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© 2026 DataHeimdall. All rights reserved.Data sourced from SEC EDGAR public filings.
Insider Trades

AMT

AMERICAN TOWER CORP /MA/

Superinvestors

Institutional investors holding AMT

Consensus →
InvestorFundWeightSharesValueQuarter
William Von MuefflingCantillon Capital Management1.85%1,612,473$278.3M2026Q1
Viking Global InvestorsViking Global Investors1.79%2,797,125$618.2M2025Q2
Chase ColemanTiger Global Management0.69%605,000$80.1M2017Q2
Thomas GaynerMarkel Group0.18%18,700$708K2000Q4
Chuck AkreAkre Capital Management0.14%50,772$8.8M2026Q1
Kenneth FisherFisher Asset Management0.10%1,736,413$299.7M2026Q1
Christopher DavisDavis Selected Advisers0.05%64,620$11.2M2026Q1
Meridian / ArrowMarkMeridian Contrarian Fund0.01%2,216$382K2026Q1
Dodge & CoxDodge & Cox0.00%900$230K2022Q2
Bill & Melinda Gates FoundationBill & Melinda Gates Foundation Trust0.00%11,000$1.8M2023Q3
Ruane CunniffSequoia Fund0.00%15,000$142K2001Q4
Mairs & PowerMairs & Power Growth Fund0.00%2,020$349K2026Q1

Congressional Activity

Congressional data coming soon

Insider Activity

3

Total trades

$195K

Volume

0

Buys

3

Sells

Last trade: Apr 28, 2026

Insider Tradeslast 90 days

DateInsiderTypeValue
Apr 28, 2026Ruth T DowlingSell$99K
Apr 28, 2026Ruth T DowlingSell$74K

Congressional Tradeslast 90 days

Congressional trade data is being sourced and will appear here shortly.