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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.

Q1 2026 vs. Q4 2025

How the institutions holding Iron Mountain Inc changed between Q4 2025 and Q1 2026.

All holders in Q1 2026All holders in Q4 2025

13F holders of IRM: Q4 2025 compared with Q1 2026
MeasureQ4 2025Of which not filed for Q1 2026Q1 2026Change
Holders1,01181,090+87
Shares257.3M52.0M253.3M+47.9M (+23.4%)
Value$21.4B$4.31B$25.9B+$8.81B (+51.7%)

8 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so the changes leave them out.

New holders (179)

Institutions that held Iron Mountain Inc at the end of Q1 2026 but not at the end of Q4 2025.

Showing the largest 100 of 179 by value.

Institutions new to IRM in Q1 2026
InstitutionSharesValue% of portfolio
Vanguard Portfolio Management LLC25,015,557$2.56B0.13%
Vanguard Capital Management LLC18,758,889$1.92B0.05%
Vanguard Fiduciary Trust Co1,652,888$168.8M0.04%
CIBC Bancorp USA Inc.828,793$84.6M0.11%
Jane Street Group, LLC707,441$72.3M0.08%
Vanguard Global Advisers, LLC647,775$66.2M0.04%
Bamco Inc525,270$53.7M0.16%
Vanguard Asset Management, Ltd504,995$51.6M0.04%
Colony Capital, Inc.504,021$51.5M3.27%
Clark Capital Management Group, Inc.468,365$47.8M0.30%
Vanguard Investments Australia, Ltd.343,334$35.1M0.10%
Hudson Bay Capital Management LP190,884$19.5M0.12%
SG Capital Management LLC163,636$16.7M1.38%
Boothbay Fund Management, LLC141,437$14.4M0.34%
HRT Financial LP128,338$13.1M0.03%
Walleye Capital LLC119,864$12.2M0.08%
Mirova83,040$8.48M0.34%
Qube Research & Technologies Ltd81,478$8.32M0.01%
Adams Diversified Equity Fund, Inc.80,800$8.25M0.29%
SEB Asset Management AB69,230$7.07M0.03%
Oak Thistle LLC53,641$5.48M0.53%
Anson Funds Management LP42,200$4.31M0.57%
ING Groep NV36,276$3.71M0.02%
Gradient Investments LLC26,439$2.70M0.04%
XTX Topco Ltd25,465$2.60M0.05%
Jain Global LLC24,108$2.46M0.03%
Susquehanna Portfolio Strategies, LLC23,278$2.38M0.04%
Edgestream Partners, L.P.20,057$2.05M0.07%
GEM Realty Capital19,231$1.96M0.19%
Blue Sparrow, LLC19,130$1.95M0.03%
Fox Run Management, L.L.C.14,738$1.44M0.25%
Walleye Trading LLC12,980$1.33M0.03%
Saudi Central Bank10,911$1.11M0.02%
Brighton Jones LLC10,675$1.09M0.02%
Landscape Capital Management, L.L.C.9,839$1.00M0.06%
Emerald Investment Advisers, LLC9,818$1.00M0.09%
Jump Financial, LLC9,234$943.2K0.01%
Nelson, Van Denburg & Campbell Wealth Management Group, LLC6,889$703.6K0.02%
Buckingham Strategic Partners6,716$686.1K0.01%
Aigen Investment Management, LP6,255$638.9K0.16%
Machina Capital S.A.S.5,910$603.6K0.12%
Bridgewater Associates, LP4,694$479.4K0.00%
