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

  5/7/24  Hormats Robert D                  4          Director²   1:4K   American Tower Corp./MA           American Tower Corp./MA  
  5/3/24  Smith Rodney M                    4          Officer²    1:4K   American Tower Corp./MA           American Tower Corp./MA  
  5/3/24  Bartlett Thomas A                 4          Other²      1:5K   American Tower Corp./MA           American Tower Corp./MA  
  5/3/24  Hormats Robert D                  144                    1:5K   American Tower Corp./MA           E TRADE Fin’l… Office/FA 
 4/30/24  American Tower Corp./MA           10-Q        3/31/24   95:10M                                                             
 4/30/24  American Tower Corp./MA           8-K:2,9     4/30/24   12:992K                                                            
 4/17/24  Arjuna Capital                    PX14A6G     4/17/24    1:33K  American Tower Corp./MA           Securex Filings/FA       
 4/10/24  American Tower Corp./MA           ARS        12/31/23    1:35M                                    Donnelley … Solutions/FA 
 4/10/24  American Tower Corp./MA           DEFA14A                1:1.3M                                                            
 4/10/24  American Tower Corp./MA           DEF 14A     5/22/24   11:51M                                                             
 3/19/24  Font Juan                         4          Officer²    1:4K   American Tower Corp./MA           American Tower Corp./MA  
 3/19/24  Font Juan                         3          Officer²    2:424K American Tower Corp./MA           American Tower Corp./MA  
 3/19/24  Ray Neville R                     3          Director²   2:424K American Tower Corp./MA           American Tower Corp./MA  
 3/15/24  Font Juan                         144                    1:5K   American Tower Corp./MA           E TRADE Fin’l… Office/FA 
 3/14/24  American Tower Corp./MA           8-K:5,8,9   3/11/24   14:452K                                                            
 3/12/24  Chambliss Kelly C                 4          Director²   1:4K   American Tower Corp./MA           American Tower Corp./MA  
 3/12/24  Smith Rodney M                    4          Officer²    1:6K   American Tower Corp./MA           American Tower Corp./MA  
 3/12/24  Noel Eugene M                     4          Officer²    1:6K   American Tower Corp./MA           American Tower Corp./MA  
 3/12/24  Thompson Samme L                  4          Director²   1:4K   American Tower Corp./MA           American Tower Corp./MA  
 3/12/24  Reeve Pamela D A                  4          Director²   1:4K   American Tower Corp./MA           American Tower Corp./MA  

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¹	Filing/Form Types:  -U
	3	Initial Statement of Beneficial Ownership of Securities by an Insider — Form 3 { The Filer is an Insider² of the Issuer }.
	4	Statement of Changes in Beneficial Ownership of Securities by an Insider — Form 4 { The Filer is an Insider² of the Issuer }.
	8-K	Current Report — Form 8-K { Item 1: Business & Operations;  2: Financial Info;  3: Securities & Trading;  4: Accountants & Accounting;  5: Governance & Management;  6: Asset-Backed Securities;  7: Disclosures;  8: Events;  9: Financials }.
	10-Q	Quarterly Report — Form 10-Q.
	144	Notice of a Proposed Sale of Securities by an Insider — Form 144 { The Filer is an Insider² of the Issuer }.
	ARS	Annual Report to Security Holders.
	DEF 14A	Definitive Proxy Statement — Schedule 14A.
	DEFA14A	Definitive Additional Proxy Soliciting Material — Schedule 14A.
	PX14A6G	Notice of an Exempt Non-Management Proxy Solicitation.
²	Insider:  The Filer is a Director, Officer, 10% Owner and/or Other “insider” of the Issuer.