IRM Institutional Ownership
Who owns Iron Mountain Inc and what the big funds did with it last quarter, from every SEC 13F filing. 1,171 funds reported holding IRM at Jun 30, 2026, together owning 86.4% of the company.
- ▲579 buying vs 436 selling
- ▲Held by funds +1.3 pts
- ▲Funds holding +79
- ▼Superinvestors: 1 added, 4 cut
- ▼Put/call 3.00 to 4.43
What the filings show, not a forecast. Positions can be up to 45 days old and leave out short sales.
Funds holding and ownership
8 quartersQuarter over quarter
all 13F filers| Q2 2026 | This quarter | Q1 2026 | Change |
|---|---|---|---|
| Funds holding | 1,171 | 1,092 | +7.2% |
| In funds' top 10 | 14 | 12 | +16.7% |
| 13F shares | 257M | 253M | +1.5% |
| Held by funds | 86.4% | 85.1% | +1.3 pts |
| New positions | 143 | 160 | −10.6% |
| Increased | 436 | 397 | +9.8% |
| Reduced | 375 | 346 | +8.4% |
| Sold out | 61 | 92 | −33.7% |
| Calls (shares) | 440K | 657K | −33.0% |
| Puts (shares) | 1.9M | 2M | −1.1% |
| Put/call ratio | 4.43 | 3.00 | +47.6% |
Buyers vs sellers
adding or new vs cutting or sold outSuperinvestors in IRM
All superinvestors →
Who owns IRM
share of fund held shares- Index and passive funds49.9%
- Active managers and hedge funds30.5%
- Banks and brokers15.3%
- Pensions, insurers and other4.3%
The top 10 holders own 53.5% of all IRM shares that funds reported. Groups are our own grouping of filers by name.
Put/call ratio
funds' options, market makers left outAbove 1 means funds hold more puts than calls, a sign of hedging or bets on a fall. Options are valued at the underlying shares.
Filed so far for Q3 2026
383 funds changed their position- Principal Financial Group IncTrimmed−1.5M sh
- Vontobel Holding Ltd.Trimmed−1.2M sh
- DekaBank Deutsche GirozentraleTrimmed−912K sh
- Strs OhioNew+130K sh
- Cambridge Investment Research Advisors, Inc.Trimmed−130K sh
🔒 Free account: see all 20.
Top holders
Q2 2026| # | Fund | Of company | Shares | Value | Change |
|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 11.28% | 33.6M | $4.2B | +550K |
| 2 | Vanguard Portfolio Management LLC | 8.59% | 25.6M | $3.2B | +553K |
| 3 | Vanguard Capital Management LLC | 6.37% | 19M | $2.4B | +195K |
| 4 | State Street Corp | 5.92% | 17.6M | $2.2B | +82K |
| 5 | Cohen & Steers, Inc. | 4.04% | 12M | $1.5B | −4.1M |
| 6 | Geode Capital Management, LLC | 2.91% | 8.6M | $1.1B | +163K |
| 7 | Fmr LLC | 2.64% | 7.9M | $994M | +388K |
| 8 | Dimensional Fund Advisors LP | 1.55% | 4.6M | $584M | +73K |
| 9 | Morgan Stanley | 1.49% | 4.4M | $559M | −225K |
| 10 | Principal Financial Group Inc | 1.47% | 4.4M | $552M | −193K |
- Norges Bank+4.2M sh+$532M
- UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AME+3.2M sh+$402M
- Goldman Sachs Group Inc+606K sh+$76.6M
- Vanguard Portfolio Management LLC+553K sh+$69.9M
- BlackRock, Inc.+550K sh+$69.4M
- Voloridge Investment Management, LLC+413K sh+$52.1M
- Fmr LLC+388K sh+$49M
- American Century Companies Inc+339K sh+$42.8M
- Cohen & Steers, Inc.−4.1M sh−$524M
- Daiwa Securities Group Inc.−1.2M sh−$157M
- PGGM Investments−695K sh−$87.8M
- Capital World Investors−650K sh−$82.1M
- Epoch Investment Partners, Inc.−617K sh−$63M
- Prudential Financial Inc−442K sh−$55.8M
- Jane Street Group, LLC−311K sh−$39.3M
- Bank of America Corp /de/−281K sh−$35.4M
IRM institutional ownership FAQ
Who owns the most IRM stock?
In Q2 2026 13F filings the largest holder of IRM was BlackRock, Inc., followed by Vanguard Portfolio Management LLC and Vanguard Capital Management LLC. Index fund managers are usually the biggest holders of large companies.
What percentage of IRM is owned by institutions?
Funds that file 13F reports held 86.4% of IRM's shares at Jun 30, 2026, compared with 85.1% a quarter earlier. That counts every manager with more than $100 million in US stocks.
Are hedge funds buying IRM?
In Q2 2026, 579 funds bought IRM (143 of them new positions) and 436 sold (61 sold out completely). Among well known investors, 1 added and 4 cut. Our fund sentiment for IRM is neutral.
What is IRM's institutional put/call ratio?
Funds reported $246M of IRM puts against $55.6M of calls, a put/call ratio of 4.43 (3.00 the quarter before). Market makers and bank trading desks are left out, since their options are mostly hedges.
How current is this IRM ownership data?
13F filings show holdings at the end of each quarter and are due within 45 days, so positions can be up to six weeks old when they appear. We add each new filing within minutes, and the "filed so far" list shows funds that have already reported the next quarter.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Fund sentiment summarises what 13F filings show and is not a forecast. Holdings come from SEC Form 13F filings as reported and show positions at the end of the quarter, up to 45 days before the filing. A 13F leaves out short positions, cash, bonds and most foreign holdings. See all hedge fund holdings.