Iron Mountain
1,000 hedge funds and large institutions have $21.1B invested in Iron Mountain in 2025 Q1 according to their latest regulatory filings, with 89 funds opening new positions, 349 increasing their positions, 404 reducing their positions, and 146 closing their positions.
48% more capital inflows, than outflows
Capital inflows: $2.36B | Capital outflows: $1.59B
2.73% more ownership
Funds ownership: 80.86% → 83.58% (+2.7%)
7% less funds holding
Funds holding: 1,071 → 1,000 (-71)
9% less funds holding in top 10
Funds holding in top 10: 11 → 10 (-1)
14% less repeat investments, than reductions
Existing positions increased: 349 | Existing positions reduced: 404
24% less call options, than puts
Call options by funds: $151M | Put options by funds: $197M
39% less first-time investments, than exits
New positions opened: 89 | Existing positions closed: 146
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
+$445M |
| 2 |
BlackRock
New York
|
+$304M |
| 3 |
CAM
Contour Asset Management
New York
|
+$138M |
| 4 |
Goldman Sachs
New York
|
+$88M |
| 5 |
Point72 Asset Management
Stamford,
Connecticut
|
+$84.3M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
AGF Management
Toronto,
Ontario, Canada
|
-$224M |
| 2 |
TD Asset Management
Toronto,
Ontario, Canada
|
-$169M |
| 3 |
Capital World Investors
Los Angeles,
California
|
-$164M |
| 4 |
Cohen & Steers
New York
|
-$137M |
| 5 |
Wellington Management Group
Boston,
Massachusetts
|
-$46.3M |
IRM Hedge Fund Activity: Q1 2025 in Review
1,000 of the 7,489 institutional investors tracked by Wall St. Rank reported a position in Iron Mountain (IRM) for Q1 2025, worth a combined $21.1B — down 15% from $24.9B a quarter earlier.
Sellers outnumbered buyers: 146 funds closed out of IRM and 89 opened new positions — a net loss of 57 holders — while 404 trimmed existing stakes and 349 added.
The largest buyer was Fidelity Investments, adding an estimated $445M. The largest seller was AGF Management, exiting entirely with an estimated $224M sold.
- 1,000 institutional investors held Iron Mountain (IRM) as of Q1 2025, down from 1,071 in Q4 2024.
- Funds reported $21.1B of Iron Mountain stock for Q1 2025, down 15% quarter-over-quarter.
- 89 funds opened new Iron Mountain positions in Q1 2025 and 146 closed out, a net change of -57 holders.
- The largest Iron Mountain buyer in Q1 2025 was Fidelity Investments, an estimated $445M added.
- The largest Iron Mountain seller in Q1 2025 was AGF Management, an estimated $224M sold.
Based on aggregated 13F filings for Q1 2025.