Iron Mountain Incorporated logo
IRMIron Mountain Incorporated

Shares Outstanding: 298.83M

popular:market cap|pe ratio|revenue|price history|total return

The shares outstanding is 298.83M. It is above its 12-month average by 0.43% (297.56M).

Market Cap|Share Buybacks|EPS|All Metrics
Shares Outstanding

IRM Shares Outstanding

298.83M

Reported quarterly weighted average share count; no daily interpolation.

+2.66% 5Y
IRM Shares Outstanding

IRM Average Shares Outstanding Chart

IRM Shares Outstanding

IRM Current vs Average Shares Outstanding Chart

IRM Shares Outstanding Metrics

SHARES OUTSTANDING

298.83M

SHARES OUTSTANDING AVG TTM

297.56M

SHARES OUTSTANDING AVG 3Y

295.74M

SHARES OUTSTANDING AVG 5Y

294.20M

SHARES OUTSTANDING AVG 10Y

291.61M

SHARES OUTSTANDING AVG 15Y

255.38M

SHARES OUTSTANDING AVG 20Y

242.26M

CURRENT VS TTM AVG

+0.43%

CURRENT VS 3Y AVG

+1.05%

CURRENT VS 5Y AVG

+1.57%

CURRENT VS 10Y AVG

+2.48%

CURRENT VS 15Y AVG

+17.02%

CURRENT VS 20Y AVG

+23.35%

Share Structure

Shares Outstanding

295.40M

Float Shares

N/A

Stock Price

$132.44

Market Cap

$39.4B

Quarterly Shares Outstanding History

PeriodWeighted Average SharesQoQ Change
Q1 2026298.83M+0.15%
Q4 2025298.38M+0.13%
Q3 2025297.98M+0.89%
Q2 2025295.36M-0.64%
Q1 2025297.26M+0.35%
Q4 2024296.23M+0.90%
Q3 2024293.60M-0.76%
Q2 2024295.84M+0.21%
Q1 2024295.22M+0.07%
Q4 2023295.01M+0.25%
Q3 2023294.27M+0.25%
Q2 2023293.53M+0.16%
Q1 2023293.05M+0.05%
Q4 2022292.89M+0.12%
Q3 2022292.55M+0.02%
Q2 2022292.49M+0.22%
Q1 2022291.85M+0.01%
Q4 2021291.81M+0.11%
Q3 2021291.48M+0.14%
Q2 2021291.08M+0.54%
Q1 2021289.53M+0.13%
Q4 2020289.16M+0.12%
Q3 2020288.81M+0.26%
Q2 2020288.07M-0.10%
Q1 2020288.36M+0.10%
Q4 2019288.08M+0.14%
Q3 2019287.69M+0.07%
Q2 2019287.48M-0.00%
Q1 2019287.49M+0.34%
Q4 2018286.53M-0.16%
Q3 2018286.98M+0.14%
Q2 2018286.57M+0.20%
Q1 2018285.99M+0.26%
Q4 2017285.26M+7.18%
Q3 2017266.14M+0.46%
Q2 2017264.93M+0.05%
Q1 2017264.81M+0.36%
Q4 2016263.86M-0.24%
Q3 2016264.50M+7.35%
Q2 2016246.39M+15.96%
Q1 2016212.47M+0.45%
Q4 2015211.53M-0.18%
Q3 2015211.92M-0.08%
Q2 2015212.08M-0.08%
Q1 2015212.25M+0.96%
Q4 2014210.24M+7.87%
Q3 2014194.91M+0.71%
Q2 2014193.53M+0.24%
Q1 2014193.07M+0.62%
Q4 2013191.88M-0.20%
Q3 2013192.27M-0.16%
Q2 2013192.57M+0.24%
Q1 2013192.11M+5.57%
Q4 2012181.97M+5.15%
Q3 2012173.05M+0.47%
Q2 2012172.23M+0.00%
Q1 2012172.22M+0.53%
Q4 2011171.32M-12.91%
Q3 2011196.72M-3.24%
Q2 2011203.31M+1.02%
Q1 2011201.25M+0.51%
Q4 2010200.23M-0.51%
Q3 2010201.25M-1.45%
Q2 2010204.21M-0.24%
Q1 2010204.71M+0.55%
Q4 2009203.58M-0.64%
Q3 2009204.89M+0.34%
Q2 2009204.20M+0.44%
Q1 2009203.31M+0.62%
Q4 2008202.07M-0.71%
Q3 2008203.52M+0.24%
Q2 2008203.04M-0.19%
Q1 2008203.42M+1.27%
Q4 2007200.87M-0.61%
Q3 2007202.11M+0.18%
Q2 2007201.74M+0.16%
Q1 2007201.42M+1.10%
Q4 2006199.23M-0.68%
Q3 2006200.59M+0.21%
Q2 2006200.17M+0.10%
Q1 2006199.97M+1.24%
Q4 2005197.52M-0.46%
Q3 2005198.42M+0.62%
Q2 2005197.21M-0.04%
Q1 2005197.28M+1.18%
Q4 2004194.97M-1.05%
Q3 2004197.05M+0.25%
Q2 2004196.55M+0.21%
Q1 2004196.15M+1.72%
Q4 2003192.84M-1.18%
Q3 2003195.13M-0.08%
Q2 2003195.28M+0.28%
Q1 2003194.74M+1.71%
Q4 2002191.47M-0.95%
Q3 2002193.30M-0.19%
Q2 2002193.68M-

Relationship: Market Cap = Shares Outstanding × Stock Price

Key concepts:

  • Float shares: Shares available for public trading
  • Dilution: When new shares are issued, existing shareholders own less
  • Buybacks: Reduce share count, increasing EPS and ownership stake
  • Stock splits: Increase share count but don't change market cap

Shares Outstanding Formula & Definition

Shares Outstanding represents the reported weighted average share count used for per-share metrics. Changes in share count affect EPS and ownership dilution.

