EntityWire/Montana business entity search →/FIRST INTERSTATE BANCSYSTEM, INC.
Employer with a benefit plan
FIRST INTERSTATE BANCSYSTEM, INC.
The Employer Identification Number (EIN) for FIRST INTERSTATE BANCSYSTEM, INC. is 81-0331430.
At a glance
- EIN
- 81-0331430 · 810331430
- Legal name
- FIRST INTERSTATE BANCSYSTEM, INC.
- Also filed as
- FIRST INTERSTATE BANCSYSTEM OF MONTANA INC
- Address on file
- 401 NORTH 31ST STREET, BILLINGS, MT 591160918
- Records show
- SEC filer; employer with a benefit plan
- Latest record
- 2026-08-21
SEC records
SEC EDGAR company filings · records as of 2026-08-21
- SEC CIK
- 0000860413
- Source: SEC · as of 2026-08-21
- Industry (SIC)
- State Commercial Banks (6022)
- Source: SEC · as of 2026-08-21
- State of incorporation
- DE
- Source: SEC · as of 2026-08-21
- Ticker
- FIBK
- Source: SEC · as of 2026-08-21
- Latest SEC filing
- 8-K 2026-08-21
- Source: SEC · as of 2026-08-21
Benefit plans
DOL Form 5500 filings (EFAST2) · records as of 2025-10-13
- Benefit plan 502, 2024 filing
- FIRST INTERSTATE BANCSYSTEM INC FLEX BENEFITS PLAN
- Source: DOL 5500 · as of 2025-10-13
- Participants (start of year)
- 467
- Source: DOL 5500 · as of 2025-10-13
- Plan features
- Health (other than dental or vision); Life insurance; Dental; Vision; Temporary disability; Long-term disability
- Source: DOL 5500 · as of 2025-10-13
- Plan type
- Single-employer plan
- Source: DOL 5500 · as of 2025-10-13
- Business code (NAICS)
- 551111
- Source: DOL 5500 · as of 2025-10-13
- Benefit plan 3, 2024 filing
- FIRST INTERSTATE BANCSYSTEM, INC. 401(K) PLAN
- Source: DOL 5500 · as of 2025-10-10
- Participants (start of year)
- 5,188
- Source: DOL 5500 · as of 2025-10-10
- Plan features
- Participant-directed; 401(k) feature; 401(m) matching; Pension plan with defined contribution; Automatic enrollment; Profit-sharing
- Source: DOL 5500 · as of 2025-10-10
- Plan type
- Single-employer plan
- Source: DOL 5500 · as of 2025-10-10
What this record is
Public filings that carry this EIN (DOL Form 5500 filings (EFAST2) and SEC EDGAR company filings), shown as filed. Nothing is scraped from the IRS, and a public-record match is not IRS TIN validation.
What it is not
Registry status, formation date, and registered agent come from the Montana Secretary of State, Business Services Division; see the Montana business entity search.
If something is wrong
A name, address, or classification here is what the source published. To correct the source, file with it; to have this page removed, see corrections and removal.
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