AMERICAN TOWER CORP (AMT) Institutional Ownership Changes & 13F Activity

AMERICAN TOWER CORP (AMT). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings. This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Cantillon Capital Management, Akre Capital Management, Sequoia Financial Advisors, Renaissance Technologies LLC, and Mairs & Power Growth Fund.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q3 2020Akre Capital ManagementSell-4,5707,033,369$1,700,176
Q3 2020Torray FundBuy21026,461$6,396
Q3 2020Sequoia Financial AdvisorsBuy521,955$473
Q3 2020Matrix Private Capital GroupSell-381,551$377
Q3 2020Mairs & Power Growth FundSell-273,145$760
Q2 2020Renaissance Technologies LLCSell-1,108,570289,639$74,883
Q2 2020Cantillon Capital ManagementBuy18,9642,098,625$542,578
Q2 2020Akre Capital ManagementSell-3,6907,037,939$1,819,589
Q2 2020Dodge & Cox Stock FundSell-4301,395$361
Q2 2020Sequoia Financial AdvisorsBuy1491,903$492
Q2 2020Torray FundSell-3626,251$6,787
Q2 2020Matrix Private Capital GroupSell-321,589$413
Q1 2020Renaissance Technologies LLCBuy402,3551,398,209$304,460
Q1 2020Akre Capital ManagementSell-144,5837,041,629$1,533,315
Q1 2020Cantillon Capital ManagementSell-2,1472,079,661$452,846
Q1 2020Torray FundSell-45226,287$5,724
Q1 2020Sequoia Financial AdvisorsBuy2521,754$382
Q1 2020Matrix Private Capital GroupSell-381,621$353
Q4 2019Renaissance Technologies LLCSell-527,970995,854$228,867
Q4 2019Torray FundSell-91,98426,739$6,145
Q4 2019Cantillon Capital ManagementSell-43,8182,081,808$478,442
Q4 2019Matrix Private Capital GroupBuy1,6591,659$383
Q4 2019Akre Capital ManagementSell-2807,186,212$1,651,535
Q4 2019Mairs & Power Growth FundSell-2003,172$729
Q4 2019Sequoia Financial AdvisorsBuy621,502$345
Q3 2019Renaissance Technologies LLCSell-250,1761,523,824$336,963
Q3 2019Cantillon Capital ManagementSell-12,3422,125,626$470,039
Q3 2019Torray FundSell-939118,723$26,253
Q3 2019Akre Capital ManagementSell-367,186,492$1,589,149
Q3 2019Mairs & Power Growth FundBuy273,372$746

Frequently asked questions about AMT activity

  • Which institutional owners are buying AMT?

    Institutional owners buying AMT include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in AMT activity?

    "Buy" means an investor increased their reported position in AMT compared to the prior reporting period. This reflects growing exposure to AMERICAN TOWER CORP (AMT) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in AMT increasing?

    Institutional interest in AMT can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.

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