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

Sep 13, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2017-09-11

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-09-11	Common Stock	M	34000	$43.11	Acquired	304707	Direct
2017-09-11	Common Stock	S	21714	$145.75	Disposed	282993	Direct
2017-09-11	Common Stock	S	12286	$146.14	Disposed	270707	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-09-11	Option to Purchase Common Stock	$43.11	M	34000	Disposed	2020-03-10	Common Stock (34000)	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 August 10, 2017.

F2: Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $144.94 to $145.93 per share.

F3: Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $145.94 to $146.78 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, as amended, and is exercisable in 25% cumulative annual increments beginning March 10, 2011.