COSTCO WHOLESALE CORP /NEW 4

Executive Vice President Pierre Riel received 4,552 performance-based RSU shares of Costco common stock, with approximately 1,562 shares withheld for taxes, resulting in post-withholding ownership of about 14,246 shares.

On September 10, 2026, Costco Wholesale Corp. Executive Vice President Pierre Riel had performance-based restricted stock units convert into 4,552 shares of common stock following the Compensation Committee’s determination that fiscal 2026 performance conditions were met, increasing his direct holdings to approximately 15,808 shares. On the same date, a related transaction reported with code “F” reflects the withholding of about 1,562 shares to cover tax obligations at an implied price of roughly $902.38 per share, leaving Riel with direct ownership of about 14,246 shares after the tax withholding. These awards vest 20% on the first anniversary of the original October 22, 2025 grant date and 20% annually over the next four years, with potential accelerated vesting for long-service milestones under Costco’s 2019 Incentive Plan.

Filing Facts

CIK

909832

Ticker

COST

Form

4

Source Type

sec

Accession

0000909832-26-000076

Alert Tier

7