---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-25-014194"
form_type: "8-K"
ticker: "IRM"
cik: "0001020569"
company_name: "IRON MOUNTAIN INC"
filed_at: "2025-02-14T23:59:59+00:00"
generated_at: "2026-05-26T19:05:00.468868+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.0
calibrated_materiality_score: 0.0
confidence: "high"
source: SEC EDGAR
---

# Iron Mountain files updated federal income tax disclosure for REIT qualification

## Summary
- Filed Exhibit 99.1 replacing prior descriptions of U.S. federal income tax considerations.
- Tax disclosure covers REIT qualification, taxation, and stock ownership/disposition.
- Counsel Sullivan & Worcester LLP opines Iron Mountain qualified as a REIT through 2024.
- No changes to business operations, financials, or dividend policy announced.
- Update is a routine legal filing; no material new information for investors.

## SEC filing metadata
- accession: 0001104659-25-014194
- form_type: 8-K
- ticker: IRM
- cik: 0001020569
- company_name: IRON MOUNTAIN INC
- filed_at: 2025-02-14T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.0
- calibrated_materiality_score: 0.0
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1020569/000110465925014194/0001104659-25-014194-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1020569/000110465925014194/tm256382d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-014194
- JSON: https://secwatch.observer/filing/0001104659-25-014194.json
- Plain text: https://secwatch.observer/filing/0001104659-25-014194.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.