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 2022Sequoia Financial AdvisorsSell-7352,893$621
Q3 2022Alapocas Investment PartnersBuy57329,077$6,243
Q3 2022Cantillon Capital ManagementSell-13,1281,831,099$393,137
Q3 2022Parnassus Endeavor FundSell-1,022,4701,950,898$418,858
Q2 2022Torray FundSell-1,68326,701$6,825
Q2 2022Matrix Private Capital GroupSell-141,271$327
Q2 2022Mairs & Power Growth FundBuy1892,214$566
Q2 2022Sequoia Financial AdvisorsBuy6133,628$927
Q2 2022Alapocas Investment PartnersBuy31528,504$7,285
Q2 2022Cantillon Capital ManagementSell-8,3181,844,227$471,366
Q2 2022Parnassus Endeavor FundBuy78,2392,973,368$759,963
Q2 2022Akre Capital ManagementSell-25,1906,973,187$1,782,277
Q1 2022Dodge & Cox Stock FundSell-200900$226
Q1 2022Matrix Private Capital GroupBuy81,285$323
Q1 2022Mairs & Power Growth FundBuy52,025$509
Q1 2022Sequoia Financial AdvisorsBuy7563,015$757
Q1 2022Alapocas Investment PartnersSell-18128,189$7,082
Q1 2022Cantillon Capital ManagementBuy52,7841,852,545$465,397
Q1 2022Parnassus Endeavor FundSell-673,9772,895,129$727,314
Q1 2022Akre Capital ManagementSell-10,7206,998,377$1,758,132
Q4 2021Torray FundSell-96428,384$8,302
Q4 2021Parnassus Endeavor FundSell-29,9663,569,106$1,043,963
Q4 2021Matrix Private Capital GroupBuy601,277$375
Q4 2021Sequoia Financial AdvisorsBuy6172,259$661
Q4 2021Alapocas Investment PartnersBuy28,37028,370$8,298
Q4 2021Cantillon Capital ManagementSell-134,8251,799,761$526,430
Q4 2021Akre Capital ManagementBuy1,3107,009,097$2,050,161
Q3 2021Torray FundSell-97829,348$7,789
Q3 2021Parnassus Endeavor FundBuy96,1003,599,072$955,230
Q3 2021Matrix Private Capital GroupSell-3141,217$325

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.