Iron Mountain Inc

IRM

Exchange: NYSE
Industry: Real Estate Investment Trusts
SEC CIK: 0001020569

SEC filings (opens in a new tab)

In the last 90 days, Iron Mountain Inc insiders filed 0 open-market purchases and 8 sales; 1,173 institutions reported holding it in 13F filings for Q2 2026, worth $32.4B in total; no superinvestor holds it.

13F holders, Q3 2026

Institutional positions in Iron Mountain Inc as of Sep 30, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works

Q3 2026 data is still coming in (13F filing deadline: Nov 16, 2026), so these numbers are incomplete.

Institutional holders: 13; +3 vs. Q2 2026
Shares held: 82.5K; −2.51K (−3.0%) vs. Q2 2026
Total value: $9.16M; −$1.58M (−14.7%) vs. Q2 2026
New holders: 3; 3 more added
Sold out: 0; 6 more reduced

1,163 institutions that held it in Q2 2026 haven't filed for Q3 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q2 2026: new holders, sold out and not filed yet

Holders and value by quarter

Institutions reporting IRM on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.

Institutional holders

Value held

Institutions holding IRM and their total value by quarter
Quarter	Holders	Value
Q2 2026	1,173	$32.4B
Q1 2026	1,090	$25.9B
Q4 2025	1,011	$21.4B
Q3 2025	1,017	$25.5B
Q2 2025	1,045	$25.5B
Q1 2025	995	$21.1B
Q4 2024	1,067	$24.9B
Q3 2024	1,056	$28.8B
Q2 2024	967	$22.2B
Q1 2024	938	$19.0B
Q4 2023	891	$16.4B
Q3 2023	831	$13.7B
Q2 2023	817	$12.9B
Q1 2023	790	$12.0B
Q4 2022	782	$11.4B
Q3 2022	743	$10.0B
Q2 2022	767	$10.9B
Q1 2022	777	$12.4B
Q4 2021	754	$12.0B
Q3 2021	711	$9.94B
Q2 2021	687	$9.70B
Q1 2021	630	$8.44B

Institutions, Q3 2026

Shares, value and share of portfolio for each institution holding Iron Mountain Inc; share changes are against Q2 2026.

Institutions holding IRM in Q3 2026
Institution	Shares	Value	% of portfolio	Change in shares	Action
Ankerstar Wealth, LLC	–	–	–	–	Not filed
Geneos Wealth Management Inc.	–	–	–	–	Not filed
E Fund Management (Hong Kong) Co., Ltd.	–	–	–	–	Not filed
Loring Wolcott & Coolidge Fiduciary Advisors LLP	–	–	–	–	Not filed
Park Square Financial Group, LLC	–	–	–	–	Not filed
Capital Analysts, LLC	–	–	–	–	Not filed
Farmers & Merchants Trust Co of Chambersburg PA	–	–	–	–	Not filed
Asset Dedication, LLC	–	–	–	–	Not filed
MJT & Associates Financial Advisory Group, Inc.	–	–	–	–	Not filed
Bullseye Investment Management, LLC	–	–	–	–	Not filed
Mowery & Schoenfeld Wealth Management, LLC	–	–	–	–	Not filed
Wilkerson Advisory Group LLC	–	–	–	–	Not filed
Silver Grove Financial Group, Inc.	–	–	–	–	Not filed
Raffa Wealth Management, LLC	–	–	–	–	Not filed
1620 Investment Advisors, Inc.	–	–	–	–	Not filed
Copia Wealth Management	–	–	–	–	Not filed
South State Corp.	–	–	–	–	Not filed
Trust Co of Vermont	–	–	–	–	Not filed
Ares Financial Consulting, LLC	–	–	–	–	Not filed
Silicon Valley Capital Partners	–	–	–	–	Not filed
Commonwealth Retirement Investments LLC	–	–	–	–	Not filed
Cape Investment Advisory, Inc.	–	–	–	–	Not filed
Marquette Asset Management, LLC	–	–	–	–	Not filed
Hollencrest Capital Management	–	–	–	–	Not filed
Richard W. Paul & Associates, LLC	–	–	–	–	Not filed
Principia Wealth Advisory, LLC	–	–	–	–	Not filed
Holos Integrated Wealth LLC	–	–	–	–	Not filed
Persistent Asset Partners Ltd	–	–	–	–	Not filed
Downshift Financial, LLC	–	–	–	–	Not filed
Brown, Lisle/Cummings, Inc.	–	–	–	–	Not filed
Hughes Financial Services, LLC	–	–	–	–	Not filed
Rialto Wealth Management, LLC	–	–	–	–	Not filed
Ogorek Anthony Joseph	–	–	–	–	Not filed
Johnson Financial Group, Inc.	–	–	–	–	Not filed
Fulcrum Asset Management LLP	–	–	–	–	Not filed
BOK Financial Private Wealth, Inc.	–	–	–	–	Not filed
Thurston, Springer, Miller, Herd & Titak, Inc.	–	–	–	–	Not filed
CBIZ Investment Advisory Services, LLC	–	–	–	–	Not filed
American Capital Advisory, LLC	–	–	–	–	Not filed
NBT Bank N A	–	–	–	–	Not filed
Bay Harbor Wealth Management, LLC	–	–	–	–	Not filed
FWL Investment Management, LLC	–	–	–	–	Not filed
West Paces Advisors Inc.	–	–	–	–	Not filed
Clark Wealth Partners	–	–	–	–	Not filed
Buck Wealth Strategies, LLC	–	–	–	–	Not filed
Millstone Evans Group, LLC	–	–	–	–	Not filed
Burk Holdings LLC	–	–	–	–	Not filed
Kilter Group LLC	–	–	–	–	Not filed
Bokf, NA	–	–	–	–	Not filed
TFC Financial Management	–	–	–	–	Not filed
Aspect Partners, LLC	–	–	–	–	Not filed
Financial Consulate, Inc	–	–	–	–	Not filed
Davis Capital Management	–	–	–	–	Not filed
Washington Trust Advisors, Inc.	–	–	–	–	Not filed
Capital Advisors, Ltd. LLC	–	–	–	–	Not filed
Quaker Wealth Management, LLC	–	–	–	–	Not filed
Motco	–	–	–	–	Not filed
Ameriflex Group, Inc.	–	–	–	–	Not filed
Gs Investments, Inc.	–	–	–	–	Not filed
Bare Financial Services, Inc	–	–	–	–	Not filed
Provenance Wealth Advisors, LLC	–	–	–	–	Not filed
Spectrum Wealth Advisory Group, LLC	–	–	–	–	Not filed
Wolff Wiese Magana LLC	–	–	–	–	Not filed
Morton Brown Family Wealth, LLC	–	–	–	–	Not filed
Leonteq Securities AG	–	–	–	–	Not filed
Raleigh Capital Management Inc.	–	–	–	–	Not filed
Proathlete Wealth Management LLC	–	–	–	–	Not filed
Plante Moran Financial Advisors, LLC	–	–	–	–	Not filed
Strengthening Families & Communities, LLC	–	–	–	–	Not filed
Colonial Trust Co	–	–	–	–	Not filed
Sankala Group LLC	–	–	–	–	Not filed
Beaird Harris Wealth Management, LLC	–	–	–	–	Not filed
DecisionPoint Financial, LLC	–	–	–	–	Not filed
Private Wealth Management Group, LLC	–	–	–	–	Not filed
3 Factor Indexing, LLC	–	–	–	–	Not filed
Highland Investment Advisors LLC	–	–	–	–	Not filed