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Institutional ownership intelligence
Schedule 13G/A

IRM Schedule 13G/A filing by BlackRock

BlackRock reported beneficial ownership of 29.9M shares, representing 10.2% of IRON MOUNTAIN INC in this filing.

FiledSep 10, 2024
Ownership dateAug 31, 2024
Reported shares29.9M
Reported ownership10.2%
Ownership details

Voting and dispositive power reported in the filing

These figures describe the reporting filer’s disclosed voting and investment authority. They should be read together with the reported share count and percentage.

Sole voting power 29.9M
Shared voting power 29.9M
Sole dispositive power 29.9M
Shared dispositive power 29.9M
Compared with the prior filing

How the reported position changed

This compares the current filing with the previous tracked Schedule 13 filing from the same reporting CIK for IRM. A change between filings does not by itself establish when shares were bought or sold.

Previous filingJan 26, 2024
Reported share change+6,579,362
Ownership percentage change+2.2 pts
Previous filingThis filing
Reported shares23.3M29.9M
Reported ownership8%10.2%
Price context

Price dates alongside the ownership filing

Price data provides market context around the disclosure. It does not identify the filer’s actual transaction price.

Close near filing date$114.16as of Sep 10, 2024
Latest tracked price$125.51as of Aug 4, 2026
Source

Original filing and accession

Use the SEC filing as the primary source when you need the complete disclosure, footnotes, exhibits, or reporting-person details.

Reporting filer
BlackRock
CIK
CIK0001364742
Accession
0001086364-24-008643
Form
Schedule 13G/A
Read the filing in context

Understand what a Schedule 13 filing does—and does not—tell you.