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
2026
Q1 		– Sell
-104,700
Closed -$8.68M – 1488
2025
Q4 		$8.68M Hold
104,700
– – 0.08% 333
2025
Q3 		$10.7M Buy
104,700
+24,400
+30% +$2.35M 0.04% 476
2025
Q2 		$8.24M Buy
+80,300
New +$7.57M 0.02% 840
2023
Q4 		– Sell
-96,500
Closed -$5.74M – 1476
2023
Q3 		$5.74M Sell
96,500
-307,300
-76% -$18.8M 0.01% 649
2023
Q2 		$22.9M Buy
403,800
+160,000
+66% +$8.76M 0.04% 380
2023
Q1 		$12.9M Sell
243,800
-93,300
-28% -$4.89M 0.02% 506
2022
Q4 		$16.8M Buy
337,100
+259,000
+332% +$13.1M 0.04% 435
2022
Q3 		$3.43M Sell
78,100
-802,200
-91% -$40.5M 0.01% 837
2022
Q2 		$42.9M Sell
880,300
-131,700
-13% -$6.93M 0.07% 218
2022
Q1 		$56.1M Buy
+1,012,000
New +$48.2M 0.09% 166
2021
Q3 		– Sell
-47,600
Closed -$2.01M – 1676
2021
Q2 		$2.01M Sell
47,600
-8,000
-14% -$336K 0.01% 882
2021
Q1 		$2.06M Buy
+55,600
New +$1.86M 0.01% 844
2015
Q2 		– Sell
-5,400
Closed -$197K – 1396
2015
Q1 		$197K Buy
+5,400
New +$208K 0.01% 960

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.