Wealthspire Advisors, LLC4,284$437.6K0.00%
Waddell & Associates, LLC4,108$419.6K0.02%
Advisory Alpha, LLC4,076$416.4K0.01%
Gateway Wealth Partners, LLC4,017$410.3K0.02%
Empirical Financial Services, LLC d.b.a. Empirical Wealth Management3,780$386.1K0.01%
Significant Wealth Partners LLC3,693$377.2K0.46%
Gateway Investment Advisers LLC3,557$363.3K0.00%
Simmons Bank3,545$362.1K0.02%
Bull Harbor Capital LLC3,507$358.2K0.10%
Fort Point Capital Partners LLC3,463$356.4K0.05%
VestGen Advisors, LLC2,821$356.1K0.01%
Frec Markets, Inc.3,462$353.6K0.06%
Great Valley Advisor Group, Inc.3,453$352.4K0.01%
Fulton Bank, N.A.3,448$352.2K0.01%
Brevan Howard Capital Management LP3,272$334.2K0.00%
Pinnacle Financial Partners, Inc.3,204$327.3K0.00%
TradeLink Capital LLC3,083$315.0K2.38%
Virtu Financial LLC3,006$307.0K0.01%
Ashton Thomas Private Wealth, LLC2,988$305.2K0.01%
Baker Avenue Asset Management, LP2,890$295.2K0.01%
HBK Sorce Advisory LLC2,276$293.2K0.01%
Wealth Alliance2,801$286.1K0.03%
Optas, LLC2,750$280.9K0.04%
Cardiff Park Advisors, LLC2,725$278.4K0.02%
Advisor OS, LLC2,723$278.1K0.02%
Patriot Financial Group Insurance Agency, LLC2,716$277.4K0.02%
SeaBridge Investment Advisors LLC2,711$276.9K0.05%
AlphaStar Capital Management, LLC2,666$272.3K0.02%
Parcion Private Wealth LLC2,666$272.3K0.02%
Evolve Private Wealth, LLC2,591$264.6K0.01%
Mattson Financial Services, LLC2,516$257.0K0.06%
Xxi Wealth, LLC2,506$256.0K0.14%
Brown Financial Advisors2,490$254.3K0.10%
Fielder Capital Group LLC2,437$248.9K0.05%
Bridgelight Financial Advisors, Inc.2,429$248.1K0.21%
AssuredPartners Investment Advisors, LLC2,352$245.4K0.03%
Renaissance Technologies LLC2,400$245.1K0.00%
DV Trading LLC2,400$245.1K0.02%
Bedel Financial Consulting, Inc.2,392$244.3K0.03%
Tiaa-Cref Individual & Institutional Services, LLC2,381$243.2K0.00%
Pinnacle Associates Ltd2,379$243.0K0.00%
Beese Fulmer Investment Management, Inc.2,350$242.1K0.02%
Jacobi Capital Management LLC2,363$241.3K0.01%
Schmidt P J Investment Management Inc2,360$241.1K0.04%
Prosperity Consulting Group, LLC2,360$241.1K0.01%
Armistice Capital, LLC2,351$240.1K0.01%
Intrua Financial, LLC2,349$239.9K0.03%
Sentinus, LLC2,330$238.0K0.02%
Turtle Creek Wealth Advisors, LLC2,324$237.4K0.02%
Strategic Blueprint, LLC2,316$236.6K0.01%
Mayflower Financial Advisors, LLC2,315$236.5K0.03%
Fortress Private Ledger, LLC2,306$235.5K0.07%
Soltis Investment Advisors LLC2,304$235.3K0.02%
Saxony Capital Management, LLC2,283$233.2K0.14%
Fayez Sarofim & Co2,280$232.9K0.00%
Smith, Moore & Co.2,251$229.9K0.02%
Mystic Asset Management, Inc.2,247$229.5K0.05%
Quantbot Technologies LP2,233$228.1K0.01%

