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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-03-12	Common Stock	M	16130	—	Acquired	107554	Direct
2013-03-12	Common Stock	F	7513	$76.03	Disposed	100041	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-03-12	Restricted Stock Units	$	M	16130	Disposed		Common Stock (16130)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1630	Indirect

Footnotes

F1: The reporting person disclaims beneficial ownership in shares owned by minor children.

F2: Each Restricted Stock Unit (RSU) respresents a contingent right to receive one share of Common Stock.

F3: 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.