Twin Tree Management
IRM icon

Twin Tree Management’s Iron Mountain IRM Stock Holding History

Twin Tree 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
2025
Q4 		– Sell
-6,576
Closed -$615K – 1572
2025
Q3 		$670K Buy
+6,576
New +$634K ﹤0.01% 1248
2025
Q1 		– Sell
-19,989
Closed -$2.1M – 1733
2024
Q4 		$2.1M Sell
19,989
-254,449
-93% -$29.9M ﹤0.01% 1136
2024
Q3 		$32.6M Buy
+274,438
New +$29.4M 0.06% 271
2022
Q1 		– Sell
-18,330
Closed -$873K – 1753
2021
Q4 		$959K Buy
+18,330
New +$866K ﹤0.01% 1243
2021
Q1 		– Sell
-111,736
Closed -$3.74M – 1464
2020
Q4 		$3.29M Buy
111,736
+65,859
+144% +$1.83M 0.01% 736
2020
Q3 		$1.23M Sell
45,877
-215,714
-82% -$6.14M 0.01% 857
2020
Q2 		$6.83M Buy
+261,591
New +$6.61M 0.03% 564
2020
Q1 		– Sell
-43,838
Closed -$1.33M – 1490
2019
Q4 		$1.4M Buy
43,838
+30,338
+225% +$995K ﹤0.01% 794
2019
Q3 		$437K Sell
13,500
-70,546
-84% -$2.22M ﹤0.01% 922
2019
Q2 		$2.63M Buy
84,046
+42,946
+104% +$1.41M 0.01% 604
2019
Q1 		$1.46M Buy
41,100
+39,335
+2,229% +$1.39M 0.01% 744
2018
Q4 		$57K Sell
1,765
-14,882
-89% -$488K ﹤0.01% 1122
2018
Q3 		$575K Buy
+16,647
New +$593K ﹤0.01% 827
2016
Q4 		– Sell
-874
Closed -$33K – 1255
2016
Q3 		$33K Buy
+874
New +$33.7K ﹤0.01% 1049
2016
Q2 		– Sell
-47
Closed -$2K – 1298
2016
Q1 		$2K Buy
+47
New +$1.35K ﹤0.01% 1190
2015
Q4 		– Sell
-32
Closed -$1K – 1476
2015
Q3 		$1K Sell
32
-458
-93% -$13.7K ﹤0.01% 1280
2015
Q2 		$15K Sell
490
-3,536
-88% -$124K ﹤0.01% 1264
2015
Q1 		$147K Buy
+4,026
New +$155K ﹤0.01% 996

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

Twin Tree Management's IRM Position: Q4 2025 in Review

Twin Tree Management sold out of Iron Mountain (IRM) in Q4 2025, closing a stake of 6,576 shares — an estimated $615K sold.

Twin Tree Management first reported a position in IRM in Q1 2015 and held it in 18 quarters. The position peaked at $32.6M in Q3 2024. 1,006 funds tracked by Wall St. Rank hold IRM as of Q4 2025.

  • Twin Tree Management reported no remaining Iron Mountain position as of Q4 2025 after selling out during the quarter.
  • Twin Tree Management sold 6,576 Iron Mountain shares in Q4 2025, an estimated $615K.
  • Twin Tree Management first reported a position in Iron Mountain in Q1 2015 and held it in 18 quarters.
  • Twin Tree Management's Iron Mountain position peaked at $32.6M in Q3 2024.
  • 1,006 funds tracked by Wall St. Rank held Iron Mountain as of Q4 2025.

Based on Twin Tree Management's 13F filing for Q4 2025, filed 11 Feb 2026.