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 Form 13F filings. 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 2026Cantillon Capital ManagementSell-218,0521,612,473$278,280,591
Q1 2026Akre Capital ManagementSell-204,49550,772$8,762,232
Q1 2026Sequoia Financial AdvisorsSell-1,2119,105$1,571,293
Q4 2025Akre Capital ManagementSell-187,576255,267$44,817,227
Q4 2025Renaissance Technologies LLCBuy87,100162,039$28,449,187
Q4 2025Cantillon Capital ManagementBuy14,7091,830,525$321,385,274
Q4 2025Mairs & Power Growth FundSell-1,0112,020$354,651
Q4 2025Sequoia Financial AdvisorsBuy62410,316$1,811,123
Q4 2025Alapocas Investment PartnersSell-3403,876$680,509
Q3 2025Akre Capital ManagementSell-472,406442,843$85,167,566
Q3 2025Renaissance Technologies LLCSell-40,90074,939$14,412,268
Q3 2025Cantillon Capital ManagementSell-20,0351,815,816$349,217,733
Q3 2025Torray FundSell-1,6841,221$234,823
Q3 2025Mairs & Power Growth FundBuy9713,031$582,922
Q3 2025Alapocas Investment PartnersSell-5754,216$810,821
Q3 2025Sequoia Financial AdvisorsSell-1719,692$1,864,042
Q2 2025Viking Global InvestorsBuy1,958,3292,797,125$618,220,568
Q2 2025Akre Capital ManagementSell-1,673,943915,249$202,288,334
Q2 2025Cantillon Capital ManagementSell-53,3391,835,851$405,759,788
Q2 2025Torray FundSell-45,4162,905$642,063
Q2 2025Alapocas Investment PartnersSell-9604,791$1,058,907
Q2 2025Sequoia Financial AdvisorsBuy6199,863$2,179,953
Q2 2025Mairs & Power Growth FundBuy402,060$455,301
Q1 2025Akre Capital ManagementSell-2,914,2212,589,192$563,408,179
Q1 2025Viking Global InvestorsSell-58,544838,796$182,522,010
Q1 2025Cantillon Capital ManagementSell-58,4051,889,190$411,087,744
Q1 2025Alapocas Investment PartnersSell-29,3045,751$1,251,418
Q1 2025Torray FundSell-60248,321$10,514,650
Q1 2025Sequoia Financial AdvisorsBuy1489,244$2,011,561
Q4 2024Viking Global InvestorsBuy897,340897,340$164,581,129

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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