Market Cap for American Tower (AMT)
According to American Tower's latest reported financial statements, the company's latest reported market cap is $80.57B USD. Market capitalization is the total dollar value of all outstanding shares — shares outstanding × stock price — and the standard measure of a company's equity value. On this page, historical market cap snaps filing-period share counts to closing prices on or before each statement date (not intraday tick data).
Headline figure above is from the reporting period ending (reported ). Chart and table below cover the full reported history back to .
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Latest period
$80.57B
YoY change
+1.0%
5Y CAGR
-8.9%
Peak year (2021)
$132.59B
Latest annual
$83.18B
Market Cap history chart for American Tower (AMT) from 1998 to 2026
Market Cap history table for American Tower (AMT) from 1998 to 2026
| Fiscal year | Period ended | Reported | Market Cap | YoY |
|---|---|---|---|---|
| 2026 | $83.18B | +1.0% | ||
| 2025 | $82.37B | -4.1% | ||
| 2024 | $85.86B | -14.9% | ||
| 2023 | $100.85B | +2.9% | ||
| 2022 | $98.04B | -26.1% | ||
| 2021 | $132.59B | +32.4% | ||
| 2020 | $100.13B | -2.2% | ||
| 2019 | $102.39B | +46.1% | ||
| 2018 | $70.07B | +13.8% | ||
| 2017 | $61.59B | +35.8% | ||
| 2016 | $45.37B | +10.6% | ||
| 2015 | $41.01B | +3.7% | ||
| 2014 | $39.55B | +24.1% | ||
| 2013 | $31.86B | +3.3% | ||
| 2012 | $30.85B | +28.5% | ||
| 2011 | $24.02B | +15.1% | ||
| 2010 | $20.87B | +18.7% | ||
| 2009 | $17.58B | +43.4% | ||
| 2008 | $12.27B | -32.4% | ||
| 2007 | $18.15B | +11.6% | ||
| 2006 | $16.26B | +98.4% | ||
| 2005 | $8.20B | +98.6% | ||
| 2004 | $4.13B | +83.3% | ||
| 2003 | $2.25B | +226.3% | ||
| 2002 | $689.95M | -62.0% | ||
| 2001 | $1.81B | -71.6% | ||
| 2000 | $6.39B | +39.7% | ||
| 1999 | $4.58B | +94.0% | ||
| 1998 | $2.36B | — |
Market Cap values are taken from American Tower's reported income statements (10-Q quarterly and 10-K annual filings with the U.S. Securities and Exchange Commission). Each row shows the period end date and the date the filing was reported; YoY compares each figure to the same period one year earlier. Amounts are in USD as filed.
Analysis
As of the 2026 fiscal year, American Tower (AMT) reported market cap of $83.18B – edged up 1.0% year-over-year.
American Tower market cap compound annual growth for the 2021–2026 (5 years) window is -8.9%, with a net decline across the window.
American Tower market cap peaked at $132.59B in 2021; the latest annual figure is $83.18B in 2026 (37.3% below peak).
The dataset's maximum market cap sits at $132.59B (2021); the minimum reading of $689.95M dates to 2002.
American Tower (AMT) sits 4th of 8 Real Estate peers we track on this metric, against a peer median of $66.36B.
American Tower Market Cap by Year
American Tower Market Cap 2026: $83.18B
American Tower market cap in 2026 was $83.18B, edged up 1.0% from 2025.
American Tower Market Cap 2025: $82.37B
American Tower market cap in 2025 was $82.37B, edged down 4.1% below 2024.
American Tower Market Cap 2024: $85.86B
American Tower market cap in 2024 was $85.86B, declined 14.9% below 2023.
American Tower Market Cap 2023: $100.85B
American Tower market cap in 2023 was $100.85B, edged up 2.9% from 2022.
American Tower Market Cap 2022: $98.04B
American Tower market cap in 2022 was $98.04B.
See more financial history for American Tower (AMT).
Sector peers — Market Cap
Companies in the same sector as American Tower, ranked by their latest market cap.
| Company | Market Cap | Sector |
|---|---|---|
| Welltower Inc. (WELL) | $150.38B | Real Estate |
| Prologis, Inc. (PLD) | $131.94B | Real Estate |
| Equinix, Inc. (EQIX) | $106.16B | Real Estate |
| Digital Realty Trust, Inc. (DLR) | $66.86B | Real Estate |
| Simon Property Group, Inc. (SPG) | $65.86B | Real Estate |
| Realty Income Corporation (O) | $59.26B | Real Estate |
| Public Storage (PSA) | $52.16B | Real Estate |
| CBRE Group, Inc. (CBRE) | $43.07B | Real Estate |
Frequently asked questions
What is American Tower's market cap?
- Latest reported market cap for American Tower (AMT) is $80.57B (period ending March 31, 2026).
How has American Tower market cap changed year-over-year?
- American Tower (AMT) market cap changed +1.0% year-over-year on the latest annual filing.
What is the long-term growth rate of American Tower market cap?
- American Tower (AMT) market cap compound annual growth rate is -8.9% over the most recent 5 years available.
When did American Tower market cap hit its highest annual value?
- American Tower market cap reached its highest annual value of $132.59B in 2021.
What was American Tower market cap in 2025?
- American Tower (AMT) market cap in 2025 was $82.37B.
What was American Tower market cap in 2026?
- American Tower (AMT) market cap in 2026 was $83.18B.
Metrics overview
Pick a metric for charts, filings, and peers — each row shows the latest TTM or annual value with year-over-year change.
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AMT Overview
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