IRON MOUNTAIN INC (IRM) — Institutional Holders, Q2 2026
1,174 institutional investment managers reported a IRM position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $32.4B. Every filer is listed below, ranked by position value, 100 per page; this page shows ranks 1 to 100. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
IRM in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMENew · +3,193,560 sh+$403.4M
- GOLDMAN SACHS GROUPAdded · +606,060 sh+$76.6M
- VANGUARD PORTFOLIO MANAGEMENTAdded · +553,387 sh+$69.9M
- BlackRockAdded · +549,556 sh+$69.4M
- VIRGINIA RETIREMENT SYSTEMS ET AlAdded · +443,498 sh+$56.0M
Biggest sellers
- COHEN & STEERSTrimmed · -4,149,606 sh-$524.1M
- Daiwa Securities GroupTrimmed · -1,245,893 sh-$157.4M
- PGGM InvestmentsTrimmed · -694,905 sh-$87.8M
- Capital World InvestorsTrimmed · -650,000 sh-$82.1M
- Epoch Investment PartnersSold out · -616,513 sh-$77.9M
IRM 13F holders ranked 1–100 of 1,174
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | BlackRock#1 · 33,570,910 sh | 33,570,910 | $4.2B | 0.06% | +1.7% |
| 2 | VANGUARD PORTFOLIO MANAGEMENT#2 · 25,568,944 sh | 25,568,944 | $3.2B | 0.15% | +2.2% |
| 3 | VANGUARD CAPITAL MANAGEMENT#3 · 18,953,705 sh | 18,953,705 | $2.4B | 0.05% | +1.0% |
| 4 | STATE STREET#4 · 17,634,044 sh | 17,634,044 | $2.2B | 0.07% | +0.5% |
| 5 | COHEN & STEERS#5 · 12,019,735 sh | 12,019,735 | $1.5B | 2.40% | -25.7% |
| 6 | GEODE CAPITAL MANAGEMENT#6 · 8,649,249 sh | 8,649,249 | $1.1B | 0.06% | +1.9% |
| 7 | FMR#7 · 7,872,365 sh | 7,872,365 | $994.4M | 0.04% | +5.2% |
| 8 | DIMENSIONAL FUND ADVISORS#8 · 4,625,684 sh | 4,625,684 | $584.3M | 0.11% | +1.6% |
| 9 | MORGAN STANLEY#9 · 4,426,922 sh | 4,426,922 | $559.2M | 0.03% | -4.8% |
| 10 | PRINCIPAL FINANCIAL GROUP#10 · 4,373,424 sh | 4,373,424 | $552.4M | 0.27% | -4.2% |
| 11 | CHARLES SCHWAB INVESTMENT MANAGEMENT#11 · 4,263,487 sh | 4,263,487 | $538.5M | 0.07% | +6.2% |
| 12 | NORTHERN#12 · 4,222,967 sh | 4,222,967 | $533.4M | 0.06% | +1.7% |
| 13 | NORGES BANK#13 · 4,214,697 sh | 4,214,697 | $532.4M | 0.05% | — |
| 14 | Invesco Ltd.#14 · 4,065,649 sh | 4,065,649 | $513.5M | 0.04% | +3.7% |
| 15 | Legal & General Group Plc#15 · 3,244,741 sh | 3,244,741 | $409.8M | 0.09% | +3.5% |
| 16 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AME#16 · 3,193,560 sh | 3,193,560 | $403.4M | 0.07% | New |
| 17 | DEUTSCHE BANK AG\#17 · 3,049,079 sh | 3,049,079 | $385.1M | 0.11% | -1.4% |
