IRON MOUNTAIN INC (IRM) Stock Institutional Trading Activity
IRON MOUNTAIN INC (IRM) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q3 2025), investors with some of the largest reported share count changes include Sequoia Financial Advisors, Renaissance Technologies LLC, and Parnassus Endeavor Fund. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.
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- IRON MOUNTAIN INC (IRM) stock institutional ownership
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| Portfolio quarter | Name | Type | Quantity | Remaining | Reported stock balance |
|---|---|---|---|---|---|
| Q4 2017 | Parnassus Endeavor Fund | Buy | 70,000 | 12,567,627 | $474,177 |
| Q4 2017 | Renaissance Technologies LLC | Sell | -283,701 | 54,062 | $2,040 |
| Q3 2017 | Parnassus Endeavor Fund | Buy | 122,980 | 12,497,627 | $486,158 |
| Q2 2017 | Parnassus Endeavor Fund | Buy | 431,810 | 12,374,647 | $425,193 |
| Q1 2017 | Parnassus Endeavor Fund | Buy | 441,458 | 11,942,837 | $414,108 |
| Q4 2016 | Parnassus Endeavor Fund | Buy | 871,411 | 11,501,379 | $373,565 |
| Q3 2016 | Parnassus Endeavor Fund | Sell | -1,042,939 | 10,629,968 | $398,943 |
| Q2 2016 | Parnassus Endeavor Fund | Sell | -351,174 | 11,672,907 | $464,932 |
| Q1 2016 | Parnassus Endeavor Fund | Buy | 135,686 | 12,024,081 | $407,737 |
| Q4 2015 | Parnassus Endeavor Fund | Buy | 12,047 | 11,888,395 | $321,106 |
| Q4 2015 | Renaissance Technologies LLC | Buy | 337,763 | 337,763 | $9,123 |
| Q3 2015 | Parnassus Endeavor Fund | Buy | 577,224 | 11,876,348 | $353,791 |
| Q2 2015 | Parnassus Endeavor Fund | Buy | 495,758 | 11,299,124 | $350,273 |
| Q1 2015 | Parnassus Endeavor Fund | Buy | 246,588 | 10,803,366 | $394,107 |
| Q4 2014 | Parnassus Endeavor Fund | Buy | 10,556,778 | 10,556,778 | $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.