EntityWire

EntityWire / EIN 81-0331430

Employer with a benefit plan

FIRST INTERSTATE BANCSYSTEM, INC.

EIN 81-0331430. What DOL Form 5500 filings (EFAST2) and SEC EDGAR company filings say about this entity, with the source and date on every fact. Latest record 2026-08-21.

Employer with a benefit plan ยท SEC filer

FIRST INTERSTATE BANCSYSTEM, INC.

Also filed as FIRST INTERSTATE BANCSYSTEM OF MONTANA INC

401 NORTH 31ST STREET, BILLINGS, MT 591160918

EIN

81-0331430

SEC CIK

0000860413

SEC · 2026-08-21

Industry (SIC)

State Commercial Banks (6022)

SEC · 2026-08-21

State of incorporation

DE

SEC · 2026-08-21

Ticker

FIBK

SEC · 2026-08-21

Latest SEC filing

8-K 2026-08-21

SEC · 2026-08-21

Benefit plan 502, 2024 filing

FIRST INTERSTATE BANCSYSTEM INC FLEX BENEFITS PLAN

DOL · 2025-10-13

Participants (start of year)

467

DOL · 2025-10-13

Plan features

code 4A4B4D4E4F4H

DOL · 2025-10-13

Plan type

Single-employer plan

DOL · 2025-10-13

Business code (NAICS)

551111

DOL · 2025-10-13

Benefit plan 3, 2024 filing

FIRST INTERSTATE BANCSYSTEM, INC. 401(K) PLAN

DOL · 2025-10-10

Participants (start of year)

5,188

DOL · 2025-10-10

Plan features

code 2G2J2K2S2T2E2F3D

DOL · 2025-10-10

Plan type

Single-employer plan

DOL · 2025-10-10

From DOL Form 5500 filings (EFAST2) · SEC EDGAR company filings. Latest record 2026-08-21.

What this record is

Public federal filings that carry this EIN, shown as filed. Nothing here is scraped from the IRS and nothing is inferred.

What it is not

Registry status, formation date, and registered agent come from the state where the entity is registered, not from these federal filings.

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.

Look up another business

Free. Federal filings and state registries, stamped with their source and date.