• If you are wondering whether Iron Mountain stock is still reasonably priced after a strong run, this article walks through the key valuation checks investors tend to focus on.
• The share price last closed at US$125.07, with returns of 10.1% over the past month, 50.3% year to date and 28.7% over the last year, which naturally raises questions about how much value is already reflected in the price.
• Recent headlines around Iron Mountain have largely focused on its role as a specialized REIT in data and records storage, highlighting ongoing interest in infrastructure that supports digital and physical information. That context helps explain why the stock has attracted attention alongside broader discussions about demand for storage, security and related services.
• On Simply Wall St's 6 point valuation check, Iron Mountain scores a 2 out of 6. Next, you will see how different valuation methods line up for this stock and then, at the end of the article, a way to connect those numbers to a fuller picture of value.

Iron Mountain scores just 2/6 on our valuation checks. See what other red flags we found in the full valuation breakdown.

Approach 1: Iron Mountain Discounted Cash Flow (DCF) Analysis

The Discounted Cash Flow model estimates what Iron Mountain could be worth by projecting its future adjusted funds from operations and discounting those cash flows back to today’s value in $.

Iron Mountain’s latest twelve month free cash flow is about $1.54b. Using a 2 stage Free Cash Flow to Equity model based on adjusted funds from operations, analysts and extrapolated estimates project free cash flow reaching about $2.51b by 2030, with a series of annual forecasts between 2026 and 2035 that are discounted back to reflect today’s dollars.

Putting all of those projected and discounted cash flows together gives an estimated intrinsic value of about $163.14 per share. Compared with the recent share price of $125.07, the DCF output points to an implied discount of roughly 23.3%, which suggests the stock screens as undervalued on this specific cash flow model.

Result: UNDERVALUED

Our Discounted Cash Flow (DCF) analysis suggests Iron Mountain is undervalued by 23.3%. Track this in your watchlist or portfolio, or discover 49 more high quality undervalued stocks.

Approach 2: Iron Mountain Price vs Earnings

For profitable companies, the P/E ratio is a useful sense check because it tells you how many dollars investors are currently paying for each dollar of earnings. It quickly anchors the price to the company’s actual profit base.

What counts as a “normal” P/E often reflects how the market views a company’s earnings growth potential and risk. Faster, more predictable earnings growth and lower perceived risk can support a higher P/E, while slower growth or higher uncertainty usually lines up with a lower P/E.

Iron Mountain currently trades on a P/E of 136.65x. That is much higher than the Specialized REITs industry average of 16.07x and the peer group average of 20.52x. Simply Wall St also calculates a proprietary “Fair Ratio” for each stock, which for Iron Mountain is 45.45x. This Fair Ratio is designed to be more tailored than a simple peer or industry comparison because it factors in elements such as earnings growth, risk profile, profit margins, industry and market cap.

Comparing Iron Mountain’s current P/E of 136.65x with the Fair Ratio of 45.45x suggests the stock is trading well above the level implied by those fundamentals on this metric.

Result: OVERVALUED

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Upgrade Your Decision Making: Choose your Iron Mountain Narrative

Earlier it was mentioned that there is an even better way to understand valuation. Narratives take the story you believe about Iron Mountain, link it to a concrete forecast for revenue, earnings and margins, and then connect that forecast to a Fair Value you can compare with the current share price.

On Simply Wall St’s Community page, Narratives are an accessible tool used by millions of investors to set out their view. Instead of only seeing a P/E or DCF output, you see the assumptions behind it and how those translate into a Fair Value.

Because Narratives are updated when new news, guidance or earnings are added to the platform, you can quickly see whether a thesis that once pointed to a discount or premium still holds up against the latest information.

For Iron Mountain, one investor might build a Narrative around a Fair Value of about US$73, reflecting cautious assumptions for growth and margins. Another might lean on a more optimistic Narrative with a Fair Value of about US$140. Comparing either figure to the current price can help you decide whether the stock looks inexpensive, expensive or close to your own view of fair.

For Iron Mountain however we will make it really easy for you with previews of two leading Iron Mountain Narratives:

Fair Value: US$160.00

Implied discount vs current price: about 21.9% below this Fair Value

Revenue growth assumption: very large, around 6x

• Views Iron Mountain as a global information management REIT with deep roots in regulated sectors like healthcare, financial services, and government, where compliance needs create high switching costs.
• Sees the physical records storage business as a stable cash engine, with growing digital services and data centers adding new potential revenue pillars over time.
• Emphasizes the mix of recurring revenue, long contracts, and cross selling across storage, digital transformation, and data centers as support for the Fair Value of about US$160.

Fair Value: about US$73.00

Implied premium vs current price: about 71.3% above this Fair Value

Revenue growth assumption: 5.75%

• Assumes cloud adoption and digital transformation steadily erode demand for legacy physical storage, while competition in data centers and digital services puts pressure on margins.
• Highlights the ongoing capital needs of expanding data centers, along with ESG and sustainability requirements, as potential headwinds for free cash flow and financial flexibility.
• Ties the Fair Value of about US$73 to analyst assumptions for mid single digit revenue growth, higher profit margins over time, and a lower future P/E multiple than today, with limited room for execution missteps.

Both narratives rely on the same business facts but weigh the long term trade off between legacy storage, digital growth, capital intensity, and valuation very differently. Your own view on those trade offs will largely determine which Fair Value feels closer to your estimate.

To see how these results tie into long-term growth, risks, and valuation, check out the full range of community narratives for Iron Mountain on Simply Wall St. Add the company to your watchlist or portfolio so you'll be alerted when the story evolves.

Do you think there's more to the story for Iron Mountain? Head over to our Community to see what others are saying!

This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.