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AMT · American Tower Corp /Ma/

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Market Cap
$81.82B
Shares
465.89M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 1,746
Total Value: $72,408,812,811
Total Shares: 442,678,936
Showing 1–100 of 1,794 holdings by value · page 1 of 18

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 1,746 13F filers · Δ vs Mar 31, 2026
Top Holder
10.3%
Sep 2023 → Jun 2026 · range 10.3% – 14.7%
−0.0 pts
Top 5
31.6%
Sep 2023 → Jun 2026 · range 31.6% – 36.6%
−0.5 pts
Top 10
43.4%
Sep 2023 → Jun 2026 · range 42.5% – 48.2%
−1.4 pts
HHI
290
Sep 2023 → Jun 2026 · range 290 – 428
Broadly held−9

Quarterly Activity

vs Mar 31, 2026
New
172
Increased
690
Decreased
663
Sold Out
188
Unchanged
221
Holder count: -16
Institutional value: -3.4%
Shares held: +1.8%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 1,794
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1053507 CUSIP 03027X100 13F (30d) 953 filings 889 filers Visit website Investor relations