Two Sigma Investments
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Two Sigma Investments’s Iron Mountain IRM Stock Holding History

Two Sigma Investments’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 		$18.3M Sell
179,202
-110,958
-38% -$11M 0.01% 1001
2025
Q4 		$24.1M Buy
+290,160
New +$27.2M 0.03% 632
2025
Q2 		– Sell
-175,533
Closed -$15.1M – 3349
2025
Q1 		$15.1M Buy
+175,533
New +$16.9M 0.03% 595
2024
Q2 		– Sell
-45,856
Closed -$3.68M – 3175
2024
Q1 		$3.68M Buy
+45,856
New +$3.32M 0.01% 1132
2023
Q2 		– Sell
-5,824
Closed -$308K – 3133
2023
Q1 		$308K Sell
5,824
-29,832
-84% -$1.56M ﹤0.01% 2403
2022
Q4 		$1.78M Buy
35,656
+21,000
+143% +$1.06M 0.01% 1377
2022
Q3 		$644K Buy
+14,656
New +$740K ﹤0.01% 1656
2020
Q2 		– Sell
-166,802
Closed -$4.21M – 3220
2020
Q1 		$3.97M Buy
+166,802
New +$5.05M 0.03% 613
2019
Q4 		– Sell
-823,332
Closed -$27M – 3807
2019
Q3 		$26.7M Buy
823,332
+561,841
+215% +$17.6M 0.09% 282
2019
Q2 		$8.19M Sell
261,491
-842,133
-76% -$27.6M 0.03% 677
2019
Q1 		$39.1M Buy
1,103,624
+1,077,997
+4,206% +$38.1M 0.13% 206
2018
Q4 		$831K Buy
+25,627
New +$841K ﹤0.01% 1768
2017
Q1 		– Sell
-111,546
Closed -$3.62M – 3090
2016
Q4 		$3.62M Buy
111,546
+51,500
+86% +$1.71M 0.01% 1048
2016
Q3 		$2.25M Sell
60,046
-1,078,227
-95% -$41.6M 0.01% 1370
2016
Q2 		$45.3M Buy
1,138,273
+1,020,914
+870% +$37.2M 0.19% 120
2016
Q1 		$3.98M Sell
117,359
-478,491
-80% -$13.7M 0.02% 814
2015
Q4 		$16.1M Buy
+595,850
New +$17.5M 0.08% 289
2015
Q1 		– Sell
-39,241
Closed -$1.52M – 2719
2014
Q4 		$1.52M Buy
+39,241
New +$1.43M 0.01% 1164
2014
Q2 		– Sell
-225,305
Closed -$5.74M – 2242
2014
Q1 		$5.74M Buy
225,305
+142,254
+171% +$3.64M 0.03% 584
2013
Q4 		$2.33M Sell
83,051
-38,885
-32% -$996K 0.01% 935
2013
Q3 		$3.04M Sell
121,936
-572,143
-82% -$14.5M 0.02% 657
2013
Q2 		$17.1M Buy
+694,079
New +$22.4M 0.12% 238

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

Two Sigma Investments's IRM Position: Q1 2026 in Review

Two Sigma Investments reduced its Iron Mountain (IRM) stake by 38% in Q1 2026, selling an estimated $11M and leaving 179,202 shares worth $18.3M. The position accounts for 0.01% of the portfolio, ranked #1001.

Two Sigma Investments first reported a position in IRM in Q2 2013 and has held it in 22 quarters since. The position peaked at $45.3M in Q2 2016. 1,082 funds tracked by Wall St. Rank hold IRM as of Q1 2026.

  • Two Sigma Investments held 179,202 shares of Iron Mountain worth $18.3M as of Q1 2026.
  • Two Sigma Investments sold 110,958 Iron Mountain shares in Q1 2026, an estimated $11M.
  • Iron Mountain made up 0.01% of Two Sigma Investments's portfolio in Q1 2026, its #1001 holding.
  • Two Sigma Investments first reported a position in Iron Mountain in Q2 2013 and has held it in 22 quarters since.
  • Two Sigma Investments's Iron Mountain position peaked at $45.3M in Q2 2016.
  • 1,082 funds tracked by Wall St. Rank held Iron Mountain as of Q1 2026.

Based on Two Sigma Investments's 13F filing for Q1 2026, filed 15 May 2026.