State retirement profile · Form 5500

Retirement Plans in Idaho

According to DOL Form 5500 filings (plan year 2024), employer-sponsored 401(k), pension, and other retirement plans headquartered in Idaho report the totals below.

Data updated 2026-08-25

760
Plans
$31.4B
Total assets
#40
By assets

$31.4B across 760 plans

According to DOL Form 5500 filings (plan year 2024), Idaho has 760 employer-sponsored retirement plans holding $31.4B in total assets for 263,721 participants, ranking 40th nationally by plan assets, with 76% structured as 401(k)s and an average of $41M per plan.

  • 40th nationally by plan assets
  • 76% 401(k) plans

The state in one line

Idaho hosts 760 employer-sponsored retirement plans holding $31.4B for 263,721 participants, the 40th-largest state by plan assets.

$31.4B
total plan assets
760
employer plans
$118,943
avg assets per participant
76%
of plans are 401(k)s
401(k) Plans
579
Participants
263,721

What the Form 5500 Data Shows for Idaho

Idaho: 760 employer-sponsored plans (579 401(k)), $31.4B aggregate assets, 263,721 participants. Average plan: $41M; largest is Winco Employee Stock Ownership Plan at $5.0B. Leading sector by assets: Manufacturing (29%). These figures aggregate the 760 Form 5500 filings Idaho sponsors submitted for plan year 2024, counted by sponsor headquarters rather than participant residence; a plan administered in Idaho can cover workers across several states, and the methodology page details that HQ-vs-residence distinction. DOL Form 5500 methodology + HQ-vs-residence caveats →

Winco Employee Stock Ownership Plan accounts for 16.1% of all Idaho retirement plan assets

That concentration means Idaho-wide averages can mask substantial variation outside the dominant entity. Winco Holdings, Inc. sponsors the filing; drill into the plan page for schedules and audit detail. When one entity dominates a region's footprint, its programmatic and budget decisions effectively set policy for a majority of participants counted in this state total.

DOL Form 5500 plan year 2024

Manufacturing leads Idaho plan assets (29%)

Among plans headquartered here, Manufacturing accounts for $9.1B across 98 filings, ahead of Retail Trade at $7.0B. Sector mix is a Form 5500-derived signal: it reflects where sponsors file from, not where every participant lives.

DOL Form 5500 plan year 2024

Idaho hosts 52 ESOP filings

Employee Stock Ownership Plans here hold $6.5B. ESOP density is uneven across states; when the count clears a meaningful floor, the ESOP ranking and industry pages are the better drill-downs than a 401(k)-only read.

DOL Form 5500 plan year 2024

Where Idaho sits in the Form 5500 corpus

Idaho sits mid-pack by plan assets (#40 of 56). Peer states with similar totals are the fairest comparison set; national leaders will dominate any unfiltered ranking.

DOL Form 5500 plan year 2024

Idaho's place in the national asset distribution

All states with reported Form 5500 plan assets · plan year 2024

$31,367,778,015 30th percentile higher than 30% of 56 states with reported plan assets

Idaho $0 $1,324,371,844,360 state retirement-plan assets, bucketed by value

Dashed line + filled bar = this entry, among states with reported plan assets.

Source U.S. Department of Labor, EBSA Form 5500 public disclosure dataset · plan year 2024

Idaho's retirement-plan mix

1. 401(k)5792. Profit Sharing723. ESOP524. Defined Benefit (Pension)335. Other21
The five most common Form 5500 plan types among sponsors headquartered in Idaho. This count describes filings, not participants or assets.

Source: U.S. Department of Labor, EBSA Form 5500 public disclosure dataset · plan year 2024.

Industry mix in Idaho

Top sectors by Form 5500 plan assets for sponsors headquartered here (plan year 2024).

