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

Mar 14, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2011-03-10

Reporting Person: KATZ CAROLYN (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-03-10	Class A Common Stock	A	1231	—	Acquired	6313	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-03-10	Option to Purchase Class A Common Stock	$50.78	A	3653	Acquired	2021-03-10	Class A Common Stock (3653)	Direct

Footnotes

F1: The reporting person was granted 1,231 fully vested Restricted Stock Units (RSUs) pursuant to the 2007 Equity Incentive Plan on March 10, 2011. Each RSU represented a contingent right to receive one share of Class A Common Stock.

F2: This option was granted pursuant to the 2007 Equity Incentive Plan.