLET JAMES D JR (Director, Chairman, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-07-09	Common Stock	M	60000	$18.15	Acquired	129640	Direct
2012-07-09	Common Stock	S	60000	$71.21	Disposed	69640	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-07-09	Option to Purchase Common Stock	$18.15	M	60000	Disposed	2015-04-01	Common Stock (60000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1630	Indirect

Footnotes

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

F2: Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $70.71 to $71.66 per share.

F3: Mr. Taiclet disclaims beneficial ownership in shares owned by minor children.

F4: This option was granted pursuant to the 1997 Stock Option Plan, as amended, and is exercisable in 25% cumulative annual increments beginning April 1, 2006.