Twin Tree Management’s Iron Mountain IRM Stock Holding History

Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake
Trade Value Portfolio Weight Portfolio Position
2026
Q1
Sell
-8,500
Closed -$705K 1487
2025
Q4
$705K Buy
+8,500
New +$796K 0.01% 1071
2024
Q3
Sell
-6,800
Closed -$609K 1645
2024
Q2
$609K Sell
6,800
-13,900
-67% -$1.12M ﹤0.01% 1109
2024
Q1
$1.66M Sell
20,700
-110,400
-84% -$7.99M ﹤0.01% 1009
2023
Q4
$9.17M Sell
131,100
-262,100
-67% -$16.4M 0.02% 711
2023
Q3
$23.4M Sell
393,200
-129,700
-25% -$7.93M 0.05% 314
2023
Q2
$29.7M Sell
522,900
-236,200
-31% -$12.9M 0.05% 313
2023
Q1
$40.2M Sell
759,100
-107,500
-12% -$5.63M 0.07% 226
2022
Q4
$43.2M Sell
866,600
-489,100
-36% -$24.7M 0.09% 200
2022
Q3
$59.6M Buy
1,355,700
+640,500
+90% +$32.3M 0.11% 147
2022
Q2
$34.8M Buy
715,200
+235,500
+49% +$12.4M 0.06% 257
2022
Q1
$26.6M Buy
+479,700
New +$22.8M 0.04% 380
2021
Q4
Sell
-8,400
Closed -$365K 1703
2021
Q3
$365K Sell
8,400
-60,100
-88% -$2.71M ﹤0.01% 1332
2021
Q2
$2.9M Sell
68,500
-515,800
-88% -$21.6M 0.01% 809
2021
Q1
$21.6M Buy
584,300
+526,100
+904% +$17.6M 0.08% 268
2020
Q4
$1.72M Buy
58,200
+37,000
+175% +$1.03M 0.01% 886
2020
Q3
$568K Sell
21,200
-34,000
-62% -$967K ﹤0.01% 959
2020
Q2
$1.44M Sell
55,200
-300
-0.5% -$7.58K 0.01% 967
2020
Q1
$1.32M Sell
55,500
-104,400
-65% -$3.16M 0.01% 803
2019
Q4
$5.1M Sell
159,900
-126,100
-44% -$4.13M 0.02% 507
2019
Q3
$9.26M Buy
286,000
+257,500
+904% +$8.09M 0.04% 347
2019
Q2
$892K Buy
+28,500
New +$934K ﹤0.01% 828
2018
Q4
Sell
-14,200
Closed -$490K 1420
2018
Q3
$490K Sell
14,200
-6,300
-31% -$224K ﹤0.01% 843
2018
Q2
$718K Buy
+20,500
New +$692K ﹤0.01% 842
2018
Q1
Sell
-6,600
Closed -$249K 1199
2017
Q4
$249K Hold
6,600
﹤0.01% 873
2017
Q3
$257K Buy
+6,600
New +$247K ﹤0.01% 811

Other funds holding IRM

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.