Updated Jul 16, 2026 · Last SEC filing 2026-07-14
COSTCO WHOLESALE CORP /NEW (COST) has filed 2 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-07-14. 2 Form 8-K material event filings were reported by COST in the last 90 days. 3 Form 144 notices of proposed sale were filed for COST stock. InsiderAlpha tracks every COST SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SIC classification | Retail-Variety Stores (SIC 5331) |
|---|---|
| SEC CIK | 0000909832 |
| Form 4 filings (90d) | 2 |
|---|---|
| Form 8-K filings (90d) | 2 |
| Form 144 notices (90d) | 3 |
| Latest Form 4 filing | 2026-07-14 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| RAIKES JEFFREY S | Director | G — Bona-fide gift | 5.2K | $0.00 | — | SEC | |
| DENMAN KENNETH D | Director | S — Open-market sale | 885 | $957.45 | $847K | SEC | |
| Frates Caton | Executive Vice President | S — Open-market sale | 700 | $993.00 | $695K | SEC | |
| George Sarah Catherine | Executive Vice President | J — Other acquisition / disposition | 642 | $991.21 | $636K | SEC | |
| MILLERCHIP GARY | Executive Vice President | F — Tax withholding / forfeiture | 1.2K | $992.23 | $1.15M | SEC | |
| Adamo Claudine | Executive Vice President | S — Open-market sale | 730 | $1,003.02 | $732K | SEC | |
| RAIKES JEFFREY S | Director | G — Bona-fide gift | 5.1K | $0.00 | — | SEC | |
| Jones Teresa A. | Executive Vice President | G — Bona-fide gift | 300 | $0.00 | — | SEC | |
| DECKER SUSAN L | Director | S — Open-market sale | 458 | $955.00 | $437K | SEC | |
| Raimondo Gina Marie | Director | A — Grant or award | 215 | $0.00 | — | SEC | |
| Klauer James C | Executive Vice President | S — Open-market sale | 1.5K | $939.00 | $1.41M | SEC | |
| Miller Russell D | Sr. Executive Vice President | S — Open-market sale | 1.5K | $916.32 | $1.37M | SEC | |
| POLIT JAVIER | Executive Vice President | S — Open-market sale | 558 | $862.89 | $482K | SEC | |
| POLIT JAVIER | Executive Vice President | S — Open-market sale | 2.0K | $867.21 | $1.78M | SEC | |
| DENMAN KENNETH D | Director | G — Bona-fide gift | 325 | $0.00 | — | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for COSTCO WHOLESALE CORP /NEW (COST). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| RAIKES JEFFREY S | 1 | — |
| DENMAN KENNETH D | 1 | $847K |
Form 144 must be filed before insiders sell restricted or control stock above SEC thresholds. A cluster of Form 144 notices often precedes a wave of insider distribution.
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in COST insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
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