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 6 sales; 1,173 institutions reported holding it in 13F filings for Q2 2026, worth $32.4B 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
- 257.1M
- +3.96M (+1.6%) vs. Q1 2026
- Total value
- $32.4B
- +$6.60B (+25.5%) vs. Q1 2026
- New holders
- 154
- 446 more added
- Sold out
- 61
- 386 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 | $32.4B |
| Q1 2026 | 1,090 | $25.9B |
| Q4 2025 | 1,011 | $21.4B |
| Q3 2025 | 1,017 | $25.5B |
| Q2 2025 | 1,045 | $25.5B |
| Q1 2025 | 995 | $21.1B |
| Q4 2024 | 1,067 | $24.9B |
| Q3 2024 | 1,056 | $28.8B |
| Q2 2024 | 967 | $22.2B |
| Q1 2024 | 938 | $19.0B |
| Q4 2023 | 891 | $16.4B |
| Q3 2023 | 831 | $13.7B |
| Q2 2023 | 817 | $12.9B |
| Q1 2023 | 790 | $12.0B |
| Q4 2022 | 782 | $11.4B |
| Q3 2022 | 743 | $10.0B |
| Q2 2022 | 767 | $10.9B |
| Q1 2022 | 777 | $12.4B |
| Q4 2021 | 754 | $12.0B |
| Q3 2021 | 711 | $9.94B |
| Q2 2021 | 687 | $9.70B |
| 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 |
|---|---|---|---|---|---|
| Bank of Montreal | 453,715 | $57.3M | 0.02% | +47,702+11.7% | Added |
| National Pension Service | 454,815 | $57.4M | 0.04% | +25,423+5.9% | Added |
| Alliancebernstein L.P. | 562,711 | $57.5M | 0.02% | −2,544−0.5% | Reduced |
| Colony Capital, Inc. | 457,126 | $57.7M | 3.47% | −46,895−9.3% | Reduced |
| Clark Capital Management Group, Inc. | 476,766 | $60.2M | 0.33% | +8,401+1.8% | Added |
| Wellington Management Group LLP | 512,906 | $64.8M | 0.01% | +164,991+47.4% | Added |
| Adage Capital Partners GP, L.L.C. | 535,152 | $67.6M | 0.09% | −54,900−9.3% | Reduced |
| Worldquant Millennium Advisors LLC | 537,162 | $67.8M | 0.23% | −10,887−2.0% | Reduced |
| Nomura Asset Management International Inc. | 552,190 | $69.7M | 0.10% | −34,691−5.9% | Reduced |
| California Public Employees Retirement System | 553,872 | $70.0M | 0.04% | +51,412+10.2% | Added |
| Asset Management One Co.,Ltd. | 554,607 | $70.1M | 0.18% | +7,133+1.3% | Added |
| Raymond James Financial Inc | 561,539 | $70.9M | 0.02% | +266,406+90.3% | Added |
| Vanguard Asset Management, Ltd | 568,845 | $71.9M | 0.05% | +63,850+12.6% | Added |
| Rhumbline Advisers | 573,267 | $72.4M | 0.05% | −5,276−0.9% | Reduced |
| Nomura Asset Management Co Ltd | 588,384 | $74.3M | 0.16% | +25,041+4.4% | Added |
| Quantinno Capital Management LP | 590,647 | $74.6M | 0.09% | +268,630+83.4% | Added |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 610,889 | $77.1M | 0.12% | +20,385+3.5% | Added |
| Price T Rowe Associates Inc | 634,613 | $80.2M | 0.01% | +33,032+5.5% | Added |
| Welch & Forbes LLC | 639,322 | $80.8M | 0.98% | −12,746−2.0% | Reduced |
| LPL Financial LLC | 640,383 | $80.9M | 0.02% | +19,145+3.1% | Added |
| Vanguard Global Advisers, LLC | 641,901 | $81.1M | 0.04% | −5,874−0.9% | Reduced |
| BNP Paribas Arbitrage, SA | 648,227 | $81.9M | 0.04% | +139,716+27.5% | Added |
| Wells Fargo & Company | 662,157 | $83.6M | 0.01% | +3,703+0.6% | Added |
| PGGM Investments | 675,093 | $85.3M | 2.10% | −694,905−50.7% | Reduced |
