Acadian Asset Management
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Acadian Asset Management’s Iron Mountain IRM Stock Holding History

Acadian Asset Management’s Portfolio IRM Stock Details IRM Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$17.2M Buy
168,907
+165,979
+5,669% +$16.5M 0.02% 406
2025
Q4 		$242K Sell
2,928
-59,488
-95% -$5.57M ﹤0.01% 1483
2025
Q3 		$6.36M Buy
62,416
+60,407
+3,007% +$5.82M 0.01% 576
2025
Q2 		$206K Buy
+2,009
New +$189K ﹤0.01% 1302
2025
Q1 		– Sell
-22,027
Closed -$2.31M – 1714
2024
Q4 		$2.31M Sell
22,027
-538,613
-96% -$63.3M 0.01% 729
2024
Q3 		$66.6M Buy
560,640
+476,415
+566% +$51M 0.21% 126
2024
Q2 		$7.54M Sell
84,225
-23,010
-21% -$1.86M 0.02% 405
2024
Q1 		$8.6M Sell
107,235
-23,763
-18% -$1.72M 0.03% 340
2023
Q4 		$9.16M Buy
130,998
+70,968
+118% +$4.45M 0.04% 305
2023
Q3 		$3.57M Buy
60,030
+7,445
+14% +$455K 0.01% 535
2023
Q2 		$2.98M Buy
52,585
+43,618
+486% +$2.39M 0.01% 591
2023
Q1 		$474K Hold
8,967
– – ﹤0.01% 1063
2022
Q4 		$447K Sell
8,967
-31,861
-78% -$1.61M ﹤0.01% 1065
2022
Q3 		$1.79M Buy
40,828
+36,514
+846% +$1.84M 0.01% 671
2022
Q2 		$210K Buy
4,314
+1,811
+72% +$95.3K ﹤0.01% 1188
2022
Q1 		$137K Buy
2,503
+328
+15% +$15.6K ﹤0.01% 1297
2021
Q4 		$113K Sell
2,175
-61,636
-97% -$2.91M ﹤0.01% 1349
2021
Q3 		$2.77M Buy
63,811
+30,641
+92% +$1.38M 0.01% 599
2021
Q2 		$1.4M Buy
33,170
+32,486
+4,749% +$1.36M 0.01% 815
2021
Q1 		$25K Sell
684
-20,519
-97% -$686K ﹤0.01% 1960
2020
Q4 		$625K Buy
21,203
+4,001
+23% +$111K ﹤0.01% 1159
2020
Q3 		$460K Buy
17,202
+3,702
+27% +$105K ﹤0.01% 1156
2020
Q2 		$352K Buy
+13,500
New +$341K ﹤0.01% 1315
2015
Q3 		– Sell
-6,539
Closed -$203K – 1363
2015
Q2 		$203K Buy
+6,539
New +$229K ﹤0.01% 938
2015
Q1 		– Sell
-2,753
Closed -$107K – 1405
2014
Q4 		$107K Buy
+2,753
New +$100K ﹤0.01% 986

Other funds holding IRM

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Cohen & Steers
Cohen & Steers New York $57.6B AUM 8.03% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
Principal Financial Group
Principal Financial Group Des Moines, Iowa $187B AUM 18.48% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

Acadian Asset Management's IRM Position: Q1 2026 in Review

Acadian Asset Management increased its Iron Mountain (IRM) stake by 5,669% in Q1 2026, buying an estimated $16.5M and bringing the position to 168,907 shares worth $17.2M. The position accounts for 0.02% of the portfolio, ranked #406.

Acadian Asset Management first reported a position in IRM in Q4 2014 and has held it in 25 quarters since. The position peaked at $66.6M in Q3 2024. 1,082 funds tracked by Wall St. Rank hold IRM as of Q1 2026.

  • Acadian Asset Management held 168,907 shares of Iron Mountain worth $17.2M as of Q1 2026.
  • Acadian Asset Management bought 165,979 Iron Mountain shares in Q1 2026, an estimated $16.5M.
  • Iron Mountain made up 0.02% of Acadian Asset Management's portfolio in Q1 2026, its #406 holding.
  • Acadian Asset Management first reported a position in Iron Mountain in Q4 2014 and has held it in 25 quarters since.
  • Acadian Asset Management's Iron Mountain position peaked at $66.6M in Q3 2024.
  • 1,082 funds tracked by Wall St. Rank held Iron Mountain as of Q1 2026.

Based on Acadian Asset Management's 13F filing for Q1 2026, filed 13 May 2026.