Skip to main content
Livermore
Livermore
ZHEN

Iron Mountain Inc

IRM
Exchange
NYSE
Industry
Real Estate Investment Trusts
SEC CIK
0001020569

In the last 90 days, Iron Mountain Inc insiders filed 0 open-market purchases and 6 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 2025

Institutional positions in Iron Mountain Inc as of Sep 30, 2025. 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

Institutional holders
1,017
−13 vs. Q2 2025
Shares held
250.3M
+5.90M (+2.4%) vs. Q2 2025
Total value
$25.5B
+$450.7M (+1.8%) vs. Q2 2025
New holders
75
370 more added
Sold out
88
390 more reduced

15 institutions that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q2 2025: 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 holdersQ3 2025: 1,017 institutions
Q1 2021: 630 institutionsQ2 2021: 687 institutionsQ3 2021: 711 institutionsQ4 2021: 754 institutionsQ1 2022: 777 institutionsQ2 2022: 767 institutionsQ3 2022: 743 institutionsQ4 2022: 782 institutionsQ1 2023: 790 institutionsQ2 2023: 817 institutionsQ3 2023: 831 institutionsQ4 2023: 891 institutionsQ1 2024: 938 institutionsQ2 2024: 967 institutionsQ3 2024: 1,056 institutionsQ4 2024: 1,067 institutionsQ1 2025: 995 institutionsQ2 2025: 1,045 institutionsQ3 2025: 1,017 institutionsQ4 2025: 1,011 institutionsQ1 2026: 1,090 institutionsQ2 2026: 1,173 institutions
Value heldQ3 2025: $25.5B
Q1 2021: $8.44BQ2 2021: $9.70BQ3 2021: $9.94BQ4 2021: $12.0BQ1 2022: $12.4BQ2 2022: $10.9BQ3 2022: $10.0BQ4 2022: $11.4BQ1 2023: $12.0BQ2 2023: $12.9BQ3 2023: $13.7BQ4 2023: $16.4BQ1 2024: $19.0BQ2 2024: $22.2BQ3 2024: $28.8BQ4 2024: $24.9BQ1 2025: $21.1BQ2 2025: $25.5BQ3 2025: $25.5BQ4 2025: $21.4BQ1 2026: $25.9BQ2 2026: $32.4B
Institutions holding IRM and their total value by quarter
QuarterHoldersValue
Q2 20261,173$32.4B
Q1 20261,090$25.9B
Q4 20251,011$21.4B
Q3 20251,017$25.5B
Q2 20251,045$25.5B
Q1 2025995$21.1B
Q4 20241,067$24.9B
Q3 20241,056$28.8B
Q2 2024967$22.2B
Q1 2024938$19.0B
Q4 2023891$16.4B
Q3 2023831$13.7B
Q2 2023817$12.9B
Q1 2023790$12.0B
Q4 2022782$11.4B
Q3 2022743$10.0B
Q2 2022767$10.9B
Q1 2022777$12.4B
Q4 2021754$12.0B
Q3 2021711$9.94B
Q2 2021687$9.70B
Q1 2021630$8.44B

Institutions, Q3 2025

Shares, value and share of portfolio for each institution holding Iron Mountain Inc; share changes are against Q2 2025.

