IRON MTN INC DEL (IRM)
Institutional ownership reported to the SEC as of Q2 2026, across 31 quarters.
1,105
Reporting holders
$31.3B
Reported value
82.0%
Of shares outstanding
1.6%
Held as options
+75
Holder change
Institutions report 244,113,943 shares against 297,702,812 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| BlackRock, Inc. | $4.2B | 33,570,910 | 0.06% | 8q | +1.7%+$69.4M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $3.2B | 25,568,944 | 0.15% | 2q | +2.2%+$69.9M |
| VANGUARD CAPITAL MANAGEMENT LLC | $2.4B | 18,953,705 | 0.05% | 2q | +1.0%+$24.6M |
| STATE STREET CORP | $2.2B | 17,634,044 | 0.07% | 31q | HELD |
| GEODE CAPITAL MANAGEMENT, LLC | $1.1B | 8,649,249 | 0.06% | 31q | +1.9%+$20.5M |
| FMR LLC | $994.4M | 7,872,365 | 0.04% | 31q | +5.2%+$49.0M |
| DIMENSIONAL FUND ADVISORS LP | $584.3M | 4,625,684 | 0.11% | 31q | +1.6%+$9.3M |
| MORGAN STANLEY | $559.2M | 4,426,922 | 0.03% | 35q | -4.8%-$28.5M |
| PRINCIPAL FINANCIAL GROUP INC | $552.4M | 4,373,424 | 0.27% | 31q | -4.2%-$24.3M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $538.5M | 4,263,487 | 0.07% | 31q | +6.2%+$31.6M |
| Sixth Street Partners Management Company, L.P. | $538.5M | 4,263,487 | 0.07% | new | NEW |
| NORTHERN TRUST CORP | $533.4M | 4,222,967 | 0.06% | 31q | +1.7%+$9.2M |
| NORGES BANK | $532.4M | 4,214,697 | 0.05% | 32q | -5.2%-$29.4M |
| Invesco Ltd. | $513.5M | 4,065,649 | 0.04% | 31q | +3.7%+$18.2M |
| Legal & General Group Plc | $409.8M | 3,244,741 | 0.09% | 31q | +3.5%+$13.9M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $403.4M | 3,193,560 | 0.07% | 31q | +29674.0%+$402.0M |
| DEUTSCHE BANK AG\ | $385.1M | 3,049,079 | 0.11% | 34q | -1.4%-$5.4M |
| DUFF & PHELPS INVESTMENT MANAGEMENT CO | $367.7M | 2,910,870 | 1.73% | 12q | -7.6%-$30.3M |
| GOLDMAN SACHS GROUP INC | $356.5M | 2,822,732 | 0.03% | 31q | +27.3%+$76.6M |
| CENTERSQUARE INVESTMENT MANAGEMENT LLC | $293.5M | 2,323,974 | 2.51% | 14q | +0.6%+$1.8M |
| JPMORGAN CHASE & CO | $287.5M | 2,212,137 | 0.02% | 31q | +4.2%+$11.5M |
| Nuveen, LLC | $280.3M | 2,218,771 | 0.07% | 6q | +7.3%+$19.0M |
| AQR CAPITAL MANAGEMENT LLC | $266.5M | 2,127,095 | 0.09% | 31q | +15.2%+$35.2M |
| PRUDENTIAL FINANCIAL INC | $249.3M | 1,974,079 | 0.27% | 31q | -18.3%-$55.8M |
| Vontobel Holding Ltd. | $242.5M | 1,919,656 | 0.77% | 4q | -9.3%-$24.9M |
| Daiwa Securities Group Inc. | $235.1M | 1,861,547 | 0.46% | 31q | -40.1%-$157.4M |
| Select Equity Group, L.P. | $219.4M | options only | 1.09% | 2q | OPTIONS |
| ROYAL BANK OF CANADA | $214.8M | 1,640,511 | 0.03% | 31q | +16.3%+$30.1M |
| AMERIPRISE FINANCIAL INC | $210.9M | 1,668,337 | 0.04% | 31q | -54.9%-$257.1M |
| VANGUARD FIDUCIARY TRUST CO | $209.5M | 1,658,635 | 0.05% | 2q | HELD |
| Bank of New York Mellon Corp | $202.1M | 1,600,078 | 0.03% | 31q | -1.5%-$3.1M |
