AMERICAN TOWER CORP /MA/ — Director's Dealing 2014

Mar 12, 2014

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2014-03-10

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-03-10	Common Stock	M	5219	—	Acquired	60930	Direct
2014-03-10	Common Stock	F	2461	$81.18	Disposed	58469	Direct
2014-03-10	Common Stock	M	4923	—	Acquired	63392	Direct
2014-03-10	Common Stock	F	2322	$81.18	Disposed	61070	Direct
2014-03-11	Common Stock	M	4389	—	Acquired	65459	Direct
2014-03-11	Common Stock	F	2039	$81.70	Disposed	63420	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2014-03-10	Restricted Stock Units	$	M	5219	Disposed		Common Stock (5219)	Direct
2014-03-10	Restricted Stock Units	$	M	4923	Disposed		Common Stock (4923)	Direct
2014-03-11	Restricted Stock Units	$	M	4389	Disposed		Common Stock (4389)	Direct
2014-03-10	Option to Purchase Common Stock	$81.18	A	101079	Acquired	2024-03-10	Common Stock (101079)	Direct
2014-03-10	Restricted Stock Units	$	A	18478	Acquired		Common Stock (18478)	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 10, 2010 pursuant to the 2007 Equity Incentive Plan, and vests in 25% cumulative annual increments beginning March 10, 2011. This Form 4 reflects the vesting of this RSU on March 10, 2014 as to 100% of the original grant amount.

F3: This RSU was granted on March 10, 2011 pursuant to the 2007 Equity Incentive Plan, and vests in 25% cumulative annual increments beginning March 10, 2012. This Form 4 reflects the vesting of this RSU on March 10, 2014 as to 75% of the original grant amount.

F4: This RSU was granted on March 11, 2013 pursuant to the 2007 Equity Incentive Plan, and vests in 25% cumulative annual increments beginning March 11, 2014. This Form 4 reflects the vesting of this RSU on March 11, 2014 as to 25% of the original grant amount.

F5: This option was granted pursuant to the 2007 Equity Incentive Plan and is exercisable in 25% cumulative annual increments beginning March 10, 2015.

F6: This RSU was granted pursuant to the 2007 Equity Incentive Plan and vests in 25% cumulative annual increments beginning March 10, 2015.