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AMT · American Tower Corp /Ma/ · Holdings

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$166.18 +1.40 (+0.85%) At close · Oct 7
Market Cap
$77.54B
Shares
465.96M
Volume · Oct 7 2.47M Avg daily vol (3M) 2.61M

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.

Some SEC filings for this period have not finished importing. Holder totals and changes may be incomplete; these filings remain queued for recovery.
The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 1,764
Total Value: $72,440,795,286
Total Shares: 442,874,194
Showing 1–100 of 1,812 holdings by value · page 1 of 19

Institutional Ownership Trend

28 quarters

Holder Concentration

Across 1,760 13F filers
Top Holder
10.3%
Sep 2023 → Jun 2026 · range 10.3% – 14.7%
of institutional value
Top 5
31.6%
Sep 2023 → Jun 2026 · range 31.6% – 36.6%
of institutional value
Top 10
43.4%
Sep 2023 → Jun 2026 · range 42.5% – 48.2%
of institutional value
HHI
290
Sep 2023 → Jun 2026 · range 290 – 428
Broadly held
Showing 100 of 1,812
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1053507 CUSIP 03027X100 13F (30d) 78 filings 64 filers Visit website Investor relations