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Horizon Kinetics Asset Management’s Iron Mountain IRM Stock Holding History

Horizon Kinetics Asset 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
Q2 		$2.25M Sell
17,845
-560
-3% -$68.7K 0.03% 113
2026
Q1 		$1.88M Hold
18,405
– – 0.02% 124
2025
Q4 		$1.53M Sell
18,405
-1,050
-5% -$98.3K 0.02% 131
2025
Q3 		$1.98M Sell
19,455
-13,000
-40% -$1.25M 0.02% 118
2025
Q2 		$3.33M Hold
32,455
– – 0.04% 90
2025
Q1 		$2.79M Sell
32,455
-445
-1% -$42.9K 0.03% 102
2024
Q4 		$3.46M Sell
32,900
-1,550
-4% -$182K 0.04% 88
2024
Q3 		$4.09M Buy
34,450
+10,350
+43% +$1.11M 0.06% 80
2024
Q2 		$2.16M Sell
24,100
-400
-2% -$32.4K 0.04% 99
2024
Q1 		$1.97M Sell
24,500
-1,950
-7% -$141K 0.04% 104
2023
Q4 		$1.85M Sell
26,450
-908
-3% -$57K 0.04% 103
2023
Q3 		$1.63M Hold
27,358
– – 0.03% 114
2023
Q2 		$1.55M Hold
27,358
– – 0.03% 122
2023
Q1 		$1.45M Sell
27,358
-150
-0.5% -$7.86K 0.03% 125
2022
Q4 		$1.37M Hold
27,508
– – 0.02% 125
2022
Q3 		$1.21M Sell
27,508
-50
-0.2% -$2.52K 0.02% 129
2022
Q2 		$1.34M Sell
27,558
-100
-0.4% -$5.26K 0.03% 134
2022
Q1 		$1.53M Buy
27,658
+2,450
+10% +$117K 0.03% 142
2021
Q4 		$1.32M Buy
25,208
+350
+1% +$16.5K 0.03% 160
2021
Q3 		$1.08M Sell
24,858
-1,800
-7% -$81K 0.03% 173
2021
Q2 		$1.13M Hold
26,658
– – 0.02% 171
2021
Q1 		$987K Buy
26,658
+1,850
+7% +$61.9K 0.02% 180
2020
Q4 		$731K Buy
24,808
+4,320
+21% +$120K 0.02% 202
2020
Q3 		$549K Buy
20,488
+4,130
+25% +$118K 0.02% 233
2020
Q2 		$427K Sell
16,358
-2,400
-13% -$60.6K 0.02% 254
2020
Q1 		$446K Buy
18,758
+9,700
+107% +$294K 0.02% 227
2019
Q4 		$289K Buy
+9,058
New +$297K 0.01% 352

Other funds holding IRM

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Cohen & Steers
Cohen & Steers New York $63.2B AUM 17.15% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
Principal Financial Group
Principal Financial Group Des Moines, Iowa $204B AUM 27.99% 1-Year Est. Return

Horizon Kinetics Asset Management's IRM Position: Q2 2026 in Review

Horizon Kinetics Asset Management reduced its Iron Mountain (IRM) stake by 3% in Q2 2026, selling an estimated $68.7K and leaving 17,845 shares worth $2.25M. The position accounts for 0.03% of the portfolio, ranked #113.

Horizon Kinetics Asset Management first reported a position in IRM in Q4 2019 and has held it in 27 quarters since. The position peaked at $4.09M in Q3 2024. 1,165 funds tracked by Wall St. Rank hold IRM as of Q2 2026.

  • Horizon Kinetics Asset Management held 17,845 shares of Iron Mountain worth $2.25M as of Q2 2026.
  • Horizon Kinetics Asset Management sold 560 Iron Mountain shares in Q2 2026, an estimated $68.7K.
  • Iron Mountain made up 0.03% of Horizon Kinetics Asset Management's portfolio in Q2 2026, its #113 holding.
  • Horizon Kinetics Asset Management first reported a position in Iron Mountain in Q4 2019 and has held it in 27 quarters since.
  • Horizon Kinetics Asset Management's Iron Mountain position peaked at $4.09M in Q3 2024.
  • 1,165 funds tracked by Wall St. Rank held Iron Mountain as of Q2 2026.

Based on Horizon Kinetics Asset Management's 13F filing for Q2 2026, filed 11 Aug 2026.