Sold out (92)

Institutions that held Iron Mountain Inc at the end of Q4 2025 and filed for Q1 2026 without it.

Institutions that sold out of IRM in Q1 2026
InstitutionShares, Q4 2025Value, Q4 2025
Verition Fund Management LLC208,951$17.3M
SG Americas Securities, LLC137,582$11.4M
Two Sigma Advisers, LP130,324$10.8M
Canada Pension Plan Investment Board88,145$7.31M
Polar Asset Management Partners Inc.86,400$7.17M
Man Group plc57,346$4.76M
Skandinaviska Enskilda Banken AB (publ)54,151$4.49M
Sora Investors LLC47,345$3.93M
Connor, Clark & Lunn Investment Management Ltd.39,394$3.27M
Fieldview Capital Management, LLC36,518$3.03M
Prana Capital Management, LP31,092$2.58M
Uniplan Investment Counsel, Inc.30,327$2.52M
Aurora Investment Counsel27,420$2.27M
Shelton Capital Management25,663$2.13M
Inceptionr LLC23,512$1.95M
IMC-Chicago, LLC21,647$1.80M
Kentucky Retirement Systems18,420$1.53M
Stevens Capital Management LP15,214$1.26M
Elo Mutual Pension Insurance Co11,697$970.3K
Coppell Advisory Solutions LLC11,071$922.9K
Cynosure Management, LLC11,000$912.5K
Unifi Asset Management LP10,593$878.7K
Munich Reinsurance Co Stock Corp in Munich9,791$816.2K
Diversify Advisory Services, LLC8,037$771.0K
Arista Wealth Management, LLC8,845$733.7K
Axxcess Wealth Management, LLC8,086$670.7K
Mindset Wealth Management, LLC7,748$642.7K
D. E. Shaw & Co., Inc.5,756$477.5K
Garden State Investment Advisory Services LLC5,505$461.3K
Lighthouse Investment Partners, LLC4,780$396.5K
Norden Group LLC4,681$388.3K
Prelude Capital Management, LLC4,674$387.7K
Gsa Capital Partners LLP4,456$370.0K
Outlook Wealth Advisors, LLC4,215$349.7K
Wellington Grp LLC4,189$347.5K
BDFS Capital LLC4,061$340.3K
SFG Wealth Management, LLC.4,063$337.0K
Capstone Investment Advisors, LLC3,901$323.6K
Capital Square, LLC3,868$320.8K
Secure Asset Management, LLC3,773$313.0K
Penobscot Investment Management Company, Inc.3,490$289.5K
Gaddis Premier Wealth Advisors LLC3,426$284.1K
Severin Investments, LLC3,377$280.2K
Keystone Wealth Services, LLC3,127$259.4K
Tiaa Trust, National Association3,087$256.1K
National Asset Management, Inc.3,080$255.5K
Lecap Asset Management Ltd2,950$244.7K
Jefferies Financial Group Inc.2,942$244.0K
StoneX Group Inc.2,901$241.7K
Duncan Williams Asset Management, LLC2,562$230.7K
Cooper Financial Group2,728$226.3K
Hutchens & Kramer Investment Management Group, LLC2,449$203.1K
Quest Partners LLC1,833$152.0K
SageView Advisory Group, LLC1,747$144.9K
Blue Bell Private Wealth Management, LLC1,707$141.6K
Harbor Capital Advisors, Inc.1,297$108.0K
Wellington-Altus USA Inc.1,041$86.4K
Elyxium Wealth, LLC1,004$83.3K
Safe Harbor Fiduciary, LLC824$68.4K
Sentry Investment Management LLC748$62.0K
Kohmann Bosshard Financial Services, LLC545$45.2K
Strive Financial Group ,LLC526$43.6K
Harbor Investment Advisory, LLC420$34.8K
Ramirez Asset Management, Inc.400$33.2K
Garton & Associates Financial Advisors LLC305$25.3K
Reflection Asset Management284$23.6K
Tucker Asset Management LLC180$14.9K
FSA Advisors, Inc.14,470$14.7K
Accordant Advisory Group Inc137$11.4K
Optima Capital LLC124$10.4K
Strategic Advocates LLC108$8.97K
Fourth Dimension Wealth, LLC75$6.22K
Capital Analysts, LLC76$6.00K
Howard Hughes Medical Institute63$5.23K
GGM Financials LLC58$4.85K
HFM Investment Advisors, LLC50$4.15K
Innovative Advisory Group, LLC50$4.15K
T. Rowe Price Investment Management, Inc.43$4.00K
Lloyd Advisory Services, LLC.47$3.90K
Turning Point Benefit Group, Inc.38$3.15K
Commonwealth Retirement Investments LLC32$2.66K
Gunpowder Capital Management, LLC dba Oliver Wealth Management28$2.32K
Vermillion & White Wealth Management Group, LLC19$1.58K
Bay Harbor Wealth Management, LLC18$1.51K
Strengthening Families & Communities, LLC15$1.24K
Luken Investment Analytics, LLC5$415
Winnow Wealth LLC3$249
Wealth Watch Advisors, INC2$166
United Financial Planning Group LLC2$166
Murphy & Mullick Capital Management Corp1$83
ROSS\JOHNSON & Associates LLC1$83
POM Investment Strategies, LLC1$51

Not filed for Q1 2026 yet (8)

Institutions that held Iron Mountain Inc at the end of Q4 2025 and haven't filed a 13F for Q1 2026. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding IRM in Q4 2025 that haven't filed for Q1 2026
InstitutionShares, Q4 2025Value, Q4 2025
Vanguard Group Inc46,627,483$3.87B
Norges Bank4,447,133$368.9M
CIBC Private Wealth Group, LLC677,651$56.2M
CIBC World Markets Corp115,456$9.58M
Forsta Ap-Fonden70,900$5.88M
Global Retirement Partners, LLC13,109$1.09M
ORG Partners LLC966$80.1K
DV Equities, LLC408$33.8K