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
Q2 		$36.9M Buy
292,064
+123,157
+73% +$15.1M 0.04% 306
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 $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Cohen & Steers
Cohen & Steers New York $63.2B AUM 17.15% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
Principal Financial Group
Principal Financial Group Des Moines, Iowa $204B AUM 27.99% 1-Year Est. Return

Acadian Asset Management's IRM Position: Q2 2026 in Review

Acadian Asset Management increased its Iron Mountain (IRM) stake by 73% in Q2 2026, buying an estimated $15.1M and bringing the position to 292,064 shares worth $36.9M. The position accounts for 0.04% of the portfolio, ranked #306.

Acadian Asset Management first reported a position in IRM in Q4 2014 and has held it in 26 quarters since. The position peaked at $66.6M in Q3 2024. 1,170 funds tracked by Wall St. Rank hold IRM as of Q2 2026.

  • Acadian Asset Management held 292,064 shares of Iron Mountain worth $36.9M as of Q2 2026.
  • Acadian Asset Management bought 123,157 Iron Mountain shares in Q2 2026, an estimated $15.1M.
  • Iron Mountain made up 0.04% of Acadian Asset Management's portfolio in Q2 2026, its #306 holding.
  • Acadian Asset Management first reported a position in Iron Mountain in Q4 2014 and has held it in 26 quarters since.
  • Acadian Asset Management's Iron Mountain position peaked at $66.6M in Q3 2024.
  • 1,170 funds tracked by Wall St. Rank held Iron Mountain as of Q2 2026.

Based on Acadian Asset Management's 13F filing for Q2 2026, filed 13 Aug 2026.