Iron Mountain Inc
IRM- Exchange
- NYSE
- Industry
- Real Estate Investment Trusts
- SEC CIK
- 0001020569
In the last 90 days, Iron Mountain Inc insiders filed 0 open-market purchases and 8 sales; 1,173 institutions reported holding it in 13F filings for Q2 2026, worth $32.5B in total; no superinvestor holds it.
13F holders, Q2 2026
Institutional positions in Iron Mountain Inc as of Jun 30, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 1,173
- +93 vs. Q1 2026
- Shares held
- 257.3M
- +4.07M (+1.6%) vs. Q1 2026
- Total value
- $32.5B
- +$6.62B (+25.6%) vs. Q1 2026
- New holders
- 154
- 449 more added
- Sold out
- 61
- 383 more reduced
10 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2026: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting IRM on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 1,173 | $32.5B |
| Q1 2026 | 1,090 | $25.9B |
| Q4 2025 | 1,011 | $21.5B |
| Q3 2025 | 1,017 | $25.8B |
| Q2 2025 | 1,045 | $25.8B |
| Q1 2025 | 995 | $21.1B |
| Q4 2024 | 1,067 | $25.0B |
| Q3 2024 | 1,055 | $29.1B |
| Q2 2024 | 966 | $22.4B |
| Q1 2024 | 938 | $19.8B |
| Q4 2023 | 891 | $16.8B |
| Q3 2023 | 831 | $13.7B |
| Q2 2023 | 817 | $13.0B |
| Q1 2023 | 790 | $12.3B |
| Q4 2022 | 782 | $11.4B |
| Q3 2022 | 743 | $10.0B |
| Q2 2022 | 767 | $10.9B |
| Q1 2022 | 777 | $12.5B |
| Q4 2021 | 754 | $12.0B |
| Q3 2021 | 711 | $9.94B |
| Q2 2021 | 687 | $9.73B |
| Q1 2021 | 630 | $8.44B |
Institutions, Q2 2026
Shares, value and share of portfolio for each institution holding Iron Mountain Inc; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock, Inc. | 33,570,910 | $4.24B | 0.06% | +549,556+1.7% | Added |
| Vanguard Portfolio Management LLC | 25,568,944 | $3.23B | 0.15% | +553,387+2.2% | Added |
| Vanguard Capital Management LLC | 18,953,705 | $2.39B | 0.05% | +194,816+1.0% | Added |
| State Street Corp | 17,634,044 | $2.24B | 0.07% | +82,411+0.5% | Added |
| Cohen & Steers, Inc. | 12,019,735 | $1.52B | 2.40% | −4,149,606−25.7% | Reduced |
| Geode Capital Management, LLC | 8,649,249 | $1.09B | 0.06% | +163,122+1.9% | Added |
| FMR LLC | 7,872,365 | $994.4M | 0.04% | +387,967+5.2% | Added |
| Dimensional Fund Advisors LP | 4,625,684 | $584.3M | 0.11% | +73,398+1.6% | Added |
| Morgan Stanley | 4,426,922 | $559.2M | 0.03% | −225,325−4.8% | Reduced |
| Principal Financial Group Inc | 4,373,424 | $552.4M | 0.27% | −192,669−4.2% | Reduced |
| Charles Schwab Investment Management Inc | 4,263,487 | $538.5M | 0.07% | +250,480+6.2% | Added |
| Northern Trust Corp | 4,222,967 | $533.4M | 0.06% | +72,481+1.7% | Added |
| Norges Bank | 4,214,697 | $532.4M | 0.05% | +4,214,697 | New |
| Invesco Ltd. | 4,065,649 | $513.5M | 0.04% | +144,128+3.7% | Added |
| Legal & General Group Plc | 3,244,741 | $409.8M | 0.09% | +109,667+3.5% | Added |
| UBS Asset Management Americas Inc | 3,193,560 | $403.4M | 0.07% | +3,182,834+29,674.0% | Added |
| Deutsche Bank AG | 3,049,079 | $385.1M | 0.11% | −43,005−1.4% | Reduced |
| Goldman Sachs Group Inc | 2,822,732 | $356.5M | 0.04% | +606,060+27.3% | Added |
| Centersquare Investment Management LLC | 2,323,974 | $293.5M | 2.51% | +13,929+0.6% | Added |
| JPMorgan Chase & Co | 2,212,137 | $287.5M | 0.02% | +88,779+4.2% | Added |
| Nuveen, LLC | 2,218,771 | $280.3M | 0.07% | +150,363+7.3% | Added |
