Focused on building reliable datasets, financial models, and research tools for value-minded investors. Committed to turning complex data into practical guidance for value-investing and long-term wealth.
Dr. Charlie Tian is the founder and CEO of GuruFocus.com, a leading global investment research platform established in 2004. With a Ph.D. in physics, Dr. Tian transitioned from science to finance, applying a data-driven, disciplined approach to value investing.
American TowerMEX:AMT 59 Shiller PE Ratio is 35.31 as of Sep. 10, 2026, which is 59% below its 10-year median of 87.13. GuruFocus rates MEX:AMT with a GF Score™ of 59/100 and a GF Value™ of MXN3,572.43 (Modestly Undervalued). The stock has 4 warning signs investors should review. Among 476 REITs companies, American Tower ranks worse than 89.29% on this metric.
As of today (2026-09-10), American Tower's current share price is MXN3010.00. American Tower's E10 for the quarter that ended in Jun. 2026 was MXN85.25. American Tower's Shiller PE Ratio for today is 35.31.
The historical rank and industry rank for American Tower's Shiller PE Ratio or its related term are showing as below:
MEX:AMT'
s Shiller PE Ratio Range Over the Past 10 Years
Min: 34.37 Med: 87.13 Max: 121.14
Current: 36.29
During the past years, American Tower's highest Shiller PE Ratio was 121.14. The lowest was 34.37. And the median was 87.13.
MEX:AMT's Shiller PE Ratio is ranked worse than 89.29% of 476
companies
in the REITs industry
Industry Median: 13.005
vs MEX:AMT: 36.29
E10 is a concept invented by Prof. Robert Shiller, who uses E10 for his Shiller PE Ratio calculation. E10 is the average of the inflation adjusted earnings of a company over the past 10 years.
American Tower's adjusted earnings per share data for the three months ended in Jun. 2026 was MXN32.455. Add all the adjusted EPS for the past 10 years together and divide 10 will get our E10, which is MXN85.25 for the trailing ten years ended in Jun. 2026.
Shiller PE for Stocks: The True Measure of Stock Valuation
American Tower (MEX:AMT) Shiller PE Ratio Explanation
Compared with the regular PE Ratio, which works poorly for cyclical businesses, the Shiller PE Ratio smoothed out the fluctuations of profit margins during business cycles. Therefore it is more accurate in reflecting the valuation of the company.
If a company has consistent business performance, the Shiller PE Ratio should give similar results to regular PE Ratio.
Compared with the PS Ratio, the Shiller PE Ratio makes the comparison between different industries more meaningful.
Be Aware
Shiller PE Ratio assumes that over the long term, businesses and profitability revert to their means. If a company's business model does not work in the future compared with the past, Shiller PE Ratio and PS Ratio will give false valuations.
American Tower Shiller PE Ratio Related Terms
American Tower Shiller PE Ratio Historical Data
* Premium members only.
The historical data trend for American Tower's Shiller PE Ratio 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.
MEX:AMT vs DLR, EQIX, IRM: Shiller PE Ratio Comparison
For the REIT - Specialty subindustry, American Tower's Shiller PE Ratio, along with its competitors' market caps and Shiller PE Ratio 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 Shiller PE Ratio vs REITs Industry
For the REITs industry and Real Estate sector, American Tower's Shiller PE Ratio distribution charts can be found below:
* The bar in red indicates where American Tower's Shiller PE Ratio falls into.
For Shiller PE Ratio, the earnings of the past 10 years are inflation-adjusted and averaged. The result is used for P/E calculation. Since it looks at the average over the last 10 years, the Shiller PE Ratio is also called PE10.
The Shiller PE Ratio was first used by professor Robert Shiller to measure the valuation of the overall market. The same calculation is applied here to individual companies.
American Tower's Shiller PE Ratio for today 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's E10 for the quarter that ended in Jun. 2026 is calculated as:
For example, American Tower's adjusted earnings per share data for the three months ended in Jun. 2026 was:
Add all the adjusted EPS together and divide 10 will get our E10.
