---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-23-024768"
form_type: "8-K"
ticker: "IRM"
cik: "0001020569"
company_name: "IRON MOUNTAIN INC"
filed_at: "2023-02-23T23:59:59+00:00"
generated_at: "2026-06-19T01:16:12.611271+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.1
calibrated_materiality_score: 0.1
confidence: "high"
source: SEC EDGAR
---

# Iron Mountain updates REIT tax disclosure; counsel confirms REIT status for 2014-2022

## Summary
- Filed updated material U.S. federal income tax considerations for REIT qualification and stock ownership.
- Sullivan & Worcester LLP opines Iron Mountain qualified as REIT for 2014-2022 and expects continued qualification.
- New disclosure replaces and supersedes prior descriptions of federal income tax treatment.
- No changes to operations, financials, or dividend policy; routine tax disclosure update.

## SEC filing metadata
- accession: 0001104659-23-024768
- form_type: 8-K
- ticker: IRM
- cik: 0001020569
- company_name: IRON MOUNTAIN INC
- filed_at: 2023-02-23T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.1
- calibrated_materiality_score: 0.1
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1020569/000110465923024768/0001104659-23-024768-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1020569/000110465923024768/tm237555d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-23-024768
- JSON: https://secwatch.observer/filing/0001104659-23-024768.json
- Plain text: https://secwatch.observer/filing/0001104659-23-024768.txt

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