| 18 | GOLDMAN SACHS GROUP#18 · 2,822,732 sh | 2,822,732 | $356.5M | 0.03% | +27.3% |
| 19 | CENTERSQUARE INVESTMENT MANAGEMENT#19 · 2,323,974 sh | 2,323,974 | $293.5M | 2.51% | +0.6% |
| 20 | JPMORGAN CHASE#20 · 2,212,137 sh | 2,212,137 | $287.5M | 0.02% | +4.2% |
| 21 | Nuveen#21 · 2,218,771 sh | 2,218,771 | $280.3M | 0.07% | +7.3% |
| 22 | AQR CAPITAL MANAGEMENT#22 · 2,127,095 sh | 2,127,095 | $266.5M | 0.09% | +15.2% |
| 23 | PRUDENTIAL FINANCIAL#23 · 1,974,079 sh | 1,974,079 | $249.3M | 0.27% | -18.3% |
| 24 | Vontobel Holding Ltd.#24 · 1,919,656 sh | 1,919,656 | $242.5M | — | -9.3% |
| 25 | Daiwa Securities Group#25 · 1,861,547 sh | 1,861,547 | $235.1M | 0.46% | -40.1% |
| 26 | AMERIPRISE FINANCIAL#26 · 1,668,337 sh | 1,668,337 | $210.9M | 0.04% | -9.9% |
| 27 | VANGUARD FIDUCIARY#27 · 1,658,635 sh | 1,658,635 | $209.5M | 0.05% | +0.3% |
| 28 | ROYAL BANK OF CANADA#28 · 1,640,511 sh | 1,640,511 | $207.2M | 0.03% | +16.3% |
| 29 | Bank of New York Mellon#29 · 1,600,078 sh | 1,600,078 | $202.1M | 0.03% | -1.5% |
| 30 | DUFF & PHELPS INVESTMENT MANAGEMENT#30 · 1,455,435 sh | 1,455,435 | $183.8M | 1.73% | -7.6% |
| 31 | Russell Investments Group, Ltd.#31 · 1,403,623 sh | 1,403,623 | $177.4M | 0.16% | -3.5% |
| 32 | HSBC PLC#32 · 1,347,871 sh | 1,347,871 | $170.3M | 0.07% | +5.9% |
| 33 | Contour Asset Management#33 · 1,274,684 sh | 1,274,684 | $161.0M | 3.81% | -11.8% |
| 34 | Capital World Investors#34 · 1,217,169 sh | 1,217,169 | $153.7M | 0.02% | -34.8% |
| 35 | Amundi#35 · 1,168,430 sh | 1,168,430 | $147.6M | 0.04% | +7.0% |
| 36 | AMERICAN CENTURY COMPANIES#36 · 1,154,487 sh | 1,154,487 | $145.8M | 0.06% | +41.5% |
| 37 | BANK OF AMERICA#37 · 1,118,827 sh | 1,118,827 | $141.3M | <0.01% | -20.0% |
| 38 | CBRE INVESTMENT MANAGEMENT LISTED REAL ASSETS#38 · 1,072,881 sh | 1,072,881 | $135.5M | 1.89% | -13.3% |
| 39 | Mitsubishi UFJ Asset Management , Ltd.#39 · 982,596 sh | 982,596 | $124.1M | 0.07% | +8.2% |
| 40 | UBS Group AG#40 · 915,101 sh | 915,101 | $115.6M | 0.01% | +14.2% |
| 41 | DekaBank Deutsche Girozentrale#41 · 1,122,500 sh | 1,122,500 | $114.2M | — | 0.0% |
| 42 | Sumitomo Mitsui#42 · 896,560 sh | 896,560 | $113.2M | 0.06% | -4.0% |
| 43 | VIRGINIA RETIREMENT SYSTEMS ET Al#43 · 883,606 sh | 883,606 | $111.6M | 0.42% | +100.8% |
| 44 | Swiss National Bank#44 · 839,061 sh | 839,061 | $106.0M | 0.06% | -3.3% |
| 45 | Pictet Asset Management Holding SA#45 · 817,622 sh | 817,622 | $103.3M | 0.10% | -5.4% |
