401(k) · DOL Form 5500 · 2022
Costco Wholesale Corporation 401(k) Plan
Data updated 2026-08-25
- $25.9B
- Total assets Mega-plan scale
- 181,505
- Participants Very large workforce
- 100th
- Percentile by assets National rank
- $142,767
- Avg per participant Near avg balance/head
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.
- #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.
- #9,518
- in Retail Trade (9,519 peers)
- -17.4%
- assets change YoY
- 260×
- vs typical plan assets (national mean)
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.
Costco 401(k) Retirement Plan's outsized position by total assets
Costco 401(k) Retirement Plan vs every filed plan by assets
End-of-year total assets · plan year 2022 · DOL Form 5500
$25,912,962,472 Highest reported value at or above every one of 139,123 filed plans
Dashed line + filled bar = this entry, among filed plans.
Source U.S. Department of Labor Form 5500 filings (EBSA) · plan year 2022
Costco 401(k) Retirement Plan's mega-plan peer group by participant headcount
Plan-year 2022 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Costco 401(k) Retirement Plan is a mega filing (181,505 participants), the rightmost band on the breakdown.
Form 5500 schedule snapshot
Filing strip 911223280 · Costco Wholesale Corporation PY 2022 · 401(k)
Costco 401(k) Retirement Plan · $25.9B · 181,505 · 100th
- BOOK $25.9B
- VS-ST 181,505
- BOY 100th
- SCH 401(k)
- EBSA near Verizon Savings Plan for Management Employees
- PART ind #9518
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 Retail Trade retirement plans → · Plans in Washington →
Costco 401(k) Retirement Plan in the asset neighbourhood
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)
Sponsor-wide plan assets over time
All Costco Wholesale Corporation plans reported in each filing year
- Latest sponsor-wide plan assets
- $41.1B 58.26330007602728% vs 2022
- 2024 filing year
| 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.
- 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)
Costco 401(k) Retirement Plan's out-of-state 401(k) peers by assets and headcount
Outside Washington, the nearest 401(k) by assets is Verizon Savings Plan for Management Employees in NJ ($25.2B); by covered participants it is Dollar General Corp 401(k) Savings and Retirement Plan in TN (185,609 participants). Same-state nearby plans are listed separately above.
Closest by plan assets
Nearest other-state filings by tot_assets_eoy ($25.9B here).
- 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
Similar participant headcount
Nearest other-state filings by covered participants (181,505 participants); asset peers above are excluded.
- Dollar General Corp 401(k) Savings and Retirement Plan (TN) 185,609 · 4,104 off
- Unitedhealth Group 401(k) Savings Plan (MN) 176,886 · 4,619 off
- Publix Super Markets, Inc. 401(k) Smart Plan (FL) 176,752 · 4,753 off
- Darden Savings Plan (FL) 176,132 · 5,373 off
DOL Form 5500 plan year 2022. Asset totals can differ widely at the same headcount; neither axis is a quality rating.