AMERICAN TOWER CORP /MA/ — Director's Dealing 2017

Mar 8, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2017-03-07

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-03-07	Common Stock	M	69760	$28.39	Acquired	324929	Direct
2017-03-07	Common Stock	S	67945	$114.61	Disposed	256984	Direct
2017-03-07	Common Stock	S	1815	$115.16	Disposed	255169	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-03-07	Option to Purchase Common Stock	$28.39	M	69760	Disposed	2019-03-10	Common Stock (69760)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1420	Indirect
Common Stock	59817	Indirect

Footnotes

F1: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 1, 2016.

F2: Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $114.13 to $115.11 per share.

F3: Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $115.13 to $115.21 per share.

F4: The reporting person disclaims beneficial ownership in shares held by children.

F5: This option was granted pursuant to the 2007 Equity Incentive Plan and is exercisable in 25% cummualtive annual increments beginning March 10, 2010.