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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, Q1 2026

Institutional positions in Iron Mountain Inc as of Mar 31, 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

Institutional holders
1,090
+87 vs. Q4 2025
Shares held
253.3M
+47.9M (+23.4%) vs. Q4 2025
Total value
$25.9B
+$8.81B (+51.7%) vs. Q4 2025
New holders
179
401 more added
Sold out
92
348 more reduced

8 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q4 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 holdersQ1 2026: 1,090 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 heldQ1 2026: $25.9B
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, Q1 2026

Shares, value and share of portfolio for each institution holding Iron Mountain Inc; share changes are against Q4 2025.

Institutions holding IRM in Q1 2026
InstitutionSharesValue% of portfolioChange in sharesAction
Prana Capital Management, LP0$00.00%−31,092−100.0%Sold out
Uniplan Investment Counsel, Inc.0$00.00%−30,327−100.0%Sold out
Aurora Investment Counsel0$00.00%−27,420−100.0%Sold out
Shelton Capital Management0$00.00%−25,663−100.0%Sold out
Inceptionr LLC0$00.00%−23,512−100.0%Sold out
IMC-Chicago, LLC0$00.00%−21,647−100.0%Sold out
Kentucky Retirement Systems0$00.00%−18,420−100.0%Sold out
Stevens Capital Management LP0$00.00%−15,214−100.0%Sold out
Elo Mutual Pension Insurance Co0$00.00%−11,697−100.0%Sold out
Coppell Advisory Solutions LLC0$00.00%−11,071−100.0%Sold out
Cynosure Management, LLC0$00.00%−11,000−100.0%Sold out
Unifi Asset Management LP0$00.00%−10,593−100.0%Sold out
Munich Reinsurance Co Stock Corp in Munich0$00.00%−9,791−100.0%Sold out
Diversify Advisory Services, LLC0$00.00%−8,037−100.0%Sold out
Arista Wealth Management, LLC0$00.00%−8,845−100.0%Sold out
Axxcess Wealth Management, LLC0$00.00%−8,086−100.0%Sold out
Mindset Wealth Management, LLC0$00.00%−7,748−100.0%Sold out
D. E. Shaw & Co., Inc.0$00.00%−5,756−100.0%Sold out
Garden State Investment Advisory Services LLC0$00.00%−5,505−100.0%Sold out
Lighthouse Investment Partners, LLC0$00.00%−4,780−100.0%Sold out
Norden Group LLC0$00.00%−4,681−100.0%Sold out
Prelude Capital Management, LLC0$00.00%−4,674−100.0%Sold out
Gsa Capital Partners LLP0$00.00%−4,456−100.0%Sold out
Outlook Wealth Advisors, LLC0$00.00%−4,215−100.0%Sold out
Wellington Grp LLC0$00.00%−4,189−100.0%Sold out
BDFS Capital LLC0$00.00%−4,061−100.0%Sold out
SFG Wealth Management, LLC.0$00.00%−4,063−100.0%Sold out
Capstone Investment Advisors, LLC0$00.00%−3,901−100.0%Sold out
Capital Square, LLC0$00.00%−3,868−100.0%Sold out
Secure Asset Management, LLC0$00.00%−3,773−100.0%Sold out
Penobscot Investment Management Company, Inc.0$00.00%−3,490−100.0%Sold out
Gaddis Premier Wealth Advisors LLC0$00.00%−3,426−100.0%Sold out
Severin Investments, LLC0$00.00%−3,377−100.0%Sold out
Keystone Wealth Services, LLC0$00.00%−3,127−100.0%Sold out
Tiaa Trust, National Association0$00.00%−3,087−100.0%Sold out
National Asset Management, Inc.0$00.00%−3,080−100.0%Sold out
