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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
1218672	Jr D James Taiclet	116 Huntington Avenue Boston MA 02116	Chairman, President And Ceo	Yes	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	2012-08-07	24,491	$18.15	94,131	No	4	M	Direct
Common Stock	Disposition	2012-08-07	23,891	$70.82	70,240	No	4	S	Direct
Common Stock	Disposition	2012-08-07	600	$71.75	69,640	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	2012-08-07	24,491	$0.00	24,491	$18.15

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2015-04-01	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	1,630	Indirect	By minor children

Footnotes

The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.
Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $70.28 to $71.23 per share.
Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $71.32 to $71.96 per share.
Mr. Taiclet disclaims beneficial ownership in shares owned by minor children.
This option was granted pursuant to the 1997 Stock Option Plan, as amended, and is exercisable in 25% cumulative annual increments beginning April 1, 2006.