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 Form 13F filings. 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
Q3 2018Parnassus Endeavor FundBuy16,77613,345,438$460,685
Q2 2018Parnassus Endeavor FundBuy9,94413,328,662$466,636
Q1 2018Parnassus Endeavor FundBuy751,09113,318,718$437,653
Q4 2017Renaissance Technologies LLCSell-283,70154,062$2,040
Q4 2017Parnassus Endeavor FundBuy70,00012,567,627$474,177
Q3 2017Parnassus Endeavor FundBuy122,98012,497,627$486,158
Q2 2017Parnassus Endeavor FundBuy431,81012,374,647$425,193
Q1 2017Parnassus Endeavor FundBuy441,45811,942,837$414,108
Q4 2016Parnassus Endeavor FundBuy871,41111,501,379$373,565
Q3 2016Parnassus Endeavor FundSell-1,042,93910,629,968$398,943
Q2 2016Parnassus Endeavor FundSell-351,17411,672,907$464,932
Q1 2016Parnassus Endeavor FundBuy135,68612,024,081$407,737
Q4 2015Renaissance Technologies LLCBuy337,763337,763$9,123
Q4 2015Parnassus Endeavor FundBuy12,04711,888,395$321,106
Q3 2015Parnassus Endeavor FundBuy577,22411,876,348$353,791
Q2 2015Parnassus Endeavor FundBuy495,75811,299,124$350,273
Q1 2015Parnassus Endeavor FundBuy246,58810,803,366$394,107
Q4 2014Parnassus Endeavor FundBuy10,556,77810,556,778$408,125

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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