J.M. Arbour’s Iron Mountain IRM Stock Holding History

J.M. Arbour’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	$1.08M	Sell	10,601 -259	-2%	-$25.8K	1.04%	29
2025 Q4	$901K	Buy	+10,860	New	+$1.02M	0.9%	34

Other funds holding IRM

BlackRock New York $6.73T AUM 46.02% 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 $3.37T AUM 44.26% 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 $204B AUM 27.99% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

J.M. Arbour's IRM Position: Q1 2026 in Review

J.M. Arbour reduced its Iron Mountain (IRM) stake by 2.4% in Q1 2026, selling an estimated $25.8K and leaving 10,601 shares worth $1.08M. The position accounts for 1.04% of the portfolio, ranked #29.

J.M. Arbour first reported a position in IRM in Q4 2025 and has held it in 2 quarters since. 1,087 funds tracked by Wall St. Rank hold IRM as of Q1 2026.

J.M. Arbour held 10,601 shares of Iron Mountain worth $1.08M as of Q1 2026.
J.M. Arbour sold 259 Iron Mountain shares in Q1 2026, an estimated $25.8K.
Iron Mountain made up 1.04% of J.M. Arbour's portfolio in Q1 2026, its #29 holding.
J.M. Arbour first reported a position in Iron Mountain in Q4 2025 and has held it in 2 quarters since.
1,087 funds tracked by Wall St. Rank held Iron Mountain as of Q1 2026.

Based on J.M. Arbour's 13F filing for Q1 2026, filed 21 Apr 2026.