Ticker · CUSIP 46284V101

IRM

REIT

IRON MTN INC NEW

Real Estate·REIT - Specialty

···Share

Holders (tracked)

Combined shares

9,609,026

Combined value

$797.07M

Last close

$118.07

Quarter

2025Q4

Price is +42.3% vs the avg quarter-end implied price across tracked holders.

Price · 1Y$118.07+36.71 (+45.12%)H $118.07 · L $78.22 · Avg Vol 1.7M

Tracked holders · last 8 quarters

+8 vs previous quarter over the last 8.

SEC event timeline

24 events

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

Follow-the-investor returns

If you'd copied each holder of IRM…

Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.

Investor	First in	Cost basis	Return	Position value today
Norges Bank (Norway SWF)	2016Q1	$62.00	+90.4%	$525.1M
T. Rowe Price	2016Q1	$66.29	+78.1%	$71.7M
Ken Fisher (Fisher Asset Mgmt)	2023Q4	$81.30	+45.2%	$498K
George Soros (Soros Fund Mgmt)	2017Q1	$82.13	+43.8%	$38.7M
Wellington Management	2018Q3	$82.81	+42.6%	$12.3M
Steve Cohen (Point72)	2023Q1	$83.03	+42.2%	$460K
Steve Cohen (Point72)	2023Q1	$83.03	+42.2%	$460K
Steve Cohen (Point72)	2023Q1	$83.03	+42.2%	$460K
Two Sigma Investments	2016Q1	$83.27	+41.8%	$34.3M
Izzy Englander (Millennium Mgmt)	2016Q1	$83.75	+41.0%	$1.4M
Izzy Englander (Millennium Mgmt)	2016Q1	$83.75	+41.0%	$1.4M
Izzy Englander (Millennium Mgmt)	2016Q1	$83.75	+41.0%	$1.4M
Ken Griffin (Citadel Advisors)	2016Q1	$84.06	+40.5%	$21.0M
Ken Griffin (Citadel Advisors)	2016Q1	$84.06	+40.5%	$21.0M
Ken Griffin (Citadel Advisors)	2016Q1	$84.06	+40.5%	$21.0M
D.E. Shaw & Co.	2016Q1	$86.24	+36.9%	$4.0M
D.E. Shaw & Co.	2016Q1	$86.24	+36.9%	$4.0M
D.E. Shaw & Co.	2016Q1	$86.24	+36.9%	$4.0M
Paul Tudor Jones (Tudor Investment)	2017Q4	$87.70	+34.6%	$2.5M
Paul Tudor Jones (Tudor Investment)	2017Q4	$87.70	+34.6%	$2.5M
Paul Tudor Jones (Tudor Investment)	2017Q4	$87.70	+34.6%	$2.5M
AQR Capital Management	2016Q1	$92.05	+28.3%	$109.0M

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.

New positions4

Norges Bank (Norway SWF)
+4,447,133
$368.9M
George Soros (Soros Fund Mgmt)
+327,700
$27.2M
Two Sigma Investments
+290,160
$24.1M
Paul Tudor Jones (Tudor Investment)
+22,190
$1.8M

Added to4

Ken Griffin (Citadel Advisors)
+1,058,080
$87.8M
AQR Capital Management
+465,724
$38.6M
Izzy Englander (Millennium Mgmt)
+3,597
$298K
T. Rowe Price
+11,264
$934

Trimmed4

Steve Cohen (Point72)
−506,027
$42.0M
Wellington Management
−144,765
$12.0M
D.E. Shaw & Co.
−138,283
$11.5M
Ken Fisher (Fisher Asset Mgmt)
−381
$32K

Exited1

Ron Baron (Baron Capital / BAMCO)
−436,831
$44.5M

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.

