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
Q4 2024Akre Capital ManagementSell-549,1195,503,413$1,009,380,978
Q4 2024Sequoia Financial AdvisorsSell-213,2409,096$1,668,269
Q4 2024Renaissance Technologies LLCBuy71,039115,839$21,246,031
Q4 2024Cantillon Capital ManagementBuy10,3431,947,595$357,208,399
Q4 2024Torray FundBuy6,75248,923$8,972,967
Q4 2024Alapocas Investment PartnersSell-39535,055$6,429,438
Q3 2024Renaissance Technologies LLCSell-487,03944,800$10,418,688
Q3 2024Akre Capital ManagementSell-81,7756,052,532$1,407,576,842
Q3 2024Cantillon Capital ManagementSell-57,9531,937,252$450,527,325
Q3 2024Torray FundSell-5,06342,171$9,807,340
Q3 2024Alapocas Investment PartnersBuy28035,450$8,244,252
Q3 2024Matrix Private Capital GroupSell-185972$225,932
Q3 2024Sequoia Financial AdvisorsSell-61222,336$51,706,550
Q2 2024Cantillon Capital ManagementSell-101,1651,995,205$387,827,948
Q2 2024Sequoia Financial AdvisorsSell-74,880222,397$43,229,537
Q2 2024Akre Capital ManagementSell-63,5186,134,307$1,192,386,595
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
Q1 2024Akre Capital ManagementSell-606,7746,197,825$1,224,628,242
Q1 2024Sequoia Financial AdvisorsBuy196,024297,277$58,739,059
Q1 2024Cantillon Capital ManagementSell-42,0542,096,370$414,221,748
Q1 2024Torray FundBuy29,39374,201$9,256,938
Q1 2024Renaissance Technologies LLCBuy2,100531,839$105,086
Q1 2024Alapocas Investment PartnersBuy1,61035,182$6,951,611
Q1 2024Mairs & Power Growth FundSell-1912,020$399,132
Q1 2024Matrix Private Capital GroupSell-131,137$224,561
Q4 2023Cantillon Capital ManagementBuy271,2932,138,424$461,642,974
Q4 2023Akre Capital ManagementBuy36,3756,804,599$1,468,976,832
Q4 2023Torray FundBuy18,83644,808$9,673,151

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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