Industry Plans Assets
Manufacturing 98 $9.1B
Retail Trade 73 $7.0B
Professional & Technical Services 83 $5.8B
Healthcare & Social Assistance 130 $3.4B
Utilities 8 $1.9B

Largest Plans in Idaho

# Plan Name Type Participants Total Assets
1 Winco Employee Stock Ownership Plan ESOP 17,054 $5.0B
2 Micron Technology Inc. Retirement at Micron (Ram) Plan 401(k) 8,598 $3.7B
3 Idaho National Laboratory Employee Investment Plan 401(k) 6,632 $2.5B
4 Idaho National Laboratory Employee Retirement Plan Defined Benefit (Pension) 930 $2.0B
5 Simplot Retirement Savings Plan 401(k) 9,012 $1.6B
6 St. Lukes Health System Matched 403b Plan Other 17,370 $1.1B
7 Retirement Plan of Idaho Power Company Defined Benefit (Pension) 2,113 $971M
8 Idaho Power Company Employee Savings Plan 401(k) 2,119 $890M
9 St. Luke's Health System Performance Incentive and 401(a) Matching Plan Profit Sharing 17,370 $770M
10 Boise Cascade Company Savings Plan 401(k) 3,902 $740M
11 Power Profit Sharing 401(k) Plan 401(k) 3,637 $592M
12 Lamb Weston, Inc. 401(k) Plan for Salaried and Hourly Employees 401(k) 2,174 $444M
13 Glanbia Companies 401(k) Plan 401(k) 3,530 $336M
14 Stellar Industries, Inc. Employee Stock Ownership Plan ESOP 774 $331M
15 Winco Foods 401(k) Plan 401(k) 19,177 $290M
16 Woodgrain Millwork, Inc. Employee Savings Plan and Trust 401(k) 4,449 $272M
17 Norco, Inc. Employee Stock Ownership Plan ESOP 1,381 $269M
18 Amwtp Employee Investment Plan 401(k) 1,270 $265M
19 Lamb Weston, Inc. 401(k) Plan for Plant Hourly Employees 401(k) 5,541 $254M
20 Blue Cross of Idaho Health Service, Inc. 401(k) Plan 401(k) 1,504 $234M
21 Shaws Supermarkets, Inc. Pension Plan for Union Employees Defined Benefit (Pension) 5,378 $230M
22 Amalgamated Sugar Company Hourly Retirement Plan Defined Benefit (Pension) 878 $224M
23 Terteling Employees' Profit Sharing and Thrift Savings Plan 401(k) 1,343 $183M
24 Hecla Mining Company Capital Accumulation Plan 401(k) 747 $163M
25 Boise Cascade Company Hourly Savings Plan 401(k) 2,114 $146M

Nearby States by Retirement Plan Footprint

States ranked adjacent to Idaho by total retirement plan assets.

Compare Idaho side-by-side with 3 peer states →

Nationwide states with similar retirement plan scale

Two DOL Form 5500-derived peer sets for Idaho, each a different nationwide metric so the neighborhoods are not geographic containment (the asset-ranked nearby list above stays regional).

Similar plan count

Nearest other states by reported employer plan filings (760 here).

Arkansas 760 plans Nebraska 778 plans Nevada 808 plans New Hampshire 708 plans

Similar total assets

Nearest other states by aggregate plan assets ($31.4B here).

New Mexico $33.4B Maine $33.6B Hawaii $29.2B North Dakota $21.5B

Frequently Asked Questions

What is the largest retirement plan headquartered in Idaho? ▼
The largest Form 5500 filing by assets with a headquarters address in Idaho is Winco Employee Stock Ownership Plan ($5.0B, 17,054 participants).
How concentrated are Idaho retirement plan assets? ▼
Winco Employee Stock Ownership Plan alone accounts for about 16% of the state's Form 5500 plan assets in plan year 2024. State averages can mask that concentration.
Which industry leads Idaho retirement plan assets? ▼
Manufacturing leads with $9.1B across 98 plans headquartered here (29% of state plan assets).
How does Idaho compare to other states for retirement plans? ▼
Idaho sits mid-pack by plan assets (#40 of 56). Peer states with similar totals are the fairest comparison set; national leaders will dominate any unfiltered ranking.

Next read for Idaho

Concentration reading

Ways to act on Idaho's numbers.

Source: U.S. Department of Labor, EBSA Form 5500 public disclosure dataset. Shows the top 25 plans by total assets headquartered in Idaho, out of 130,145 ERISA-covered plans nationally. Plan year 2024.

Source: DOL EFAST2 filing system (efast.dol.gov) - state is the plan sponsor's headquarters state as recorded on the Form 5500 filing.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from U.S. Department of Labor Form 5500 filings (EBSA). See our methodology for details.