Iron Mountain
995 hedge funds and large institutions have $21.1B invested in Iron Mountain in 2025 Q1 according to their latest regulatory filings, with 88 funds opening new positions, 349 increasing their positions, 402 reducing their positions, and 143 closing their positions.
2.71% more ownership
Funds ownership: 80.87% → 83.58% (+2.7%)
7% less funds holding
Funds holding: 1,065 → 995 (-70)
9% less funds holding in top 10
Funds holding in top 10: 11 → 10 (-1)
13% less repeat investments, than reductions
Existing positions increased: 349 | Existing positions reduced: 402
17% less capital invested
Capital invested by funds: $25.4B → $21.1B (-$4.31B)
24% less call options, than puts
Call options by funds: $151M | Put options by funds: $197M
38% less first-time investments, than exits
New positions opened: 88 | Existing positions closed: 143
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 |
AM
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
995 of the 7,459 institutional investors tracked by Wall St. Rank reported a position in Iron Mountain (IRM) for Q1 2025, worth a combined $21.1B — down 17% from $25.4B a quarter earlier.
Sellers outnumbered buyers: 143 funds closed out of IRM and 88 opened new positions — a net loss of 55 holders — while 402 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.
- 995 institutional investors held Iron Mountain (IRM) as of Q1 2025, down from 1,065 in Q4 2024.
- Funds reported $21.1B of Iron Mountain stock for Q1 2025, down 17% quarter-over-quarter.
- 88 funds opened new Iron Mountain positions in Q1 2025 and 143 closed out, a net change of -55 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.