IRON MOUNTAIN INC (IRM)

Corporate structure

146 entities across 34 jurisdictions, 10 in offshore financial centres. Read directly from the company’s own 10-K EX-21 filed 2026-02-12 — see the exhibit.

Financial health

Two standard screens, computed from the XBRL in FY2025 against FY2024. Every test shows the numbers behind it — a score with its inputs hidden is a number you cannot check.

Six-year record

Ownership flow

1 institutions tracked — 1 added, 0 reduced.

From 13F filings, which cover institutions managing over $100m and are filed up to 45 days after the quarter ends — so this is a considered position, not a live one, and it is not the whole shareholder register.

Capital returned

What the company actually paid out and bought back, as reported — the record behind any yield figure.

Other real estate investment trusts companies

IRON MOUNTAIN INC files under SIC 6798 — all 80 real estate investment trusts companies compared on assets and F-score.

Dealer positioning — end of day

Where dealer gamma sat in IRM’s option chain after the close on 2026-09-01, aggregated from the full chain. This is a once-a-day snapshot, not a live read — 421 contracts.

Net gamma (per 1% move)

−$2.8M

Call wall

130

Put wall

115

Spot at capture

115.35

Computed from the listed option chain by my own aggregation, once, after the close — it describes where positioning sat that evening and does not update through the next session. The version that rebuilds per strike while the market is open is the intraday gamma product. Not investment advice.

Questions about IRON MOUNTAIN INC

How many subsidiaries does IRON MOUNTAIN INC file with the SEC?

146, listed in its most recent exhibit 21. They are incorporated across 34 jurisdictions, led by Argentina, Austria, Belgium. 10 of them sit in offshore financial centres. That exhibit is filed with the company's annual report and is the company's own list, not an estimate.

Is IRON MOUNTAIN INC financially healthy?

IRON MOUNTAIN INC scores 4 out of 8 on the Piotroski F-score. Only 8 of the nine tests could be computed from what it filed; the rest need a prior year it has not reported. Every test and the numbers behind it are shown above, so the arithmetic is checkable rather than something you have to take on trust.

Who are the largest institutional holders of IRON MOUNTAIN INC?

Among the managers tracked here, the biggest positions as of the 2026-Q2 13F filings are GEODE CAPITAL MANAGEMENT, LLC (adding). Direction is the change in share count against that manager's own previous filing; managers with no prior filing are left out rather than counted as new buyers.