​

Iron Mountain Ownership | Who Owns Iron Mountain?

OverviewForecastRevenueFinancialsChartTranscripts

Iron Mountain Ownership Summary

Iron Mountain is owned by 71.16% institutional investors, 0.78% insiders, and 28.06% retail investors. Vanguard group is the largest institutional shareholder, holding 15.76% of IRM shares. Vanguard Real Estate Index Investor is the top mutual fund, with 3.73% of its assets in Iron Mountain shares.

IRM Ownership Benchmark

TypeName% Inst% Insiders% Retail
StockIron Mountain71.16%0.78%28.06%
SectorReal Estate Stocks 42.56%9.05%48.39%
IndustrySpecialty REIT Stocks 53.72%3.97%42.31%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Vanguard group46.63M15.76%$3.87B
Blackrock funding, inc. /de32.92M11.13%$2.73B
Blackrock27.89M9.53%$2.50B
Cohen & steers18.90M6.39%$1.57B
State street17.13M5.80%$1.76B
Geode capital management8.29M2.80%$685.37M
Fmr7.86M2.66%$801.05M
Invesco5.07M1.72%$516.48M
Norges bank4.45M1.50%$368.89M
Dimensional fund advisors lp4.43M1.50%$367.42M

Top Institutional Shareholders by % of Total Assets

HolderShares% AssetsValue
Contour asset management3.17M8.09%$322.72M
Waterfront capital partners115.29K7.69%$11.75M
Vert asset management140.93K3.89%$11.69M
Foresight capital management advisors84.76K3.81%$7.03M
B&i capital114.72K3.38%$9.52M
Heitman real estate securities490.55K2.86%$40.69M
Cohen & steers18.90M2.83%$1.57B
Marble harbor investment counsel314.02K2.78%$26.05M
Intrinsic edge capital management179.47K2.65%$14.89M
Adelante capital management386.29K2.63%$39.38B

Top Buyers

HolderShares% AssetsChange
Blackrock27.89M0.06%4.78M
Norges bank4.45M0.04%4.45M
Cohen & steers18.90M2.83%3.16M
Principal financial group4.21M0.18%1.68M
Blackrock funding, inc. /de32.92M0.05%1.21M

Top Sellers

HolderShares% AssetsChange
Ubs asset management americas2.08K--3.16M
Citadel advisors---1.27M
Wellington management group llp248.89K0.00%-1.25M
Ubs group795.91K0.01%-640.39K
Vanguard group46.63M0.06%-625.62K

New Positions

HolderShares% AssetsChangeValue
Norges bank4.45M0.04%4.45M$368.89M
Americana partners241.35K0.55%241.35K$20.02M
Cibc world markets115.46K0.05%115.46K$9.58M
Axa investment managers113.35K0.03%113.35K$11.55M
Summit partners public asset management85.00K0.18%85.00K$8.66M

Sold Out

HolderChange
Mendota financial group-1.00
Financial gravity asset management-1.00
Cape investment advisory-1.00
Westend advisors-2.00
Country trust bank-2.00

Institutional Ownership Trends

DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
Dec 31, 2025788-24.45%210,478,230-15.82%710.99%318-29.33%325-15.14%
Sep 30, 2025898-14.96%219,243,090-9.07%741.11%385-24.21%329-6.00%
Jun 30, 20251,0584.65%248,166,6213.56%841.27%50618.50%353-11.75%
Mar 31, 2025996-8.03%240,406,5671.52%811.25%417-13.13%397-3.64%
Dec 31, 2024781-27.82%190,161,466-20.39%640.98%327-31.30%315-24.82%

Top Mutual Funds Shareholders

HolderShares% HoldingChange
Vanguard Real Estate Index Investor11.02M3.73%33.35K
Vanguard US Total Market Shares ETF9.29M3.16%12.82K
Vanguard Total Stock Mkt Idx Inv8.84M2.99%19.31K
Vanguard Institutional 500 Index Trust8.35M2.83%58.03K
Vanguard 500 Index Investor7.53M2.55%46.77K
Vanguard Mid Cap Index Institutional6.08M2.06%-31.80K
iShares Core S&P 500 ETF3.76M1.27%730.82K
Fidelity 500 Index3.74M1.26%8.15K
SPDR® S&P 500 ETF3.56M1.21%-144.37K
SPDR® S&P 500® ETF Trust3.56M1.21%-18.68K

Recent Insider Transactions

DateNameRoleActivityValue
Mar 05, 2026Meaney William L President and CEOSell$4.07M
Mar 05, 2026Meaney William L President and CEOSell$3.65M
Mar 05, 2026Meaney William L President and CEOSell$2.77M
Mar 03, 2026Meaney William L President and CEOSell$2.48M
Mar 03, 2026Meaney William L President and CEOSell$1.95M

Insider Transactions Trends

DateBuySell
2026 Q1-22
2025 Q4111
2025 Q3-13
2025 Q2-13
2025 Q1-21

IRM Ownership FAQ

Who Owns Iron Mountain?

Iron Mountain shareholders are primarily institutional investors at 71.16%, followed by 0.78% insiders and 28.06% retail investors. The average institutional ownership in Iron Mountain's industry, Specialty REIT Stocks , is 53.72%, which Iron Mountain exceeds.

Who owns the most shares of Iron Mountain?

Iron Mountain’s largest shareholders are Vanguard group (46.63M shares, 15.76%), Blackrock funding, inc. /de (32.92M shares, 11.13%), and Blackrock (27.89M shares, 9.53%). Together, they hold 36.42% of Iron Mountain’s total shares outstanding.

Does Blackrock own Iron Mountain?

Yes, BlackRock owns 9.53% of Iron Mountain, totaling 27.89M shares as of Jun 2024. This represents 0.06% of BlackRock's total assets, with a market value of 2.5B$. In the last quarter, BlackRock increased its holdings by 4.78M shares, a 20.70% change.

Who is Iron Mountain’s biggest shareholder by percentage of total assets invested?

Contour asset management is Iron Mountain’s biggest shareholder by percentage of total assets invested, with 8.09% of its assets in 3.17M Iron Mountain shares, valued at 322.72M$.

Who is the top mutual fund holder of Iron Mountain shares?

Vanguard Real Estate Index Investor is the top mutual fund holder of Iron Mountain shares, with 3.73% of its total shares outstanding invested in 11.02M Iron Mountain shares.

Try Tickergate Pro Free

Customize Everything. 100% Flexibility. Fast and Easy to Use (No code or Excel Needed)

  • Customize your own personal stocks lists, views and charts

  • Choose from hundreds of fields, up to 15 years of history

  • Conduct deep comparison analysis

  • Discover trending investment themes

  • Find your next best investment

  • Research stocks using tools