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.
Iron MountainSTU:I5M +2.38%83 Cyclically Adjusted PB Ratio is 32.93 as of Aug. 16, 2026, which is 366% above its 10-year median of 7.07. GuruFocus rates STU:I5M with a GF Score™ of 83/100 and a GF Value™ of €103.39 (Fairly Valued). The stock has 10 warning signs investors should review. Among 550 REITs companies, Iron Mountain ranks worse than 99.64% on this metric.
The historical rank and industry rank for Iron Mountain's Cyclically Adjusted PB Ratio or its related term are showing as below:
STU:I5M'
s Cyclically Adjusted PB Ratio Range Over the Past 10 Years
Min: 3.13 Med: 7.07 Max: 33.27
Current: 33.24
During the past years, Iron Mountain's highest Cyclically Adjusted PB Ratio was 33.27. The lowest was 3.13. And the median was 7.07.
STU:I5M's Cyclically Adjusted PB Ratio is ranked worse than 99.64% of 550
companies
in the REITs industry
Industry Median: 0.8
vs STU:I5M: 33.24
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.
Iron Mountain's adjusted book value per share data for the three months ended in Jun. 2026 was €-3.735. 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 €3.40 for the trailing ten years ended in Jun. 2026.
Shiller PE for Stocks: The True Measure of Stock Valuation
Iron Mountain (STU:I5M) Cyclically Adjusted PB Ratio Explanation
Compared with the regular PB Ratio, which works poorly for cyclical businesses, the Cyclically Adjusted PB Ratio smoothed out the fluctuations of book value during business cycles. Therefore it is more accurate in reflecting the valuation of the company.
If a company has consistent business performance, the Cyclically Adjusted PB Ratio should give similar results to regular PB Ratio.
Iron Mountain Cyclically Adjusted PB Ratio Related Terms
Iron Mountain Cyclically Adjusted PB Ratio Historical Data
* Premium members only.
The historical data trend for Iron Mountain's Cyclically Adjusted PB 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.
STU:I5M vs CCI, SBAC, WY: Cyclically Adjusted PB Ratio Comparison
For the REIT - Specialty subindustry, Iron Mountain'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.
Iron Mountain Cyclically Adjusted PB Ratio vs REITs Industry
For the REITs industry and Real Estate sector, Iron Mountain's Cyclically Adjusted PB Ratio distribution charts can be found below:
* The bar in red indicates where Iron Mountain's Cyclically Adjusted PB Ratio falls into.
Iron Mountain Cyclically Adjusted PB Ratio Calculation
Like the Shiller PE Ratio, the Cyclically Adjusted PB Ratio takes the Book Value per Share from the past 10 years, adjusts it for inflation, and then calculates the average. This average is then used for the P/B calculation. Because it considers this 10-year average, it's often referred to as the CAPB Ratio.
The Shiller PE Ratio was first used by professor Robert Shiller to measure the valuation of the overall market. The similar calculation is applied by GuruFocus to calculate the Cyclically Adjusted PB Ratio.
Iron Mountain's Cyclically Adjusted PB 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.
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 PB Ratio of 32.93 mean?
Iron Mountain (STU:I5M) has a Cyclically Adjusted PB Ratio of 32.93 as of Aug. 16, 2026. Cyclically Adjusted PB Ratio is the ratio of share price to a company's inflation-adjusted book value per share over a 10-year period. View historical data on Iron Mountain and its competitors. This is 366% above median its historical median of 7.07. Over the past decade, Iron Mountain's Cyclically Adjusted PB Ratio has ranged from 3.13 to 33.27. According to the industry distribution chart, Iron Mountain ranks #548 out of 550 companies in the REITs industry, placing it in the top 99.6%.
Is Iron Mountain's Cyclically Adjusted PB Ratio too high?
