Ticker · CUSIP 46284V101

IRM

REIT
IRON MTN INC NEW
Real Estate·REIT - Specialty
···Share
Holders (tracked)
22
Combined shares
9,609,026
Combined value
$746.78M
Last close
—
Quarter
2025Q4
Tracked holders · last 8 quarters
+8 vs previous quarter over the last 8.
22152024Q12025Q4

SEC event timeline

24 events
  1. Ken Griffin (Citadel Advisors) added2026-02-17
    +1,058,080 shares · 2025Q4
    Position
  2. D.E. Shaw & Co. trimmed2026-02-17
    −138,283 shares · 2025Q4
    Position
  3. Two Sigma Investments opened position2026-02-17
    +290,160 shares · 2025Q4
    Position
  4. Steve Cohen (Point72) trimmed2026-02-17
    −506,027 shares · 2025Q4
    Position
  5. T. Rowe Price added2026-02-17
    +11,264 shares · 2025Q4
    Position
  6. Wellington Management trimmed2026-02-17
    −144,765 shares · 2025Q4
    Position
  7. Izzy Englander (Millennium Mgmt) added2026-02-17
    +3,597 shares · 2025Q4
    Position
  8. Paul Tudor Jones (Tudor Investment) opened position2026-02-17
    +22,190 shares · 2025Q4
    Position
  9. Ron Baron (Baron Capital / BAMCO) exited2026-02-17
    −436,831 shares · 2025Q4
    Position
  10. AQR Capital Management added2026-02-17
    +465,724 shares · 2025Q4
    Position
  11. George Soros (Soros Fund Mgmt) opened position2026-02-13
    +327,700 shares · 2025Q4
    Position
  12. Norges Bank (Norway SWF) opened position2026-02-10
    +4,447,133 shares · 2025Q4
    Position
  13. Ken Fisher (Fisher Asset Mgmt) trimmed2026-02-09
    −381 shares · 2025Q4
    Position
  14. Paul Tudor Jones (Tudor Investment) exited2025-12-09
    −29,141 shares · 2025Q3
    Position
  15. Ron Baron (Baron Capital / BAMCO) added2025-11-14
    +329,307 shares · 2025Q3
    Position
  16. D.E. Shaw & Co. trimmed2025-11-14
    −439,938 shares · 2025Q3
    Position
  17. Steve Cohen (Point72) added2025-11-14
    +282,152 shares · 2025Q3
    Position
  18. Izzy Englander (Millennium Mgmt) trimmed2025-11-14
    −90,552 shares · 2025Q3
    Position
  19. T. Rowe Price trimmed2025-11-14
    −31,445 shares · 2025Q3
    Position
  20. Wellington Management trimmed2025-11-14
    −1,245,031 shares · 2025Q3
    Position
  21. AQR Capital Management added2025-11-14
    +351,463 shares · 2025Q3
    Position
  22. Norges Bank (Norway SWF) exited2025-11-13
    −4,089,466 shares · 2025Q3
    Position
  23. Norges Bank (Norway SWF) added2025-11-12
    +41,378 shares · 2024Q3
    Position
  24. Ken Fisher (Fisher Asset Mgmt) trimmed2025-11-12
    −468 shares · 2025Q3
    Position

Insider activity

No insider transactions in the last 30 days.
View full insider history for IRM →

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.
New positions4
Added to4
Trimmed4
Exited1

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.
QuarterHoldersCombined value
2022Q1
15
$159.67B
2022Q2
16
$119.53B
2022Q3
17
$80.8M
2022Q4
17
$1.34B
2023Q1
14
$1.39B
2023Q2
17
$1.56B
2023Q3
14
$1.65B
2023Q4
13
$2.08B
2024Q1
15
$2.62B
2024Q2
14
$3.16B
2024Q3
17
$916.7M
2024Q4
18
$663.3M
2025Q1
19
$638.5M
2025Q2
19
$905.0M
2025Q3
14
$355.1M
2025Q4
22
$746.8M

Who owns IRM

22 super-investors · 2025Q4
Tracked stake
9.61M
shares
Combined value
$747M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New6Added8Trim8
#ManagerSharesValue
1Norges Bank
Norway SWF
4.45M$369M
2Ken Griffin
Citadel Advisors
1.12M$93M
3AQR Capital Management923.2K$77M
4Steve Cohen
Point72
790.5K$66M
5Izzy Englander
Millennium Mgmt
489.0K$41M
6George Soros
Soros Fund Mgmt
327.7K$27M
7Two Sigma Investments290.2K$24M
8Ken Griffin
Citadel Advisors
177.9K$15M
9Wellington Management104.1K$9M
10Ken Griffin
Citadel Advisors
90.5K$8M
11Izzy Englander
Millennium Mgmt
74.6K$6M
12Paul Tudor Jones
Tudor Investment
40.4K$3M
13D.E. Shaw & Co.34.1K$3M
14Paul Tudor Jones
Tudor Investment
22.2K$2M
15Paul Tudor Jones
Tudor Investment
21.2K$2M
16D.E. Shaw & Co.19.3K$2M
17Izzy Englander
Millennium Mgmt
11.8K$979K
18D.E. Shaw & Co.5.8K$477K
19Steve Cohen
Point72
5.1K$423K
20Ken Fisher
Fisher Asset Mgmt
4.2K$350K
21Steve Cohen
Point72
3.9K$324K
22T. Rowe Price606.9K$50K

Recent moves

20 transactions
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