401(k) · DOL Form 5500 · 2022
Costco Wholesale Corporation 401(k) Plan
Data updated 2026-08-11
- $25.9B
- Total assets
- 181,505
- Participants
- 100th
- Percentile by assets
- $142,767
- Avg per participant
Official DOL plan name: Costco 401(k) Retirement Plan · Sponsored by Costco Wholesale Corporation · Washington · Retail Trade
$25.9B in assets, 181,505 participants
Costco Wholesale Corporation's Costco 401(k) Retirement Plan reported $25.9B in total assets and 181,505 participants in its 2022 DOL Form 5500 filing, ranking in the 100th 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.
- 100th percentile by assets (of 139,126 plans)
- #9,518 in Retail Trade (9,519 peers)
Coverage in Washington
Costco 401(k) Retirement Plan covers 181,505 participants in Washington, 123x the typical Washington plan (state average ~1,476 per filing). Assets: $25.9B.
- $25.9B
- total plan assets (2022 EOY)
- 181,505
- covered participants
- 100th
- percentile by assets (of 139,126 plans)
- $142,767
- avg assets per participant
The plan reported a net loss of $5.5B for the year, a single-year figure driven by markets and benefit payments, not a measure of plan health.
Participants vs Washington filers
In Washington, the average filing covers about 1,476 participants across 2,612 plans. Costco 401(k) Retirement Plan reports 181,505 participants - 123x that state average ($25.9B EOY assets).
Washington filing particulars
| Total Assets (Beginning of Year) | $31.4B |
|---|---|
| Net Assets (End of Year) | $25.9B |
| Net Income | -$5.5B |
| Employer EIN | 911223280 |
| Plan Effective Date | 1995-01-01 |
| Filing Status | FILING RECEIVED |
Sponsor Plan History (Costco Wholesale Corporation)
| Year | Plans | Participants | Total Assets |
|---|---|---|---|
| 2022 | 2 | 183,100 | $26.0B |
| 2023 | 2 | 194,292 | $33.5B |
| 2024 | 2 | 203,973 | $41.1B |
Nearby 401(k) Plans in Washington
Peer 401(k) plans, same state, same plan type, ranked by total assets.
Costco 401(k) Retirement Plan vs. nearby 401(k) plans in Washington, assets vs. participants
- The Boeing Company 401(k) Retirement Plan $63.5B · 118,434
- Microsoft Corporation Savings Plus 401(k) Plan $39.6B · 109,797
- Amazon 401(k) Plan $17.7B · 1,230,308
- T-Mobile USA, Inc. 401(k) Retirement Savings Plan & Trust $7.3B · 75,797
- 401(k) Savings Plan $5.9B · 95,581
Scale composition for Costco 401(k) Retirement Plan
Costco 401(k) Retirement Plan reports $25.9B in end-of-year assets across 181,505 participants (0.21% of the $12.3T held by all Form 5500 filers in the national rollup , and 0.19% of 93,925,755 covered participants) - about $142,767 per participant (1.0x the national average assets-per-participant) . Net income for plan year 2022 was -$5.5B.
This plan identity (EIN 911223280, plan #002) has 3 Form 5500 filings on file from 2022 to 2024 , with end-of-year assets moving from $25.9B to $41.0B (+58.3%) while covered participants moved from 181,505 to 202,468 . Single-year sparse filers cannot show that trail.
| Plan year | Participants | EOY assets | Filing |
|---|---|---|---|
| 2022 | 181,505 | $25.9B | This page |
| 2023 | 192,744 | $33.4B | Open filing |
| 2024 · index core | 202,468 | $41.0B | Open filing |
The same sponsor also keeps 2 other index-core plans on PlainRetire:
- Costco 401(k) Retirement Plan (401(k), $41.0B, 202,468 participants)
- Costco Puerto Rico Retirement Plan (401(k), $127M, 1,505 participants)
Similar-Sized 401(k) Plans Nationally
401(k) plans in other states closest to Costco 401(k) Retirement Plan by total assets, not by location.
- Verizon Savings Plan for Management Employees (NJ) $25.2B · 76,788
- GE Retirement Savings Plan (CT) $24.8B · 57,522
- CVS Health Future Fund 401(k) Plan (RI) $24.2B · 273,274
- Fidelity Retirement Savings Plan (MA) $23.0B · 52,036
Frequently Asked Questions
How did Costco 401(k) Retirement Plan assets move in 2022? ▼
How have Costco Wholesale Corporation plan assets changed over time? ▼
Where does Costco 401(k) Retirement Plan rank by assets among Form 5500 filers? ▼
Which 401(k) plans are similar in size to Costco 401(k) Retirement Plan? ▼
Next read for Costco 401(k) Retirement Plan
Filing takeaways
Ways to act on Costco 401(k) Retirement Plan's numbers.
- By total assets, Costco 401(k) Retirement Plan ranks among the largest 1% of all filed plans. See the largest plans
- Compare it side-by-side against 3 similar 401(k) plans in Washington. Compare plans
- Costco Wholesale Corporation's sponsor-wide assets have grown 58.3% since 2022 across 3 plan years on file. More Retail Trade plans