When did IRM join the S&P 500?

Iron Mountain joined the S&P 500 index on 2009-01-06.

What sector is IRM in?

IRM is in the Real Estate sector, Other Specialized REITs industry.

IRM — Iron Mountain

Name: IRM Institutional Holdings (13F) — 2026Q1
Creator: SEC EDGAR
License: https://www.sec.gov/data

Other Specialized REITs · Real Estate

Iron Mountain is an information management services provider organized and operated as a real estate investment trust (REIT). The company offers solutions to address customers' needs in information management, digital transformation, information security, data centers, and asset lifecycle management (ALM). Its customers span various industries, including commercial, legal, financial, healthcare, and technology. The company has two reportable segments: Global Records and Information Management (Global RIM) and Global Data Centers. The Global RIM segment generates the majority of the company's revenue, providing data and records management, secure shredding, consumer storage, and related services. Geographically, the United States contributes the largest share of revenue.

Key Facts

Status	Active
Sector	Real Estate
Industry	Other Specialized REITs
Joined	2009-01-06
Tenure	17 yrs

S&P 500 Timeline

2009-01-06Joined S&P 500

Industry Peers

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Sector Peers

AMT ARE AVB BXP CBRE CCI CPT CSGP DLR DOC

Institutional Holdings (13F)

1 institutions hold IRM, totaling 785K shares ($769057) · As of 2026Q1

Rank	Institution	Shares	Value
1	Pacer Advisors, Inc.	785K	$769057

View all holders →

Data source: Wikipedia · CC BY-SA 4.0 · SEC EDGAR 13F · Updated 2026-07-10