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Polar Asset Management Partners’s Iron Mountain IRM Stock Holding History

Polar Asset Management Partners’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
-86,400
Closed -$7.17M – 764
2025
Q4 		$7.17M Buy
86,400
+65,481
+313% +$6.13M 0.09% 195
2025
Q3 		$2.13M Sell
20,919
-38,727
-65% -$3.73M 0.02% 374
2025
Q2 		$6.12M Buy
59,646
+3,600
+6% +$339K 0.1% 168
2025
Q1 		$4.82M Sell
56,046
-85,454
-60% -$8.23M 0.11% 192
2024
Q4 		$14.9M Buy
141,500
+98,300
+228% +$11.5M 0.17% 118
2024
Q3 		$5.13M Sell
43,200
-42,300
-49% -$4.52M 0.11% 189
2024
Q2 		$7.66M Sell
85,500
-179,100
-68% -$14.5M 0.16% 135
2024
Q1 		$21.2M Buy
264,600
+124,000
+88% +$8.98M 0.36% 38
2023
Q4 		$9.84M Buy
+140,600
New +$8.82M 0.17% 115
2022
Q1 		– Sell
-23,038
Closed -$1.21M – 1364
2021
Q4 		$1.21M Buy
+23,038
New +$1.09M 0.01% 684
2021
Q3 		– Sell
-20,083
Closed -$850K – 1308
2021
Q2 		$850K Buy
+20,083
New +$842K 0.01% 670

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

Polar Asset Management Partners's IRM Position: Q1 2026 in Review

Polar Asset Management Partners sold out of Iron Mountain (IRM) in Q1 2026, closing a stake of 86,400 shares — an estimated $7.17M sold.

Polar Asset Management Partners first reported a position in IRM in Q2 2021 and held it in 11 quarters. The position peaked at $21.2M in Q1 2024. 1,082 funds tracked by Wall St. Rank hold IRM as of Q1 2026.

  • Polar Asset Management Partners reported no remaining Iron Mountain position as of Q1 2026 after selling out during the quarter.
  • Polar Asset Management Partners sold 86,400 Iron Mountain shares in Q1 2026, an estimated $7.17M.
  • Polar Asset Management Partners first reported a position in Iron Mountain in Q2 2021 and held it in 11 quarters.
  • Polar Asset Management Partners's Iron Mountain position peaked at $21.2M in Q1 2024.
  • 1,082 funds tracked by Wall St. Rank held Iron Mountain as of Q1 2026.

Based on Polar Asset Management Partners's 13F filing for Q1 2026, filed 15 May 2026.