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

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-03-12	Option to Purchase Common Stock	$62.00	A	71798	Acquired	2022-03-12	Common Stock (71798)	Direct
2012-03-12	Restricted Stock Units	$	A	20162	Acquired		Common Stock (20162)	Direct

Footnotes

F1: This option was granted pursuant to the 2007 Equity Incentive Plan and is exercisable in 25% cumulative annual increments beginning March 12, 2013.

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

F3: This RSU was granted pursuant to the 2007 Equity Incentive Plan, and vests in 25% cumulative annual increments beginning March 12, 2013.