Iron Mountain Ownership | Who Owns Iron Mountain?
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 3.69% of its assets in Iron Mountain shares.
IRM Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Iron Mountain | 34.16% | 0.91% | 64.93% |
| Sector | Real Estate Stocks | 48.86% | 9.88% | 41.26% |
| Industry | Specialty REIT Stocks | 52.08% | 3.97% | 43.95% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Vanguard group | 46.63M | 15.76% | $3.87B |
| Blackrock funding, inc. /de | 33.02M | 11.08% | $3.37B |
| Blackrock | 27.89M | 9.53% | $2.50B |
| State street | 17.55M | 5.89% | $1.81B |
| Cohen & steers | 16.17M | 5.43% | $1.65B |
| Geode capital management | 8.49M | 2.85% | $863.70M |
| Fmr | 7.48M | 2.51% | $764.46M |
| Morgan stanley | 4.65M | 1.56% | $475.18M |
| Principal financial group | 4.57M | 1.53% | $466.38M |
| Dimensional fund advisors lp | 4.55M | 1.53% | $464.93M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Waterfront capital partners | 115.29K | 7.69% | $11.75M |
| Contour asset management | 1.44M | 4.80% | $147.57M |
| Vert asset management | 146.41K | 4.75% | $14.95M |
| B&i capital | 116.47K | 4.05% | $11.90M |
| Foresight capital management advisors | 68.29K | 3.88% | $6.97M |
| Marble harbor investment counsel | 300.47K | 3.33% | $30.69M |
| Digitalbridge group | 504.02K | 3.25% | $51.48M |
| Cohen & steers | 16.17M | 2.87% | $1.65B |
| Intrinsic edge capital management | 179.47K | 2.65% | $14.89M |
| Adelante capital management | 386.29K | 2.63% | $39.38B |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Blackrock | 27.89M | 0.06% | 4.78M |
| Norges bank | 4.45M | 0.04% | 4.45M |
| Vanguard fiduciary trust | 1.65M | 0.04% | 1.65M |
| Morgan stanley | 4.65M | 0.03% | 1.05M |
| Aqr capital management | 1.85M | 0.08% | 922.88K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Cohen & steers | 16.17M | 2.87% | -2.73M |
| Pictet asset management sa | 864.74K | 0.09% | -1.43M |
| Contour asset management | 1.44M | 4.80% | -1.39M |
| Citadel advisors | 374.95K | 0.01% | -744.42K |
| Vanguard group | 46.63M | 0.06% | -625.62K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Norges bank | 4.45M | 0.04% | 4.45M | $368.89M |
| Vanguard fiduciary trust | 1.65M | 0.04% | 1.65M | $168.83M |
| Jane street group | 707.44K | 0.01% | 707.44K | $72.26M |
| Vanguard global advisers | 647.77K | 0.04% | 647.77K | $66.16M |
| Vanguard asset management | 505.00K | 0.04% | 505.00K | $51.58M |
Sold Out
| Holder | Change |
|---|---|
| Pom investment strategies | -1.00 |
| Financial gravity asset management | -1.00 |
| Cape investment advisory | -1.00 |
| Mendota financial group | -1.00 |
| Murphy & mullick capital management | -1.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| 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% |
| Mar 31, 2025 | 996 | -8.03% | 240,406,567 | 1.52% | 81 | 1.25% | 417 | -13.13% | 397 | -3.64% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Vanguard Real Estate Index Investor | 10.97M | 3.69% | -35.92K |
| Vanguard US Total Market Shares ETF | 9.29M | 3.16% | 12.82K |
| Vanguard Total Stock Mkt Idx Inv | 8.96M | 3.01% | 21.81K |
| Vanguard Institutional 500 Index Trust | 8.35M | 2.83% | 58.03K |
| Vanguard 500 Index Investor | 7.67M | 2.58% | 137.52K |
| Vanguard Mid Cap Index Institutional | 6.08M | 2.05% | 13.39K |
| iShares Core S&P 500 ETF | 3.83M | 1.29% | 11.24K |
| Fidelity 500 Index | 3.78M | 1.27% | 16.30K |
| SPDR® S&P 500 ETF | 3.56M | 1.21% | -144.37K |
| SPDR® S&P 500® ETF Trust | 3.56M | 1.21% | -18.68K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Jun 01, 2026 | Meaney William L | President and CEO | Sell | $1.19M |
| Jun 01, 2026 | Meaney William L | President and CEO | Sell | $1.33M |
| Jun 01, 2026 | Meaney William L | President and CEO | Sell | $1.28M |
| Jun 01, 2026 | Meaney William L | President and CEO | Sell | $962.19K |
| Jun 01, 2026 | Meaney William L | President and CEO | Sell | $141.46K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q2 | - | 14 |
| 2026 Q1 | - | 30 |
| 2025 Q4 | 1 | 11 |
| 2025 Q3 | - | 13 |
| 2025 Q2 | - | 13 |
IRM Ownership FAQ
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