Employer with a benefit plan ยท SEC filer
IRON MOUNTAIN INCORPORATED
Also filed as IRON MOUNTAIN INC/PA; PIERCE LEAHY CORP
1101 ENTERPRISE DRIVE, ROYERSFORD, PA 19468
EIN
23-2588479
SEC CIK
0001020569
SEC · 2026-09-02
Industry (SIC)
Real Estate Investment Trusts (6798)
SEC · 2026-09-02
State of incorporation
DE
SEC · 2026-09-02
Ticker
IRM
SEC · 2026-09-02
Latest SEC filing
4 2026-09-02
SEC · 2026-09-02
Benefit plan 510, 2024 filing
THE IRON MOUNTAIN COMPANIES WELFARE PLAN
DOL · 2025-11-05
Participants (start of year)
10,031
DOL · 2025-11-05
Plan features
code 4A4B4D4E4F4G4H4L4Q
DOL · 2025-11-05
Plan type
Single-employer plan
DOL · 2025-11-05
Business code (NAICS)
493100
DOL · 2025-11-05
Benefit plan 1, 2024 filing
THE IRON MOUNTAIN COMPANIES 401(K) PLAN
DOL · 2025-10-10
Participants (start of year)
12,353
DOL · 2025-10-10
Plan features
code 2E2F2G2J2K2R2S2T3D3H
DOL · 2025-10-10
Plan type
Single-employer plan
DOL · 2025-10-10