BlackRock’s Iron Mountain IRM Stock Holding History

BlackRock’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	$4.24B	Buy	33,570,910 +549,556	+2%	+$67.4M	0.06%	255
2026 Q1	$3.37B	Buy	33,021,354 +101,696	+0.3%	+$10.1M	0.06%	279
2025 Q4	$2.73B	Buy	32,919,658 +1,210,594	+4%	+$113M	0.05%	317
2025 Q3	$3.23B	Buy	31,709,064 +430,437	+1%	+$41.5M	0.06%	285
2025 Q2	$3.21B	Sell	31,278,627 -3,944,152	-11%	-$372M	0.06%	276
2025 Q1	$3.03B	Buy	35,222,779 +3,149,907	+10%	+$304M	0.06%	267
2024 Q4	$3.37B	Buy	32,072,872 +763,235	+2%	+$89.7M	0.07%	251
2024 Q3	$3.72B	Buy	31,309,637 +3,417,677	+12%	+$366M	0.08%	223
2024 Q2	$2.5B	Buy	27,891,960 +4,783,129	+21%	+$387M	0.06%	296
2024 Q1	$1.85B	Sell	23,108,831 -163,962	-0.7%	-$11.9M	0.04%	390
2023 Q4	$1.63B	Buy	23,272,793 +1,134,334	+5%	+$71.2M	0.04%	404
2023 Q3	$1.32B	Sell	22,138,459 -243,394	-1%	-$14.9M	0.04%	435
2023 Q2	$1.27B	Sell	22,381,853 -23,877	-0.1%	-$1.31M	0.04%	462
2023 Q1	$1.19B	Sell	22,405,730 -213,158	-0.9%	-$11.2M	0.04%	475
2022 Q4	$1.13B	Sell	22,618,888 -120,419	-0.5%	-$6.08M	0.04%	477
2022 Q3	$1,000M	Sell	22,739,307 -85,662	-0.4%	-$4.33M	0.03%	489
2022 Q2	$1.11B	Sell	22,824,969 -91,301	-0.4%	-$4.8M	0.04%	479
2022 Q1	$1.27B	Sell	22,916,270 -81,826	-0.4%	-$3.9M	0.03%	488
2021 Q4	$1.2B	Buy	22,998,096 +127,479	+0.6%	+$6.03M	0.03%	531
2021 Q3	$994M	Sell	22,870,617 -263,923	-1%	-$11.9M	0.03%	586
2021 Q2	$979M	Buy	23,134,540 +258,708	+1%	+$10.9M	0.03%	608
2021 Q1	$847M	Buy	22,875,832 +298,008	+1%	+$9.96M	0.02%	670
2020 Q4	$666M	Sell	22,577,824 -419	-0%	-$11.6K	0.02%	713
2020 Q3	$605M	Buy	22,578,243 +362,165	+2%	+$10.3M	0.02%	649
2020 Q2	$580M	Buy	22,216,078 +276,578	+1%	+$6.98M	0.02%	627
2020 Q1	$522M	Buy	21,939,500 +620,431	+3%	+$18.8M	0.03%	587
2019 Q4	$679M	Buy	21,319,069 +256,098	+1%	+$8.4M	0.03%	629
2019 Q3	$682M	Buy	21,062,971 +407,252	+2%	+$12.8M	0.03%	574
2019 Q2	$647M	Buy	20,655,719 +384,196	+2%	+$12.6M	0.03%	611
2019 Q1	$719M	Buy	20,271,523 +147,381	+0.7%	+$5.21M	0.03%	546
2018 Q4	$652M	Buy	20,124,142 +231,023	+1%	+$7.58M	0.03%	535
2018 Q3	$687M	Buy	19,893,119 +509,524	+3%	+$18.2M	0.03%	578
2018 Q2	$679M	Sell	19,383,595 -1,056,371	-5%	-$35.7M	0.03%	551
2018 Q1	$672M	Buy	20,439,966 +423,622	+2%	+$14.3M	0.03%	557
2017 Q4	$755M	Buy	20,016,344 +929,906	+5%	+$36.9M	0.04%	507
2017 Q3	$742M	Buy	19,086,438 +161,996	+0.9%	+$6.05M	0.04%	489
2017 Q2	$650M	Buy	18,924,442 +896,751	+5%	+$31.4M	0.03%	519
2017 Q1	$643M	Buy	18,027,691 +17,560,886	+3,762%	+$622M	0.04%	525
2016 Q4	$15.2M	Buy	466,805 +18,804	+4%	+$625K	0.02%	629
2016 Q3	$16.8M	Sell	448,001 -14,768	-3%	-$570K	0.02%	594
2016 Q2	$18.4M	Buy	462,769 +121,893	+36%	+$4.44M	0.03%	556
2016 Q1	$11.6M	Sell	340,876 -111,801	-25%	-$3.21M	0.02%	641
2015 Q4	$12.2M	Buy	452,677 +33,381	+8%	+$979K	0.02%	633
2015 Q3	$13M	Buy	419,296 +11,745	+3%	+$350K	0.02%	579
2015 Q2	$12.6M	Sell	407,551 -60,477	-13%	-$2.12M	0.02%	622
2015 Q1	$17.1M	Buy	468,028 +42,152	+10%	+$1.63M	0.02%	563
2014 Q4	$16.5M	Buy	425,876 +71,235	+20%	+$2.59M	0.02%	578
2014 Q3	$11.6M	Sell	354,641 -16,900	-5%	-$548K	0.02%	651
2014 Q2	$12.2M	Buy	371,541 +22,441	+6%	+$609K	0.02%	634
2014 Q1	$8.9M	Sell	349,100 -490	-0.1%	-$12.5K	0.01%	694
2013 Q4	$9.81M	Buy	349,590 +2,853	+0.8%	+$73.1K	0.02%	670
2013 Q3	$8.66M	Buy	346,737 +15,113	+5%	+$384K	0.02%	638
2013 Q2	$8.16M	Buy	+331,624	New	+$10.7M	0.02%	639

Other funds holding IRM

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 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

Northern Trust Chicago, Illinois $860B AUM 41.15% 1-Year Est. Return

Norges Bank Oslo, Norway $1T AUM

UBS AM Chicago, Illinois $550B AUM 43.33% 1-Year Est. Return

BlackRock's IRM Position: Q2 2026 in Review

BlackRock increased its Iron Mountain (IRM) stake by 1.7% in Q2 2026, buying an estimated $67.4M and bringing the position to 33,570,910 shares worth $4.24B. The position accounts for 0.06% of the portfolio, ranked #255.

BlackRock first reported a position in IRM in Q2 2013 and has held it in 53 quarters since. 957 funds tracked by Wall St. Rank hold IRM as of Q2 2026.

BlackRock held 33,570,910 shares of Iron Mountain worth $4.24B as of Q2 2026.
BlackRock bought 549,556 Iron Mountain shares in Q2 2026, an estimated $67.4M.
Iron Mountain made up 0.06% of BlackRock's portfolio in Q2 2026, its #255 holding.
BlackRock first reported a position in Iron Mountain in Q2 2013 and has held it in 53 quarters since.
957 funds tracked by Wall St. Rank held Iron Mountain as of Q2 2026.

Based on BlackRock's 13F filing for Q2 2026, filed 7 Aug 2026.