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BROWN BROTHERS HARRIMAN & CO

Position in IRM — Iron Mountain Inc

CIK 14661 NEW YORK, NY

Position in IRM

as of Jun 30, 2026 · filed Aug 12, 2026
Position Value
$1,030,310
+$496,016 QoQ
Shares Held
8,157
+55.9% QoQ
Ownership
0.003%
of shares outstanding
% of Portfolio
0.01%
of 13F equity value
Holder Rank
#515
of 1,151 holders
Holding Since
Mar 2020
24 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in IRM Over Time

Shares Held

Position Value (USD)

Position in REIT - Specialty

Real Estate · as of Jun 30, 2026

BROWN BROTHERS HARRIMAN & CO holds $9,454,258 across 10 REIT - Specialty names. IRM ranks #4 (10.9% of the industry book) .

# Ticker Company Shares Value (USD) Open
4 IRM
Iron Mountain Inc
This page
8,157 $1,030,310

All Filings in IRM

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24 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $1,030,310 8,157
2026-03-31 $534,294 5,231
2025-12-31 $173,697 2,094
2025-09-30 $171,259 1,680
2025-06-30 $563,622 5,495
2025-03-31 $428,479 4,980
2024-12-31 $584,096 5,557
2024-09-30 $1,014,214 8,535
2024-06-30 $764,368 8,529
2024-03-31 $702,398 8,757
2023-12-31 $612,814 8,757
2023-09-30 $520,603 8,757
2023-06-30 $273,701 4,817
2023-03-31 $255,026 4,820
2022-12-31 $230,955 4,633
2022-09-30 $208,066 4,732
2022-06-30 $230,401 4,732
2022-03-31 $256,714 4,633
2021-12-31 $243,700 4,657
2021-09-30 $202,346 4,657
2021-06-30 $197,084 4,657
2021-03-31 $172,207 4,653
2020-12-31 $136,462 4,629
2020-03-31 $476 20