13F Insight
DOSSIER · 13F Holders · Q1 2026Financial Services · Real Estate Investment TrustsDefensive growthQuality
IRM

IRON MTN INC DEL

1,135 institutions still hold IRON MTN INC DEL as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 46284V101·Real Estate Investment Trusts·1,135 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 7.2%
vs prior quarter
13F value held
$16.0B
78.0% inst. owned
of float
Holders
1,135
+66 QoQ
filers reporting
Activity
+55 / −58
+974 added · −794 reduced
this quarter
Concentration
21.03%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

1,135 institutions reported IRM in Q1 2026. BlackRock, Inc. leads at 21.0% of the visible book. +66 net new institutions vs prior quarter — accumulation reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$3.4B33.0M0.06%Q1 202602
Vanguard Portfolio Management
CIK 0002100121
$2.6B25.0M0.13%Q1 202603
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$1.9B18.8M0.05%Q1 202604
STATE STREET CORP
CIK 0000093751
$1.8B17.6M0.06%Q1 202605
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$864M8.5M0.05%Q1 202606
FMR LLC
CIK 0000315066
$764M7.5M0.04%Q1 202607
MORGAN STANLEY
CIK 0000895421
$475M4.7M0.03%Q1 202608
PRINCIPAL FINANCIAL GROUP INC
CIK 0001126328
$466M4.6M0.25%Q1 202609
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$465M4.6M0.10%Q1 202610
NORTHERN TRUST CORP
CIK 0000073124· Index
$424M4.2M0.06%Q1 202611
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
CIK 0000884546· Index
$410M4.0M0.06%Q1 202612
Invesco Ltd.
CIK 0000914208
$401M3.9M0.06%Q1 202613
Legal & General Group Plc
CIK 0000764068
$320M3.1M0.07%Q1 202614
Daiwa Securities Group Inc.
CIK 0001481045
$317M3.1M0.91%Q1 202615
DEUTSCHE BANK AG\
CIK 0000948046
$316M3.1M0.10%Q1 202616
PRUDENTIAL FINANCIAL INC
CIK 0001137774
$247M2.4M0.30%Q1 202617
CENTERSQUARE INVESTMENT MANAGEMENT LLC
CIK 0001725296
$236M2.3M2.44%Q1 202618
Contour Asset Management LLC
CIK 0001510669
$235M2.8M5.48%Q4 202519
GOLDMAN SACHS GROUP INC
CIK 0000886982
$226M2.2M0.03%Q1 202620
Vontobel Holding Ltd.
CIK 0001588340
$216M2.1M0.74%Q1 2026
Page 1 of 57
1115 more holders available. Log in →