| Russell Investments Group, Ltd. | $177.4M | 1,403,623 | 0.16% | 31q | -3.5%-$6.5M |
| HSBC HOLDINGS PLC | $170.3M | 1,347,871 | 0.07% | 31q | +5.9%+$9.5M |
| Contour Asset Management LLC | $161.0M | 1,274,684 | 3.81% | 6q | -11.8%-$21.5M |
| Capital World Investors | $153.7M | 1,217,169 | 0.02% | 31q | -34.8%-$82.1M |
| Amundi | $147.6M | 1,168,430 | 0.04% | 21q | +7.0%+$9.7M |
| AMERICAN CENTURY COMPANIES INC | $145.8M | 1,154,487 | 0.06% | 24q | +41.5%+$42.8M |
| BANK OF AMERICA CORP /DE/ | $141.3M | 1,118,827 | 0.01% | 31q | -20.0%-$35.4M |
| CBRE INVESTMENT MANAGEMENT LISTED REAL ASSETS LLC | $135.5M | 1,072,881 | 1.89% | 8q | -13.3%-$20.8M |
| Mitsubishi UFJ Asset Management Co., Ltd. | $124.1M | 982,596 | 0.07% | 31q | +8.2%+$9.4M |
| UBS Group AG | $116.5M | 915,101 | 0.01% | 31q | +14.2%+$14.5M |
| Sumitomo Mitsui Trust Group, Inc. | $113.2M | 896,560 | 0.06% | 31q | -4.0%-$4.7M |
| Swiss National Bank | $106.0M | 839,061 | 0.06% | 31q | -3.3%-$3.6M |
| Pictet Asset Management Holding SA | $103.3M | 817,622 | 0.10% | 12q | -5.4%-$6.0M |
| CIBC Bancorp USA Inc. | $98.2M | 777,480 | 0.12% | 3q | -6.2%-$6.5M |
| BARCLAYS PLC | $93.9M | 743,343 | 0.02% | 31q | +10.3%+$8.8M |
| WELLS FARGO & COMPANY/MN | $92.1M | 662,157 | 0.01% | 31q | -49.7%-$91.1M |
| SEI INVESTMENTS CO | $88.1M | 697,737 | 0.08% | 31q | -28.4%-$35.0M |
| Aberdeen Group plc | $87.3M | 691,514 | 0.12% | 31q | +86.3%+$40.5M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $86.2M | 23,476 | 0.01% | 31q | -77.0%-$288.7M |
| APG Asset Management US Inc. | $85.8M | 703,912 | 0.60% | 9q | HELD |
| BNP PARIBAS FINANCIAL MARKETS | $81.9M | 648,227 | 0.03% | 31q | +27.5%+$17.6M |
| Vanguard Global Advisers, LLC | $81.1M | 641,901 | 0.04% | 2q | -0.9%-$741.9K |
| LPL Financial LLC | $80.9M | 640,383 | 0.02% | 31q | +3.1%+$2.4M |
| Welch & Forbes LLC | $80.8M | 639,322 | 0.98% | 31q | -2.0%-$1.6M |
| CITADEL ADVISORS LLC | $79.4M | 343,168 | 0.01% | 31q | -8.5%-$7.4M |
| Universal- Beteiligungs- und Servicegesellschaft mbH | $77.1M | 610,889 | 0.12% | 7q | +3.5%+$2.6M |
| Quantinno Capital Management LP | $74.6M | 590,647 | 0.09% | 11q | +83.4%+$33.9M |
| NOMURA ASSET MANAGEMENT CO LTD | $74.3M | 588,384 | 0.16% | 31q | +4.4%+$3.2M |
| JANE STREET GROUP, LLC | $73.3M | 396,541 | 0.01% | 30q | -43.9%-$57.4M |
| RHUMBLINE ADVISERS | $72.4M | 573,267 | 0.05% | 31q | -0.9%-$666.4K |
| VANGUARD ASSET MANAGEMENT, Ltd | $71.9M | 568,845 | 0.05% | 2q | +12.6%+$8.1M |
| RAYMOND JAMES FINANCIAL INC | $70.9M | 561,539 | 0.02% | 7q | +90.3%+$33.6M |
| Asset Management One Co., Ltd. | $70.1M | 554,607 | 0.18% | 31q | +1.3%+$901.0K |
| California Public Employees Retirement System | $70.0M | 553,872 | 0.04% | 31q | +10.2%+$6.5M |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | $69.7M | 552,190 | 0.10% | 3q | -5.9%-$4.4M |