| 46 | CIBC Bancorp USA#46 · 777,480 sh | 777,480 | $98.2M | 0.12% | -6.2% |
| 47 | BARCLAYS PLC#47 · 743,343 sh | 743,343 | $93.9M | 0.02% | +10.3% |
| 48 | SEI INVESTMENTS#48 · 697,737 sh | 697,737 | $88.1M | 0.08% | -28.4% |
| 49 | abrdn plc#49 · 691,514 sh | 691,514 | $87.3M | 0.12% | +86.3% |
| 50 | APG Asset Management US#50 · 703,912 sh | 703,912 | $85.8M | 0.60% | 0.0% |
| 51 | PGGM Investments#51 · 675,093 sh | 675,093 | $85.3M | 2.10% | -50.7% |
| 52 | WELLS FARGO & COMPANY#52 · 662,157 sh | 662,157 | $83.6M | 0.01% | +0.6% |
| 53 | BNP PARIBAS FINANCIAL MARKETS#53 · 648,227 sh | 648,227 | $81.9M | 0.03% | +27.5% |
| 54 | Vanguard Global Advisers#54 · 641,901 sh | 641,901 | $81.1M | 0.04% | -0.9% |
| 55 | LPL Financial#55 · 640,383 sh | 640,383 | $80.9M | 0.02% | +3.1% |
| 56 | WELCH & FORBES#56 · 639,322 sh | 639,322 | $80.8M | 0.98% | -2.0% |
| 57 | PRICE T ROWE ASSOCIATES#57 · 634,613 sh | 634,613 | $80.2M | <0.01% | +5.5% |
| 58 | Universal- Beteiligungs- und Servicegesellschaft mbH#58 · 610,889 sh | 610,889 | $77.1M | 0.12% | +3.5% |
| 59 | Quantinno Capital Management#59 · 590,647 sh | 590,647 | $74.6M | 0.09% | +83.4% |
| 60 | NOMURA ASSET MANAGEMENT LTD#60 · 588,384 sh | 588,384 | $74.3M | 0.16% | +4.4% |
| 61 | RHUMBLINE ADVISERS#61 · 573,267 sh | 573,267 | $72.4M | 0.05% | -0.9% |
| 62 | VANGUARD ASSET MANAGEMENT, Ltd#62 · 568,845 sh | 568,845 | $71.9M | 0.05% | +12.6% |
| 63 | RAYMOND JAMES FINANCIAL#63 · 561,539 sh | 561,539 | $70.9M | 0.02% | +90.3% |
| 64 | Asset Management One , Ltd.#64 · 554,607 sh | 554,607 | $70.1M | — | +1.3% |
| 65 | CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM#65 · 553,872 sh | 553,872 | $70.0M | 0.04% | +10.2% |
| 66 | NOMURA ASSET MANAGEMENT INTERNATIONAL#66 · 552,190 sh | 552,190 | $69.7M | 0.10% | -5.9% |
| 67 | WORLDQUANT MILLENNIUM ADVISORS#67 · 537,162 sh | 537,162 | $67.8M | 0.23% | -2.0% |
| 68 | ADAGE CAPITAL PARTNERS GP, L.L.C.#68 · 535,152 sh | 535,152 | $67.6M | 0.09% | -9.3% |
| 69 | WELLINGTON MANAGEMENT GROUP LLP#69 · 512,906 sh | 512,906 | $64.8M | 0.01% | +47.4% |
| 70 | Clark Capital Management Group#70 · 476,766 sh | 476,766 | $60.2M | 0.33% | +1.8% |
| 71 | DigitalBridge Group#71 · 457,126 sh | 457,126 | $57.7M | 3.46% | -9.3% |
| 72 | ALLIANCEBERNSTEIN L.P.#72 · 562,711 sh | 562,711 | $57.5M | 0.02% | -0.5% |
| 73 | National Pension Service#73 · 454,815 sh | 454,815 | $57.4M | 0.04% | +5.9% |
