Stocks / IRM / Shares Outstanding

Iron Mountain Incorporated Shares Outstanding 2008–2025

Iron Mountain Incorporated reported 295.8M of shares outstanding for fiscal 2025. That was 0.7% higher than fiscal 2024. Compared with fiscal 2020, the change was +2.6%. A rising share count can dilute per-share ownership; the filings should be checked for issuance and stock-compensation details.

Latest filed value
295.8M
One-year change
+0.7%
Change since 2020
+2.6%
Latest period end
2025-12-31
Iron Mountain Incorporated Shares Outstanding history from 2008 to 2025FY 2008: 201931332FY 2009: 203546757FY 2010: 200064066FY 2011: 186256525FY 2012: 205586263FY 2013: 207123927FY 2014: 209818812FY 2015: 211340296FY 2016: 263682670FY 2017: 283110183FY 2018: 286321009FY 2019: 287299645FY 2020: 288273049FY 2021: 289757061FY 2022: 290830296FY 2023: 292142739FY 2024: 293592637FY 2025: 295788645
Annual filed history. Hover chart points for raw values; the accessible table below is the source of record.
Fiscal yearShares OutstandingChange (YoY)
FY 2025295.8M+0.7%
FY 2024293.6M+0.5%
FY 2023292.1M+0.5%
FY 2022290.8M+0.4%
FY 2021289.8M+0.5%
FY 2020288.3M+0.3%
FY 2019287.3M+0.3%
FY 2018286.3M+1.1%
FY 2017283.1M+7.4%
FY 2016263.7M+24.8%
FY 2015211.3M+0.7%
FY 2014209.8M+1.3%
FY 2013207.1M+0.7%
FY 2012205.6M+10.4%
FY 2011186.3M-6.9%
FY 2010200.1M-1.7%
FY 2009203.5M+0.8%
FY 2008201.9M—

Source: Iron Mountain Incorporated SEC filings — balance sheet (10-K), split-adjusted. Computed deterministically; refreshed nightly (last updated August 2, 2026). Open IRM 10-K filings at SEC EDGAR · Methodology · Download CSV.

How to read this history

Iron Mountain Incorporated reported 295.8M of shares outstanding for fiscal 2025. That was 0.7% higher than fiscal 2024. Compared with fiscal 2020, the change was +2.6%. A rising share count can dilute per-share ownership; the filings should be checked for issuance and stock-compensation details. Values remain missing when the cached filing does not disclose a comparable line item; they are never estimated. Stock splits, reorganizations and fiscal-calendar changes can reduce comparability.

Prepared and reviewed by the stockportfolio.pro research desk. Corrections: support@stockportfolio.pro.

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Iron Mountain Incorporated — frequently asked questions

What is Iron Mountain Incorporated's shares outstanding?

Iron Mountain Incorporated (IRM) reported shares outstanding of 295.8M for fiscal year 2025, per its SEC filings.

How has Iron Mountain Incorporated's shares outstanding changed over time?

Between fiscal 2008 and 2025, IRM's shares outstanding grew at roughly 2.3% per year (compound annual rate), from 201.9M to 295.8M.

Where does this data come from?

Figures are computed from Iron Mountain Incorporated's official SEC filings (balance sheet (10-K), split-adjusted), refreshed nightly. Not investment advice.

More IRM financial history

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