Millennium Management
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Millennium Management’s Iron Mountain IRM Stock Holding History

Millennium 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 		$981K Sell
9,600
-2,200
-19% -$219K ﹤0.01% 4410
2025
Q4 		$979K Sell
11,800
-8,900
-43% -$833K ﹤0.01% 4507
2025
Q3 		$2.11M Sell
20,700
-3,700
-15% -$356K ﹤0.01% 4005
2025
Q2 		$2.5M Sell
24,400
-16,500
-40% -$1.56M ﹤0.01% 3678
2025
Q1 		$3.52M Buy
40,900
+36,100
+752% +$3.48M ﹤0.01% 3219
2024
Q4 		$505K Buy
4,800
+800
+20% +$94K ﹤0.01% 4740
2024
Q3 		$475K Sell
4,000
-10,100
-72% -$1.08M ﹤0.01% 4869
2024
Q2 		$1.26M Sell
14,100
-32,100
-69% -$2.6M ﹤0.01% 3925
2024
Q1 		$3.71M Buy
46,200
+42,700
+1,220% +$3.09M ﹤0.01% 3182
2023
Q4 		$245K Sell
3,500
-7,100
-67% -$445K ﹤0.01% 5074
2023
Q3 		$630K Sell
10,600
-91,000
-90% -$5.56M ﹤0.01% 4517
2023
Q2 		$5.77M Sell
101,600
-18,800
-16% -$1.03M ﹤0.01% 2545
2023
Q1 		$6.37M Buy
+120,400
New +$6.31M ﹤0.01% 2382
2022
Q3 		– Sell
-85,900
Closed -$4.18M – 7268
2022
Q2 		$4.18M Sell
85,900
-439,700
-84% -$23.1M ﹤0.01% 2982
2022
Q1 		$29.1M Buy
525,600
+105,900
+25% +$5.04M 0.02% 1038
2021
Q4 		$22M Buy
419,700
+35,500
+9% +$1.68M 0.01% 1345
2021
Q3 		$16.7M Sell
384,200
-291,300
-43% -$13.1M 0.01% 1492
2021
Q2 		$28.6M Buy
675,500
+165,500
+32% +$6.94M 0.02% 926
2021
Q1 		$18.9M Buy
+510,000
New +$17.1M 0.01% 1137
2020
Q3 		– Sell
-50,000
Closed -$1.3M – 4631
2020
Q2 		$1.3M Buy
+50,000
New +$1.26M ﹤0.01% 2830
2014
Q4 		– Sell
-29,900
Closed -$976K – 4091
2014
Q3 		$976K Sell
29,900
-13,272
-31% -$430K ﹤0.01% 2327
2014
Q2 		$1.41M Sell
43,172
-116,964
-73% -$3.17M ﹤0.01% 1993
2014
Q1 		$4.08M Buy
160,136
+74,442
+87% +$1.9M 0.01% 1314
2013
Q4 		$2.4M Buy
+85,694
New +$2.2M 0.01% 1692

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

Millennium Management's IRM Position: Q1 2026 in Review

Millennium Management reduced its Iron Mountain (IRM) stake by 23% in Q1 2026, selling an estimated $11.4M and leaving 374,463 shares worth $38.2M. The position accounts for 0.02% of the portfolio, ranked #1039.

Millennium Management first reported a position in IRM in Q2 2013 and has held it in 40 quarters since. The position peaked at $76.9M in Q1 2024. 1,082 funds tracked by Wall St. Rank hold IRM as of Q1 2026.

  • Millennium Management held 374,463 shares of Iron Mountain worth $38.2M as of Q1 2026.
  • Millennium Management sold 114,551 Iron Mountain shares in Q1 2026, an estimated $11.4M.
  • Iron Mountain made up 0.02% of Millennium Management's portfolio in Q1 2026, its #1039 holding.
  • Millennium Management first reported a position in Iron Mountain in Q2 2013 and has held it in 40 quarters since.
  • Millennium Management's Iron Mountain position peaked at $76.9M in Q1 2024.
  • 1,082 funds tracked by Wall St. Rank held Iron Mountain as of Q1 2026.

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