Form4.ai tracks every SEC insider trade in real time. See every COST insider filing with a free account — no card.
See every COST insider filing — free account, no card.
Free accountCOSTCO WHOLESALE CORP (COST) has 28 SEC Form 4 insider filings on record in the last 90 days. No insider purchases were filed — 3 sales totalling $3.8M. Most recent filing: Oct. 27, 2026.
Open-market value, last 90 days
Form 4 filings by type, last 90 days
| Date | Insider | Trade | Value | Price since buy |
|---|---|---|---|---|
| Oct 27, 2026 SEC filing | Sullivan John Christopher Executive VP | Vest & sell-to-cover | +789 sh | — |
| Oct 27, 2026 SEC filing | Self Adam Webb Executive Vice President | Tax withholding | $264,497 | — |
| Oct 27, 2026 SEC filing | POLIT JAVIER Executive Vice President | Vest & sell-to-cover | +2,557 sh | — |
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Form 4 is the filing company officers, directors and 10% shareholders must submit to the SEC within two business days of trading their own company's stock. Open-market purchases generally carry more signal than sales, which are often scheduled in advance. More on how this works.