401(k) · DOL Form 5500 · 2023

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

Data updated 2026-08-25

$574M
Total assets Above avg plan size
2,158
Participants Near avg headcount
98th
Percentile by assets National rank
$265,906
Avg per participant High balance/head
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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

$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.

  • #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.

#8,812
in Construction (9,030 peers)
+21.4%
assets growth YoY
5.8×
vs typical plan assets (national mean)

Western Washington U.a. Supplemental Pension Plan's outsized position by total assets

Western Washington U.a. Supplemental Pension Plan vs every filed plan by assets

End-of-year total assets · plan year 2023 · DOL Form 5500

$573,824,074 Top 2% higher than 98% of 127,068 filed plans

This plan $0 $2,050,000,000 every filed plan with reported assets, bucketed by value

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

Source U.S. Department of Labor Form 5500 filings (EBSA) · plan year 2023

Western Washington U.a. Supplemental Pension Plan's large-plan peer group by participant headcount

Plan-year 2023 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Western Washington U.a. Supplemental Pension Plan lands in the large band (2,158 participants).

What changed between DOL Form 5500 filings

plan year 2022 → plan year 2023

  • 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 2022→2023 release diff →

EBSA filing schedule strip

Filing strip 911879397 · Board of Trustees of the Western Wa U.a. Supplemental Pension Plan PY 2023 · 401(k)

Western Washington U.a. Supplemental Pension Plan · $574M · 2,158 · 98th

  • NET $574M
  • NET 2,158
  • NET 98th
  • NET 401(k)
  • NET near Endeavor 401(k) Plan
  • NET ind #8812

Stamps derive from this plan's Form 5500 line items (assets, participants, type, EIN, cohort placement) - not a quality rating of the sponsor. Read with Construction retirement plans → · Plans in Washington →

Western Washington U.a. Supplemental Pension Plan in the asset neighbourhood

Phoenix Children's Hospital Section 401(k) Investment PlanPhoenix Children's Hospital …$574MAsbury Automotive Retirement Savings PlanAsbury Automotive Retirement…$574MWestern Washington U.a. Supplemental Pension PlanWestern Washington U.a. Supp…$574MEndeavor 401(k) Plan$574MFish & Richardson Profit Sharing 401(k) PlanFish & Richardson Profit Sha…$573M
End-of-year total assets ($M) among Western Washington U.a. Supplemental Pension Plan and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2023.

Scale-class filing particulars (2023)

Total Assets (Beginning of Year)$472M
Net Assets (End of Year)$573M
Net Income$100M
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)

Sponsor-wide plan assets over time

All Board of Trustees of the Western Wa U.a. Supplemental Pension Plan plans reported in each filing year

Latest sponsor-wide plan assets
$661M 39.92336217242783% vs 2022
2024 filing year
$400M$500M$600M$700M 202220232024 $472M $661M ▲ +39.9%
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 Scatter plot of 6 data points. -50000050000100000150000200000250000 -20020406080 Total assets ($B) Participants Western Washington U.a. Supplemental Pension Plan, Total assets ($B): 0.573824074 · Participants: 2158Western Washington U.a. Supplemental Pension PlanThe Boeing Company 401(k) Retirement Plan, Total assets ($B): 72.246135158 · Participants: 128910The Boeing Company 401(k) Retirement PlanMicrosoft Corporation Savings Plus 401(k) Plan, Total assets ($B): 53.225853429 · Participants: 123296Microsoft Corporation Savings Plus 401(k) PlanCostco 401(k) Retirement Plan, Total assets ($B): 33.384845813 · Participants: 192744Costco 401(k) Retirement PlanT-Mobile USA, Inc. 401(k) Retirement Savings Plan & Trust, Total assets ($B): 8.338937292 · Participants: 71538T-Mobile USA, Inc. 401(k) Retirement Savings Plan & Trust401(k) Savings Plan, Total assets ($B): 8.118808679 · Participants: 87590401(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 Pension Plan side-by-side with 3 peers →

Western Washington U.a. Supplemental Pension Plan's out-of-state 401(k) peers by assets and headcount

Outside Washington, the nearest 401(k) by assets is Endeavor 401(k) Plan in CA ($574M); by covered participants it is Team Lyders Retirement Plan in MI (2,158 participants). Same-state nearby plans are listed separately above.

Closest by plan assets

Nearest other-state filings by tot_assets_eoy ($574M here).

Similar participant headcount

Nearest other-state filings by covered participants (2,158 participants); asset peers above are excluded.

DOL Form 5500 plan year 2023. Asset totals can differ widely at the same headcount; neither axis is a quality rating.

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).
Which 401(k) plans cover a similar participant headcount to Western Washington U.a. Supplemental Pension Plan? ▼
Among 401(k) plans in other states, the closest by covered participants is Team Lyders Retirement Plan in MI (2,158 participants, $5M in assets).

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.

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.