401(k) · DOL Form 5500 · 2024

First Interstate Bancsystem, Inc. 401(k) Plan

Data updated 2026-08-11

$482M
Total assets: 3,530
Participants: 97th
Percentile by assets: $136,469
Avg per participant

Official DOL plan name: First Interstate Bancsystem, Inc. 401(k) Plan · Sponsored by First Interstate Bancsystem, Inc. · Montana · Finance & Insurance

$482M in assets, 3,530 participants

First Interstate Bancsystem, Inc.'s First Interstate Bancsystem, Inc. 401(k) Plan reported $482M in total assets and 3,530 participants in its 2024 DOL Form 5500 filing, ranking in the 97th percentile by assets among filed plans. Figures are as reported by the plan sponsor to the Department of Labor, not audited or endorsed by PlainRetire.

97th percentile by assets (of 123,622 plans)
#8,108 in Finance & Insurance (8,549 peers)

Coverage in Montana

First Interstate Bancsystem, Inc. 401(k) Plan covers 3,530 participants in Montana, 13x the typical Montana plan (state average ~271 per filing). Assets: $482M.

$482M
total plan assets (2024 EOY): 3,530
covered participants: 97th
percentile by assets (of 123,622 plans): $136,469
avg assets per participant

Where First Interstate Bancsystem, Inc. 401(k) Plan sits by total assets

First Interstate Bancsystem, Inc. 401(k) Plan vs every filed plan by assets

End-of-year total assets · plan year 2024 · DOL Form 5500

$481,734,557 Top 3% higher than 97% of 123,620 filed plans

Dashed line + filled bar = this entry, among filed plans.

Source U.S. Department of Labor Form 5500 filings (EBSA) · plan year 2024

First Interstate Bancsystem, Inc. 401(k) Plan end-of-year assets rose from $454M in the plan year 2023 filing to $482M in the plan year 2024 filing.
First Interstate Bancsystem, Inc. 401(k) Plan reported participants fell from 3,750 in the plan year 2023 filing to 3,530 in the plan year 2024 filing.
First Interstate Bancsystem, Inc. 401(k) Plan reported net income rose from $28M in the plan year 2023 filing to $28M in the plan year 2024 filing.

See the national 2023→2024 release diff →

State

Montana

Industry

Finance & Insurance

Participants vs Montana filers

In Montana, the average filing covers about 271 participants across 404 plans. First Interstate Bancsystem, Inc. 401(k) Plan reports 3,530 participants - 13x that state average ($482M EOY assets).

Montana filing particulars

Total Assets (Beginning of Year)	$454M
Net Assets (End of Year)	$482M
Net Income	$28M
Employer EIN	810331430
Plan Effective Date	1983-07-01
Filing Status	FILING RECEIVED

Sponsor Plan History (First Interstate Bancsystem, Inc.)

Total plan assets by year, all First Interstate Bancsystem, Inc. plans on file

Year	Plans	Participants	Total Assets
2022	1	2,313	$426M
2023	1	3,750	$454M
2024	1	3,530	$482M

Nearby 401(k) Plans in Montana

Peer 401(k) plans, same state, same plan type, ranked by total assets.

First Interstate Bancsystem, Inc. 401(k) Plan vs. nearby 401(k) plans in Montana, assets vs. participants

D.a. Davidson Companies Retirement Savings and Profit Sharing Plan $623M · 1,619
Glacier Bancorp, Inc. Profit Sharing and 401(k) Plan $538M · 3,215
Northwestern Energy 401(k) Retirement Savings Plan $513M · 1,571
Logan Health Retirement Savings Plan $500M · 4,288
Washington Companies 401(k) Retirement Savings Plan $313M · 2,112

Compare First Interstate Bancsystem, Inc. 401(k)… side-by-side with 3 peers →

Similar-Sized 401(k) Plans Nationally

401(k) plans in other states closest to First Interstate Bancsystem, Inc. 401(k) Plan by total assets, not by location.

Amerigas Propane, Inc. Savings Plan (PA) $482M · 5,004
Electrolux Home Products, Inc. Retirement Savings Plan (NC) $481M · 2,247
Bjc 403(b) Plan (MO) $481M · 5,282
Albany International Corp. Prosperity Plus Savings Plan (NH) $481M · 1,909

Frequently Asked Questions

How did First Interstate Bancsystem, Inc. 401(k) Plan assets move in 2024? ▼

First Interstate Bancsystem, Inc. 401(k) Plan grew at a solid clip - up 6.2% during 2024, from $454M to $482M. Reported net income was $28M.

How have First Interstate Bancsystem, Inc. plan assets changed over time? ▼

Across 3 plan years on file (2022-2024), First Interstate Bancsystem, Inc.'s sponsor-wide assets grew 13.1%, from $426M to $482M.

Where does First Interstate Bancsystem, Inc. 401(k) Plan rank by assets among Form 5500 filers? ▼

First Interstate Bancsystem, Inc. 401(k) Plan ranks in the 97th percentile by end-of-year assets among 123,622 plans that reported assets for plan year 2024 (in the top 5% of all filed plans by assets).

Which 401(k) plans are similar in size to First Interstate Bancsystem, Inc. 401(k) Plan? ▼

Among 401(k) plans in other states, the closest by assets is Amerigas Propane, Inc. Savings Plan in PA ($482M, 5,004 participants).

Next read for First Interstate Bancsystem, Inc. 401(k)…

Filing takeaways

Ways to act on First Interstate Bancsystem, Inc. 401(k) Plan's numbers.

By total assets, First Interstate Bancsystem, Inc. 401(k) Plan ranks in the top 5% of all filed plans by assets. See the largest plans
Compare it side-by-side against 3 similar 401(k) plans in Montana. Compare plans
First Interstate Bancsystem, Inc.'s sponsor-wide assets have grown 13.1% since 2022 across 3 plan years on file. More Finance & Insurance plans

Source: U.S. Department of Labor, Employee Benefits Security Administration (EBSA), Form 5500 public disclosure dataset. Plan year 2024.

Source: DOL EFAST2 filing system (efast.dol.gov) - original filing retrieval by EIN 810331430.