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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1053507	American Tower Corp	AMT	Communications Services, Nec (4899)	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	Explanation
Class A Common Stock	Disposition	2010-12-20	64,927	$50.42	50,273	No	4	S	Direct
Class A Common Stock	Disposition	2010-12-20	24,000	$51.04	26,273	No	4	S	Direct
Class A Common Stock	Disposition	2010-12-20	1,250	$0.00	25,023	No	5	G	Direct
Class A Common Stock	Acquisiton	2010-12-20	1,000	$0.00	1,000	No	5	G	Indirect	By minor children

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct
No	4	S	Direct
No	5	G	Direct
No	5	G	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 $49.86 to $50.84 per share.
Represents the weighted average price of shares sold in multiple same-day transactions at prices ranging from $50.86 to $51.17 per share.
This transaction involved a gift of an aggregate of 1,250 shares of Class A Common Stock to Mr. Taiclet's children on December 20, 2010.
Mr. Taiclet disclaims beneficial ownership in shares owned by his minor children.