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 2025Mairs & Power Growth FundSell-1,0112,020$354,651
Q4 2025Renaissance Technologies LLCBuy87,100162,039$28,449,187
Q4 2025Akre Capital ManagementSell-187,576255,267$44,817,227
Q4 2025Cantillon Capital ManagementBuy14,7091,830,525$321,385,274
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
Q3 2025Renaissance Technologies LLCSell-40,90074,939$14,412,268
Q3 2025Akre Capital ManagementSell-472,406442,843$85,167,566
Q3 2025Cantillon Capital ManagementSell-20,0351,815,816$349,217,733
Q2 2025Torray FundSell-45,4162,905$642,063
Q2 2025Mairs & Power Growth FundBuy402,060$455,301
Q2 2025Alapocas Investment PartnersSell-9604,791$1,058,907
Q2 2025Sequoia Financial AdvisorsBuy6199,863$2,179,953
Q2 2025Akre Capital ManagementSell-1,673,943915,249$202,288,334
Q2 2025Cantillon Capital ManagementSell-53,3391,835,851$405,759,788
Q2 2025Viking Global InvestorsBuy1,958,3292,797,125$618,220,568
Q1 2025Torray FundSell-60248,321$10,514,650
Q1 2025Alapocas Investment PartnersSell-29,3045,751$1,251,418
Q1 2025Sequoia Financial AdvisorsBuy1489,244$2,011,561
Q1 2025Cantillon Capital ManagementSell-58,4051,889,190$411,087,744
Q1 2025Akre Capital ManagementSell-2,914,2212,589,192$563,408,179
Q1 2025Viking Global InvestorsSell-58,544838,796$182,522,010
Q4 2024Torray FundBuy6,75248,923$8,972,967
Q4 2024Sequoia Financial AdvisorsSell-213,2409,096$1,668,269
Q4 2024Alapocas Investment PartnersSell-39535,055$6,429,438
Q4 2024Renaissance Technologies LLCBuy71,039115,839$21,246,031
Q4 2024Cantillon Capital ManagementBuy10,3431,947,595$357,208,399
Q4 2024Akre Capital ManagementSell-549,1195,503,413$1,009,380,978

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.