MAM
IRM icon

Madison Asset Management’s Iron Mountain IRM Stock Holding History

Madison 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
Q1 		$1.74M Hold
17,052
– – 0.02% 263
2025
Q4 		$1.41M Sell
17,052
-908
-5% -$85K 0.02% 272
2025
Q3 		$1.83M Sell
17,960
-571
-3% -$55K 0.02% 247
2025
Q2 		$1.9M Hold
18,531
– – 0.02% 246
2025
Q1 		$1.59M Sell
18,531
-5,838
-24% -$563K 0.02% 254
2024
Q4 		$2.56M Hold
24,369
– – 0.03% 221
2024
Q3 		$2.9M Sell
24,369
-5,714
-19% -$611K 0.03% 221
2024
Q2 		$2.7M Hold
30,083
– – 0.03% 230
2024
Q1 		$2.41M Hold
30,083
– – 0.03% 237
2023
Q4 		$2.11M Sell
30,083
-319
-1% -$20K 0.03% 254
2023
Q3 		$1.81M Sell
30,402
-71
-0.2% -$4.34K 0.03% 262
2023
Q2 		$1.73M Hold
30,473
– – 0.03% 257
2023
Q1 		$1.61M Sell
30,473
-4,398
-13% -$230K 0.02% 250
2022
Q4 		$1.74M Sell
34,871
-728
-2% -$36.8K 0.03% 255
2022
Q3 		$1.56M Sell
35,599
-139
-0.4% -$7.02K 0.03% 263
2022
Q2 		$1.74M Sell
35,738
-440
-1% -$23.2K 0.03% 276
2022
Q1 		$2M Buy
36,178
+18
+0% +$857 0.03% 242
2021
Q4 		$1.89M Buy
36,160
+2,538
+8% +$120K 0.02% 254
2021
Q3 		$1.46M Buy
33,622
+1,400
+4% +$63K 0.02% 256
2021
Q2 		$1.36M Buy
32,222
+1,226
+4% +$51.4K 0.02% 263
2021
Q1 		$1.15M Buy
30,996
+913
+3% +$30.5K 0.02% 260
2020
Q4 		$887K Hold
30,083
– – 0.01% 256
2020
Q3 		$806K Hold
30,083
– – 0.01% 230
2020
Q2 		$785K Buy
30,083
+9,000
+43% +$227K 0.01% 231
2020
Q1 		$502K Buy
21,083
+7,600
+56% +$230K 0.01% 233
2019
Q4 		$430K Buy
+13,483
New +$442K 0.01% 267

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

Madison Asset Management's IRM Position: Q1 2026 in Review

Madison Asset Management held its Iron Mountain (IRM) position steady in Q1 2026 at 17,052 shares worth $1.74M. The position accounts for 0.02% of the portfolio, ranked #263.

Madison Asset Management first reported a position in IRM in Q4 2019 and has held it in 26 quarters since. The position peaked at $2.9M in Q3 2024. 1,082 funds tracked by Wall St. Rank hold IRM as of Q1 2026.

  • Madison Asset Management held 17,052 shares of Iron Mountain worth $1.74M as of Q1 2026.
  • Madison Asset Management left its Iron Mountain share count unchanged in Q1 2026.
  • Iron Mountain made up 0.02% of Madison Asset Management's portfolio in Q1 2026, its #263 holding.
  • Madison Asset Management first reported a position in Iron Mountain in Q4 2019 and has held it in 26 quarters since.
  • Madison Asset Management's Iron Mountain position peaked at $2.9M in Q3 2024.
  • 1,082 funds tracked by Wall St. Rank held Iron Mountain as of Q1 2026.

Based on Madison Asset Management's 13F filing for Q1 2026, filed 7 May 2026.