Iron Mountain Inc. 13F holders
1,177 funds reported a position in Iron Mountain Inc. in their 13F for the quarter ended 30 June 2026, together 257.3 million shares worth $32.46 billion. Against the quarter before, 121 opened a position, 433 added, 376 trimmed and 61 sold out; together they sold a net 466,975 shares. The largest holders: BlackRock, Inc., Vanguard Portfolio Management LLC and Vanguard Capital Management LLC.
Funds holding1,177+84 on Q1 2026
Shares they held257.3Mworth $32.46 billion
Net sold on the quarter466,975 sharesabout $58.9 million at the funds' values
Funds buying to selling554 to 437opened or added, to cut or sold
Opened 121Added 433Held 237Trimmed 376Sold out 61
What each fund did in IRM against its 13F for the quarter before; a change under 0.1% of a holding counts as held
Funds reporting a position in IRM in their 13F, each quarter; hover a bar for the shares they held
Filed so far for the quarter to 30 September 2026
4,696 funds have filed their 13F for the quarter so far; the rest are due by 16 November 2026. Of those, 616 reported a position in Iron Mountain Inc.: 35 opened one, 234 added, 176 trimmed and 47 sold out, a net 3.3 million shares sold.
The largest moves in the name among the funds that have filed, against each fund's previous 13F.
The well-known funds
Of the 44 funds followed here, 1 reported a position in Iron Mountain Inc. in a 13F for the quarter ended 30 September 2026, and 7 more in a 13F for an earlier quarter, the latest each has filed. The largest: FMR LLC, 7.9 million shares worth $994.4 million, 0.0% of its reported book (its 13F for the quarter ended 30 June 2026). Sold out: Bridgewater Associates. In the quarter, 1 fund added or opened a position and 0 trimmed or sold out; together they bought a net 229,284 shares, about $25.3 million at the funds' own value per share on 30 September 2026. A change under 0.1% of a holding counts as held.
| Fund | Shares | Value | Of its book | Change on the quarter | Status | Quarter ended | Filing |
|---|---|---|---|---|---|---|---|
| FMR LLC | 7,872,365 | $994.4 million | 0.0% | +387,967 | added | 30 June 2026, an earlier quarter | 13F |
| Geode Capital Management | 8,878,533 | $981.5 million | 0.1% | +229,284 | added | 30 September 2026 | 13F |
| Norges Bank | 4,214,697 | $532.4 million | 0.1% | held | 30 June 2026, an earlier quarter | 13F | |
| Citadel Advisors | 343,168 | $43.3 million | 0.0% | -31,786 | trimmed | 30 June 2026, an earlier quarter | 13F |
| Millennium Management | 157,057 | $19.8 million | 0.0% | -217,406 | trimmed | 30 June 2026, an earlier quarter | 13F |
| Point72 Asset Management | 123,262 | $15.6 million | 0.0% | -254,356 | trimmed | 30 June 2026, an earlier quarter | 13F |
| Two Sigma Investments | 65,892 | $8.3 million | 0.0% | -113,310 | trimmed | 30 June 2026, an earlier quarter | 13F |
| Renaissance Technologies | 7,700 | $972,587 | 0.0% | +5,300 | added | 30 June 2026, an earlier quarter | 13F |
| Bridgewater Associates | 0 | $0 | 0.0% | -4,694 | exited | 30 June 2026, an earlier quarter | 13F |
Value is what the fund reported.
