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 Q2	$1.48M	Buy	11,707 +1,106	+10%	+$136K	1.27%	18
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

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return

Cohen & Steers New York $63.2B AUM 17.15% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return

Principal Financial Group Des Moines, Iowa $204B AUM 27.99% 1-Year Est. Return

J.M. Arbour's IRM Position: Q2 2026 in Review

J.M. Arbour increased its Iron Mountain (IRM) stake by 10% in Q2 2026, buying an estimated $136K and bringing the position to 11,707 shares worth $1.48M. The position accounts for 1.27% of the portfolio, ranked #18.

J.M. Arbour first reported a position in IRM in Q4 2025 and has held it in 3 quarters since. 1,174 funds tracked by Wall St. Rank hold IRM as of Q2 2026.

J.M. Arbour held 11,707 shares of Iron Mountain worth $1.48M as of Q2 2026.
J.M. Arbour bought 1,106 Iron Mountain shares in Q2 2026, an estimated $136K.
Iron Mountain made up 1.27% of J.M. Arbour's portfolio in Q2 2026, its #18 holding.
J.M. Arbour first reported a position in Iron Mountain in Q4 2025 and has held it in 3 quarters since.
1,174 funds tracked by Wall St. Rank held Iron Mountain as of Q2 2026.

Based on J.M. Arbour's 13F filing for Q2 2026, filed 14 Aug 2026.