401(k) · DOL Form 5500 · 2024

Board of Trustees of the Western Wa U.a. Supplemental Pension Plan 401(k) Plan

Data updated 2026-08-11

$661M
Total assets
4,342
Participants
98th
Percentile by assets
$152,262
Avg per participant
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Official DOL plan name: Western Washington U.a. Supplemental Pension Plan · Sponsored by Board of Trustees of the Western Wa U.a. Supplemental Pension Plan · Washington · Construction

$661M in assets, 4,342 participants

Board of Trustees of the Western Wa U.a. Supplemental Pension Plan's Western Washington U.a. Supplemental Pension Plan reported $661M in total assets and 4,342 participants in its 2024 DOL Form 5500 filing, ranking in the 98th 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.

  • 98th percentile by assets (of 123,622 plans)
  • #8,828 in Construction (9,039 peers)

Coverage in Washington

Western Washington U.a. Supplemental Pension Plan covers 4,342 participants in Washington, 2.9x the typical Washington plan (state average ~1,476 per filing). Assets: $661M.

$661M
total plan assets (2024 EOY)
4,342
covered participants
98th
percentile by assets (of 123,622 plans)
$152,262
avg assets per participant

What changed between DOL Form 5500 filings

plan year 2023 → plan year 2024

  • Western Washington U.a. Supplemental Pension Plan reported participants rose from 2,158 in the plan year 2023 filing to 4,342 in the plan year 2024 filing.
  • Western Washington U.a. Supplemental Pension Plan end-of-year assets rose from $574M in the plan year 2023 filing to $661M in the plan year 2024 filing.
  • Western Washington U.a. Supplemental Pension Plan reported net income fell from $100M in the plan year 2023 filing to $88M in the plan year 2024 filing.

See the national 2023→2024 release diff →

State
Washington
Industry
Construction

Participants vs Washington filers

In Washington, the average filing covers about 1,476 participants across 2,612 plans. Western Washington U.a. Supplemental Pension Plan reports 4,342 participants - 2.9x that state average ($661M EOY assets).

Washington filing particulars

Total Assets (Beginning of Year)$574M
Net Assets (End of Year)$661M
Net Income$88M
Employer EIN911879397
Plan Effective Date1998-01-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Board of Trustees of the Western Wa U.a. Supplemental Pension Plan)

$400M$500M$600M$700M 202220232024 $472M $661M ▲ +39.9%
Total plan assets by year, all Board of Trustees of the Western Wa U.a. Supplemental Pension Plan plans on file
Year Plans Participants Total Assets
2022 1 5,114 $472M
2023 1 2,158 $574M
2024 1 4,342 $661M

Nearby 401(k) Plans in Washington

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

Western Washington U.a. Supplemental Pension Plan vs. nearby 401(k) plans in Washington, assets vs. participants

Western Washington U.a. Supplemental Pension Plan vs. nearby 401(k) plans in Washington, assets vs. participants Scatter plot of 6 data points. -500000050000010000001500000 -20020406080 Total assets ($B) Participants Western Washington U…The Boeing Company 4…Microsoft Corporatio…Costco 401(k) Retire…Amazon 401(k) Plan401(k) Savings Plan
Western Washington U.a. Supplemental Pension Plan vs. nearby 401(k) plans in Washington, assets vs. participants
Compare Western Washington U.a. Supplemental Pen… side-by-side with 3 peers →

Similar-Sized 401(k) Plans Nationally

401(k) plans in other states closest to Western Washington U.a. Supplemental Pension Plan by total assets, not by location.

Frequently Asked Questions

How did Western Washington U.a. Supplemental Pension Plan assets move in 2024? ▼
Western Washington U.a. Supplemental Pension Plan grew sharply - up 15.2% during 2024, from $574M to $661M. Reported net income was $88M.
How have Board of Trustees of the Western Wa U.a. Supplemental Pension Plan plan assets changed over time? ▼
Across 3 plan years on file (2022-2024), Board of Trustees of the Western Wa U.a. Supplemental Pension Plan's sponsor-wide assets grew 39.9%, from $472M to $661M.
Where does Western Washington U.a. Supplemental Pension Plan rank by assets among Form 5500 filers? ▼
Western Washington U.a. Supplemental Pension Plan ranks in the 98th 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 Western Washington U.a. Supplemental Pension Plan? ▼
Among 401(k) plans in other states, the closest by assets is Bj's Wholesale Club, Inc. 401(k) Savings Plan in MA ($661M, 31,034 participants).

Next read for Western Washington U.a. Supplemental Pen…

Filing takeaways

Ways to act on Western Washington U.a. Supplemental Pension Plan's numbers.

  • By total assets, Western Washington U.a. Supplemental Pension 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 Washington. Compare plans
  • Board of Trustees of the Western Wa U.a. Supplemental Pension Plan's sponsor-wide assets have grown 39.9% since 2022 across 3 plan years on file. More Construction 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 911879397.

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.