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	$6.88M	Sell	67,400 -7,200	-10%	-$716K	﹤0.01%	2582
2025 Q4	$6.19M	Buy	74,600 +39,300	+111%	+$3.68M	﹤0.01%	2775
2025 Q3	$3.6M	Sell	35,300 -7,800	-18%	-$751K	﹤0.01%	3478
2025 Q2	$4.42M	Sell	43,100 -12,600	-23%	-$1.19M	﹤0.01%	3123
2025 Q1	$4.79M	Buy	55,700 +2,300	+4%	+$222K	﹤0.01%	2907
2024 Q4	$5.61M	Buy	53,400 +50,000	+1,471%	+$5.87M	﹤0.01%	2720
2024 Q3	$404K	Buy	+3,400	New	+$364K	﹤0.01%	4996
2023 Q1	–	Sell	-30,300	Closed	-$1.51M	–	6594
2022 Q4	$1.51M	Hold	30,300	–	–	﹤0.01%	3802
2022 Q3	$1.33M	Buy	+30,300	New	+$1.53M	﹤0.01%	4101
2021 Q4	–	Sell	-40,700	Closed	-$1.77M	–	7093
2021 Q3	$1.77M	Buy	+40,700	New	+$1.83M	﹤0.01%	4067
2014 Q4	–	Sell	-29,000	Closed	-$947K	–	4090
2014 Q3	$947K	Buy	29,000 +2,058	+8%	+$66.7K	﹤0.01%	2350
2014 Q2	$883K	Buy	+26,942	New	+$731K	﹤0.01%	2269
2014 Q1	–	Sell	-10,387	Closed	-$291K	–	3679
2013 Q4	$291K	Buy	+10,387	New	+$266K	﹤0.01%	3056
2013 Q3	–	Sell	-69,464	Closed	-$1.71M	–	3439
2013 Q2	$1.71M	Buy	+69,464	New	+$2.24M	0.01%	1685

Other funds holding IRM

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 Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Cohen & Steers New York $57.6B AUM 8.03% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

Principal Financial Group Des Moines, Iowa $187B AUM 18.48% 1-Year Est. Return

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.