| APG Asset Management US Inc. | 703,912 | $85.8M | 0.60% | 00.0% | Unchanged |
| Standard Life Aberdeen plc | 691,514 | $87.3M | 0.12% | +320,306+86.3% | Added |
| SEI Investments Co | 697,737 | $88.1M | 0.08% | −277,055−28.4% | Reduced |
| Barclays PLC | 743,343 | $93.9M | 0.03% | +69,572+10.3% | Added |
| CIBC Bancorp USA Inc. | 777,480 | $98.2M | 0.12% | −51,313−6.2% | Reduced |
| Pictet Asset Management Holding SA | 817,622 | $103.3M | 0.10% | −47,115−5.4% | Reduced |
| Swiss National Bank | 839,061 | $106.0M | 0.06% | −28,400−3.3% | Reduced |
| Sumitomo Mitsui Trust Holdings, Inc. | 896,560 | $113.2M | 0.06% | −37,162−4.0% | Reduced |
| DekaBank Deutsche Girozentrale | 1,122,500 | $114.2M | 0.19% | 00.0% | Unchanged |
| UBS Group AG | 915,101 | $115.6M | 0.02% | +113,671+14.2% | Added |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 982,596 | $124.1M | 0.07% | +74,231+8.2% | Added |
| Cbre Clarion Securities LLC | 1,072,881 | $135.5M | 1.89% | −165,034−13.3% | Reduced |
| Bank of America Corp | 1,118,827 | $141.3M | 0.01% | −280,548−20.0% | Reduced |
| American Century Companies Inc | 1,154,487 | $145.8M | 0.06% | +338,695+41.5% | Added |
| Amundi | 1,168,430 | $147.6M | 0.04% | +76,856+7.0% | Added |
| Capital World Investors | 1,217,169 | $153.7M | 0.02% | −650,000−34.8% | Reduced |
| Contour Asset Management LLC | 1,274,684 | $161.0M | 3.81% | −170,139−11.8% | Reduced |
| HSBC Holdings PLC | 1,347,871 | $170.3M | 0.08% | +75,016+5.9% | Added |
| Russell Investments Group, Ltd. | 1,403,623 | $177.4M | 0.16% | −51,490−3.5% | Reduced |
| Duff & Phelps Investment Management Co | 1,455,435 | $183.8M | 1.73% | −119,902−7.6% | Reduced |
| Bank of New York Mellon Corp | 1,600,078 | $202.1M | 0.03% | −24,758−1.5% | Reduced |
| Royal Bank of Canada | 1,640,511 | $207.2M | 0.04% | +229,791+16.3% | Added |
| Vanguard Fiduciary Trust Co | 1,658,635 | $209.5M | 0.05% | +5,747+0.3% | Added |
| Ameriprise Financial Inc | 1,668,337 | $210.9M | 0.04% | −182,670−9.9% | Reduced |
| Daiwa Securities Group Inc. | 1,861,547 | $235.1M | 0.53% | −1,245,893−40.1% | Reduced |
| Vontobel Holding Ltd. | 1,919,656 | $242.5M | 0.81% | −197,221−9.3% | Reduced |
| Prudential Financial Inc | 1,974,079 | $249.3M | 0.27% | −441,984−18.3% | Reduced |
| AQR Capital Management LLC | 2,127,095 | $266.5M | 0.09% | +281,022+15.2% | Added |
| Nuveen, LLC | 2,218,771 | $280.3M | 0.07% | +150,363+7.3% | Added |
| JPMorgan Chase & Co | 2,212,137 | $287.5M | 0.02% | +88,779+4.2% | Added |
| Centersquare Investment Management LLC | 2,323,974 | $293.5M | 2.51% | +13,929+0.6% | Added |
| Goldman Sachs Group Inc | 2,822,732 | $356.5M | 0.04% | +606,060+27.3% | Added |
| Deutsche Bank AG | 3,049,079 | $385.1M | 0.11% | −43,005−1.4% | Reduced |
| UBS Asset Management Americas Inc | 3,193,560 | $403.4M | 0.07% | +3,182,834+29,674.0% | Added |
| Legal & General Group Plc | 3,244,741 | $409.8M | 0.09% | +109,667+3.5% | Added |
| Invesco Ltd. | 4,065,649 | $513.5M | 0.04% | +144,128+3.7% | Added |
| Norges Bank | 4,214,697 | $532.4M | 0.05% | +4,214,697 | New |