Iron Mountain's current Cyclically Adjusted PB Ratio of 32.93 is 366% above median its 10-year median of 7.07. Over the past 10 years, this metric has ranged from a low of 3.13 to a high of 33.27. The REITs industry median Cyclically Adjusted PB Ratio is 0.80. Iron Mountain's value of 32.93 is 4016.3% above this industry median. Based on the distribution chart, Iron Mountain ranks #548 out of 550 companies in the REITs industry, which is in the bottom quartile relative to peers. Overall, Iron Mountain has a GF Score™ of 83/100 and is considered Fairly Valued, reflecting its overall financial health beyond just this single metric.
How does Iron Mountain's Cyclically Adjusted PB Ratio compare to CCI and SBAC?
According to the REITs industry distribution chart, Iron Mountain ranks #548 out of 550 companies for Cyclically Adjusted PB Ratio. This places Iron Mountain in the lower half of its industry. The industry median Cyclically Adjusted PB Ratio is 0.80. Iron Mountain's value of 32.93 is 4016.3% above this benchmark. Historically, Iron Mountain's own Cyclically Adjusted PB Ratio has ranged from 3.13 to 33.27 over the past decade. While the company's 10-year median is 7.07 vs. the industry median of 0.80, Iron Mountain 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 Cyclically Adjusted PB Ratio for a REITs company?
The median Cyclically Adjusted PB Ratio among REITs companies is 0.80, based on 550 companies in the industry. Companies in the top quartile (top 25%) have a Cyclically Adjusted PB Ratio significantly above this median, while those in the bottom quartile fall well below. However, Cyclically Adjusted PB Ratio should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Iron Mountain's current Cyclically Adjusted PB Ratio of 32.93 is 4016.3% 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 Cyclically Adjusted PB Ratio mean?
A high Cyclically Adjusted PB Ratio can signal that a stock is expensive relative to its fundamentals. Cyclically Adjusted PB Ratio is the ratio of share price to a company's inflation-adjusted book value per share over a 10-year period. View historical data on Iron Mountain and its competitors. For the REITs industry, the median Cyclically Adjusted PB Ratio is 0.80 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Iron Mountain's current Cyclically Adjusted PB Ratio is 32.93, which is 366% above median its own 10-year median of 7.07. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Iron Mountain stock overvalued right now?
Based on GuruFocus' analysis, Iron Mountain (STU:I5M) is currently considered Fairly Valued. The stock's GF Value™ is €103.39, compared to a current price of €111.95 — trading 8.3% above its estimated fair value. The current Cyclically Adjusted PB Ratio is 32.93, which is 366% above median its 10-year median of 7.07 and 4016.3% above the REITs industry median of 0.80. Iron Mountain's overall GF Score™ is 83/100 with 10 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Cyclically Adjusted PB Ratio calculated?
Cyclically Adjusted PB Ratio is calculated from a company's financial statements. For Iron Mountain (STU:I5M), the current Cyclically Adjusted PB Ratio is 32.93 as of Aug. 16, 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 Iron Mountain (STU:I5M) Overvalued in 2026?
Based on GuruFocus' analysis, Iron Mountain stock appears to be overvalued.
The current stock price of €111.95 is trading 8.3% above its estimated GF Value™ of €103.39.
GuruFocus considers Iron Mountain to be Fairly Valued.
Key valuation signals for STU:I5M:
Cyclically Adjusted PB Ratio: 32.93 (366% above median its 10-year median of 7.07)
GF Value™: €103.39 vs. price of €111.95 (8.3% above fair value)
Industry Position: 4016.3% above the REITs median (#548 of 550)
No single metric tells the full story. See the STU:I5M stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Iron Mountain Inc is an information management services provider organized and operated as a real estate investment trust. The company offers solutions to its clients to address their information management, digital transformation, information security, data center, and asset lifecycle management (ALM) needs. Its customers come from various industries, including commercial, legal, financial, healthcare, technology, etc. The company has two reportable segments: Global Records and Information Management (Global RIM) and Global Data Center. Maximum revenue is generated from the Global RIM segment, which offers data and records management, secure shredding, consumer storage, and other related services. Geographically, the company generates maximum revenue from the United States.
83GF Score
Get the complete analysis for STU:I5M
Cyclically Adjusted PB 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
STU:I5M has been successfully added to your 
