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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1053507	American Tower Corp	AMT	Real Estate Investment Trusts (6798)	650723837

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1393458	Edmund Disanto	116 Huntington Avenue Boston MA 02116	Evp, Chief Admin Ofr, Gc & Sec	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2017-09-22	10,000	$43.11	151,928	No	4	M	Direct
Common Stock	Disposition	2017-09-22	9,300	$137.90	142,628	No	4	S	Direct
Common Stock	Disposition	2017-09-22	700	$138.67	141,928	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Option to Purchase Common Stock	Disposition	2017-09-22	10,000	$0.00	10,000	$43.11

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
10,000		2020-03-10	No	4	M	Direct

Footnotes

Includes 35 shares acquired under the issuer's employee stock purchase plan in May 2017.
The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 8, 2017.
Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $137.53 to $138.51 per share.
Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $138.57 to $138.91 per share.
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.