Costco Wholesale Corporation, Issaquah, WA. EIN 91-1223280. Annual reports 2009–2025.
Costco Wholesale Corporation has 2 active retirement plans on file. The largest is the Costco 401K Retirement Plan, with 279,798 participants and $41.5 billion in assets in 2025. T. Rowe Price has been its recordkeeper since 2012. No traditional pension plan appears in Costco Wholesale's filings since 2009.
Costco Wholesale Corporation 999 Lake Drive Issaquah, WA 98027 (425) 313-8100As filed for 2025
In effect since
December 1, 2001
Earlier plan names: Costco 1165E Plan.
Year by year, 2009 to 2025
Plan year
Participants
Net assets
Recordkeeper
2025
1,490
$154 million
T. Rowe Price
2024
1,473
$127 million
T. Rowe Price
2023
1,624
$107 million
T. Rowe Price
2022
1,661
$84.6 million
T. Rowe Price
2021
1,697
$104 million
T. Rowe Price
2020
1,585
$85.5 million
T. Rowe Price
2019
1,377
$75.4 million
T. Rowe Price
2018
1,377
$57.2 million
T. Rowe Price
2017
1,184
$58.5 million
not listed
2016
1,154
$46.2 million
T. Rowe Price
2015
1,210
$39.1 million
T. Rowe Price
2014
1,091
$35.0 million
T. Rowe Price
2013
1,026
$29.9 million
T. Rowe Price
2012
1,003
$22.2 million
T. Rowe Price
2011
1,006
$17.5 million
not listed
2010
981
$15.6 million
not listed
2009
960
$11.8 million
not listed
If you had money in one of these plans
Call T. Rowe Price (troweprice.com), which runs the Costco 401K Retirement Plan. With your Social Security number and the plan name, it can tell you whether you still have a balance and, if not, where it went.
Or call the plan administrator listed on the plan below ((425) 313-8100). That number was filed for 2025; ask for the benefits or retirement plan office.
Still stuck? The Department of Labor's benefits advisers help for free: askebsa.dol.gov or 1-866-444-3272. Never pay anyone to find your own money.
What these numbers are
They come from the Form 5500 annual reports each plan files with the Department of Labor, as the plan filed them. A plan year is usually a calendar year.
Participants counts everyone in the plan at year end: current employees, former employees who still have a balance or a pension coming, and retirees or beneficiaries being paid.
The recordkeeper is the service provider whose Schedule C entry says it keeps the plan's records. Small plans do not file Schedule C, so some plans show none.
We cannot see anyone's account. Only the plan or its recordkeeper can tell you your balance.