Iron Mountain
1,088 hedge funds and large institutions have $25.8B invested in Iron Mountain in 2026 Q1 according to their latest regulatory filings, with 178 funds opening new positions, 398 increasing their positions, 351 reducing their positions, and 89 closing their positions.
100% more first-time investments, than exits
New positions opened: 178 | Existing positions closed: 89
71% more funds holding in top 10
Funds holding in top 10: 7 → 12 (+5)
21% more capital invested
Capital invested by funds: $21.4B → $25.8B (+$4.44B)
13% more repeat investments, than reductions
Existing positions increased: 398 | Existing positions reduced: 351
8% more funds holding
Funds holding: 1,009 → 1,088 (+79)
2.12% less ownership
Funds ownership: 87.12% → 85% (-2.1%)
46% less call options, than puts
Call options by funds: $139M | Put options by funds: $259M
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Morgan Stanley
New York
|
+$105M |
| 2 |
AQR Capital Management
Greenwich,
Connecticut
|
+$91.8M |
| 3 |
Jane Street
New York
|
+$70.4M |
| 4 |
Goldman Sachs
New York
|
+$68.8M |
| 5 |
State Street
Boston,
Massachusetts
|
+$65.9M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Cohen & Steers
New York
|
-$272M |
| 2 |
Pictet Asset Management
Carouge,
Switzerland
|
-$142M |
| 3 |
CAM
Contour Asset Management
New York
|
-$138M |
| 4 |
Citadel Advisors
Miami,
Florida
|
-$74.1M |
| 5 |
Daiwa Securities Group
Tokyo,
Japan
|
-$54.4M |
IRM Hedge Fund Activity: Q1 2026 in Review
1,088 of the 8,173 institutional investors tracked by Wall St. Rank reported a position in Iron Mountain (IRM) for Q1 2026, worth a combined $25.8B — up 21% from $21.4B a quarter earlier.
Buyers outnumbered sellers: 178 funds opened new IRM positions and 89 closed out — a net gain of 89 holders — while 398 added to existing stakes and 351 trimmed.
The largest buyer was Morgan Stanley, adding an estimated $105M. The largest seller was Cohen & Steers, cutting an estimated $272M.
- 1,088 institutional investors held Iron Mountain (IRM) as of Q1 2026, up from 1,009 in Q4 2025.
- Funds reported $25.8B of Iron Mountain stock for Q1 2026, up 21% quarter-over-quarter.
- 178 funds opened new Iron Mountain positions in Q1 2026 and 89 closed out, a net change of +89 holders.
- The largest Iron Mountain buyer in Q1 2026 was Morgan Stanley, an estimated $105M added.
- The largest Iron Mountain seller in Q1 2026 was Cohen & Steers, an estimated $272M sold.
Based on aggregated 13F filings for Q1 2026.