| Northern Trust Corp | 4,222,967 | $533.4M | 0.06% | +72,481+1.7% | Added |
| Charles Schwab Investment Management Inc | 4,263,487 | $538.5M | 0.07% | +250,480+6.2% | Added |
| Principal Financial Group Inc | 4,373,424 | $552.4M | 0.27% | −192,669−4.2% | Reduced |
| Morgan Stanley | 4,426,922 | $559.2M | 0.03% | −225,325−4.8% | Reduced |
| Dimensional Fund Advisors LP | 4,625,684 | $584.3M | 0.11% | +73,398+1.6% | Added |
| FMR LLC | 7,872,365 | $994.4M | 0.04% | +387,967+5.2% | Added |
| Geode Capital Management, LLC | 8,649,249 | $1.09B | 0.06% | +163,122+1.9% | Added |
| Cohen & Steers, Inc. | 12,019,735 | $1.52B | 2.40% | −4,149,606−25.7% | Reduced |
| State Street Corp | 17,634,044 | $2.24B | 0.07% | +82,411+0.5% | Added |
| Vanguard Capital Management LLC | 18,953,705 | $2.39B | 0.05% | +194,816+1.0% | Added |
| Vanguard Portfolio Management LLC | 25,568,944 | $3.23B | 0.15% | +553,387+2.2% | Added |
| BlackRock, Inc. | 33,570,910 | $4.24B | 0.06% | +549,556+1.7% | Added |
| Epoch Investment Partners, Inc. | 0 | $0 | 0.00% | −616,513−100.0% | Sold out |
| STRS Ohio | 0 | $0 | 0.00% | −287,817−100.0% | Sold out |
| Hudson Bay Capital Management LP | 0 | $0 | 0.00% | −190,884−100.0% | Sold out |
| SG Capital Management LLC | 0 | $0 | 0.00% | −163,636−100.0% | Sold out |
| Qube Research & Technologies Ltd | 0 | $0 | 0.00% | −81,478−100.0% | Sold out |
| PEAK6 LLC | 0 | $0 | 0.00% | −60,388−100.0% | Sold out |
| Oak Thistle LLC | 0 | $0 | 0.00% | −53,641−100.0% | Sold out |
| Anson Funds Management LP | 0 | $0 | 0.00% | −42,200−100.0% | Sold out |
| Y-Intercept (Hong Kong) Ltd | 0 | $0 | 0.00% | −33,654−100.0% | Sold out |
| Sage Capital Management, LLC | 0 | $0 | 0.00% | −26,692−100.0% | Sold out |
| Jain Global LLC | 0 | $0 | 0.00% | −24,108−100.0% | Sold out |
| Twinbeech Capital LP | 0 | $0 | 0.00% | −17,400−100.0% | Sold out |
| Simplex Trading, LLC | 0 | $0 | 0.00% | −14,800−100.0% | Sold out |
| Bleakley Financial Group, LLC | 0 | $0 | 0.00% | −12,119−100.0% | Sold out |
| Golden State Equity Partners | 0 | $0 | 0.00% | −11,822−100.0% | Sold out |
| Landscape Capital Management, L.L.C. | 0 | $0 | 0.00% | −9,839−100.0% | Sold out |
| Quadrant Capital Group LLC | 0 | $0 | 0.00% | −6,576−100.0% | Sold out |
| Aigen Investment Management, LP | 0 | $0 | 0.00% | −6,255−100.0% | Sold out |
| Bridgewater Associates, LP | 0 | $0 | 0.00% | −4,694−100.0% | Sold out |
| Flagship Harbor Advisors, LLC | 0 | $0 | 0.00% | −3,987−100.0% | Sold out |
| Beverly Hills Private Wealth, LLC | 0 | $0 | 0.00% | −3,956−100.0% | Sold out |
| Strategic Financial Concepts, LLC | 0 | $0 | 0.00% | −3,236−100.0% | Sold out |
| TradeLink Capital LLC | 0 | $0 | 0.00% | −3,083−100.0% | Sold out |
| Virtu Financial LLC | 0 | $0 | 0.00% | −3,006−100.0% | Sold out |
| Investment House LLC | 0 | $0 | 0.00% | −2,800−100.0% | Sold out |
| Allen Mooney & Barnes Investment Advisors LLC | 0 | $0 | 0.00% | −2,733−100.0% | Sold out |
| Cardiff Park Advisors, LLC | 0 | $0 | 0.00% | −2,725−100.0% | Sold out |