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
Q4 2024Viking Global InvestorsBuy897,340897,340$164,581,129
Q3 2024Torray FundSell-5,06342,171$9,807,340
Q3 2024Matrix Private Capital GroupSell-185972$225,932
Q3 2024Alapocas Investment PartnersBuy28035,450$8,244,252
Q3 2024Renaissance Technologies LLCSell-487,03944,800$10,418,688
Q3 2024Sequoia Financial AdvisorsSell-61222,336$51,706,550
Q3 2024Cantillon Capital ManagementSell-57,9531,937,252$450,527,325
Q3 2024Akre Capital ManagementSell-81,7756,052,532$1,407,576,842
Q2 2024Torray FundSell-26,96747,234$9,181,388
Q2 2024Matrix Private Capital GroupBuy201,157$226,674
Q2 2024Alapocas Investment PartnersSell-1235,170$6,836,345
Q2 2024Sequoia Financial AdvisorsSell-74,880222,397$43,229,537
Q2 2024Cantillon Capital ManagementSell-101,1651,995,205$387,827,948
Q2 2024Akre Capital ManagementSell-63,5186,134,307$1,192,386,595
Q1 2024Torray FundBuy29,39374,201$9,256,938
Q1 2024Renaissance Technologies LLCBuy2,100531,839$105,086
Q1 2024Matrix Private Capital GroupSell-131,137$224,561
Q1 2024Mairs & Power Growth FundSell-1912,020$399,132
Q1 2024Alapocas Investment PartnersBuy1,61035,182$6,951,611
Q1 2024Sequoia Financial AdvisorsBuy196,024297,277$58,739,059
Q1 2024Cantillon Capital ManagementSell-42,0542,096,370$414,221,748
Q1 2024Akre Capital ManagementSell-606,7746,197,825$1,224,628,242
Q4 2023Torray FundBuy18,83644,808$9,673,151
Q4 2023Mairs & Power Growth FundSell-1882,211$477,311
Q4 2023Alapocas Investment PartnersBuy32133,572$7,247,523
Q4 2023Sequoia Financial AdvisorsBuy9,975101,253$21,858,392
Q4 2023Cantillon Capital ManagementBuy271,2932,138,424$461,642,974
Q4 2023Akre Capital ManagementBuy36,3756,804,599$1,468,976,832
Q3 2023Torray FundBuy49425,972$4,271,095
Q3 2023Renaissance Technologies LLCSell-152,500529,739$87,116

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.