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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	Acquisiton	2010-04-01	40,000	$12.11	160,306	No	4	M	Direct
Class A Common Stock	Disposition	2010-04-01	40,000	$42.88	120,306	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Class A Common Stock	Option to Purchase Class A Common Stock	Disposition	2010-04-01	40,000	$0.00	40,000	$12.11

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
126,743		2014-03-04	No	4	M	Direct

Footnotes

As a result of a computational error, the amount of securities reported as beneficially owned on the Form 4 filed by the reporting person on March 19, 2010 was understated by 11,608 shares. The amount of securities reported as beneficially owned on this Form 4 has been adjusted accordingly.
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 $42.39 to $43.27 per share.
This option was granted pursuant to the 1997 Stock Option Plan, as amended, and is exercisable in 25% cumulative annual increments beginning March 4, 2005.