As Of	Filer	Filing¹	For·On·As	Docs:Size	Issuer		Filing Agent

 4/30/12  American Tower Corp./MA           ARS        12/31/11    1:2K                                     SEC #7                   
 2/29/12‡ American Tower Corp./MA           10-K       12/31/11  123:18M                                    Donnelley … Solutions/FA 
 2/13/12  Taiclet James D Jr.               5          Dir.,Off.²  1:5K   American Tower Corp./MA           Nahata Mneesha Ohri/FA   

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‡	A non-Insider-Ownership Filing that was accepted after the SEC “closed” at 5:30:00pm ET.  The legal “Filed As Of” date may be the next, or another, day.
¹	Filing/Form Types:  -K
	5	Annual Statement of Changes in Beneficial Ownership of Securities by an Insider — Form 5 { The Filer is an Insider² of the Issuer }.
	10-K	Annual Report — Form 10-K.
	ARS	Annual Report to Security Holders.
²	Insider:  The Filer is a Director, Officer, 10% Owner and/or Other “insider” of the Issuer.