# Costco (COST) insider trading and SEC filings

Sep 30 Form 4: Caton Frates (officer) filed an open-market sale of 800 COST shares at $915.93. 8 filings shown from 7 insiders.

I read the 8 insider filings below, filed between Sep 14 and Sep 30, 2026, all on Form 4. Each one is about Costco stock and links to the original on EDGAR. They name 7 insiders: 7 officers. Of the filings, 2 report an open-market sale, 6 shares withheld for tax, and 6 a grant or award (some filings report more than one type). None of the 2 filings reporting a sale also reports an option exercise by the same person on the same trade date. Costco's SEC record shows its latest 10-K filed Oct 8, 2025, its latest 10-Q Jun 3, 2026, and its latest 8-K Sep 24, 2026.

| Form | Filed | Insider | Transaction | Price | Trade date | Shares held after | Ownership |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 4 | 2026-09-30 | Caton Frates — Sr. Executive Vice President | Open-market sale · 800 shares | $915.93 | Sep 29, 2026 | 7,912 | Direct |
| 4 | 2026-09-30 | Claudine Adamo — Executive Vice President | Open-market sale · 2,200 shares | $915.93 | Sep 29, 2026 | 7,133 | Direct |
| 4 | 2026-09-14 | Wilcox William Richard — Executive Vice President | Grant or award · 4,129 shares | — | Sep 10, 2026 | 6,129 | Direct |
| 4 | 2026-09-14 | Wilcox William Richard — Executive Vice President | Shares withheld for tax or exercise cost · 1,934 shares | $902.38 | Sep 10, 2026 | 4,194 | Direct |
| 4 | 2026-09-14 | Yoram Rubanenko — Executive Vice President | Grant or award · 4,129 shares | — | Sep 10, 2026 | 12,376 | Direct |
| 4 | 2026-09-14 | Yoram Rubanenko — Executive Vice President | Shares withheld for tax or exercise cost · 1,695 shares | $902.38 | Sep 10, 2026 | 10,680 | Direct |
| 4 | 2026-09-14 | Pierre Riel — Executive Vice President | Grant or award · 4,552 shares | — | Sep 10, 2026 | 15,807 | Direct |
| 4 | 2026-09-14 | Pierre Riel — Executive Vice President | Shares withheld for tax or exercise cost · 1,561 shares | $902.38 | Sep 10, 2026 | 14,246 | Direct |
| 4 | 2026-09-14 | Klauer James C — Executive Vice President | Grant or award · 4,129 shares | — | Sep 10, 2026 | 48,965 | Direct |
| 4 | 2026-09-14 | Klauer James C — Executive Vice President | Shares withheld for tax or exercise cost · 936 shares | $902.38 | Sep 10, 2026 | 48,029 | Direct |
| 4 | 2026-09-14 | Jones Teresa A. — Executive Vice President | Grant or award · 4,129 shares | — | Sep 10, 2026 | 8,056 | Direct |
| 4 | 2026-09-14 | Jones Teresa A. — Executive Vice President | Shares withheld for tax or exercise cost · 1,458 shares | $902.38 | Sep 10, 2026 | 6,598 | Direct |
| 4 | 2026-09-14 | Caton Frates — Executive Vice President | Grant or award · 4,552 shares | — | Sep 10, 2026 | 10,367 | Direct |
| 4 | 2026-09-14 | Caton Frates — Executive Vice President | Shares withheld for tax or exercise cost · 1,654 shares | $902.38 | Sep 10, 2026 | 8,712 | Direct |

Source: [https://pipthebot.com/insider/cost/](https://pipthebot.com/insider/cost/)

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