| WORLDQUANT MILLENNIUM ADVISORS LLC | $67.8M | 537,162 | 0.23% | 6q | -2.0%-$1.4M |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | $67.6M | 535,152 | 0.09% | 31q | -9.3%-$6.9M |
| WELLINGTON MANAGEMENT GROUP LLP | $64.8M | 512,906 | 0.01% | 31q | +47.4%+$20.8M |
| Clark Capital Management Group, Inc. | $60.2M | 476,766 | 0.33% | 2q | +1.8%+$1.1M |
| DigitalBridge Group, Inc. | $57.7M | 457,126 | 3.46% | 2q | -9.3%-$5.9M |
| ALLIANCEBERNSTEIN L.P. | $57.5M | 562,711 | 0.02% | 31q | HELD |
| National Pension Service | $57.4M | 454,815 | 0.04% | 20q | +5.9%+$3.2M |
| BANK OF MONTREAL /CAN/ | $57.3M | 453,715 | 0.02% | 31q | +11.7%+$6.0M |
| Corient Private Wealth LP | $57.1M | 451,815 | 0.04% | 15q | +112.8%+$30.3M |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | $56.1M | 443,901 | 0.08% | 10q | +106.6%+$28.9M |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO | $53.4M | 422,586 | 0.16% | 31q | HELD |
| CITIGROUP INC | $53.4M | 422,524 | 0.02% | 31q | +33.9%+$13.5M |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC | $52.1M | 412,748 | 0.22% | new | NEW |
| Rockefeller Capital Management L.P. | $49.5M | 391,620 | 0.08% | 31q | +0.6%+$313.3K |
| Heitman Real Estate Securities LLC | $45.2M | 357,721 | 2.90% | 12q | +37.8%+$12.4M |
| Vanguard Investments Australia, Ltd. | $43.9M | 347,312 | 0.11% | 2q | +1.2%+$502.5K |
| Adelante Capital Management LLC | $41.1M | 325,641 | 2.70% | 14q | -8.8%-$4.0M |
| ADELL HARRIMAN & CARPENTER INC | $40.0M | 316,465 | 2.05% | 31q | HELD |
| BAMCO INC /NY/ | $39.2M | 310,721 | 0.06% | 2q | -40.8%-$27.1M |
| Robeco Institutional Asset Management B.V. | $37.6M | 297,899 | 0.05% | 36q | +1940.0%+$35.8M |
| TEACHER RETIREMENT SYSTEM OF TEXAS | $37.6M | 297,427 | 0.10% | 25q | -24.6%-$12.3M |
| Marble Harbor Investment Counsel, LLC | $37.3M | 295,533 | 3.79% | 31q | -1.6%-$624.1K |
| NEUBERGER BERMAN GROUP LLC | $36.7M | 290,384 | 0.02% | 31q | -19.5%-$8.9M |
| Swedbank AB | $36.3M | 287,064 | 0.03% | 21q | +10.3%+$3.4M |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS | $36.2M | 286,428 | 0.18% | 31q | +41.6%+$10.6M |
| MACQUARIE GROUP LTD | $34.9M | 275,969 | 0.15% | 32q | +2.0%+$676.1K |
| VICTORY CAPITAL MANAGEMENT INC | $33.9M | 268,209 | 0.02% | 31q | +12.6%+$3.8M |
| Apollo Management Holdings, L.P. | $33.5M | 265,539 | 0.38% | 3q | HELD |
| AVIVA PLC | $32.9M | 260,627 | 0.05% | 31q | -1.0%-$325.0K |
| STIFEL FINANCIAL CORP | $32.8M | 259,638 | 0.03% | 31q | +1.7%+$541.9K |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM | $32.5M | 257,566 | 0.05% | 31q | -1.9%-$625.1K |
| Cetera Investment Advisers | $32.5M | 257,097 | 0.03% | 23q | -1.1%-$371.6K |
| MILLENNIUM MANAGEMENT LLC | $31.8M | 157,057 | 0.01% | 26q | -58.1%-$44.1M |
| IMC-Chicago, LLC | $30.8M | options only | 0.01% | 11q | OPTIONS |
Showing the largest 100 of 1,175 reported holders.
