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BLAIR WILLIAM & CO/IL

Position in IRM — Iron Mountain Inc

CIK 902367 CHICAGO, IL

Position in IRM

as of Jun 30, 2026 · filed Aug 11, 2026
Position Value
$28,340,932
+$5,334,000 QoQ
Shares Held
224,376
-0.4% QoQ
Ownership
0.075%
of shares outstanding
% of Portfolio
0.09%
of 13F equity value
Holder Rank
#107
of 1,151 holders
Holding Since
Mar 2020
26 quarters on record
Voting authority Sole 85% Shared 0% None 15%

Common Shares in IRM Over Time

Shares Held

Position Value (USD)

Position in REIT - Specialty

Real Estate · as of Jun 30, 2026

BLAIR WILLIAM & CO/IL holds $138,819,798 across 10 REIT - Specialty names. IRM ranks #2 (20.4% of the industry book) .

# Ticker Company Shares Value (USD) Open
2 IRM
Iron Mountain Inc
This page
224,376 $28,340,932

All Filings in IRM

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26 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $28,340,932 224,376
2026-03-31 $23,006,932 225,249
2025-12-31 $19,765,740 238,285
2025-09-30 $32,458,715 318,410
2025-06-30 $32,220,314 314,130
2025-03-31 $28,439,489 330,538
2024-12-31 $35,161,607 334,522
2024-09-30 $39,682,565 333,944
2024-06-30 $31,200,844 348,146
2024-03-31 $28,026,256 349,411
2023-12-31 $23,729,168 339,085
2023-09-30 $21,035,015 353,827
2023-06-30 $20,037,629 352,651
2023-03-31 $18,966,700 358,471
2022-12-31 $18,023,815 361,561
2022-09-30 $15,690,474 356,845
2022-06-30 $13,374,315 274,683
2022-03-31 $15,418,552 278,263
2021-12-31 $14,149,927 270,398
2021-09-30 $11,479,837 264,208
2021-06-30 $10,800,868 255,219
2021-03-31 $9,994,550 270,050
2020-12-31 $9,801,539 332,481
2020-09-30 $8,552,868 319,256
2020-06-30 $7,200,624 275,886
2020-03-31 $9,017,153 378,872