IRON MOUNTAIN INC (IRM) Institutional Ownership Changes & 13F Activity

IRON MOUNTAIN INC (IRM) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Renaissance Technologies LLC, Sequoia Financial Advisors, and Parnassus Endeavor Fund.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2026Renaissance Technologies LLCSell-83,3632,400$245,136
Q1 2026Sequoia Financial AdvisorsBuy1,19110,464$1,068,834
Q4 2025Sequoia Financial AdvisorsSell-8419,273$769,181
Q3 2025Sequoia Financial AdvisorsSell-55410,114$1,031,023
Q2 2025Sequoia Financial AdvisorsBuy1,79510,668$1,094,248
Q1 2025Renaissance Technologies LLCBuy5,16385,763$7,379,049
Q1 2025Sequoia Financial AdvisorsBuy5808,873$763,447
Q4 2024Sequoia Financial AdvisorsBuy6478,293$871,690
Q3 2024Sequoia Financial AdvisorsSell-2897,646$908,783
Q2 2024Sequoia Financial AdvisorsBuy8627,935$711,290
Q1 2024Sequoia Financial AdvisorsSell-3,1687,073$567,447
Q4 2023Sequoia Financial AdvisorsBuy10,24110,241$716,799
Q4 2022Renaissance Technologies LLCSell-53,90080,600$4,018
Q3 2022Renaissance Technologies LLCSell-143,200134,500$5,914
Q2 2022Renaissance Technologies LLCBuy161,400277,700$13,521
Q1 2022Renaissance Technologies LLCSell-241,263116,300$6,444
Q4 2021Renaissance Technologies LLCBuy184,200357,563$18,711
Q3 2021Renaissance Technologies LLCSell-199,200173,363$7,533
Q2 2021Renaissance Technologies LLCBuy258,100372,563$15,767
Q1 2021Renaissance Technologies LLCBuy26,163114,463$4,236
Q1 2020Parnassus Endeavor FundBuy43,2535,981,108$142,350
Q1 2020Renaissance Technologies LLCSell-1,50088,300$2,102
Q4 2019Parnassus Endeavor FundSell-1,270,9595,937,855$189,240
Q3 2019Parnassus Endeavor FundBuy78,9257,208,814$233,493
Q2 2019Parnassus Endeavor FundSell-2,403,9637,129,889$223,165
Q1 2019Renaissance Technologies LLCSell-36,90089,800$3,184
Q1 2019Parnassus Endeavor FundSell-5,1309,533,852$338,071
Q4 2018Parnassus Endeavor FundSell-3,806,4569,538,982$309,158
Q4 2018Renaissance Technologies LLCSell-55,800126,700$4,106
Q3 2018Renaissance Technologies LLCBuy128,438182,500$6,300

Frequently asked questions about IRM activity

  • Which institutional owners are buying IRM?

    Institutional owners buying IRM include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in IRM activity?

    "Buy" means an investor increased their reported position in IRM compared to the prior reporting period. This reflects growing exposure to IRON MOUNTAIN INC (IRM) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in IRM increasing?

    Institutional interest in IRM can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.

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