Lecap Asset Management Ltd0$00.00%−2,950−100.0%Sold out
Jefferies Financial Group Inc.0$00.00%−2,942−100.0%Sold out
StoneX Group Inc.0$00.00%−2,901−100.0%Sold out
Duncan Williams Asset Management, LLC0$00.00%−2,562−100.0%Sold out
Cooper Financial Group0$00.00%−2,728−100.0%Sold out
Hutchens & Kramer Investment Management Group, LLC0$00.00%−2,449−100.0%Sold out
Quest Partners LLC0$00.00%−1,833−100.0%Sold out
SageView Advisory Group, LLC0$00.00%−1,747−100.0%Sold out
Blue Bell Private Wealth Management, LLC0$00.00%−1,707−100.0%Sold out
Harbor Capital Advisors, Inc.0$00.00%−1,297−100.0%Sold out
Wellington-Altus USA Inc.0$00.00%−1,041−100.0%Sold out
Elyxium Wealth, LLC0$00.00%−1,004−100.0%Sold out
Safe Harbor Fiduciary, LLC0$00.00%−824−100.0%Sold out
Sentry Investment Management LLC0$00.00%−748−100.0%Sold out
Kohmann Bosshard Financial Services, LLC0$00.00%−545−100.0%Sold out
Strive Financial Group ,LLC0$00.00%−526−100.0%Sold out
Harbor Investment Advisory, LLC0$00.00%−420−100.0%Sold out
Ramirez Asset Management, Inc.0$00.00%−400−100.0%Sold out
Garton & Associates Financial Advisors LLC0$00.00%−305−100.0%Sold out
Reflection Asset Management0$00.00%−284−100.0%Sold out
Tucker Asset Management LLC0$00.00%−180−100.0%Sold out
FSA Advisors, Inc.0$00.00%−14,470−100.0%Sold out
Accordant Advisory Group Inc0$00.00%−137−100.0%Sold out
Optima Capital LLC0$00.00%−124−100.0%Sold out
Strategic Advocates LLC0$00.00%−108−100.0%Sold out
Fourth Dimension Wealth, LLC0$00.00%−75−100.0%Sold out
Capital Analysts, LLC0$00.00%−76−100.0%Sold out
Howard Hughes Medical Institute0$00.00%−63−100.0%Sold out
GGM Financials LLC0$00.00%−58−100.0%Sold out
HFM Investment Advisors, LLC0$00.00%−50−100.0%Sold out
Innovative Advisory Group, LLC0$00.00%−50−100.0%Sold out
T. Rowe Price Investment Management, Inc.0$00.00%−43−100.0%Sold out
Lloyd Advisory Services, LLC.0$00.00%−47−100.0%Sold out
Turning Point Benefit Group, Inc.0$00.00%−38−100.0%Sold out
Commonwealth Retirement Investments LLC0$00.00%−32−100.0%Sold out
Gunpowder Capital Management, LLC dba Oliver Wealth Management0$00.00%−28−100.0%Sold out
Vermillion & White Wealth Management Group, LLC0$00.00%−19−100.0%Sold out
Bay Harbor Wealth Management, LLC0$00.00%−18−100.0%Sold out
Strengthening Families & Communities, LLC0$00.00%−15−100.0%Sold out
Luken Investment Analytics, LLC0$00.00%−5−100.0%Sold out
Winnow Wealth LLC0$00.00%−3−100.0%Sold out
Wealth Watch Advisors, INC0$00.00%−2−100.0%Sold out
United Financial Planning Group LLC0$00.00%−2−100.0%Sold out
Murphy & Mullick Capital Management Corp0$00.00%−1−100.0%Sold out
ROSS\JOHNSON & Associates LLC0$00.00%−1−100.0%Sold out
POM Investment Strategies, LLC0$00.00%−1−100.0%Sold out
Vanguard Group Inc––––Not filed
Norges Bank––––Not filed
CIBC Private Wealth Group, LLC––––Not filed
CIBC World Markets Corp––––Not filed
Forsta Ap-Fonden––––Not filed
Global Retirement Partners, LLC––––Not filed
ORG Partners LLC––––Not filed
DV Equities, LLC––––Not filed