Iron Mountain Incorporated (IRM) Institutional Ownership & Insider Trading

1,166 institutions reported holding Iron Mountain Incorporated shares in 13F filings for the quarter ended 2026-06-30, according to EquiReason's reading of their SEC filings. 78 insider trades on Form 4 since 2025-10-01.

Source: SEC EDGAR filings · figures as of 2026-06-30 · read by EquiReason

IRMIron Mountain IncorporatedFollow IRM — free

REIT - Specialty · Real Estate

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Market cap: 32.7B
P/E TTM: 78.5
Dividend yield: 3.1%
52-week: —
Next earnings: 5 Nov, in 12 days

Institutions · all 13F filers

quarter to 30 Jun 2026 · filers in both quarters

1,166 institutions held 86.4% of the shares. Across filers that reported both quarters, shares held changed -0.2%.

Largest moves, shares (millions)

Institutional flow by quarter

net shares added or trimmed, millions · filers in both quarters

Quarter	Holders	Shares held, M	Change	Increased	New	Decreased	Closed
Jun 26	1,166	257	-0.2%	348	114	319	43
Mar 26	1,077	253	-0.6%	330	142	304	64
Dec 25	986	256	-0.3%	269	51	348	94
Sep 25	991	252	+2.3%	283	47	313	66
Jun 25	1,024	249	+1.6%	314	92	295	41
Mar 25	966	240	+3.3%	271	58	331	124
Dec 24	1,028	243	-0.4%	270	57	354	85
Sep 24	1,021	238	-6.0%	235	121	348	43

Iron Mountain Incorporated — questions

Who owns Iron Mountain Incorporated stock?: 1,166 institutions reported Iron Mountain Incorporated shares in 13F filings for the quarter ended 2026-06-30. The largest: BlackRock, Inc. (11.3%), VANGUARD PORTFOLIO MANAGEMENT LLC (8.6%), VANGUARD CAPITAL MANAGEMENT LLC (6.4%).
Are Iron Mountain Incorporated insiders buying or selling?: 78 insider trades on Form 4 since 2025-10-01; the full list, with dates, people and plan status, is on this page.

Every figure on this page comes from Iron Mountain Incorporated's own SEC filings — see them on SEC EDGAR. Price data is licensed and shown only inside the product.

How these figures are read: methodology · EquiReason.

Important information. Figures on this page are taken from filings submitted to the U.S. Securities and Exchange Commission (SEC) and processed automatically by EquiReason. They may contain errors, omissions or delays, and EquiReason makes no representation or warranty as to their accuracy, completeness or timeliness. Always verify figures against the original filing on SEC EDGAR before relying on them.

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