Iron Mountain
1,163 hedge funds and large institutions have $32.3B invested in Iron Mountain in 2026 Q2 according to their latest regulatory filings, with 152 funds opening new positions, 442 increasing their positions, 382 reducing their positions, and 60 closing their positions.
153% more first-time investments, than exits
New positions opened: 152 | Existing positions closed: 60
25% more capital invested
Capital invested by funds: $25.8B → $32.3B (+$6.51B)
17% more funds holding in top 10
Funds holding in top 10: 12 → 14 (+2)
16% more repeat investments, than reductions
Existing positions increased: 442 | Existing positions reduced: 382
7% more funds holding
Funds holding: 1,088 → 1,163 (+75)
1.1% more ownership
Funds ownership: 85% → 86.1% (+1.1%)
50% less call options, than puts
Call options by funds: $172M | Put options by funds: $343M
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
UBS AM
Chicago,
Illinois
|
+$390M |
| 2 |
Goldman Sachs
New York
|
+$74.3M |
| 3 |
Vanguard Portfolio Management
Malvern,
Pennsylvania
|
+$67.8M |
| 4 |
BlackRock
New York
|
+$67.4M |
| 5 |
Voloridge Investment Management
Jupiter,
Florida
|
+$50.6M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Cohen & Steers
New York
|
-$509M |
| 2 |
Daiwa Securities Group
Tokyo,
Japan
|
-$153M |
| 3 |
PI
PGGM Investments
Zeist,
Netherlands
|
-$85.2M |
| 4 |
Capital World Investors
Los Angeles,
California
|
-$79.7M |
| 5 |
EIP
Epoch Investment Partners
New York
|
-$63M |
IRM Hedge Fund Activity: Q2 2026 in Review
1,163 of the 8,279 institutional investors tracked by Wall St. Rank reported a position in Iron Mountain (IRM) for Q2 2026, worth a combined $32.3B — up 25% from $25.8B a quarter earlier.
Buyers outnumbered sellers: 152 funds opened new IRM positions and 60 closed out — a net gain of 92 holders — while 442 added to existing stakes and 382 trimmed.
The largest buyer was UBS AM, adding an estimated $390M. The largest seller was Cohen & Steers, cutting an estimated $509M.
- 1,163 institutional investors held Iron Mountain (IRM) as of Q2 2026, up from 1,088 in Q1 2026.
- Funds reported $32.3B of Iron Mountain stock for Q2 2026, up 25% quarter-over-quarter.
- 152 funds opened new Iron Mountain positions in Q2 2026 and 60 closed out, a net change of +92 holders.
- The largest Iron Mountain buyer in Q2 2026 was UBS AM, an estimated $390M added.
- The largest Iron Mountain seller in Q2 2026 was Cohen & Steers, an estimated $509M sold.
Based on aggregated 13F filings for Q2 2026.