Washington 401(k) plans

Name: Washington 401(k) plans: assets, participants and plan-paid fees
Creator: 401(k) Monitor
License: https://401kmonitor.com/licence/

1,267

Large 401(k) plans headquartered in Washington are in 401(k) Monitor’s published set, holding $341.1B in total, led on headcount by Amazon 401(k) Plan with 1,207,759 active participants. Computed from DOL Form 5500 filings, plan years 2021–2025.

State means the sponsor’s address on the filing, not where employees work. The figures above read all 1,267 of the form-year-2024 DOL EFAST2 filings from Washington, so they are every plan of that size filed from the state; 41 of them have a page of their own here. A plan with fewer than 100 participants files a shorter form and is not in this data at all.

31 of the biggest 401(k) plans headquartered in Washington

The plans this site submits to search engines come first, then the rest of the ones with a page; each group is ranked by active participants, the people still building up a balance. plan years 2021–2025, DOL EFAST2 bulk data. Assets in USD. Every row links to its full fact page.
#	Plan	City	Active participants	Assets
1	Amazon 401(k) Plan	Seattle	1,207,759	$34.6B
2	Starbucks Corporation 401(k) Plan	Seattle	220,791	$4.9B
3	Costco 401(k) Retirement Plan	Issaquah	212,976	$41.0B
4	The Boeing Company 401(k) Retirement Plan	Seattle	143,146	$73.9B
5	Microsoft Corporation Savings Plus 401(k) Plan	Redmond	123,878	$65.6B
6	401(k) Savings Plan	Renton	88,899	$10.1B
7	T-Mobile USA, Inc. 401(k) Retirement Savings Plan & Trust	Bellevue	69,015	$9.1B
8	Nordstrom 401(k) Plan	Seattle	58,257	$4.3B
9	Providence Health & Services 403(b) Value Plan	Renton	39,977	$6.5B
10	Recreational Equipment, Inc. Retirement And Profit Sharing Plan	Sumner	13,880	$1.0B
11	Blue 401(k) Plan	Kent	13,293	$1.2B
12	Savers 401(k) Plan	Bellevue	12,141	$127.7M
13	Paccar Inc. Savings Investment Plan	Bellevue	10,793	$2.9B
14	Seattle Children's Healthcare System Employees Retirement Plan	Seattle	10,359	$1.5B
15	Fortive Retirement Savings Plan	Everett	9,525	$2.1B
16	Anchor Point Management Group Employee Benefit Plan	Vancouver	9,415	$22.4M
17	Multicare Health System 401(k) Plan	Tacoma	9,028	$779.1M
18	Slalom 401(k) Plan	Seattle	8,341	$1.6B
19	Puget Sound Electrical Workers 401(k) Savings Plan	Seattle	7,974	$622.3M
20	Weyerhaeuser 401(k) Plan	Seattle	7,901	$2.4B
21	Expedia Retirement Savings Plan	Seattle	7,584	$1.8B
22	Trueblue, Inc. 401(k) Plan	Tacoma	6,935	$95.6M
23	Alaska Airlines, Inc. Flight Attendant 401(k) Plan	Seattle	6,931	$1.0B
24	Alaska Airlines, Inc. Cops, Mrp & Dispatch 401(k) Plan	Seattle	6,810	$928.7M
25	Ro Health 401(k) Plan	Seattle	6,526	$7.5M
26	Zillow Group 401(k) Plan	Seattle	6,441	$849.8M
27	Expeditors International Of Washington, Inc. 401(k) Plan	Seattle	6,417	$1.2B
28	Saltchuk Companies 401(k) Plan	Seattle	6,166	$669.8M
29	Eastern Washington-Northern Idaho Carpenters 401(k) Retirement Plan	Spokane	5,030	$53.3M
30	Sanmar, Lkwp, And Affiliates 401(k) Plan	Issaquah	5,003	$204.3M
31	Umpqua Bank 401(k) And Profit Sharing Plan	Tacoma	4,695	$761.3M

Every Washington plan page, by size

The table above is the top of the list. These 4 pages hold the 41 published plan pages from Washington, out of 1,267 filings of that kind in the data, split by how many people are in them, each ranked by active participants.

401(k) fees in Washington vs the national median

Plan-paid administrative cost per participant, plan years 2021–2025 Form 5500 filings. Computed over every large plan filed from Washington, whether or not it has a page here. The medians read only the ones whose filing reports a plan-paid cost.
Washington medianAcross the 1,203 Washington plans in our set with usable fee data.	$128.90 per participant
National medianAcross 54,782 published plans with usable fee data.	$122.17 per participant
Difference	$6.73 above the national median

Plan-paid means fees the plan itself reports on Schedule H; many employers pay providers directly, which a filing reports as $0. How to judge your own plan: are your 401(k) fees high?

Washington employers with a match dossier

These Washington-headquartered plans also file an SEC Form 11-K, so the employer’s match formula, vesting and eligibility are extracted on a company page.

AVISTA CORP 401(k) match
Investment & Employee Stock Ownership Plan Of Avista
Expedia Group, Inc. 401(k) match
Expedia Retirement Savings Plan
Microsoft Corporation 401(k) match
Microsoft Corporation Savings Plus 401(k) Plan
PACCAR Inc 401(k) match
Paccar Inc. Savings Investment Plan
The Boeing Company 401(k) match
The Boeing Company 401(k) Retirement Plan

Useful links

All states
Plan counts, fees and largest plans, state by state.
The largest 401(k) plans in the US
The national ranking these state tables are drawn from.
Average 401(k) fees by plan size
Fees depend on plan size more than on state.

Cite: 401(k) Monitor, “Washington 401(k) plans: largest plans and fees”, computed from DOL EFAST2 Form 5500 bulk data, plan years 2021–2025, published set of 57,824 plans, data as of July 28, 2026.