STATE OF WISCONSIN INVESTMENT BOARD

Position in IRM — Iron Mountain Inc

CIK 854157 MADISON, WI

Position in IRM

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$18,029,752

+$3,668,038 QoQ

Shares Held

176,520

+2.0% QoQ

Ownership

0.059%

of shares outstanding

% of Portfolio

0.05%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Real Estate · as of Mar 31, 2026

STATE OF WISCONSIN INVESTMENT BOARD holds $218,615,372 across 15 REIT - Specialty names. IRM ranks #5 (8.2% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	EQIX	Equinix Inc	53,781	$52,718,287
2	AMT	American Tower Corp /Ma/	250,695	$43,264,943
3	DLR	Digital Realty Trust, Inc.	183,664	$33,098,089
4	CCI	Crown Castle Inc.	240,805	$19,579,854
5	IRM	Iron Mountain Inc This page	176,520	$18,029,752
6	WY	Weyerhaeuser Co	613,647	$14,991,396
7	SBAC	Sba Communications Corp	64,834	$11,158,579
8	GLPI	Gaming & Leisure Properties, Inc.	168,339	$7,469,201

25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$18,029,752	176,520	+2.0%	Shares	Sole	2026-05-15
2025-12-31	$14,361,714	173,137	-1.0%	Shares	Sole	2026-02-17
2025-09-30	$17,823,801	174,846	-3.2%	Shares	Sole	2025-11-14
2025-06-30	$18,530,911	180,666	-3.8%	Shares	Sole	2025-08-14
2025-03-31	$16,157,193	187,787	+5.1%	Shares	Sole	2025-05-15
2024-12-31	$18,775,589	178,628	-4.4%	Shares	Sole	2025-02-14
2024-09-30	$22,192,096	186,755	+11.0%	Shares	Sole	2024-11-14
2024-06-30	$15,077,220	168,235	-0.4%	Shares	Sole	2024-08-14
2024-03-31	$13,542,094	168,833	-11.1%	Shares	Sole	2024-05-14
2023-12-31	$13,284,723	189,836	+1.6%	Shares	Sole	2024-02-12
2023-09-30	$11,109,837	186,877	+10.3%	Shares	Sole	2023-11-14
2023-06-30	$9,627,467	169,438	+6.0%	Shares	Sole	2023-08-14
2023-03-31	$8,455,388	159,807	+46.3%	Shares	Sole	2023-05-15
2022-12-31	$5,445,663	109,241	+12.5%	Shares	Sole	2023-02-14
2022-09-30	$4,269,970	97,111	-23.5%	Shares	Sole	2022-11-14
2022-06-30	$6,179,053	126,906	-5.6%	Shares	Sole	2022-08-15
2022-03-31	$7,450,871	134,468	-1.2%	Shares	Sole	2022-05-13
2021-12-31	$7,119,234	136,045	-1.6%	Shares	Sole	2022-02-11
2021-09-30	$6,009,830	138,316	+7.4%	Shares	Sole	2021-11-12
2021-06-30	$5,450,816	128,800	-3.5%	Shares	Sole	2021-08-12
2021-03-31	$4,937,393	133,407	-3.2%	Shares	Sole	2021-05-17
2020-12-31	$4,063,965	137,855	-9.0%	Shares	Sole	2021-02-03
2020-09-30	$4,059,086	151,515	+0.6%	Shares	Sole	2020-11-16
2020-06-30	$3,931,312	150,625	-1.7%	Shares	Sole	2020-08-12
2020-03-31	$3,646,993	153,235	—	Shares	Sole	2020-05-06
No filing history on record for this holder in this stock.