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

Jul 12, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2012-07-10

Reporting Person: Marshall Steven C. (EVP & President, U.S. Tower)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-07-10	Common Stock	M	32500	$37.70	Acquired	35910	Direct
2012-07-10	Common Stock	S	32500	$72.00	Disposed	3410	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-07-10	Option to Purchase Common Stock	$37.70	M	32500	Disposed	2018-03-17	Common Stock (32500)	Direct

Footnotes

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

F2: This option was granted pursuant to the 2007 Equity Incentive Plan, and vests in 25% cumulative annual increments beginning March 17, 2009.