American Tower Corp
Ownership
Ownership Structure
Who owns American Tower Corp (AMT)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.7% of the shares are freely tradable; institutional investors hold 96.7%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 9.83 | 45,796,561 | +1.9 | 06/30/2026 |
| Vanguard Capital Management, LLC | 6.53 | 30,437,771 | +0.2 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 5.98 | 27,851,812 | +0.9 | 06/30/2026 |
| State Street Corp | 4.74 | 22,066,202 | +2.9 | 06/30/2026 |
| Geode Capital Management, LLC | 2.97 | 13,838,970 | -0.7 | 06/30/2026 |
| Cohen & Steers Inc | 2.96 | 13,777,789 | +9.2 | 06/30/2026 |
| FMR Inc | 2.44 | 11,376,427 | +0.5 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Real Estate Index Investor | 3.79 | 17,642,393 | +0.7 | 09/30/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.17 | 14,789,873 | -0.1 | 09/30/2026 |
| Vanguard 500 Index Investor | 2.63 | 12,238,114 | -1.1 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Dowling Ruth T | EVP, Chief Admin Ofr, GC & Sec | 26,133 | 4,907,777 $ | Oct 29, 2026 | direct |
| Meyer Robert Joseph | SVP & Advisor to the CFO | 21,428 | 4,024,178 $ | Jul 29, 2026 | direct |
| Blanchett Paul | SVP & Chief Accounting Officer | 16,299 | 3,060,952 $ | Oct 1, 2026 | direct |
| Kalathur Rajesh | Director | 7,765 | 1,458,267 $ | Aug 21, 2026 | direct |
| Clarke Teresa Hillary | Director | 5,645 | 1,060,175 $ | Oct 20, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 29, 2026 | Dowling Ruth T | EVP, Chief Admin Ofr, GC & Sec | Sell | 952 | 185.81 | 176,891 |
| Oct 28, 2026 | Dowling Ruth T | EVP, Chief Admin Ofr, GC & Sec | Sell | 626 | 182.00 | 113,932 |
| Oct 20, 2026 | Clarke Teresa Hillary | Director | Buy | 43 | 183.20 | 7,878 |
| Oct 1, 2026 | Blanchett Paul | SVP & Chief Accounting Officer | Other | 16,299 | 0.00 | – |
| Aug 21, 2026 | Kalathur Rajesh | Director | Buy | 2,829 | 177.00 | 500,733 |
| Jul 29, 2026 | Meyer Robert Joseph | SVP & Advisor to the CFO | Sell | 5,000 | 178.89 | 894,450 |
| Jul 29, 2026 | Dowling Ruth T | EVP, Chief Admin Ofr, GC & Sec | Sell | 1,106 | 174.96 | 193,506 |
| Jul 28, 2026 | Dowling Ruth T | EVP, Chief Admin Ofr, GC & Sec | Sell | 685 | 169.54 | 116,135 |
| Jul 13, 2026 | Clarke Teresa Hillary | Director | Buy | 46 | 167.52 | 7,706 |
| Apr 28, 2026 | Clarke Teresa Hillary | Director | Buy | 44 | 177.08 | 7,792 |
| Feb 2, 2026 | Clarke Teresa Hillary | Director | Buy | 31 | 178.04 | 5,519 |
| Oct 20, 2025 | Clarke Teresa Hillary | Director | Buy | 29 | 189.12 | 5,484 |
| Jul 11, 2025 | Clarke Teresa Hillary | Director | Buy | 24 | 223.23 | 5,358 |
| Apr 28, 2025 | Clarke Teresa Hillary | Director | Buy | 25 | 209.33 | 5,233 |
| Feb 3, 2025 | Clarke Teresa Hillary | Director | Buy | 18 | 187.27 | 3,371 |
| Oct 25, 2024 | Clarke Teresa Hillary | Director | Buy | 14 | 227.42 | 3,184 |
| Jul 12, 2024 | Clarke Teresa Hillary | Director | Buy | 16 | 204.28 | 3,268 |
| Apr 26, 2024 | Clarke Teresa Hillary | Director | Buy | 19 | 172.82 | 3,284 |
| Feb 1, 2024 | Clarke Teresa Hillary | Director | Buy | 8 | 199.95 | 1,600 |
| Oct 27, 2023 | Clarke Teresa Hillary | Director | Buy | 8 | 171.52 | 1,372 |
| Jul 10, 2023 | Clarke Teresa Hillary | Director | Buy | 7 | 193.78 | 1,356 |
| Apr 28, 2023 | Clarke Teresa Hillary | Director | Buy | 7 | 205.93 | 1,442 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: October 30, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.