Market cap is the total market value to buy the whole company. It is equal to the share price times the number of Shares Outstanding (EOP). American Tower's share price for the quarter that ended in Mar. 2026 was €149.38. American Tower's Shares Outstanding (EOP) for the quarter that ended in Mar. 2026 was 466 Mil. Therefore, American Tower's market cap for the quarter that ended in Mar. 2026 was €69,609 Mil.
American Tower's quarterly market cap
declined
from Sep. 2025 (€76,772 Mil) to Dec. 2025 (€69,677 Mil) and
declined
from Dec. 2025 (€69,677 Mil) to Mar. 2026 (€69,609 Mil).
American Tower's annual market cap
declined
from Dec. 2023 (€91,697 Mil) to Dec. 2024 (€81,306 Mil) and
declined
from Dec. 2024 (€81,306 Mil) to Dec. 2025 (€69,677 Mil).
Enterprise Value is the theoretical takeover price. It is more comprehensive than market capitalization (market cap), which only includes common equity. Enterprise Value is calculated as the market cap plus debt and minority interest and preferred shares, minus total cash and cash equivalents. American Tower's Enterprise Value for Today is €112,949 Mil.
American Tower (WBO:AMTG) Market Cap Explanation
Market cap is not the real price you pay for a company. If you buy the company and become its owner, you become the owner of the cash the company has, and you also assume the companys debt. The real price you pay is the Enterprise Value.
Warren Buffett uses the ratio of total market cap of all public traded companies over GDP to measure if the market is expensive. As of April 2012, the US total market cap is about $14.7 trillion, while the US GDP is about $15 trillion. The market was modestly overvalued.
American Tower Market Cap Related Terms
American Tower Market Cap Historical Data
* Premium members only.
The historical data trend for American Tower's Market Cap can be seen below:
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
For the REIT - Specialty subindustry, American Tower's Market Cap, along with its competitors' market caps and Market Cap data, can be viewed below:
* Competitive companies are chosen from companies within the same industry, with headquarter located in same country, with closest market capitalization; x-axis shows the market cap, and y-axis shows the term value; the bigger the dot, the larger the market cap. Note that "N/A" values will not show up in the chart.
American Tower Market Cap vs REITs Industry
For the REITs industry and Real Estate sector, American Tower's Market Cap distribution charts can be found below:
* The bar in red indicates where American Tower's Market Cap falls into.
Market cap is the short version of market capitalization. It is the total market value to buy the whole company. It is equal to the share price times the number of shares outstanding.
American Tower's Market Cap for the fiscal year that ended in Dec. 2025 is calculated as
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
American Tower (WBO:AMTG) has a Market Cap of €69,004 Mil as of Jun. 30, 2026. Market cap equals the total value of a company's shares: price times shares outstanding. View historical data on American Tower and its competitors. According to the industry distribution chart, American Tower ranks #4 out of 985 companies in the REITs industry, placing it in the top 0.40000000000001%.
Is American Tower's Market Cap too high?
American Tower's current Market Cap is €69,004 Mil. Based on the distribution chart, American Tower ranks #4 out of 985 companies in the REITs industry, which is in the top quartile — a strong position relative to peers. Overall, American Tower has a GF Score™ of 67/100 and is considered Modestly Undervalued, reflecting its overall financial health beyond just this single metric.
How does American Tower's Market Cap compare to DLR and EQIX?
According to the REITs industry distribution chart, American Tower ranks #4 out of 985 companies for Market Cap. This places American Tower in the top 0% of its industry — outperforming the majority of peers. The industry median Market Cap is 284.81. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Market Cap for a REITs company?
The median Market Cap among REITs companies is 284.81, based on 985 companies in the industry. Companies in the top quartile (top 25%) have a Market Cap significantly above this median, while those in the bottom quartile fall well below. However, Market Cap should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Market Cap mean?
A high Market Cap can signal that a stock is expensive relative to its fundamentals. Market cap equals the total value of a company's shares: price times shares outstanding. View historical data on American Tower and its competitors. For the REITs industry, the median Market Cap is 284.81 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. American Tower's current Market Cap is €69,004 Mil. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is American Tower stock overvalued right now?
Based on GuruFocus' analysis, American Tower (WBO:AMTG) is currently considered Modestly Undervalued. The stock's GF Value™ is €181.80, compared to a current price of €148.05 — trading 18.6% below its estimated fair value. The current Market Cap is €69,004 Mil. American Tower's overall GF Score™ is 67/100 with 5 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Market Cap calculated?
Market Cap is calculated from a company's financial statements. For American Tower (WBO:AMTG), the current Market Cap is €69,004 Mil as of Jun. 30, 2026. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.
Is American Tower (WBO:AMTG) Overvalued in 2026?
Based on GuruFocus' analysis, American Tower stock appears to be undervalued.
The current stock price of €148.05 is trading 18.6% below its estimated GF Value™ of €181.80.
GuruFocus considers American Tower to be Modestly Undervalued.
Key valuation signals for WBO:AMTG:
Market Cap: €69,004 Mil
GF Value™: €181.80 vs. price of €148.05 (18.6% below fair value)
No single metric tells the full story. See the WBO:AMTG stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
American Tower owns and operates about 150,000 wireless towers throughout the US, Asia, Latin America, Europe, and Africa. It also owns and/or operates 30 data centers in 11 US markets through its CoreSite segment. The company's customer base in the tower business is very concentrated, with most revenue in each market generated by the top three or four mobile carriers. The company operates 42,000 towers in the US, which accounted for about half of total revenue in 2025. Outside the US, American Tower operates about 47,000 towers in Latin America (dominated by Brazil), 33,000 towers in Europe, and 28,000 towers in Africa. American Tower operates as a REIT.
67GF Score
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