# First Interstate Bancsystem, INC.: Health and welfare plan, 2,945 participants (Billings, MT)

**Score:** 35/100

| Field | Value |
|---|---|
| Employer (plan sponsor) | First Interstate Bancsystem, INC. |
| EIN | 810331430 |
| Plan | First Interstate Bancsystem INC Group Health Benefit Plan |
| Plan type | Health and welfare |
| Trigger | Plan with 100+ participants |
| Participants | 2945 |
| Industry | Management of companies |
| Location | Billings, MT |
| Plan effective | 1994-01-03 |
| Plan year | 2025 |
| Filed | 2026-09-21 |

## Why this score
- 2945 participants.

Source: U.S. Department of Labor EBSA Form 5500 filings (current plan-year dataset) (https://www.efast.dol.gov/5500search/). Last refreshed: 2026-11-04T01:39:03.295Z.
From public Form 5500 filings released by the U.S. Department of Labor. Employer and plan level only: we never list signers, contacts or participants. A final filing can mean a termination, merger or transfer; read the filing on EFAST.