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Change is shares against the fund's previous 13F; a fund with one filing read shows no change. 13Fs cover long US positions of managers above $100 million and are filed up to 45 days after the quarter.The largest holders
| Fund | Shares | Share of all | Value | Of its book | Change in shares | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 33,570,910 | 13.05% | $4.24 billion | 0.06% | +549,556 | 13F |
| Vanguard Portfolio Management LLC | 25,568,944 | 9.94% | $3.23 billion | 0.15% | +553,387 | 13F |
| Vanguard Capital Management LLC | 18,953,705 | 7.37% | $2.39 billion | 0.05% | +194,816 | 13F |
| State Street Corp. | 17,634,044 | 6.85% | $2.24 billion | 0.07% | +82,411 | 13F |
| Cohen & Steers, Inc. | 12,019,735 | 4.67% | $1.52 billion | 2.40% | -4,149,606 | 13F |
| Geode Capital Management, LLC | 8,649,249 | 3.36% | $1.09 billion | 0.06% | +163,122 | 13F |
| FMR LLC | 7,872,365 | 3.06% | $994.4 million | 0.04% | +387,967 | 13F |
| Dimensional Fund Advisors LP | 4,625,684 | 1.80% | $584.3 million | 0.11% | +73,398 | 13F |
| Morgan Stanley | 4,426,922 | 1.72% | $559.2 million | 0.03% | -225,325 | 13F |
| Principal Financial Group Inc. | 4,373,424 | 1.70% | $552.4 million | 0.27% | -192,669 | 13F |
| Charles Schwab Investment Management Inc. | 4,263,487 | 1.66% | $538.5 million | 0.07% | +250,480 | 13F |
| Northern Trust Corp. | 4,222,967 | 1.64% | $533.4 million | 0.06% | +72,481 | 13F |
| Norges Bank | 4,214,697 | 1.64% | $532.4 million | 0.05% | 13F | |
| Invesco Ltd. | 4,065,649 | 1.58% | $513.5 million | 0.04% | +144,128 | 13F |
| Legal & General Group Plc | 3,244,741 | 1.26% | $409.8 million | 0.09% | +109,667 | 13F |
| UBS AM, a distinct business unit of UBS Asset Management Americas LLC | 3,193,560 | 1.24% | $403.4 million | 0.07% | +3,182,834 | 13F |
| Deutsche Bank AG | 3,049,079 | 1.19% | $385.1 million | 0.11% | -43,005 | 13F |
| Goldman Sachs Group Inc. | 2,822,732 | 1.10% | $356.5 million | 0.04% | +606,060 | 13F |
| Centersquare Investment Management LLC | 2,323,974 | 0.90% | $293.5 million | 2.50% | +13,929 | 13F |
| JPMorgan Chase & Co. | 2,212,137 | 0.86% | $287.5 million | 0.02% | +88,779 | 13F |
| Nuveen, LLC | 2,218,771 | 0.86% | $280.3 million | 0.07% | +150,363 | 13F |
| AQR Capital Management LLC | 2,127,095 | 0.83% | $266.5 million | 0.09% | +281,022 | 13F |
| Prudential Financial Inc. | 1,974,079 | 0.77% | $249.3 million | 0.27% | -441,984 | 13F |
| Vontobel Holding Ltd. | 1,919,656 | 0.75% | $242.5 million | 0.81% | -197,221 | 13F |
| Daiwa Securities Group Inc. | 1,861,547 | 0.72% | $235.1 million | 0.53% | -1,245,893 | 13F |
| Ameriprise Financial Inc. | 1,668,337 | 0.65% | $210.9 million | 0.04% | -182,670 | 13F |
| Vanguard Fiduciary Trust Co. | 1,658,635 | 0.64% | $209.5 million | 0.05% | +5,747 | 13F |
| Royal Bank of Canada | 1,640,511 | 0.64% | $207.2 million | 0.04% | +229,791 | 13F |
| Bank of New York Mellon Corp | 1,600,078 | 0.62% | $202.1 million | 0.03% | -24,758 | 13F |
| Duff & Phelps Investment Management Co. | 1,455,435 | 0.57% | $183.8 million | 1.74% | -119,902 | 13F |
| Russell Investments Group, Ltd. | 1,403,623 | 0.55% | $177.4 million | 0.16% | -51,490 | 13F |
| HSBC Holdings PLC | 1,347,871 | 0.52% | $170.3 million | 0.08% | +75,016 | 13F |
| Contour Asset Management LLC | 1,274,684 | 0.50% | $161.0 million | 3.81% | -170,139 | 13F |
| Capital World Investors | 1,217,169 | 0.47% | $153.7 million | 0.02% | -650,000 | 13F |
| Amundi | 1,168,430 | 0.45% | $147.6 million | 0.04% | +76,856 | 13F |
| American Century Companies Inc. | 1,154,487 | 0.45% | $145.8 million | 0.07% | +338,695 | 13F |
| Bank of America Corp. | 1,118,827 | 0.43% | $141.3 million | 0.01% | -280,548 | 13F |
| Cbre Investment Management Listed Real Assets LLC | 1,072,881 | 0.42% | $135.5 million | 1.89% | -165,034 | 13F |
| Mitsubishi UFJ Asset Management Co., Ltd. | 982,596 | 0.38% | $124.1 million | 0.07% | +74,231 | 13F |
| UBS Group AG | 915,101 | 0.36% | $115.6 million | 0.02% | +113,671 | 13F |
