American Tower Corporation
American Tower Corporation (AMT) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · AMT · as of Sep 30, 2025
Ownership Breakdown
1,864
Institutional Holders
▼ 55 vs Q2
$82.41B
Total Inst. Value
▼ $13.96B vs Q2
465.89M
Shares Outstanding
freeFloat 99.68%
428.45M
13F Shares Held
▼ 7.81M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
AMT largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC real estate investment trusts | 63.64M | 13.60% | 13.60% | $12.24T | Nov 7, 2025 | ▲ 611.8K |
BLACKROCK, INC. real estate investment trusts | 45.40M | 9.70% | 9.70% | $8.73T | Nov 12, 2025 | ▼ 255.8K |
STATE STREET CORP real estate investment trusts | 20.92M | 4.47% | 4.47% | $4.06T | Nov 14, 2025 | ▼ 197.8K |
JPMORGAN CHASE & CO real estate investment trusts | 15.38M | 3.29% | 3.29% | $2.96T | Nov 26, 2025 | ▲ 2.71M |
COHEN & STEERS, INC. real estate investment trusts | 13.50M | 2.89% | 2.89% | $2.60T | Nov 14, 2025 | ▼ 402.1K |
GEODE CAPITAL MANAGEMENT, LLC real estate investment trusts | 13.27M | 2.84% | 2.84% | $2.54T | Nov 12, 2025 | ▲ 166.8K |
FMR LLC real estate investment trusts | 12.25M | 2.62% | 2.62% | $2.36T | Nov 13, 2025 | ▼ 1.34M |
MORGAN STANLEY real estate investment trusts | 10.03M | 2.14% | 2.14% | $1.93T | May 27, 2026 | ▲ 836.6K |
DEUTSCHE BANK AG\ real estate investment trusts | 7.54M | 1.61% | 1.61% | $1.45T | Nov 13, 2025 | ▲ 369.1K |
INVESCO LTD. real estate investment trusts | 6.89M | 1.47% | 1.47% | $1.32T | Nov 13, 2025 | ▲ 208.1K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
24
Increased
+13.07M shares1
New Positions
first time holders25
Decreased
−12.44M shares0
Sold Out
fully exitedNet shares change (top 50)
+630.3K
+13.07M / −12.44M
Net new holders
+0
1 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
AMT insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
0
Buy transactions
2
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
REEVE PAMELA D A director | May 28, 2026 | Gift | 810 | — | — | 21.1K | Form 4 ↗ |
Dowling Ruth T EVP, Chief Admin Ofr, GC & Sec | Apr 28, 2026 | Sale | 556 | $178.48 | $99.2K | 29.9K | Form 4 ↗ |
Dowling Ruth T EVP, Chief Admin Ofr, GC & Sec | Apr 29, 2026 | Sale | 416 | $177.54 | $73.9K | 29.5K | Form 4 ↗ |
Rossi Richard C EVP & President, U.S. Tower | Mar 10, 2026 | Award | 6,448 | — | — | 19.7K | Form 4 ↗ |
Rossi Richard C EVP & President, U.S. Tower | Mar 10, 2026 | Tax Withhold | 1,544 | $186.12 | $287.4K | 18.2K | Form 4 ↗ |
Rossi Richard C EVP & President, U.S. Tower | Mar 11, 2026 | Tax Withhold | 684 | $182.85 | $125.1K | 17.5K | Form 4 ↗ |
Font Juan SVP, Pres. & CEO, CoreSite | Mar 10, 2026 | Award | 8,060 | — | — | 31.1K | Form 4 ↗ |
Font Juan SVP, Pres. & CEO, CoreSite | Mar 10, 2026 | Tax Withhold | 1,834 | $186.12 | $341.3K | 29.3K | Form 4 ↗ |
Font Juan SVP, Pres. & CEO, CoreSite | Mar 11, 2026 | Tax Withhold | 928 | $182.85 | $169.7K | 28.4K | Form 4 ↗ |
Smith Rodney M EVP, CFO & Treasurer | Mar 10, 2026 | Award | 10,531 | — | — | 106.3K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
American Tower Corporation (AMT) is primarily owned by institutional investors, who hold approximately 92.0% of total shares outstanding. Company insiders own approximately 0.32%, while retail and public investors account for the remaining 7.71%.
The largest institutional shareholder of American Tower Corporation is VANGUARD GROUP INC, holding approximately 63.64 million shares — equal to 13.60% of outstanding shares — as of September 30, 2025.
A total of 1,864 institutional investors currently hold AMT stock, with a combined institutional value of approximately $82.41 billion as of the most recent 13F filing period.
Frequently asked questions
AMT ownershipAmerican Tower Corporation (AMT) is primarily owned by institutional investors, who hold approximately 92.0% of shares. The largest shareholder is VANGUARD GROUP INC with a 13.60% stake. Company insiders hold 0.32%. Data sourced from SEC Form 13F as of September 30, 2025.