AMERICAN TOWER CORP /MA/ — Director's Dealing 2013

Mar 14, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2013-03-12

Reporting Person: DiSanto Edmund (EVP, Chief Admin Officer & GC)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-03-12	Common Stock	M	4839	—	Acquired	57884	Direct
2013-03-12	Common Stock	F	2254	$76.03	Disposed	55630	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-03-12	Restricted Stock Units	$	M	4839	Disposed		Common Stock (4839)	Direct

Footnotes

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

F2: This RSU was granted on March 12, 2012 pursuant to the 2007 Equity Incentive Plan, and vests in 25% cumulative annual increments beginning March 12, 2013. This Form 4 reflects the vesting of this RSU on March 12, 2013 as to 25% of the original grant amount.