401(k) · DOL Form 5500 · 2023

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

Data updated 2026-08-11

$574M
Total assets: 2,158
Participants: 98th
Percentile by assets: $265,906
Avg per participant

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

$574M in assets, 2,158 participants

Board of Trustees of the Western Wa U.a. Supplemental Pension Plan's Western Washington U.a. Supplemental Pension Plan reported $574M in total assets and 2,158 participants in its 2023 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 127,072 plans)
#8,812 in Construction (9,030 peers)

Where Western Washington U.a. Supplemental Pension Plan sits by assets

Western Washington U.a. Supplemental Pension Plan sits in the top 5% of all filed plans by assets, $574M for 2,158 participants (~$265,906/participant), up 21.4% in 2023.

$574M
total plan assets (2023 EOY): 2,158
covered participants: 98th
percentile by assets (of 127,072 plans): $265,906
avg assets per participant

Western Washington U.a. Supplemental Pension Plan reported net income rose from -$84M in the plan year 2022 filing to $100M in the plan year 2023 filing.
Western Washington U.a. Supplemental Pension Plan reported participants fell from 5,114 in the plan year 2022 filing to 2,158 in the plan year 2023 filing.
Western Washington U.a. Supplemental Pension Plan end-of-year assets rose from $472M in the plan year 2022 filing to $574M in the plan year 2023 filing.

See the national 2023→2024 release diff →

State

Washington

Industry

Construction

Western Washington U.a. Supplemental Pension Plan vs the 2023 asset distribution

By assets, Western Washington U.a. Supplemental Pension Plan outranks 98% of the 127,072 plans that filed a Form 5500 for the 2023 plan year, and holds roughly 5.8x the national average plan size of $100M (721 average participants).

Scale-class filing particulars (2023)

Total Assets (Beginning of Year)	$472M
Net Assets (End of Year)	$573M
Net Income	$100M
Employer EIN	911879397
Plan Effective Date	1998-01-01
Filing Status	FILING RECEIVED

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

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

The Boeing Company 401(k) Retirement Plan $72.2B · 128,910
Microsoft Corporation Savings Plus 401(k) Plan $53.2B · 123,296
Costco 401(k) Retirement Plan $33.4B · 192,744
T-Mobile USA, Inc. 401(k) Retirement Savings Plan & Trust $8.3B · 71,538
401(k) Savings Plan $8.1B · 87,590

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.

Endeavor 401(k) Plan (CA) $574M · 5,826
Asbury Automotive Retirement Savings Plan (GA) $574M · 8,171
Fish & Richardson Profit Sharing 401(k) Plan (MN) $573M · 1,033
Phoenix Children's Hospital Section 401(k) Investment Plan (AZ) $574M · 6,560

Frequently Asked Questions

How did Western Washington U.a. Supplemental Pension Plan assets move in 2023? ▼

Western Washington U.a. Supplemental Pension Plan grew sharply - up 21.4% during 2023, from $472M to $574M. Reported net income was $100M.

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 127,072 plans that reported assets for plan year 2023 (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 Endeavor 401(k) Plan in CA ($574M, 5,826 participants).

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

Scale reading

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 2023.

Source: DOL EFAST2 filing system (efast.dol.gov) - original filing retrieval by EIN 911879397.