| AQR Capital Management LLC | 2,127,095 | $266.5M | 0.09% | +281,022+15.2% | Added |
| Prudential Financial Inc | 1,974,079 | $249.3M | 0.27% | −441,984−18.3% | Reduced |
| Vontobel Holding Ltd. | 1,919,656 | $242.5M | 0.81% | −197,221−9.3% | Reduced |
| Daiwa Securities Group Inc. | 1,861,547 | $235.1M | 0.53% | −1,245,893−40.1% | Reduced |
| Ameriprise Financial Inc | 1,668,337 | $210.9M | 0.04% | −182,670−9.9% | Reduced |
| Vanguard Fiduciary Trust Co | 1,658,635 | $209.5M | 0.05% | +5,747+0.3% | Added |
| Royal Bank of Canada | 1,640,511 | $207.2M | 0.04% | +229,791+16.3% | Added |
| Bank of New York Mellon Corp | 1,600,078 | $202.1M | 0.03% | −24,758−1.5% | Reduced |
| Duff & Phelps Investment Management Co | 1,455,435 | $183.8M | 1.73% | −119,902−7.6% | Reduced |
| Russell Investments Group, Ltd. | 1,403,623 | $177.4M | 0.16% | −51,490−3.5% | Reduced |
| HSBC Holdings PLC | 1,347,871 | $170.3M | 0.08% | +75,016+5.9% | Added |
| Contour Asset Management LLC | 1,274,684 | $161.0M | 3.81% | −170,139−11.8% | Reduced |
| Capital World Investors | 1,217,169 | $153.7M | 0.02% | −650,000−34.8% | Reduced |
| Amundi | 1,168,430 | $147.6M | 0.04% | +76,856+7.0% | Added |
| American Century Companies Inc | 1,154,487 | $145.8M | 0.06% | +338,695+41.5% | Added |
| Bank of America Corp | 1,118,827 | $141.3M | 0.01% | −280,548−20.0% | Reduced |
| Cbre Clarion Securities LLC | 1,072,881 | $135.5M | 1.89% | −165,034−13.3% | Reduced |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 982,596 | $124.1M | 0.07% | +74,231+8.2% | Added |
| UBS Group AG | 915,101 | $115.6M | 0.02% | +113,671+14.2% | Added |
| DekaBank Deutsche Girozentrale | 1,122,500 | $114.2M | 0.19% | 00.0% | Unchanged |
| Sumitomo Mitsui Trust Holdings, Inc. | 896,560 | $113.2M | 0.06% | −37,162−4.0% | Reduced |
| Swiss National Bank | 839,061 | $106.0M | 0.06% | −28,400−3.3% | Reduced |
| Pictet Asset Management Holding SA | 817,622 | $103.3M | 0.10% | −47,115−5.4% | Reduced |
| CIBC Bancorp USA Inc. | 777,480 | $98.2M | 0.12% | −51,313−6.2% | Reduced |
| Barclays PLC | 743,343 | $93.9M | 0.03% | +69,572+10.3% | Added |
| SEI Investments Co | 697,737 | $88.1M | 0.08% | −277,055−28.4% | Reduced |
| Standard Life Aberdeen plc | 691,514 | $87.3M | 0.12% | +320,306+86.3% | Added |
| APG Asset Management US Inc. | 703,912 | $85.8M | 0.60% | 00.0% | Unchanged |
| PGGM Investments | 675,093 | $85.3M | 2.10% | −694,905−50.7% | Reduced |
| Wells Fargo & Company | 662,157 | $83.6M | 0.01% | +3,703+0.6% | Added |
| BNP Paribas Arbitrage, SA | 648,227 | $81.9M | 0.04% | +139,716+27.5% | Added |
| Vanguard Global Advisers, LLC | 641,901 | $81.1M | 0.04% | −5,874−0.9% | Reduced |
| LPL Financial LLC | 640,383 | $80.9M | 0.02% | +19,145+3.1% | Added |
| Welch & Forbes LLC | 639,322 | $80.8M | 0.98% | −12,746−2.0% | Reduced |
| Price T Rowe Associates Inc | 634,613 | $80.2M | 0.01% | +33,032+5.5% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 610,889 | $77.1M | 0.12% | +20,385+3.5% | Added |
| Quantinno Capital Management LP | 590,647 | $74.6M | 0.09% | +268,630+83.4% | Added |
| Nomura Asset Management Co Ltd | 588,384 | $74.3M | 0.16% | +25,041+4.4% | Added |
| Rhumbline Advisers | 573,267 | $72.4M | 0.05% | −5,276−0.9% | Reduced |
| Vanguard Asset Management, Ltd | 568,845 | $71.9M | 0.05% | +63,850+12.6% | Added |
