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Iron Mountain Ownership | Who Owns Iron Mountain?

OverviewForecastRevenueFinancialsChartTranscripts

Iron Mountain Ownership Summary

Iron Mountain is owned by 34.16% institutional investors, 0.91% insiders, and 64.93% 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 3.81% of its assets in Iron Mountain shares.

IRM Ownership Benchmark

TypeName% Inst% Insiders% Retail
StockIron Mountain34.16%0.91%64.93%
SectorReal Estate Stocks 49.59%9.70%40.71%
IndustrySpecialty REIT Stocks 51.75%1.92%46.33%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Vanguard group46.63M15.76%$3.87B
Blackrock funding, inc. /de33.02M11.08%$3.37B
Blackrock27.89M9.53%$2.50B
State street17.55M5.89%$1.81B
Cohen & steers16.17M5.43%$1.65B
Geode capital management8.49M2.85%$863.70M
Fmr7.48M2.51%$764.46M
Morgan stanley4.65M1.56%$475.18M
Principal financial group4.57M1.53%$466.38M
Dimensional fund advisors lp4.55M1.53%$464.93M

Top Institutional Shareholders by % of Total Assets

HolderShares% AssetsValue
Waterfront capital partners115.29K7.69%$11.75M
Vert asset management154.45K5.34%$19.51M
Contour asset management1.44M4.80%$147.57M
B&i capital116.47K4.05%$11.90M
Foresight capital management advisors59.64K3.66%$7.53M
Marble harbor investment counsel300.47K3.33%$30.69M
Digitalbridge group504.02K3.25%$51.48M
Cohen & steers16.17M2.87%$1.65B
Pensionfund dsm netherlands42.50K2.76%$5.37M
Pensionfund sabic20.30K2.74%$2.56M

Top Buyers

HolderShares% AssetsChange
Blackrock27.89M0.06%4.78M
Norges bank4.45M0.04%4.45M
Vanguard fiduciary trust1.65M0.04%1.65M
Morgan stanley4.65M0.03%1.05M
Aqr capital management1.85M0.08%922.88K

Top Sellers

HolderShares% AssetsChange
Cohen & steers16.17M2.87%-2.73M
Pictet asset management sa864.74K0.09%-1.43M
Contour asset management1.44M4.80%-1.39M
Citadel advisors374.95K0.01%-744.42K
Vanguard group46.63M0.06%-625.62K

New Positions

HolderShares% AssetsChangeValue
Norges bank4.45M0.04%4.45M$368.89M
Vanguard fiduciary trust1.65M0.04%1.65M$168.83M
Jane street group707.44K0.01%707.44K$72.26M
Vanguard global advisers647.77K0.04%647.77K$66.16M
Vanguard asset management505.00K0.04%505.00K$51.58M

Sold Out

HolderChange
Murphy & mullick capital management-1.00
Financial gravity asset management-1.00
Mendota financial group-1.00
Pom investment strategies-1.00
Ross\johnson & associates-1.00

Institutional Ownership Trends

DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
Mar 31, 2026690-33.01%101,809,570-60.39%340.45%354-18.81%205-50.36%
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%

Top Mutual Funds Shareholders

HolderShares% HoldingChange
Vanguard Real Estate Index Investor11.32M3.81%173.41K
Vanguard US Total Market Shares ETF9.29M3.16%12.82K
Vanguard Total Stock Mkt Idx Inv8.98M3.02%28.25K
Vanguard Institutional 500 Index Trust8.35M2.83%58.03K
Vanguard 500 Index Investor7.73M2.60%-14.95K
Vanguard Mid Cap Index Institutional6.13M2.06%27.88K
iShares Core S&P 500 ETF4.11M1.38%12.97K
Fidelity 500 Index3.79M1.27%-5.29K
SPDR® S&P 500 ETF3.56M1.21%-144.37K
SPDR® S&P 500® ETF Trust3.56M1.21%-18.68K

Recent Insider Transactions

DateNameRoleActivityValue
Jul 01, 2026Meaney William L President and CEOSell$888.30K
Jul 01, 2026Meaney William L President and CEOSell$199.68K
Jul 01, 2026Meaney William L President and CEOSell$2.13M
Jul 01, 2026Meaney William L President and CEOSell$1.19M
Jul 01, 2026Meaney William L President and CEOSell$318.32K

Insider Transactions Trends

DateBuySell
2026 Q3-6
2026 Q2-14
2026 Q1-30
2025 Q4111
2025 Q3-13

IRM Ownership FAQ

Who Owns Iron Mountain?

Iron Mountain shareholders are primarily institutional investors at 34.16%, followed by 0.91% insiders and 64.93% retail investors. The average institutional ownership in Iron Mountain's industry, Specialty REIT Stocks , is 51.75%, which Iron Mountain falls below.

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 (33.02M shares, 11.08%), and Blackrock (27.89M shares, 9.53%). Together, they hold 36.37% 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?

Waterfront capital partners is Iron Mountain’s biggest shareholder by percentage of total assets invested, with 7.69% of its assets in 115.29K Iron Mountain shares, valued at 11.75M$.

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 3.81% of its total shares outstanding invested in 11.32M Iron Mountain shares.

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