Transactions
7
Insider / COSTCO WHOLESALE CORP /NEW
Barbre Tiffany Marie
Insider at COSTCO WHOLESALE CORP /NEW
- Company
- COSTCO WHOLESALE CORP /NEW
- Ticker
- COST
- First filing on record
- October 24, 2025
- Latest trade on record
- October 24, 2025
- SEC filings
- EDGAR ↗
Barbre Tiffany Marie, Insider at COSTCO WHOLESALE CORP /NEW, has disclosed 7 transactions in COST since October 24, 2025: 0 purchases (0 open-market buys) and 6 sales, worth about $1.7M at the reported prices. The latest was filed October 24, 2025, 0 days after the trade.
Open-market buys
0
Sales
6
Avg. disclosure lag
1.7d
Trading in charts
Portfolio mix
Which stocks does this person trade most? Tile size is dollars traded, all time on record.
Barbre Tiffany Marie has traded 1 stock on record; the largest by dollars is COST.
What kind of transactions
Most Form 4 rows are pay arriving or tax being withheld, not a decision to buy or sell. Only code P is an open-market purchase and code S an open-market sale. What each code means: Form 4 transaction codes.
| Code | Meaning | Rows | Shares | Value |
|---|---|---|---|---|
| F | Shares withheld for tax | 5 | 542 | $512K |
| A | Grant or award | 1 | 2,118 | — |
| S | Open-market sale | 1 | 1,239 | $1.2M |
| Year | Rows | Bought | Sold |
|---|---|---|---|
| 2025 | 7 | 0 | 6 · $1.7M |
Transactions
| Security | Side | Trade date | Disclosed | Lag | Shares | Price | Value | Flags | Source | Share |
|---|---|---|---|---|---|---|---|---|---|---|
| COST | Sell S | October 24, 2025 | October 24, 2025 | 0d | 1,239 | $935 | $1.2M | Form 4 ↗ | ||
| COST | Sell F | October 22, 2025 | October 24, 2025 | 2d | 85 | $945 | $80K | Form 4 ↗ | ||
| COST | Sell F | October 22, 2025 | October 24, 2025 | 2d | 135 | $945 | $128K | Form 4 ↗ | ||
| COST | Sell F | October 22, 2025 | October 24, 2025 | 2d | 119 | $945 | $112K | Form 4 ↗ | ||
| COST | Sell F | October 22, 2025 | October 24, 2025 | 2d | 90 | $945 | $85K | Form 4 ↗ | ||
| COST | Sell F | October 22, 2025 | October 24, 2025 | 2d | 114 | $945 | $107K | Form 4 ↗ | ||
| COST | Other A | October 22, 2025 | October 24, 2025 | 2d | 2,118 | — | — | Form 4 ↗ |
Filings
| Filed | Form | Accession | Rows | Status | Source |
|---|---|---|---|---|---|
| October 24, 2025 | Form 4 | 0000909832-25-000144 | 7 | published | EDGAR ↗ |
Other insiders at COSTCO WHOLESALE CORP /NEW
- Klauer James C Executive Vice President 13 rows
- Adamo Claudine Executive Vice President 10 rows
- Frates Caton Executive Vice President 9 rows
- MILLERCHIP GARY Executive Vice President 8 rows
- DENMAN KENNETH D Director 7 rows
- STANTON JOHN W Director 7 rows
- Vachris Roland Michael President and CEO 7 rows
- DECKER SUSAN L Director 6 rows
- George Sarah Catherine Executive Vice President 6 rows
- POLIT JAVIER Executive Vice President 6 rows
Everyone on file, with contracts and lobbying under the company's name: COSTCO WHOLESALE CORP /NEW.
Guides for this page
- What is SEC Form 4? Who files: officers, directors and owners of more than 10% of a class of the company's shares.
- Form 4 transaction codes P = purchase. S = sale. These are the two market trades.
- Insider buying vs insider selling Selling outweighs buying by a wide margin in normal times.
- What disclosure data cannot tell you Filings are late by design: up to 45 days for Congress, two business days for insiders.
Sources and method
| Source | Filings | Rows | First filed | Newest filed | Read the originals |
|---|---|---|---|---|---|
| SEC EDGAR, Form 4 | 1 | 7 | October 24, 2025 | October 24, 2025 | Form 4 list on EDGAR |
Site built October 27, 2026. Every row in the tables above links to its own filing. To quote a figure, use the Cite button at the top of the page; see how to cite and reuse.
Every row comes from the reporting owner's Form 4 as filed with the SEC (EDGAR ownership XML), read daily. "Value" is shares × the reported price; code P is an open-market purchase, S a sale, M an option exercise, A a grant. The lag is the filing date minus the trade date; Form 4 is due within two business days. Amendments (4/A) are not merged. Details on the methodology page; report an error on corrections.
Not investment advice. Figures are public disclosures shown as filed; they may lag the trade and may be amended later. No recommendation is made or implied.