| Raymond James Financial Inc | 561,539 | $70.9M | 0.02% | +266,406+90.3% | Added |
| Asset Management One Co.,Ltd. | 554,607 | $70.1M | 0.18% | +7,133+1.3% | Added |
| California Public Employees Retirement System | 553,872 | $70.0M | 0.04% | +51,412+10.2% | Added |
| Nomura Asset Management International Inc. | 552,190 | $69.7M | 0.10% | −34,691−5.9% | Reduced |
| Worldquant Millennium Advisors LLC | 537,162 | $67.8M | 0.23% | −10,887−2.0% | Reduced |
| Adage Capital Partners GP, L.L.C. | 535,152 | $67.6M | 0.09% | −54,900−9.3% | Reduced |
| Wellington Management Group LLP | 512,906 | $64.8M | 0.01% | +164,991+47.4% | Added |
| Clark Capital Management Group, Inc. | 476,766 | $60.2M | 0.33% | +8,401+1.8% | Added |
| Colony Capital, Inc. | 457,126 | $57.7M | 3.47% | −46,895−9.3% | Reduced |
| Alliancebernstein L.P. | 562,711 | $57.5M | 0.02% | −2,544−0.5% | Reduced |
| National Pension Service | 454,815 | $57.4M | 0.04% | +25,423+5.9% | Added |
| Bank of Montreal | 453,715 | $57.3M | 0.02% | +47,702+11.7% | Added |
| Healthcare of Ontario Pension Plan Trust Fund | 443,901 | $56.1M | 0.08% | +229,015+106.6% | Added |
| Virginia Retirement Systems Et Al | 441,803 | $55.8M | 0.33% | +1,695+0.4% | Added |
| California State Teachers Retirement System | 434,529 | $54.9M | 0.05% | +11,658+2.8% | Added |
| Public Employees Retirement System of Ohio | 422,586 | $53.4M | 0.16% | −1,128−0.3% | Reduced |
| Citigroup Inc | 422,524 | $53.4M | 0.02% | +106,890+33.9% | Added |
| Voloridge Investment Management, LLC | 412,748 | $52.1M | 0.22% | +412,748 | New |
| Jane Street Group, LLC | 396,541 | $50.1M | 0.03% | −310,900−43.9% | Reduced |
| Rockefeller Capital Management L.P. | 391,620 | $49.5M | 0.08% | +2,480+0.6% | Added |
| Heitman Real Estate Securities LLC | 357,721 | $45.2M | 2.90% | +98,127+37.8% | Added |
| Great West Life Assurance Co | 355,692 | $44.8M | 0.07% | +19,832+5.9% | Added |
| Vanguard Investments Australia, Ltd. | 347,312 | $43.9M | 0.11% | +3,978+1.2% | Added |
| Citadel Advisors LLC | 343,168 | $43.3M | 0.02% | −31,786−8.5% | Reduced |
| Adelante Capital Management LLC | 325,641 | $41.1M | 2.70% | −31,293−8.8% | Reduced |
| Adell Harriman & Carpenter Inc | 316,465 | $40.0M | 2.05% | +648+0.2% | Added |
| Bamco Inc | 310,721 | $39.2M | 0.06% | −214,549−40.8% | Reduced |
| Robeco Institutional Asset Management B.V. | 297,899 | $37.6M | 0.05% | +283,296+1,940.0% | Added |
| Teacher Retirement System of Texas | 297,427 | $37.6M | 0.10% | −97,274−24.6% | Reduced |
| Marble Harbor Investment Counsel, LLC | 295,533 | $37.3M | 3.79% | −4,941−1.6% | Reduced |
| Acadian Asset Management LLC | 292,064 | $36.9M | 0.04% | +123,157+72.9% | Added |
| Neuberger Berman Group LLC | 290,384 | $36.7M | 0.02% | −70,367−19.5% | Reduced |
| Swedbank AB | 287,064 | $36.3M | 0.03% | +26,734+10.3% | Added |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 286,428 | $36.2M | 0.18% | +84,112+41.6% | Added |
| SG Americas Securities, LLC | 284,584 | $35.9M | 0.02% | +284,584 | New |
| Macquarie Group Ltd | 275,969 | $34.9M | 0.15% | +5,353+2.0% | Added |
| Border to Coast Pensions Partnership Ltd | 275,000 | $34.7M | 0.51% | −195,000−41.5% | Reduced |
| Victory Capital Management Inc | 268,209 | $33.9M | 0.02% | +30,019+12.6% | Added |
| Apollo Management Holdings, L.P. | 265,539 | $33.5M | 0.47% | 00.0% | Unchanged |