Costco Wholesale Corporation
Overview
Costco Wholesale Corporation sponsors a self-funded health plan that covered 13,254 participants in plan year 2025, up 9% from the prior year. The plan year starts in September. Alongside medical, its benefits filing reports dental, vision, short-term disability, death benefits.
- Plan type
- ERISA welfare benefit plan, self-funded (benefits paid from employer assets or a trust)
- Participants
- 13,254 · prior year 12,158
- Plan year
- Begins September 1 · next renewal September 2027
- Health plans filed
- Costco Wholesale Corporation Texas Injury Benefit Plan, plan 513 (13,254 participants)
Pharmacy benefit estimate
StreamRX estimate for a plan this size. Not based on this plan's claims.
Estimated prescription spend: 13,254 participants × $2,371 national average per member. Usually higher once dependents are counted.
Typical savings opportunity found in independent reviews of plans this size.
Form 5500 filing details
- Filing
- Form 5500 with Schedule A, plan year 2025
- Plan sponsor
- Costco Wholesale Corporation
- Sponsor EIN
- 91-1223280
- Plan number
- 513
- Filed with
- U.S. Department of Labor (EBSA) via EFAST2
Verify this filing: search EIN 91-1223280 in the Department of Labor's EFAST2 Form 5500 search.
Retirement plan
- Plan
- Costco 401k Retirement Plan
- Type
- 401(k) plan
- Participants
- 279,798
About this data
Source: Costco Wholesale Corporation's Form 5500 filing for plan year 2025 and its Schedule A insurance reports, published by the U.S. Department of Labor. "Self-funded" means the filing reports benefits paid from employer assets or a trust, with no medical insurance contract or with a stop-loss contract. Pharmacy figures are StreamRX estimates based on national averages. StreamRX is not affiliated with Costco Wholesale Corporation.