Company: COST
Filing Date: 2025-06-27
Form Type: 11-K
Source: 0000909832-25-000038
Chunk: 7

Company: COSTCO WHOLESALE CORP /NEW
Filing Date: 2025-06-27
Form: 11-K
Chunk 7
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 or, if for the purchase of a principal residence, up to 15 years. The bi-weekly re-payment amount cannot exceed 25% of the participant's net pay. The interest rate is determined by the Plan Administrator from time-to-time and is comparable to rates

<div align='center'>5</div>

#### COSTCO 401(k) RETIREMENT PLAN
<div align='center'>Notes to Financial Statements (Continued)

December 31, 2024 and 2023</div>

charged by commercial lenders. At December 31, 2024, interest rates on loans outstanding ranged from 4.25% to 10.50%, with various maturities through December 2039. Participant accounts with loans are charged an application fee at initiation and an annual maintenance fee.

(i)

#### Trustee, Recordkeeper, and Plan Administrator
Northern Trust Company is the nondiscretionary trustee of the Plan and T. Rowe Price Retirement Services Inc. is the recordkeeper for the Plan. The Costco Benefits Committee is the Plan Administrator.

(j) Administrative, Recordkeeping and Investment Fees and Expenses

Certain administrative expenses, and recordkeeping and investment fees including investment management and transaction fees, are paid by the Plan. Certain of those expenses are charged to participant accounts.

(2)

#### Summary of Significant Accounting Policies
(a)

#### Basis of Accounting
The financial statements of the Plan are prepared under the accrual method of accounting. As required under U.S. generally accepted accounting principles (U.S. GAAP), fully benefit-responsive investment contracts (FBRIC) are reported at contract value (see Note 3), while all other investments in the Plan are reported at fair value (see Note 4). A FBRIC is a contract with a financial institution or an insurance company that provides for a stated return on principal invested over a specified period and permits withdrawals at contract value for benefit payments, loans, or transfers to other investment options offered to the participant by the Plan. Contract value is the amount participants would receive if they were to initiate permitted transactions under the terms of the Plan.

(b)

#### Use of Estimates
The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ from those estimates and assumptions.

(c)

#### Investment Valuation and Income Recognition
The Plan invest