Iron Mountain
988 hedge funds and large institutions have $21.2B invested in Iron Mountain in 2025 Q4 according to their latest regulatory filings, with 109 funds opening new positions, 320 increasing their positions, 408 reducing their positions, and 105 closing their positions.
New
Increased
Maintained
Reduced
Closed
more call options, than puts
Call options by funds: $ | Put options by funds: $
more ownership
Funds ownership: →
more first-time investments, than exits
New positions opened: | Existing positions closed:
less funds holding
Funds holding: →
17% less capital invested
Capital invested by funds: $25.5B → $21.2B (-$4.26B)
22% less repeat investments, than reductions
Existing positions increased: 320 | Existing positions reduced: 408
46% less funds holding in top 10
Funds holding in top 10: 13 → 7 (-6)
Holders
988
Holding in Top 10
7
Calls
$114M
Puts
$70.6M
Top Buyers
| 1 | +$295M | |
| 2 | +$157M | |
| 3 | +$113M | |
| 4 |
Citadel Advisors
Miami,
Florida
|
+$99M |
| 5 |
Vontobel Holding
Zurich,
Switzerland
|
+$57.2M |
Top Sellers
| 1 | -$296M | |
| 2 | -$94.8M | |
| 3 | -$60.8M | |
| 4 |
UBS Group
Zurich,
Switzerland
|
-$59.9M |
| 5 |
Vanguard Group
Malvern,
Pennsylvania
|
-$58.6M |