COSTCO WHOLESALE CORP /NEW (COST) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-06-23 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: COSTCO WHOLESALE CORP /NEW (COST) CIK: 0000909832 --- Reporting Owner --- Name: DENMAN KENNETH D CIK: 0001254779 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-06-23 | Code: S (Open market sale) Shares: -885 | Price: $957.45 Total Value: $847,345.46 Shares Owned After: 4,778.936 | Ownership: D (Direct) Footnotes: [F1] The price shown is a weighted average price for shares sold in multiple transactions; the sale prices ranged from $957.44 to $957.63 per share. The reporting person will provide the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range. --- Footnotes (Complete Index) --- F1: The price shown is a weighted average price for shares sold in multiple transactions; the sale prices ranged from $957.44 to $957.63 per share. The reporting person will provide the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range. --- Signature --- /s/ /s/ Alejandro Torres, Attorney-in-Fact (2026-06-25)