Iron Mountain Ownership | Who Owns Iron Mountain?
Iron Mountain Ownership Summary
Iron Mountain is owned by 87.73% institutional investors, 0.89% insiders, and 11.39% 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 3.80% of its assets in Iron Mountain shares.
IRM Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Iron Mountain | 87.73% | 0.89% | 11.39% |
| Sector | Real Estate Stocks | 73.63% | 9.57% | 16.80% |
| Industry | Specialty REIT Stocks | 86.19% | 5.30% | 8.52% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Vanguard group | 46.63M | 15.76% | $3.87B |
| Blackrock funding, inc. /de | 33.57M | 11.31% | $4.24B |
| Blackrock | 27.89M | 9.53% | $2.50B |
| Vanguard capital management | 18.95M | 6.38% | $2.39B |
| State street | 17.63M | 5.94% | $2.24B |
| Cohen & steers | 12.02M | 4.05% | $1.52B |
| Geode capital management | 8.65M | 2.91% | $1.09B |
| Fmr | 7.87M | 2.65% | $994.36M |
| Dimensional fund advisors lp | 4.63M | 1.56% | $584.31M |
| Morgan stanley | 4.43M | 1.49% | $559.16M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Waterfront capital partners | 115.29K | 7.69% | $11.75M |
| Vert asset management | 154.45K | 5.34% | $19.51M |
| Contour asset management | 1.27M | 3.81% | $161.01M |
| Marble harbor investment counsel | 295.53K | 3.79% | $37.33M |
| B&i capital | 13.54K | 3.77% | $1.71M |
| Foresight capital management advisors | 59.64K | 3.66% | $7.53M |
| Digitalbridge group | 457.13K | 3.46% | $57.74M |
| O'neil global advisors | 113.16K | 3.20% | $14.29M |
| Ar asset management | 130.60K | 3.02% | $16.50M |
| Heitman real estate securities | 357.72K | 2.90% | $45.18M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Blackrock | 27.89M | 0.06% | 4.78M |
| Sixth street partners management company | 4.26M | 0.07% | 4.26M |
| Norges bank | 4.21M | 0.05% | 4.21M |
| Ubs asset management americas | 3.19M | 0.07% | 3.18M |
| Nuveen asset management | 2.55M | 0.08% | 715.02K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Cohen & steers | 12.02M | 2.40% | -4.15M |
| Daiwa securities group | 1.86M | 0.46% | -1.25M |
| Pggm investments | 675.09K | 2.10% | -694.90K |
| Capital world investors | 1.22M | 0.02% | -650.00K |
| Vanguard group | 46.63M | 0.06% | -625.62K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Sixth street partners management company | 4.26M | 0.07% | 4.26M | $538.52M |
| Norges bank | 4.21M | 0.05% | 4.21M | $532.36M |
| Voloridge investment management | 412.75K | 0.22% | 412.75K | $52.13M |
| Summit partners public asset management | 235.57K | 0.52% | 235.57K | $29.75M |
| Gillson capital lp | 137.93K | 1.03% | 137.93K | $17.42M |
Sold Out
| Holder | Change |
|---|---|
| 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
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Jun 30, 2026 | 1,191 | 6.72% | 260,416,776 | 3.02% | 87 | 1.21% | 595 | 1.71% | 383 | 10.37% |
| Mar 31, 2026 | 690 | -33.01% | 101,809,570 | -60.39% | 34 | 0.45% | 354 | -18.81% | 205 | -50.36% |
| Dec 31, 2025 | 788 | -24.45% | 210,478,230 | -15.82% | 71 | 0.99% | 318 | -29.33% | 325 | -15.14% |
| Sep 30, 2025 | 898 | -14.96% | 219,243,090 | -9.07% | 74 | 1.11% | 385 | -24.21% | 329 | -6.00% |
| Jun 30, 2025 | 1,058 | 4.65% | 248,166,621 | 3.56% | 84 | 1.27% | 506 | 18.50% | 353 | -11.75% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Vanguard Real Estate Index Investor | 11.32M | 3.80% | -5.68K |
| Vanguard US Total Market Shares ETF | 9.29M | 3.16% | 12.82K |
| Vanguard MStar Total Stk Mkt Idx Invest | 9.00M | 3.02% | 26.20K |
| Vanguard Total Stock Mkt Idx Inv | 8.98M | 3.02% | 28.25K |
| Vanguard Morn Total Stk Mkt Idx Investor | 8.98M | 3.02% | 28.25K |
| Vanguard Institutional 500 Index Trust | 8.35M | 2.83% | 58.03K |
| Vanguard 500 Index Investor | 7.81M | 2.62% | 81.69K |
| Vanguard Mid Cap Index Institutional | 6.13M | 2.06% | 27.88K |
| Vanguard Morn Mid Cap Index Instl | 6.13M | 2.06% | 27.88K |
| Vanguard MStar Mid Cap Index Instl | 6.12M | 2.05% | -8.20K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Sep 01, 2026 | Meaney William L | President and CEO | Sell | $10.32K |
| Sep 01, 2026 | Meaney William L | President and CEO | Sell | $1.29M |
| Sep 01, 2026 | Meaney William L | President and CEO | Sell | $2.39M |
| Sep 01, 2026 | Meaney William L | President and CEO | Sell | $701.62K |
| Sep 01, 2026 | McIntosh Greg W | EVP, Chief Commercial Officer | Sell | $578.00K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q3 | - | 17 |
| 2026 Q2 | - | 14 |
| 2026 Q1 | - | 30 |
| 2025 Q4 | 1 | 11 |
| 2025 Q3 | - | 13 |
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