Iron Mountain Inc
IRM · US
Iron Mountain Inc is held by 3 of the 24 tracked investors in their latest 13F filings. The largest position is Norges Bank's at $532M, 0.05% of that portfolio. Versus the prior quarter, 2 added, 1 trimmed and 0 bought new.
Big investors holding this stock
Latest 13F of the 24 tracked investors. Common shares only.
| Investor | Value ($) | vs prior quarter |
|---|---|---|
| Norges Bank weight 0.05% · Q2 2026 |
532M | ▼ 5% |
| National Pension Service (Korea) weight 0.04% · Q2 2026 |
57.4M | ▲ 6% |
| Korea Investment Corporation weight 0.05% · Q2 2026 |
27.6M | ▲ 82% |
Questions
Which big investors own Iron Mountain Inc?
Norges Bank ($532M), National Pension Service (Korea) ($57.4M), Korea Investment Corporation ($27.6M), per their latest 13F filings.
Does Warren Buffett own Iron Mountain Inc?
Berkshire Hathaway did not report it in its latest 13F.
Does Korea's National Pension Service own Iron Mountain Inc?
Yes, $57.4M as of 2026-06-30 (0.04% of its US holdings).
Restated and computed from SEC (13F, 13D/G, Form 4) and DART filings and NPS public data. Filings describe a past date and may differ from current holdings (13F: quarter end, up to 45 days later). Not investment advice.
Sources: SEC EDGAR, DART, data.go.kr (NPS), OpenFIGI. See Methodology for how figures are computed.