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 1,105 | $31.3B | 244,113,943 | 138 | 370 | 324 | 1.6% |
| Q1 2026 | 1,030 | $24.4B | 234,888,577 | 158 | 342 | 308 | 1.6% |
| Q4 2025 | 940 | $19.2B | 229,322,761 | 64 | 283 | 359 | 1.0% |
| Q3 2025 | 944 | $23.3B | 226,518,272 | 64 | 303 | 334 | 0.9% |
| Q2 2025 | 961 | $23.5B | 226,433,500 | 103 | 337 | 303 | 1.1% |
| Q1 2025 | 914 | $19.4B | 221,135,235 | 74 | 287 | 332 | 1.7% |
| Q4 2024 | 974 | $22.6B | 211,189,189 | 60 | 278 | 350 | 1.6% |
| Q3 2024 | 968 | $26.0B | 215,063,690 | 136 | 256 | 349 | 2.0% |
| Q2 2024 | 888 | $19.6B | 215,781,139 | 91 | 274 | 301 | 1.3% |
| Q1 2024 | 848 | $17.1B | 210,701,789 | 101 | 242 | 279 | 1.4% |
| Q4 2023 | 796 | $14.6B | 205,412,115 | 91 | 215 | 280 | 1.2% |
| Q3 2023 | 728 | $12.8B | 211,616,813 | 70 | 220 | 252 | 1.5% |
| Q2 2023 | 702 | $12.2B | 209,556,438 | 67 | 220 | 239 | 2.2% |
| Q1 2023 | 673 | $11.7B | 217,363,414 | 60 | 223 | 217 | 1.9% |
| Q4 2022 | 610 | $10.1B | 199,741,846 | 52 | 209 | 192 | 2.1% |
| Q3 2022 | 746 | $10.2B | 227,230,001 | 60 | 267 | 231 | 1.9% |
| Q2 2022 | 767 | $11.2B | 224,190,394 | 69 | 274 | 242 | 2.0% |
| Q1 2022 | 781 | $12.7B | 225,291,915 | 83 | 277 | 256 | 2.1% |
| Q4 2021 | 756 | $12.4B | 231,747,806 | 80 | 243 | 227 | 3.3% |
| Q3 2021 | 714 | $10.1B | 228,378,085 | 62 | 252 | 231 | 1.7% |
| Q2 2021 | 695 | $9.9B | 229,277,786 | 111 | 229 | 206 | 2.3% |
| Q1 2021 | 630 | $8.6B | 227,656,401 | 76 | 231 | 204 | 2.2% |
| Q4 2020 | 612 | $7.0B | 232,289,315 | 70 | 229 | 170 | 1.6% |
| Q3 2020 | 594 | $6.6B | 242,832,570 | 72 | 235 | 177 | 1.7% |
| Q2 2020 | 568 | $6.6B | 247,062,711 | 86 | 189 | 180 | 2.7% |
| Q1 2020 | 540 | $6.0B | 248,269,735 | 53 | 214 | 169 | 1.5% |
| Q4 2019 | 582 | $8.0B | 247,384,889 | 69 | 220 | 140 | 1.8% |
| Q3 2019 | 524 | $8.1B | 245,319,569 | 61 | 201 | 147 | 2.3% |
| Q2 2019 | 524 | $8.1B | 251,064,049 | 71 | 200 | 153 | 2.5% |
| Q1 2019 | 540 | $9.2B | 255,708,350 | 88 | 194 | 142 | 1.4% |
| Q4 2018 | 485 | $8.5B | 260,821,493 | 10 | 12 | 11 | 0.9% |