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. The similar calculation is applied by GuruFocus to calculate the Cyclically Adjusted Book per Share and the Cyclically Adjusted PB Ratio. The Cyclically Adjusted Book per Share is the average of the inflation adjusted Book Value per Share of a company over the past 10 years.
American Tower's adjusted book value per share for the three months ended in Mar. 2026 was MXN136.316. Add all the adjusted book value per share for the past 10 years together and divide the count will get our Cyclically Adjusted Book per Share, which is MXN237.40 for the trailing ten years ended in Mar. 2026.
During the past 12 months, American Tower's average Cyclically Adjusted Book Growth Rate was -6.60% per year.
During the past 3 years, the average Cyclically Adjusted Book Growth Rate was -1.90% per year.
During the past 5 years, the average Cyclically Adjusted Book Growth Rate was 2.10% per year.
During the past 10 years, the average Cyclically Adjusted Book Growth Rate was 3.80% per year.
Please click Growth Rate Calculation Example (GuruFocus) to see how GuruFocus calculates Wal-Mart Stores Inc (WMT)'s revenue growth rate. You can apply the same method to get the Cyclically Adjusted Book Growth Rate using Cyclically Adjusted Book per Share data.
During the past 13 years, the highest 3-Year average Cyclically Adjusted Book Growth Rate of American Tower was 6.50% per year. The lowest was -7.20% per year. And the median was 3.10% per year.
American Tower (MEX:AMT) Cyclically Adjusted Book per Share Explanation
If a company grows much fast than inflation, Cyclically Adjusted Book per Share may underestimate the company's equity. Cyclically Adjusted PB Ratio can seem to be too high even the actual PB Ratio is low.
For the Cyclically Adjusted PB Ratio, the book value of the past 10 years are inflation-adjusted and averaged. The result is used for P/B calculation. Since it looks at the average over the last 10 years, the Cyclically Adjusted PB Ratio is also called CAPB Ratio.
The Shiller PE Ratio was first used by professor Robert Shiller. He uses E10 for his Shiller PE Ratio calculation. E10 is the average of the inflation adjusted earnings per share of a company over the past 10 years. The similar calculation is applied by GuruFocus to calculate the Cyclically Adjusted PB Ratio. The Cyclically Adjusted Book per Share is the average of the inflation adjusted book value per share of a company over the past 10 years.
* 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.
During the past 13 years, the highestCyclically Adjusted PB Ratio of American Tower was 22.83. The lowest was 9.59. And the median was 13.86.
Be Aware
Cyclically Adjusted PB Ratio works better for cyclical companies. It gives you a better idea on the company's real book value.
American Tower Cyclically Adjusted Book per Share Related Terms
American Tower Cyclically Adjusted Book per Share Historical Data
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The historical data trend for American Tower's Cyclically Adjusted Book per Share 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.
American Tower Cyclically Adjusted Book per Share Chart
MEX:AMT vs DLR, EQIX, IRM: Cyclically Adjusted Book per Share Comparison
For the REIT - Specialty subindustry, American Tower's Cyclically Adjusted PB Ratio, along with its competitors' market caps and Cyclically Adjusted PB 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 Cyclically Adjusted PB Ratio vs REITs Industry
For the REITs industry and Real Estate sector, American Tower's Cyclically Adjusted PB Ratio distribution charts can be found below:
* The bar in red indicates where American Tower's Cyclically Adjusted PB Ratio falls into.
American Tower Cyclically Adjusted Book per Share Calculation
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. The similar calculation is applied by GuruFocus to calculate the Cyclically Adjusted Book per Share and the Cyclically Adjusted PB Ratio. The Cyclically Adjusted Book per Share is the average of the inflation adjusted Book Value per Share of a company over the past 10 years.
What is Cyclically Adjusted Book per Share? How do we calculate Cyclically Adjusted Book per Share?
Cyclically Adjusted Book per Share is the average of the inflation adjusted Book Value per Share of a company over the past 10 years. Let's use an example to explain.
If we want to calculate the Cyclically Adjusted Book per Share of Wal-Mart (WMT) for Dec. 31, 2010, we need to have the inflation data and the book value per share from 2001 through 2010.
We adjusted the 2001 book value per share data with the total inflation from 2001 through 2010 to the equivalent book value in 2010. If the total inflation from 2001 to 2010 is 40%, and Wal-Mart's book value is $1 a share in 2001, then the 2001's equivalent book value in 2010 is $1.4 a share. If Wal-Mart's book value is $1 again in 2002, and the total inflation from 2002 through 2010 is 35%, then the equivalent 2002 book value in 2010 is $1.35. So on and so forth, you get the equivalent book value per share of past 10 years. Then you add them together and divided the sum by the count to get Cyclically Adjusted Book per Share.
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.
What does a Cyclically Adjusted Book per Share of MXN237.40 mean?
American Tower (MEX:AMT) has a Cyclically Adjusted Book per Share of MXN237.40 as of Mar. 2026. Cyclically adjusted book value per share represents the company's inflation-adjusted book value per share over a 10-year period. View historical data on American Tower and its competitors.
Is American Tower's Cyclically Adjusted Book per Share too high?
American Tower's current Cyclically Adjusted Book per Share is MXN237.40. Overall, American Tower has a GF Score™ of 57/100 and is considered Modestly Undervalued, reflecting its overall financial health beyond just this single metric.
How does American Tower's Cyclically Adjusted Book per Share compare to DLR and EQIX?
American Tower's Cyclically Adjusted Book per Share of MXN237.40 can be compared against companies in the REITs industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Cyclically Adjusted Book per Share for a REITs company?
A good Cyclically Adjusted Book per Share depends on the REITs industry context. However, Cyclically Adjusted Book per Share 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 Cyclically Adjusted Book per Share mean?
A high Cyclically Adjusted Book per Share can signal that a stock is expensive relative to its fundamentals. Cyclically adjusted book value per share represents the company's inflation-adjusted book value per share over a 10-year period. View historical data on American Tower and its competitors. American Tower's current Cyclically Adjusted Book per Share is MXN237.40. 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 MXN3,658.64, compared to a current price of MXN2,887.13 — trading 21.1% below its estimated fair value. The current Cyclically Adjusted Book per Share is MXN237.40. American Tower's overall GF Score™ is 57/100 with 5 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Cyclically Adjusted Book per Share calculated?
Cyclically Adjusted Book per Share is calculated from a company's financial statements. For American Tower (MEX:AMT), the current Cyclically Adjusted Book per Share is MXN237.40 as of Mar. 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 MXN2,887.13 is trading 21.1% below its estimated GF Value™ of MXN3,658.64.
GuruFocus considers American Tower to be Modestly Undervalued.
Key valuation signals for MEX:AMT:
Cyclically Adjusted Book per Share: MXN237.40
GF Value™: MXN3,658.64 vs. price of MXN2,887.13 (21.1% below fair value)
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.
57GF Score
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