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Iron Mountain

1,025 hedge funds and large institutions have $25.5B invested in Iron Mountain in 2025 Q2 according to their latest regulatory filings, with 118 funds opening new positions, 387 increasing their positions, 351 reducing their positions, and 61 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
1,025
Holders Change
+43
Holders Change %
+4.38%
% of All Funds
13.74%
Holding in Top 10
16
Holding in Top 10 Change
+6
Holding in Top 10 Change %
+60%
% of All Funds
0.21%
New
118
Increased
387
Reduced
351
Closed
61
Calls
$102M
Puts
$179M
Net Calls
-$77.2M
Net Calls Change
-$30.7M
Name Holding Trade Value Shares
Change
Shares
Change %
RhumbLine Advisers
51
RhumbLine Advisers
Massachusetts
$63.6M -$4.52M -44,107 -7%
ACM
52
AEW Capital Management
Massachusetts
$63.6M -$5.09M -49,590 -7%
D.E. Shaw & Co
53
D.E. Shaw & Co
New York
$59.9M -$23.9M -233,469 -29%
Millennium Management
54
Millennium Management
New York
$59.1M -$12.3M -119,925 -17%
AAMU
55
APG Asset Management US
New York
$58.2M
AllianceBernstein
56
AllianceBernstein
Tennessee
$57.6M -$3.94M -38,428 -6%
Adage Capital Partners
57
Adage Capital Partners
Massachusetts
$57.5M +$24.8M +242,200 +76%
Asset Management One
58
Asset Management One
Japan
$57M +$96K +936 +0.2%
Barclays
59
Barclays
United Kingdom
$55.8M -$10.3M -100,350 -16%
Nomura Asset Management
60
Nomura Asset Management
Japan
$53.1M +$2.01M +19,609 +4%
ZIG
61
Zurich Insurance Group
Switzerland
$52.7M +$52.7M +513,791 New
California Public Employees Retirement System
62
California Public Employees Retirement System
California
$50.7M +$1.51M +14,684 +3%
BTCPP
63
Border to Coast Pensions Partnership
United Kingdom
$49.2M
Universal-Beteiligungs- und Servicegesellschaft
64
Universal-Beteiligungs- und Servicegesellschaft
Germany
$49M +$11.3M +110,583 +30%
National Pension Service
65
National Pension Service
South Korea
$48.8M +$332K +3,240 +0.7%
HRES
66
Heitman Real Estate Securities
Illinois
$47.5M -$7.85M -76,519 -14%
SSA
67
Schonfeld Strategic Advisors
New York
$47.5M +$29.5M +287,249 +163%
UBS AM
68
UBS AM
Illinois
$46.5M +$3.14M +30,606 +7%
California State Teachers Retirement System (CalSTRS)
69
California State Teachers Retirement System (CalSTRS)
California
$46.4M +$2.18M +21,277 +5%
Canada Life
70
Canada Life
Manitoba, Canada
$44.9M -$597K -5,815 -1%
Rockefeller Capital Management
71
Rockefeller Capital Management
New York
$43.9M -$5.64M -48,676 -11%
BNP Paribas Financial Markets
72
BNP Paribas Financial Markets
France
$43.8M -$15.5M -151,549 -26%
ACM
73
Adelante Capital Management
California
$41.4M +$1.32M +12,859 +3%
Raymond James Financial
74
Raymond James Financial
Florida
$40.3M +$581K +5,662 +1%
Balyasny Asset Management
75
Balyasny Asset Management
Illinois
$39.8M -$17M -165,351 -30%