DOSSIER · 13F Holders · Q1 2026Financial Services · Real Estate Investment Trusts
IRM

IRON MTN INC DEL

1,149 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·1,149 13F holders·last filed Mar 31, 2026
Market cap
13F value held
$17.5B
visible holders
Holders
1,149
filers reporting
Concentration
19.31%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

1,149 institutions reported IRM in Q1 2026. BlackRock, Inc. leads at 19.3% of the visible book.

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 2026
02
Vanguard Portfolio Management
CIK 0002100121· Index
$2.6B25.0M0.13%Q1 2026
03
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$1.9B18.8M0.05%Q1 2026
04
STATE STREET CORP
CIK 0000093751
$1.8B17.6M0.06%Q1 2026
05
COHEN & STEERS, INC.
CIK 0001284812
$1.7B16.2M2.87%Q1 2026
06
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$864M8.5M0.05%Q1 2026
07
FMR LLC
CIK 0000315066
$764M7.5M0.04%Q1 2026
08
MORGAN STANLEY
CIK 0000895421
$475M4.7M0.03%Q1 2026
09
PRINCIPAL FINANCIAL GROUP INC
CIK 0001126328
$466M4.6M0.25%Q1 2026
10
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$465M4.6M0.10%Q1 2026
11
NORTHERN TRUST CORP
CIK 0000073124· Index
$424M4.2M0.06%Q1 2026
12
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
CIK 0000884546· Index
$410M4.0M0.06%Q1 2026
13
Invesco Ltd.
CIK 0000914208
$401M3.9M0.04%Q1 2026
14
Legal & General Group Plc
CIK 0000764068
$320M3.1M0.07%Q1 2026
15
Daiwa Securities Group Inc.
CIK 0001481045
$317M3.1M0.91%Q1 2026
16
DEUTSCHE BANK AG\
CIK 0000948046
$316M3.1M0.10%Q1 2026
17
PRUDENTIAL FINANCIAL INC
CIK 0001137774
$247M2.4M0.30%Q1 2026
18
CENTERSQUARE INVESTMENT MANAGEMENT LLC
CIK 0001725296
$236M2.3M2.44%Q1 2026
19
Contour Asset Management LLC
CIK 0001510669
$235M2.8M5.48%Q4 2025
20
GOLDMAN SACHS GROUP INC
CIK 0000886982
$226M2.2M0.03%Q1 2026
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Insiders at IRON MTN INC DEL
Samuels Theodore R. IiSimons DoyleMeaney William LBorges DanielRakowich Walter CKidd MarkFord Monte EMatlock Robin