National Pension Service’s Iron Mountain IRM Stock Holding History

National Pension Service’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	$57.4M	Buy	454,815 +25,423	+6%	+$3.12M	0.04%	335
2026 Q1	$43.9M	Sell	429,392 -79,628	-16%	-$7.92M	0.03%	359
2025 Q4	$42.2M	Buy	509,020 +13,540	+3%	+$1.27M	0.03%	378
2025 Q3	$50.5M	Buy	495,480 +19,319	+4%	+$1.86M	0.04%	312
2025 Q2	$48.8M	Buy	476,161 +3,240	+0.7%	+$305K	0.04%	301
2025 Q1	$40.7M	Buy	472,921 +70,108	+17%	+$6.76M	0.04%	339
2024 Q4	$42.3M	Sell	402,813 -56,665	-12%	-$6.66M	0.04%	330
2024 Q3	$54.6M	Buy	459,478 +61,187	+15%	+$6.54M	0.05%	289
2024 Q2	$35.7M	Sell	398,291 -18,837	-5%	-$1.52M	0.04%	353
2024 Q1	$33.5M	Buy	417,128 +3,199	+0.8%	+$232K	0.04%	375
2023 Q4	$29M	Hold	413,929	–	–	0.04%	386
2023 Q3	$24.8M	Sell	413,929 -14,260	-3%	-$871K	0.04%	400
2023 Q2	$24M	Sell	428,189 -39,135	-8%	-$2.14M	0.04%	431
2023 Q1	$24.2M	Sell	467,324 -44,515	-9%	-$2.33M	0.04%	401
2022 Q4	$25.5M	Buy	511,839 +10,238	+2%	+$517K	0.05%	379
2022 Q3	$22M	Sell	501,601 -29,045	-5%	-$1.47M	0.05%	405
2022 Q2	$25.8M	Buy	530,646 +12,164	+2%	+$640K	0.05%	370
2022 Q1	$28.7M	Buy	518,482 +435,237	+523%	+$20.7M	0.05%	407
2021 Q4	$4.36M	Hold	83,245	–	–	0.01%	460
2021 Q3	$3.62M	Buy	+83,245	New	+$3.75M	0.01%	460
2020 Q2	–	Sell	-2,742	Closed	-$65K	–	497
2020 Q1	$65K	Hold	2,742	–	–	﹤0.01%	483
2019 Q4	$87K	Sell	2,742 -5	-0.2%	-$164	﹤0.01%	485
2019 Q3	$89K	Hold	2,747	–	–	﹤0.01%	486
2019 Q2	$86K	Buy	+2,747	New	+$90K	﹤0.01%	493
2018 Q1	–	Sell	-1,609	Closed	-$61K	–	464
2017 Q4	$61K	Hold	1,609	–	–	﹤0.01%	431
2017 Q3	$62K	Buy	1,609 +313	+24%	+$11.7K	﹤0.01%	426
2017 Q2	$44K	Buy	1,296 +806	+164%	+$28.2K	﹤0.01%	429
2017 Q1	$17K	Hold	490	–	–	﹤0.01%	449
2016 Q4	$16K	Buy	+490	New	+$16.3K	﹤0.01%	485

Other funds holding IRM

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

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

National Pension Service's IRM Position: Q2 2026 in Review

National Pension Service increased its Iron Mountain (IRM) stake by 5.9% in Q2 2026, buying an estimated $3.12M and bringing the position to 454,815 shares worth $57.4M. The position accounts for 0.04% of the portfolio, ranked #335.

National Pension Service first reported a position in IRM in Q4 2016 and has held it in 29 quarters since. 962 funds tracked by Wall St. Rank hold IRM as of Q2 2026.

National Pension Service held 454,815 shares of Iron Mountain worth $57.4M as of Q2 2026.
National Pension Service bought 25,423 Iron Mountain shares in Q2 2026, an estimated $3.12M.
Iron Mountain made up 0.04% of National Pension Service's portfolio in Q2 2026, its #335 holding.
National Pension Service first reported a position in Iron Mountain in Q4 2016 and has held it in 29 quarters since.
962 funds tracked by Wall St. Rank held Iron Mountain as of Q2 2026.

Based on National Pension Service's 13F filing for Q2 2026, filed 13 Aug 2026.