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

Mar 14, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2012-03-12

Reporting Person: SHARBUTT DAVID E (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-03-12	Common Stock	M	12500	$35.72	Acquired	18813	Direct
2012-03-12	Common Stock	M	7152	$28.39	Acquired	25965	Direct
2012-03-12	Common Stock	S	19652	$62.05	Disposed	6313	Direct
2012-03-12	Common Stock	S	6313	$62.12	Disposed	0	Direct
2012-03-12	Common Stock	A	1009	—	Acquired	1099	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-03-12	Option to Purchase Common Stock	$35.72	M	12500	Disposed	2016-09-01	Common Stock (12500)	Direct
2012-03-12	Option to Purchase Common Stock	$28.39	M	7152	Disposed	2019-03-10	Common Stock (7152)	Direct
2012-03-12	Option to Purchase Common Stock	$62.00	A	3590	Acquired	2022-03-12	Common Stock (3590)	Direct

Footnotes

F1: Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $62.05 to $62.08 per share.

F2: Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $62.12 to $62.14 per share.

F3: The reporting person was granted 1,009 fully vested Restricted Stock Units (RSUs) pursuant to the 2007 Equity Incentive Plan on March 12, 2012. Each RSU represented a contingent right to receive on share of Common Stock.

F4: This option was granted pursuant to the 2007 Equity Incentive Plan.