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: Bartlett Thomas A (EVP & Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-03-10	Common Stock	M	5799	—	Acquired	27418	Direct
2014-03-10	Common Stock	F	2735	$81.18	Disposed	24683	Direct
2014-03-10	Common Stock	M	5416	—	Acquired	30099	Direct
2014-03-10	Common Stock	F	2554	$81.18	Disposed	27545	Direct
2014-03-11	Common Stock	M	4877	—	Acquired	32422	Direct
2014-03-11	Common Stock	F	2265	$81.70	Disposed	30157	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2014-03-10	Restricted Stock Units	$	M	5799	Disposed		Common Stock (5799)	Direct
2014-03-10	Restricted Stock Units	$	M	5416	Disposed		Common Stock (5416)	Direct
2014-03-11	Restricted Stock Units	$	M	4877	Disposed		Common Stock (4877)	Direct
2014-03-10	Option to Purchase Common Stock	$81.18	A	107817	Acquired	2024-03-10	Common Stock (107817)	Direct
2014-03-10	Restricted Stock Units	$	A	19710	Acquired		Common Stock (19710)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	193	Indirect

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.