| 74 | BANK OF MONTREAL#74 · 453,715 sh | 453,715 | $57.3M | 0.02% | +11.7% |
| 75 | HEALTHCARE OF ONTARIO PENSION PLAN FUND#75 · 443,901 sh | 443,901 | $56.1M | 0.08% | +106.6% |
| 76 | PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO#76 · 422,586 sh | 422,586 | $53.4M | 0.16% | -0.3% |
| 77 | CITIGROUP#77 · 422,524 sh | 422,524 | $53.4M | 0.02% | +33.9% |
| 78 | VOLORIDGE INVESTMENT MANAGEMENT#78 · 412,748 sh | 412,748 | $52.1M | 0.22% | New |
| 79 | JANE STREET GROUP#79 · 396,541 sh | 396,541 | $50.1M | <0.01% | -43.9% |
| 80 | Rockefeller Capital Management L.P.#80 · 391,620 sh | 391,620 | $49.5M | 0.08% | +0.6% |
| 81 | HEITMAN REAL ESTATE SECURITIES#81 · 357,721 sh | 357,721 | $45.2M | 2.90% | +37.8% |
| 82 | GREAT WEST LIFE ASSURANCE#82 · 355,692 sh | 355,692 | $44.8M | 0.07% | +5.9% |
| 83 | Vanguard Investments Australia, Ltd.#83 · 347,312 sh | 347,312 | $43.9M | 0.11% | +1.2% |
| 84 | CITADEL ADVISORS#84 · 343,168 sh | 343,168 | $43.3M | <0.01% | -8.5% |
| 85 | Adelante Capital Management#85 · 325,641 sh | 325,641 | $41.1M | 2.70% | -8.8% |
| 86 | ADELL HARRIMAN & CARPENTER#86 · 316,465 sh | 316,465 | $40.0M | 2.05% | +0.2% |
| 87 | BAMCO#87 · 310,721 sh | 310,721 | $39.2M | 0.06% | -40.8% |
| 88 | Robeco Institutional Asset Management B.V.#88 · 297,899 sh | 297,899 | $37.6M | — | +1940.0% |
| 89 | TEACHER RETIREMENT SYSTEM OF TEXAS#89 · 297,427 sh | 297,427 | $37.6M | 0.10% | -24.6% |
| 90 | Marble Harbor Investment Counsel#90 · 295,533 sh | 295,533 | $37.3M | 3.79% | -1.6% |
| 91 | ACADIAN ASSET MANAGEMENT#91 · 292,064 sh | 292,064 | $36.9M | 0.04% | +72.9% |
| 92 | Neuberger Berman Group#92 · 290,384 sh | 290,384 | $36.7M | 0.02% | -19.5% |
| 93 | Swedbank AB#93 · 287,064 sh | 287,064 | $36.3M | — | +10.3% |
| 94 | COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS#94 · 286,428 sh | 286,428 | $36.2M | 0.18% | +41.6% |
| 95 | SG Americas Securities#95 · 284,584 sh | 284,584 | $35.9M | 0.02% | New |
| 96 | MACQUARIE GROUP LTD#96 · 275,969 sh | 275,969 | $34.9M | 0.15% | +2.0% |
| 97 | Border to Coast Pensions Partnership Ltd#97 · 275,000 sh | 275,000 | $34.7M | — | -41.5% |
| 98 | VICTORY CAPITAL MANAGEMENT#98 · 268,209 sh | 268,209 | $33.9M | 0.02% | +12.6% |
| 99 | Apollo Management , L.P.#99 · 265,539 sh | 265,539 | $33.5M | 0.38% | 0.0% |
| 100 | AVIVA PLC#100 · 260,627 sh | 260,627 | $32.9M | 0.05% | -1.0% |
Funds that sold out of IRM in Q2 2026 (63)
Held IRM at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.