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

Apr 5, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMERICAN TOWER CORP /MA/ (AMT)
CIK: 0001053507
Period of Report: 2017-04-03

Reporting Person: HESS WILLIAM H (EVP, Int'l. Operations)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-04-03	Common Stock	M	17950	$62.00	Acquired	126987	Direct
2017-04-03	Common Stock	M	72539	$76.90	Acquired	199526	Direct
2017-04-03	Common Stock	S	75832	$120.84	Disposed	123694	Direct
2017-04-03	Common Stock	S	14657	$121.59	Disposed	109037	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-04-03	Option to Purchase Common Stock	$62.00	M	17950	Disposed	2022-03-12	Common Stock (17950)	Direct
2017-04-03	Option to Purchase Common Stock	$76.90	M	72539	Disposed	2023-03-11	Common Stock (72539)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	3662	Indirect
Common Stock	178	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 March 7, 2017.

F2: Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $120.46 to $121.45 per share.

F3: Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $121.46 to $121.88 per share.

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

F5: This option was granted pursuant to the 2007 Equity Incentive Plan, as amended, and is exercisable in 25% cummualtive annual increments beginning March 12, 2013.

F6: This option was granted pursuant to the 2007 Equity Incentive Plan, as amended, and is exercisable in 25% cummualtive annual increments beginning March 11, 2014.