Quarter	Holders	Shares	Combined value	Δ holders
2022Q1	15	27,819,013	$159.67B	—
2022Q2	16	27,949,689	$119.53B	+1
2022Q3	17	27,100,951	$1.19B	+1
2022Q4	17	27,546,848	$1.37B	—
2023Q1	14	27,102,303	$1.43B	-3
2023Q2	17	28,000,890	$1.59B	+3
2023Q3	14	28,268,146	$1.68B	-3
2023Q4	13	30,176,624	$2.11B	-1
2024Q1	15	33,229,754	$2.67B	+2
2024Q2	14	35,853,861	$3.21B	-1
2024Q3	17	8,536,392	$1.01B	+3
2024Q4	18	7,188,400	$755.4M	+1
2025Q1	19	8,244,708	$709.3M	+1
2025Q2	19	9,450,984	$969.3M	—
2025Q3	14	4,080,865	$415.7M	-5
2025Q4	22	9,609,026	$797.1M	+8

Who owns IRM

22 super-investors · 2025Q4

Tracked stake

9.61M

Combined value

$797M

% of shares outstanding

—

shares-out unknown

Quarter action mix

New6Added8Trim8

#	Manager	Shares	Value	% of book	Last action
1	Norges Bank Norway SWF	4.45M	$369M	0.0%	New+4.45M
2	Ken Griffin Citadel Advisors	1.12M	$93M	0.0%	Added+1.06M
3	AQR Capital Management	923.2K	$77M	0.0%	Added+465.7K
4	Steve Cohen Point72	790.5K	$66M	0.1%	Trim−506.0K
5	T. Rowe Price	606.9K	$50M	0.0%	Added+11.3K
6	Izzy Englander Millennium Mgmt	489.0K	$41M	0.0%	Added+3.6K
7	George Soros Soros Fund Mgmt	327.7K	$27M	0.3%	New+327.7K
8	Two Sigma Investments	290.2K	$24M	0.0%	New+290.2K
9	Ken Griffin Citadel Advisors	177.9K	$15M	0.0%	Added+1.06M
10	Wellington Management	104.1K	$9M	0.0%	Trim−144.8K
11	Ken Griffin Citadel Advisors	90.5K	$8M	0.0%	Added+1.06M
12	Izzy Englander Millennium Mgmt	74.6K	$6M	0.0%	Added+3.6K
13	Paul Tudor Jones Tudor Investment	40.4K	$3M	0.0%	New+22.2K
14	D.E. Shaw & Co.	34.1K	$3M	0.0%	Trim−138.3K
15	Paul Tudor Jones Tudor Investment	22.2K	$2M	0.0%	New+22.2K
16	Paul Tudor Jones Tudor Investment	21.2K	$2M	0.0%	New+22.2K
17	D.E. Shaw & Co.	19.3K	$2M	0.0%	Trim−138.3K
18	Izzy Englander Millennium Mgmt	11.8K	$979K	0.0%	Added+3.6K
19	D.E. Shaw & Co.	5.8K	$477K	0.0%	Trim−138.3K
20	Steve Cohen Point72	5.1K	$423K	0.0%	Trim−506.0K
21	Ken Fisher Fisher Asset Mgmt	4.2K	$350K	0.0%	Trim−381
22	Steve Cohen Point72	3.9K	$324K	0.0%	Trim−506.0K

Recent moves

20 transactions

SOLDRon Baron (Baron Capital / BAMCO)
−436,831 · 2025Q4
ADDAQR Capital Management
+465,724 · 2025Q4
TRIMWellington Management
−144,765 · 2025Q4
ADDT. Rowe Price
+11,264 · 2025Q4
NEWTwo Sigma Investments
+290,160 · 2025Q4
TRIMSteve Cohen (Point72)
−506,027 · 2025Q4
ADDKen Griffin (Citadel Advisors)
+1,058,080 · 2025Q4
TRIMD.E. Shaw & Co.
−138,283 · 2025Q4
ADDIzzy Englander (Millennium Mgmt)
+3,597 · 2025Q4
NEWPaul Tudor Jones (Tudor Investment)
+22,190 · 2025Q4
NEWGeorge Soros (Soros Fund Mgmt)
+327,700 · 2025Q4
NEWNorges Bank (Norway SWF)
+4,447,133 · 2025Q4
TRIMKen Fisher (Fisher Asset Mgmt)
−381 · 2025Q4
SOLDPaul Tudor Jones (Tudor Investment)
−29,141 · 2025Q3
ADDSteve Cohen (Point72)
+282,152 · 2025Q3
TRIMIzzy Englander (Millennium Mgmt)
−90,552 · 2025Q3
TRIMD.E. Shaw & Co.
−439,938 · 2025Q3
TRIMT. Rowe Price
−31,445 · 2025Q3
TRIMWellington Management
−1,245,031 · 2025Q3
ADDRon Baron (Baron Capital / BAMCO)
+329,307 · 2025Q3

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