Costco Wholesale Corp: principal accounting officer Barbre Tiffany Marie received 1,965 shares

What happened

• Barbre Tiffany Marie, principal accounting officer, received a grant of 1,965 restricted stock units (RSUs) on Oct 22, 2026 at $0.00 per share (acquired value $0).
• The company withheld a total of 536.768 shares to cover taxes related to vesting; the withholding transactions were recorded at $1,018.21 per share and total $546,543 (individual withholdings: 90.23 shares for $91,873; 93.948 shares for $95,659; 101.536 shares for $103,385; 84.603 shares for $86,144; 166.451 shares for $169,482).

Key details

• Transaction date: Oct 22, 2026. Withholding price: $1,018.21 per share (closing Nasdaq price on Oct 22, 2026).
• Shares owned after the transaction: not reported in this filing.
• Footnotes: F1 describes RSU vesting (one-fifth vests on Oct 22, 2027 and one-fifth annually thereafter; eligible for accelerated vesting on the anniversary of the reporting person's 25th, 30th and 35th years of service). F3 states the share disposals were company tax withholdings and the price used was the closing market price on Oct 22, 2026. F2 notes the grant is an RSU grant.
• Filing date: Oct 26, 2026; transaction date: Oct 22, 2026 (timeliness not specified in the filing).

Why it may matter

• This Form 4 reports a grant of RSUs and company withholding of vested shares to satisfy tax obligations; it is not a market sale initiated by the reporting person in the open market.
• A filing does not show why the insider traded or why the company acted.