Expanded definitions: Investopedia, Wikipedia, Corporate Finance Institute

Shares Outstanding FAQ

What is the shares outstanding for Iron Mountain Incorporated (IRM)?
The shares outstanding for IRM stock is 298.83M.
What is the TTM average shares outstanding for Iron Mountain Incorporated (IRM)?
The TTM average shares outstanding for IRM stock is 297.56M.
What is the 3Y average shares outstanding for Iron Mountain Incorporated (IRM)?
The 3Y average shares outstanding for IRM stock is 295.74M.
What is the 5Y average shares outstanding for Iron Mountain Incorporated (IRM)?
The 5Y average shares outstanding for IRM stock is 294.20M.
What is the 10Y average shares outstanding for Iron Mountain Incorporated (IRM)?
The 10Y average shares outstanding for IRM stock is 291.61M.
What is the 15Y average shares outstanding for Iron Mountain Incorporated (IRM)?
The 15Y average shares outstanding for IRM stock is 255.38M.
What is the 20Y average shares outstanding for Iron Mountain Incorporated (IRM)?
The 20Y average shares outstanding for IRM stock is 242.26M.

IRM Shares Outstanding History

DATESHARES OUTSTANDING
2026-03-31298.83M
2025-12-31298.38M
2025-09-30297.98M
2025-06-30295.36M
2025-03-31297.26M
2024-12-31296.23M
2024-09-30293.60M
2024-06-30295.84M
2024-03-31295.22M
2023-12-31295.01M
2023-09-30294.27M
2023-06-30293.53M
2023-03-31293.05M
2022-12-31292.89M
2022-09-30292.55M
2022-06-30292.49M
2022-03-31291.85M
2021-12-31291.81M
2021-09-30291.48M
2021-06-30291.08M
2021-03-31289.53M
2020-12-31289.16M
2020-09-30288.81M
2020-06-30288.07M
2020-03-31288.36M
2019-12-31288.08M
2019-09-30287.69M
2019-06-30287.48M
2019-03-31287.49M
2018-12-31286.53M
2018-09-30286.98M
2018-06-30286.57M
2018-03-31285.99M
2017-12-31285.26M
2017-09-30266.14M
2017-06-30264.93M
2017-03-31264.81M
2016-12-31263.86M
2016-09-30264.50M
2016-06-30246.39M
2016-03-31212.47M
2015-12-31211.53M
2015-09-30211.92M
2015-06-30212.08M
2015-03-31212.25M
2014-12-31210.24M
2014-09-30194.91M
2014-06-30193.53M
2014-03-31193.07M
2013-12-31191.88M
2013-09-30192.27M
2013-06-30192.57M
2013-03-31192.11M
2012-12-31181.97M
2012-09-30173.05M
2012-06-30172.23M
2012-03-31172.22M
2011-12-31171.32M
2011-09-30196.72M
2011-06-30203.31M
2011-03-31201.25M
2010-12-31200.23M
2010-09-30201.25M
2010-06-30204.21M
2010-03-31204.71M
2009-12-31203.58M
2009-09-30204.89M
2009-06-30204.20M
2009-03-31203.31M
2008-12-31202.07M
2008-09-30203.52M
2008-06-30203.04M
2008-03-31203.42M
2007-12-31200.87M
2007-09-30202.11M
2007-06-30201.74M
2007-03-31201.42M
2006-12-31199.23M
2006-09-30200.59M
2006-06-30200.17M
2006-03-31199.97M
2005-12-31197.52M
2005-09-30198.42M
2005-06-30197.21M
2005-03-31197.28M
2004-12-31194.97M
2004-09-30197.05M
2004-06-30196.55M
2004-03-31196.15M
2003-12-31192.84M
2003-09-30195.13M
2003-06-30195.28M
2003-03-31194.74M
2002-12-31191.47M
2002-09-30193.30M
2002-06-30193.68M

Related Metrics

Market CapShare BuybacksEPSAll Metrics

About Iron Mountain Incorporated

Established in 1951, Iron Mountain Incorporated (NYSE: IRM) has become the world's foremost authority in storage and information management solutions. More than 225,000 organizations globally trust Iron Mountain with their critical assets. With an extensive physical infrastructure spanning over 90 million square feet, the company operates approximately 1,450 facilities in around 50 countries. Within this vast network, Iron Mountain safeguards billions of valued items, including vital corporate records, highly confidential digital assets, and invaluable cultural and historical artifacts. Their comprehensive suite of offerings encompasses secure document archiving, robust information governance, digital transformation initiatives, confidential destruction services, along with advanced data centers, cloud computing solutions, and specialized art storage and logistics. These services empower clients to mitigate costs and risks, ensure regulatory compliance, facilitate swift disaster recovery, and enable a more efficient, digital-first operational model.

Portsmouth, NH
28,850 employees
www.ironmountain.com
Real Estate / REIT - Specialty
Sector
Real Estate
Industry
REIT - Specialty
CEO
William L. Meaney
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