Please note that we use the CPI data of the country/region where the company is headquartered. If the CPI data for that country/region is not available, then we will use the CPI data of the United States as default.
American Tower (MEX:AMT) has a Shiller PE Ratio of 35.31 as of Sep. 10, 2026. Shiller price-earnings ratio is the ratio of share price to a company's inflation-adjusted earnings over a 10-year period. View historical data on American Tower and its competitors. This is 59% below median its historical median of 87.13. Over the past decade, American Tower's Shiller PE Ratio has ranged from 34.37 to 121.14. According to the industry distribution chart, American Tower ranks #425 out of 476 companies in the REITs industry, placing it in the top 89.3%.
Is American Tower's Shiller PE Ratio too high?
American Tower's current Shiller PE Ratio of 35.31 is 59% below median its 10-year median of 87.13. Over the past 10 years, this metric has ranged from a low of 34.37 to a high of 121.14. The REITs industry median Shiller PE Ratio is 13.01. American Tower's value of 35.31 is 171.5% above this industry median. Based on the distribution chart, American Tower ranks #425 out of 476 companies in the REITs industry, which is in the bottom quartile relative to peers. Overall, American Tower has a GF Score™ of 59/100 and is considered Modestly Undervalued, reflecting its overall financial health beyond just this single metric.
How does American Tower's Shiller PE Ratio compare to DLR and EQIX?
According to the REITs industry distribution chart, American Tower ranks #425 out of 476 companies for Shiller PE Ratio. This places American Tower in the lower half of its industry. The industry median Shiller PE Ratio is 13.01. American Tower's value of 35.31 is 171.5% above this benchmark. Historically, American Tower's own Shiller PE Ratio has ranged from 34.37 to 121.14 over the past decade. While the company's 10-year median is 87.13 vs. the industry median of 13.01, American Tower has consistently been above the industry average. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Shiller PE Ratio for a REITs company?
The median Shiller PE Ratio among REITs companies is 13.01, based on 476 companies in the industry. Companies in the top quartile (top 25%) have a Shiller PE Ratio significantly above this median, while those in the bottom quartile fall well below. However, Shiller PE Ratio should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. American Tower's current Shiller PE Ratio of 35.31 is 171.5% above the industry median. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Shiller PE Ratio mean?
A high Shiller PE Ratio can signal that a stock is expensive relative to its fundamentals. Shiller price-earnings ratio is the ratio of share price to a company's inflation-adjusted earnings over a 10-year period. View historical data on American Tower and its competitors. For the REITs industry, the median Shiller PE Ratio is 13.01 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. American Tower's current Shiller PE Ratio is 35.31, which is 59% below median its own 10-year median of 87.13. 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 (MEX:AMT) is currently considered Modestly Undervalued. The stock's GF Value™ is MXN3,572.43, compared to a current price of MXN3,010.00 — trading 15.7% below its estimated fair value. The current Shiller PE Ratio is 35.31, which is 59% below median its 10-year median of 87.13 and 171.5% above the REITs industry median of 13.01. American Tower's overall GF Score™ is 59/100 with 4 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Shiller PE Ratio calculated?
Shiller PE Ratio is calculated from a company's financial statements. For American Tower (MEX:AMT), the current Shiller PE Ratio is 35.31 as of Sep. 10, 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 (MEX:AMT) Overvalued in 2026?
Based on GuruFocus' analysis, American Tower stock appears to be undervalued.
The current stock price of MXN3,010.00 is trading 15.7% below its estimated GF Value™ of MXN3,572.43.
GuruFocus considers American Tower to be Modestly Undervalued.
Key valuation signals for MEX:AMT:
Shiller PE Ratio: 35.31 (59% below median its 10-year median of 87.13)
GF Value™: MXN3,572.43 vs. price of MXN3,010.00 (15.7% below fair value)
Industry Position: 171.5% above the REITs median (#425 of 476)
No single metric tells the full story. See the MEX:AMT 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.
59GF Score
Get the complete analysis for MEX:AMT
Shiller PE Ratio is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.
Quick Browse
Personalize
Premium Gurus 
Create New Portfolio
MEX:AMT has been successfully added to your 
