COSTCostco
Costco Wholesale Corporation and its subsidiaries (Costco or the Company) began operations in 1983, in Seattle, Washington. 10-K, Item 1
- Employees
- 355,000
- Headquarters
- Issaquah, WA
- CEO
- Roland Michael Vachris
- Next results
- around Dec 10, 2026
Every trade in COST shares that directors, officers and 10% owners reported on Form 4 since May 14, 2026. Open-market buys and sales are the trades the insider chose to make; grants, option exercises and shares withheld for tax are part of pay.
| Date | Insider | Role | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| Oct 13, 2026 | William Richard Wilcox | Executive Vice President | Sale | -1,100 | 958.21 | 1.1M | 3,094 |
| Sep 29, 2026 | Claudine Adamo | Executive Vice President | Sale | -2,200 | 915.93 | 2.0M | 7,134 |
| Sep 29, 2026 | Caton Frates | Sr. Executive Vice President | Sale | -801 | 915.93 | 733K | 7,912 |
| Jun 23, 2026 | Kenneth D. Denman | Director | Sale | -885 | 957.45 | 847K | 4,779 |
From the Form 4s in SEC's filing index; each date links to the filing. The Insider selling plans tab shows planned sales (10b5-1 plans and Form 144).
Work on COST in a spreadsheet:
Excel workbook (a sheet per section, ten years by column, charts, links to the filings) ·
CSV.
For a Google Sheet that stays up to date, paste =IMPORTDATA("https://tickdelta.com/company/COST/export.csv") into a cell.