AMERICAN TOWER CORP (AMT) Stock Institutional Trading Activity


AMERICAN TOWER CORP (AMT) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Akre Capital Management, Renaissance Technologies LLC, Cantillon Capital Management, Mairs & Power Growth Fund, and Torray Fund. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q3 2021Mairs & Power Growth FundSell-7582,020$536
Q3 2021Cantillon Capital ManagementSell-32,6641,934,586$513,459
Q3 2021Akre Capital ManagementSell-8,4757,007,787$1,859,937
Q2 2021Torray FundSell-74530,326$8,192
Q2 2021Dodge & Cox Stock FundSell-1951,100$297
Q2 2021Parnassus Endeavor FundBuy376,0143,502,972$946,293
Q2 2021Sequoia Financial AdvisorsBuy771,642$444
Q2 2021Cantillon Capital ManagementSell-22,2221,967,250$531,433
Q2 2021Akre Capital ManagementSell-107,8257,016,262$1,895,373
Q1 2021Torray FundBuy5,10931,071$7,428
Q1 2021Dodge & Cox Stock FundSell-1001,295$310
Q1 2021Parnassus Endeavor FundBuy3,126,9583,126,958$747,531
Q1 2021Matrix Private Capital GroupSell-121,531$366
Q1 2021Sequoia Financial AdvisorsSell-3151,565$374
Q1 2021Mairs & Power Growth FundSell-3672,778$664
Q1 2021Cantillon Capital ManagementSell-76,6751,989,472$475,603
Q1 2021Akre Capital ManagementSell-6,4717,124,087$1,703,084
Q4 2020Torray FundSell-49925,962$5,827
Q4 2020Matrix Private Capital GroupSell-81,543$348
Q4 2020Sequoia Financial AdvisorsSell-751,880$422
Q4 2020Renaissance Technologies LLCBuy357,573787,739$176,816
Q4 2020Cantillon Capital ManagementSell-10,2782,066,147$463,767
Q4 2020Akre Capital ManagementBuy97,1897,130,558$1,600,525
Q3 2020Torray FundBuy21026,461$6,396
Q3 2020Matrix Private Capital GroupSell-381,551$377
Q3 2020Sequoia Financial AdvisorsBuy521,955$473
Q3 2020Mairs & Power Growth FundSell-273,145$760
Q3 2020Renaissance Technologies LLCBuy140,527430,166$103,984
Q3 2020Cantillon Capital ManagementSell-22,2002,076,425$501,934
Q3 2020Akre Capital ManagementSell-4,5707,033,369$1,700,176

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.