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 13F filings (Q1 2026). 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
Q1 2018Cantillon Capital ManagementSell-45,6292,384,428$346,553
Q1 2018Mairs & Power Growth FundBuy3,1453,145$457
Q1 2018Torray FundSell-1,314158,832$23,085
Q4 2017Renaissance Technologies LLCBuy530,2002,703,900$385,765
Q4 2017Cantillon Capital ManagementSell-168,8682,430,057$346,696
Q4 2017Torray FundSell-6,035160,146$22,848
Q4 2017Akre Capital ManagementBuy1,6606,792,187$969,041
Q3 2017Renaissance Technologies LLCBuy623,0002,173,700$297,101
Q3 2017Cantillon Capital ManagementSell-78,7422,598,925$355,221
Q3 2017Akre Capital ManagementSell-20,3766,790,527$928,129
Q3 2017Torray FundSell-2,782166,181$22,714
Q2 2017Renaissance Technologies LLCBuy281,0611,550,700$205,189
Q2 2017Cantillon Capital ManagementSell-117,0852,677,667$354,309
Q2 2017Akre Capital ManagementBuy111,8056,810,903$901,219
Q2 2017Torray FundSell-14,972168,963$22,357
Q1 2017Tiger Global ManagementBuy605,000605,000$73,532
Q1 2017Renaissance Technologies LLCBuy424,6001,269,639$154,312
Q1 2017Cantillon Capital ManagementSell-23,5332,794,752$339,674
Q1 2017Akre Capital ManagementSell-2,3926,699,098$814,208
Q1 2017Torray FundBuy1,157183,935$22,355
Q4 2016Cantillon Capital ManagementBuy1,683,9252,818,285$297,836
Q4 2016Akre Capital ManagementBuy400,6546,701,490$708,213
Q4 2016Renaissance Technologies LLCBuy141,139845,039$89,304
Q4 2016Torray FundSell-8,850182,778$19,316
Q3 2016Torray FundSell-156,550191,628$21,717
Q3 2016Renaissance Technologies LLCBuy109,461703,900$79,773
Q3 2016Cantillon Capital ManagementSell-3,9001,134,360$128,557
Q3 2016Akre Capital ManagementSell-1,6906,300,836$714,074
Q2 2016Cantillon Capital ManagementBuy382,3601,138,260$129,318
Q2 2016Torray FundSell-240,938348,178$39,557

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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