Institutions holding IRM in Q3 2025
InstitutionSharesValue% of portfolioChange in sharesAction
Capital Advisors, Ltd. LLC10$1.00K0.00%00.0%Unchanged
American Capital Advisory, LLC7$7140.00%−1−12.5%Reduced
TFC Financial Management7$7140.00%00.0%Unchanged
Rialto Wealth Management, LLC5$5100.00%−5−50.0%Reduced
Wolff Wiese Magana LLC5$5100.00%00.0%Unchanged
Guerra Advisors Inc5$5100.00%+5New
Davis Capital Management4$4080.00%+4New
Winnow Wealth LLC3$3060.00%−134−97.8%Reduced
Colonial Trust Co3$3060.00%−6−66.7%Reduced
Palisade Asset Management, LLC3$3060.00%+3New
Proathlete Wealth Management LLC3$3050.00%+3New
DecisionPoint Financial, LLC2$2050.00%00.0%Unchanged
Beaird Harris Wealth Management, LLC2$2040.00%−1−33.3%Reduced
Country Trust Bank2$2040.00%+2New
Private Wealth Management Group, LLC1$1020.00%00.0%Unchanged
Retirement Wealth Solutions LLC0$190.00%0Unchanged
Cloud Capital Management, LLC7$00.00%+7New
Clark Wealth Partners0$00.00%−15−100.0%Sold out
Zurich Insurance Group Ltd0$00.00%−513,791−100.0%Sold out
Voloridge Investment Management, LLC0$00.00%−382,076−100.0%Sold out
Jane Street Group, LLC0$00.00%−149,864−100.0%Sold out
SG Americas Securities, LLC0$00.00%−125,316−100.0%Sold out
Employees Retirement System of Texas0$00.00%−117,324−100.0%Sold out
Weiss Asset Management LP0$00.00%−108,426−100.0%Sold out
AXA S.A.0$00.00%−101,843−100.0%Sold out
HRT Financial LP0$00.00%−83,708−100.0%Sold out
Eisler Capital Management Ltd.0$00.00%−73,981−100.0%Sold out
Brevan Howard Capital Management LP0$00.00%−61,532−100.0%Sold out
Fjarde Ap-Fonden /Fourth Swedish National Pension Fund0$00.00%−50,784−100.0%Sold out
Promethos Capital, LLC0$00.00%−50,782−100.0%Sold out
Prevail Innovative Wealth Advisors, LLC0$00.00%−46,555−100.0%Sold out
Alberta Investment Management Corp0$00.00%−44,900−100.0%Sold out
Tudor Investment Corp Et Al0$00.00%−29,141−100.0%Sold out
Fox Run Management, L.L.C.0$00.00%−25,922−100.0%Sold out
Y-Intercept (Hong Kong) Ltd0$00.00%−21,031−100.0%Sold out
Aster Capital Management (DIFC) Ltd0$00.00%−19,478−100.0%Sold out
Quantbot Technologies LP0$00.00%−17,498−100.0%Sold out
Virtu Financial LLC0$00.00%−11,037−100.0%Sold out
Private Advisory Group LLC0$00.00%−10,236−100.0%Sold out
Genesee Capital Advisors, LLC0$00.00%−8,943−100.0%Sold out
Capstone Investment Advisors, LLC0$00.00%−8,636−100.0%Sold out
V-Square Quantitative Management LLC0$00.00%−8,375−100.0%Sold out
Quantessence Capital LLC0$00.00%−7,978−100.0%Sold out
Foundations Investment Advisors, LLC0$00.00%−7,776−100.0%Sold out
Mangrove Partners0$00.00%−7,088−100.0%Sold out
Landscape Capital Management, L.L.C.0$00.00%−6,742−100.0%Sold out
Alyeska Investment Group, L.P.0$00.00%−6,689−100.0%Sold out
Illinois Municipal Retirement Fund0$00.00%−6,529−100.0%Sold out
Laurion Capital Management LP0$00.00%−5,938−100.0%Sold out
CTC Alternative Strategies, Ltd.0$00.00%−4,795−100.0%Sold out
Catalyst Funds Management Pty Ltd0$00.00%−4,643−100.0%Sold out
Eqis Capital Management, Inc.0$00.00%−4,267−100.0%Sold out
L.M. Kohn & Company0$00.00%−4,147−100.0%Sold out
Centiva Capital, LP0$00.00%−4,031−100.0%Sold out
Highland Capital Management Fund Advisors, L.P.0$00.00%−3,800−100.0%Sold out
SummitTX Capital, L.P.0$00.00%−3,700−100.0%Sold out
Gsa Capital Partners LLP0$00.00%−3,548−100.0%Sold out
Empirical Financial Services, LLC d.b.a. Empirical Wealth Management0$00.00%−3,405−100.0%Sold out
EntryPoint Capital, LLC0$00.00%−3,007−100.0%Sold out
MBB Public Markets I LLC0$00.00%−2,937−100.0%Sold out
ICONIQ Capital, LLC0$00.00%−2,792−100.0%Sold out
Stevens Capital Management LP0$00.00%−2,769−100.0%Sold out
Jaffetilchin Investment Partners, LLC0$00.00%−2,722−100.0%Sold out
XTX Topco Ltd0$00.00%−2,702−100.0%Sold out
Retireful, LLC0$00.00%−2,602−100.0%Sold out
Advisory Alpha, LLC0$00.00%−2,550−100.0%Sold out
Seed Wealth Management, Inc.0$00.00%−2,530−100.0%Sold out
Iron Financial, LLC0$00.00%−2,517−100.0%Sold out
Maven Securities LTD0$00.00%−2,406−100.0%Sold out
Brookwood Investment Group LLC0$00.00%−2,358−100.0%Sold out
Richard P Slaughter Associates Inc0$00.00%−2,229−100.0%Sold out
Cookson Peirce & Co Inc0$00.00%−2,162−100.0%Sold out
Balboa Wealth Partners0$00.00%−2,106−100.0%Sold out
Johnson Investment Counsel Inc0$00.00%−2,033−100.0%Sold out
Wesbanco Bank Inc0$00.00%−2,029−100.0%Sold out
Oliver Luxxe Assets LLC0$00.00%−2,000−100.0%Sold out
Harbour Trust & Investment Management Co0$00.00%−2,000−100.0%Sold out
Moneta Group Investment Advisors LLC0$00.00%−1,963−100.0%Sold out
TPG Advisors LLC0$00.00%−1,954−100.0%Sold out
Modera Wealth Management, LLC0$00.00%−1,951−100.0%Sold out
Pegasus Asset Management, Inc.0$00.00%−1,950−100.0%Sold out
Harvest Fund Management Co., Ltd0$00.00%−1,800−100.0%Sold out
Park Square Financial Group, LLC0$00.00%−1,386−100.0%Sold out
Headlands Technologies LLC0$00.00%−1,122−100.0%Sold out
Mount Yale Investment Advisors, LLC0$00.00%−791−100.0%Sold out
Caitong International Asset Management Co., Ltd0$00.00%−650−100.0%Sold out
Thurston, Springer, Miller, Herd & Titak, Inc.0$00.00%−400−100.0%Sold out
Transce3nd, LLC0$00.00%−362−100.0%Sold out
Loring Wolcott & Coolidge Fiduciary Advisors LLP0$00.00%−355−100.0%Sold out
MeadowBrook Investment Advisors LLC0$00.00%−320−100.0%Sold out
ORG Wealth Partners, LLC0$00.00%−268−100.0%Sold out
Beacon Capital Management, LLC0$00.00%−260−100.0%Sold out
Lazard Asset Management LLC0$00.00%−210−100.0%Sold out
Provenance Wealth Advisors, LLC0$00.00%−189−100.0%Sold out
Twin Peaks Wealth Advisors, LLC0$00.00%−177−100.0%Sold out
PMV Capital Advisers, LLC0$00.00%−140−100.0%Sold out
Bellwether Advisors, LLC0$00.00%−128−100.0%Sold out
BOK Financial Private Wealth, Inc.0$00.00%−109−100.0%Sold out
S&T Bank0$00.00%−75−100.0%Sold out
Marshall & Sterling Wealth Advisors Inc.0$00.00%−67−100.0%Sold out