Employer · plans filed under one EIN
Costco Wholesale Corporation
Issaquah, WA · Retail trade
Form 5500 information is as filed by the plan administrator with the Department of Labor and may be amended. Figures reflect the plan year shown, not current balances.
2 retirement plans with 100 or more participants file Form 5500 under Costco Wholesale Corporation's employer identification number (Issaquah, Washington). Their latest filings total 281,288 participant records and $41.7B in net assets.
The largest is Costco 401(k) Retirement Plan, an ESOP with a 401(k) feature with 279,798 participants. A person can be counted in more than one plan, so the participant total is a count of records rather than of people.
Employer contributions across the plans were $765M and participant contributions $1.20B in the latest plan years; benefits paid were $3.40B. Schedule C compensation reported to service provider organisations totalled $5.7M.
Combined net assets moved from $4.18B in 2009 to $41.7B in 2025 (up 897%). Plan mergers and spin-offs show up here as steps in the series.
Plans
| Plan | Kind | Plan year | Participants | Net assets | Per participant | Employer / active | Sch. C compensation |
|---|---|---|---|---|---|---|---|
| Costco 401(k) Retirement Plan | ESOP with a 401(k) feature | 2025 | 279,798 | $41.5B | $148,406 | $3,384 | $5.6M |
| Costco Puerto Rico Retirement Plan | 401(k) plan | 2025 | 1,490 | $154M | $103,374 | $4,196 | $42K |
| US median, plan year 2024: DC plans $53,102 per participant, $2,175 employer contribution per active participant; DB plans $86,221 and $10,244. | |||||||
Trend by plan year
| Plan year | Plans | Participant records | Net assets | Employer contributions | Participant contributions |
|---|---|---|---|---|---|
| 2025 | 2 | 281,288 | $41.7B | $765M | $1.20B |
| 2024 | 2 | 265,372 | $41.1B | $686M | $1.10B |
| 2023 | 2 | 247,392 | $33.5B | $650M | $1.02B |
| 2022 | 2 | 241,016 | $26.0B | $584M | $940M |
| 2021 | 2 | 222,538 | $31.5B | $523M | $869M |
| 2020 | 2 | 207,903 | $24.3B | $493M | $754M |
| 2019 | 2 | 185,408 | $20.6B | $445M | $645M |
| 2018 | 2 | 175,780 | $15.5B | $413M | $617M |
| 2017 | 2 | 166,381 | $14.9B | $388M | $522M |
| 2016 | 2 | 156,200 | $12.2B | $361M | $479M |
| 2015 | 2 | 148,006 | $11.4B | $334M | $440M |
| 2014 | 2 | 138,193 | $10.2B | $315M | $407M |
| 2013 | 2 | 129,423 | $8.84B | $293M | $367M |
| 2012 | 2 | 122,768 | $7.10B | $280M | $338M |
| 2011 | 2 | 116,144 | $5.82B | $258M | $301M |
| 2010 | 2 | 110,873 | $5.22B | $241M | $274M |
| 2009 | 2 | 111,760 | $4.18B | $223M | $247M |
History of the plans listed above, in the years each filed the full Form 5500 with 100 or more participants. Plans that have since terminated are not included.
Service providers
| Organisation | Services reported | Plans | Compensation reported |
|---|---|---|---|
| T Rowe Price RPS Inc. | Recordkeeping and information management; Trustee (bank, trust company, or similar financial institution); Trustee (directed); Investment management | 2 | $5,417,976 |
| Mondress Monaco Parr Lockwood PLLC | Consulting (general) | 1 | $253,163 |
Organisations paid $5,000 or more by any of these plans, from Schedule C. Individuals are not shown.
Questions and answers
How many retirement plans does Costco Wholesale Corporation have?
2 plans with 100 or more participants filed Form 5500 under its employer identification number for the latest plan years: Costco 401(k) Retirement Plan and Costco Puerto Rico Retirement Plan. Smaller plans and plans filed under a subsidiary's number are not grouped here.
How much does Costco Wholesale Corporation contribute to its plans?
$764,664,258 in employer contributions across these plans in their latest plan years, about $3,388 per active participant record. Form 5500 reports totals and not the match or accrual formula.
Who provides services to these plans?
Schedule C filings name T Rowe Price RPS Inc. and Mondress Monaco Parr Lockwood PLLC. Only organisations paid $5,000 or more by a plan are listed on Schedule C.
Where does this come from?
Form 5500 annual reports filed with the Department of Labor's EFAST2 system, from the EBSA research files, with filings received through 24 Aug 2026. Figures are as filed and may be amended.
Provenance
Source: U.S. Department of Labor, Employee Benefits Security Administration, Form 5500 research files, public domain, with filings received through 24 Aug 2026. Plans are grouped by the sponsor's employer identification number exactly as filed; a company that files under several EINs appears as several employers. See the methodology and corrections.