| DekaBank Deutsche Girozentrale | 1,122,500 | 0.44% | $114.2 million | 0.19% | no change | 13F |
| Sumitomo Mitsui Trust Group, Inc. | 896,560 | 0.35% | $113.2 million | 0.07% | -37,162 | 13F |
| Swiss National Bank | 839,061 | 0.33% | $106.0 million | 0.06% | -28,400 | 13F |
| Pictet Asset Management Holding SA | 817,622 | 0.32% | $103.3 million | 0.10% | -47,115 | 13F |
| CIBC Bancorp USA Inc. | 777,480 | 0.30% | $98.2 million | 0.12% | -51,313 | 13F |
| Barclays PLC | 743,343 | 0.29% | $93.9 million | 0.03% | +69,572 | 13F |
| Sei Investments Co. | 697,737 | 0.27% | $88.1 million | 0.08% | -277,055 | 13F |
| Aberdeen Group plc | 691,514 | 0.27% | $87.3 million | 0.12% | +320,306 | 13F |
| APG Asset Management US Inc. | 703,912 | 0.27% | $85.8 million | 0.60% | no change | 13F |
| PGGM Investments | 675,093 | 0.26% | $85.3 million | 2.10% | -694,905 | 13F |
The 50 largest of the 1,177 funds that reported a position in IRM in their 13F for the quarter ended 30 June 2026, by the value each reported.
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Share of all is the fund's part of all the shares the funds reported. Change is shares against the fund's 13F for the quarter before. A 13F lists a manager's long positions in US-listed shares at the quarter's end. What is a 13F?Options the funds reported on IRM
| Fund | Option | Shares under the options | Value of those shares | Quarter ended | Filing |
|---|---|---|---|---|---|
| Citadel Advisors | Calls | 151,300 | $19.1 million | 30 June 2026 | 13F |
| Citadel Advisors | Puts | 134,500 | $17.0 million | 30 June 2026 | 13F |
| Millennium Management | Puts | 64,600 | $8.2 million | 30 June 2026 | 13F |
| Millennium Management | Calls | 30,500 | $3.9 million | 30 June 2026 | 13F |
| Two Sigma Investments | Puts | 2,900 | $366,299 | 30 June 2026 | 13F |
| Two Sigma Investments | Calls | 1,900 | $239,989 | 30 June 2026 | 13F |
A 13F lists calls and puts by the shares they cover and what those shares were worth at the quarter's end, not what the options cost.
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They are not counted in the holdings above. A put gains when the stock falls, a call when it rises, and a fund may hold either to hedge.Schedule 13D and 13G filed on the name, last twelve months
| Filed | Schedule | Who | Holding | Of the class | Event date | Rule or purpose | Filing |
|---|---|---|---|---|---|---|---|
| 7 May 2026 | 13G/A | Cohen & Steers, Inc. and 9 others | 14.6 million | 4.9% | 30 April 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 30 April 2026 | 13G | Vanguard Capital Management and 1 other | 21.9 million | 7.3% | 31 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 29 April 2026 | 13G | Vanguard Portfolio Management and 1 other | 25.1 million | 8.4% | 31 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 27 March 2026 | 13G/A | The Vanguard Group and 1 other | 0 | 0.0% | 13 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 13 February 2026 | 13G/A | Cohen & Steers, Inc. and 9 others | 19.1 million | 6.5% | 31 December 2025 | passive, institutional (13d-1(b)) | EDGAR |
| 14 November 2025 | 13G | Cohen & Steers, Inc. and 9 others | 16.0 million | 5.4% | 30 September 2025 | passive, institutional (13d-1(b)) | EDGAR |
A Schedule 13D is filed by anyone who crosses 5% of a class with intent to influence; a 13G by a passive holder.
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Amendments (/A) report a change, including an exit to zero. Holding and percentage are as the filer stated them on the cover page; the purpose is the filer's own words, cut short. 13D and 13GFails to deliver
| Settlement date | Shares failed | Price | File |
|---|---|---|---|
| 25 August 2026 | 501 | $121.19 | SEC |
| 24 August 2026 | 123 | $122.02 | SEC |
| 21 August 2026 | 330 | $122.94 | SEC |
| 18 August 2026 | 1,523 | $129.90 | SEC |
| 4 August 2026 | 54 | $124.08 | SEC |
| 16 July 2026 | 3,635 | $123.52 | SEC |
Shares that failed to deliver at settlement, per day, from the SEC's half-month files, which arrive about two weeks after the period.