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TCW Group’s Iron Mountain IRM Stock Holding History

TCW Group’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 		$13.8M Buy
135,359
+3,079
+2% +$306K 0.1% 124
2025
Q4 		$11M Buy
132,280
+51,257
+63% +$4.8M 0.08% 124
2025
Q3 		$8.26M Buy
+81,023
New +$7.81M 0.07% 118
2022
Q3 		– Sell
-343,178
Closed -$16.7M – 304
2022
Q2 		$16.7M Buy
343,178
+108,583
+46% +$5.71M 0.22% 93
2022
Q1 		$13M Sell
234,595
-9,390
-4% -$447K 0.12% 122
2021
Q4 		$12.8M Buy
243,985
+12,621
+5% +$597K 0.11% 133
2021
Q3 		$10.1K Sell
231,364
-64,104
-22% -$2.89M 0.03% 152
2021
Q2 		$12.5M Buy
295,468
+49,085
+20% +$2.06M 0.11% 132
2021
Q1 		$9.12M Buy
246,383
+217,845
+763% +$7.28M 0.09% 152
2020
Q4 		$841K Buy
28,538
+8,152
+40% +$226K 0.01% 297
2020
Q3 		$546K Buy
+20,386
New +$580K 0.01% 294
2017
Q1 		– Sell
-18,050
Closed -$586K – 502
2016
Q4 		$586K Sell
18,050
-50
-0.3% -$1.66K ﹤0.01% 600
2016
Q3 		$679K Buy
18,100
+550
+3% +$21.2K 0.01% 564
2016
Q2 		$699K Buy
17,550
+4,100
+30% +$149K 0.01% 560
2016
Q1 		$456K Buy
13,450
+150
+1% +$4.31K ﹤0.01% 643
2015
Q4 		$359K Buy
13,300
+150
+1% +$4.4K ﹤0.01% 657
2015
Q3 		$408K Buy
13,150
+302
+2% +$9.01K ﹤0.01% 660
2015
Q2 		$398K Sell
12,848
-39,889
-76% -$1.4M ﹤0.01% 638
2015
Q1 		$1.92M Buy
52,737
+550
+1% +$21.2K 0.01% 633
2014
Q4 		$2.02M Sell
52,187
-31,945
-38% -$1.16M 0.01% 621
2014
Q3 		$2.75M Sell
84,132
-8,532
-9% -$277K 0.01% 619
2014
Q2 		$3.04M Buy
92,664
+974
+1% +$26.4K 0.01% 608
2014
Q1 		$2.34M Buy
91,690
+649
+0.7% +$16.6K 0.01% 642
2013
Q4 		$2.55M Buy
91,041
+109
+0.1% +$2.79K 0.01% 636
2013
Q3 		$2.27M Buy
90,932
+1,893
+2% +$48.1K 0.01% 641
2013
Q2 		$2.19M Buy
+89,039
New +$2.87M 0.01% 625

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

TCW Group's IRM Position: Q1 2026 in Review

TCW Group increased its Iron Mountain (IRM) stake by 2.3% in Q1 2026, buying an estimated $306K and bringing the position to 135,359 shares worth $13.8M. The position accounts for 0.1% of the portfolio, ranked #124.

TCW Group first reported a position in IRM in Q2 2013 and has held it in 26 quarters since. The position peaked at $16.7M in Q2 2022. 1,082 funds tracked by Wall St. Rank hold IRM as of Q1 2026.

  • TCW Group held 135,359 shares of Iron Mountain worth $13.8M as of Q1 2026.
  • TCW Group bought 3,079 Iron Mountain shares in Q1 2026, an estimated $306K.
  • Iron Mountain made up 0.1% of TCW Group's portfolio in Q1 2026, its #124 holding.
  • TCW Group first reported a position in Iron Mountain in Q2 2013 and has held it in 26 quarters since.
  • TCW Group's Iron Mountain position peaked at $16.7M in Q2 2022.
  • 1,082 funds tracked by Wall St. Rank held Iron Mountain as of Q1 2026.

Based on TCW Group's 13F filing for Q1 2026, filed 14 May 2026.