Costco (COST) insider trading and SEC filings
COSTCO WHOLESALE CORP /NEW · Nasdaq · Retail-Variety Stores
Company facts
What Costco tells the SEC about itself on the same registration record these filings come from.
- Industry (SIC) — Retail-Variety Stores
- Exchange — Nasdaq
- Filer category — Large accelerated filer
- Fiscal year end — August 30
- State of incorporation — Washington
- Former names — COSTCO COMPANIES INC (1997-1999); PRICE/COSTCO INC (1994-1997)
COST insider transactions
Officers, directors and 10% owners must tell the SEC when they buy or sell Costco stock, within two business days. These are the most recent, straight from EDGAR.
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 | Filing |
| 4 | 2026-09-30 | Claudine Adamo — Executive Vice President | Open-market sale · 2,200 shares | $915.93 | Sep 29, 2026 | 7,133 | Direct | Filing |
| 4 | 2026-09-14 | Wilcox William Richard — Executive Vice President | Grant or award · 4,129 shares | — | Sep 10, 2026 | 6,129 | Direct | Filing |
| 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 | Filing |
| 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 | Filing |
| 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 | Filing |
| 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 | Filing |
| 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 | Filing |
| Shares withheld for tax or exercise cost · 1,654 shares | $902.38 | Sep 10, 2026 | 8,712 | Direct |
Transaction wording follows the code on the filing itself — what each Form 4 code means. An option exercise or a tax withholding is not a market decision, and is not shown as one.
- Form 4 — An insider bought or sold company stock
Get COST's filings, read.
Other recent Costco filings
| Form | Filed | Document |
|---|---|---|
| 8-K | 2026-09-24 | 8-K |
| 8-K | 2026-07-08 | 8-K |
| 10-Q | 2026-06-03 | 10-Q |
| 8-K | 2026-05-28 | 8-K |
| 8-K | 2026-04-15 | 8-K |
| 10-Q | 2026-03-11 | 10-Q |
| 8-K | 2026-03-05 | 8-K |
| 10-K | 2025-10-08 | 10-K |
Reading these accurately
A Form 4 records what happened, precisely and on the record — it has no field for why. A sale can be scheduled months in advance under a Rule 10b5-1 plan, and vesting and option exercises appear alongside open-market decisions. The fuller version is in what insider buying and selling actually signals; to look up any other company, use the insider filing tracker.
Insider filings for other companies
Other companies Pip tracks, with their most recent SEC filings.