Arrowstreet Capital’s Iron Mountain IRM Stock Holding History

Arrowstreet Capital’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	$218K	Buy	+1,722	New	+$211K	﹤0.01%	1846
2020 Q4	–	Sell	-9,300	Closed	-$249K	–	2409
2020 Q3	$249K	Sell	9,300 -62,645	-87%	-$1.78M	﹤0.01%	2164
2020 Q2	$1.88M	Sell	71,945 -50,055	-41%	-$1.26M	﹤0.01%	1511
2020 Q1	$2.9M	Buy	+122,000	New	+$3.69M	0.01%	934
2016 Q4	–	Sell	-81,400	Closed	-$3.06M	–	2079
2016 Q3	$3.06M	Buy	+81,400	New	+$3.14M	0.01%	798
2016 Q2	–	Sell	-52,467	Closed	-$1.78M	–	1416
2016 Q1	$1.78M	Sell	52,467 -273,233	-84%	-$7.85M	0.01%	844
2015 Q4	$8.8M	Buy	325,700 +262,500	+415%	+$7.7M	0.04%	384
2015 Q3	$1.96M	Sell	63,200 -54,700	-46%	-$1.63M	0.01%	755
2015 Q2	$3.65M	Buy	117,900 +107,900	+1,079%	+$3.78M	0.02%	502
2015 Q1	$365K	Buy	+10,000	New	+$386K	﹤0.01%	882
2013 Q4	–	Sell	-6,277	Closed	-$157K	–	1222
2013 Q3	$157K	Sell	6,277 -60,044	-91%	-$1.53M	﹤0.01%	921
2013 Q2	$1.63M	Buy	+66,321	New	+$2.14M	0.01%	484

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

Arrowstreet Capital's IRM Position: Q2 2026 in Review

Arrowstreet Capital opened a new position in Iron Mountain (IRM) in Q2 2026: 1,722 shares worth $218K. The stake represents ﹤0.01% of the portfolio and ranks #1846 among its holdings. This is a return to the name: Arrowstreet Capital previously reported a position in IRM as recently as Q3 2020.

Arrowstreet Capital first reported a position in IRM in Q2 2013 and has held it in 12 quarters since. The position peaked at $8.8M in Q4 2015. 1,174 funds tracked by Wall St. Rank hold IRM as of Q2 2026.

Arrowstreet Capital held 1,722 shares of Iron Mountain worth $218K as of Q2 2026.
Iron Mountain was a new Arrowstreet Capital position in Q2 2026.
Iron Mountain made up ﹤0.01% of Arrowstreet Capital's portfolio in Q2 2026, its #1846 holding.
Arrowstreet Capital first reported a position in Iron Mountain in Q2 2013 and has held it in 12 quarters since.
Arrowstreet Capital's Iron Mountain position peaked at $8.8M in Q4 2015.
1,174 funds tracked by Wall St. Rank held Iron Mountain as of Q2 2026.

Based on Arrowstreet Capital's 13F filing for Q2 2026, filed 13 Aug 2026.