Claudine Adamo is President & VP at COSTCO WHOLESALE CORP /NEW (COST). They have made 9 open-market trades across 1 company since 2022, most recently 2026-10-22.
CIK 0001916124
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 9 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| COST | 6,441 | $6.7M |
Shares reported on the most recent Form 4, priced at the 2026-10-26 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| COST | SELL | 2026-09-29 | 2026-09-30 | $915.93 | $2.0M | +5.1% | +11.0% | — |
| COST | SELL | 2026-03-09 | 2026-03-11 | $1003.02 | $732K | -2.3% | +1.0% | -2.0% |
| COST | SELL | 2025-10-24 | 2025-10-24 | $935.68 | $2.5M | +0.5% | -4.7% | +4.9% |
| COST | SELL | 2025-03-24 | 2025-03-25 | $922.56 | $830K | -1.9% | +4.4% | +7.5% |
| COST | SELL | 2024-09-30 | 2024-10-02 | $888.99 | $2.8M | +1.8% | +0.3% | +4.8% |
| COST | SELL | 2024-03-11 | 2024-03-13 | $714.83 | $1.1M | -1.0% | -1.0% | +15.0% |
| COST | SELL | 2023-10-23 | 2023-10-24 | $548.92 | $2.8M | +2.3% | +7.8% | +26.2% |
| COST | SELL | 2022-10-26 | 2022-10-27 | $495.97 | $992K | -0.9% | +6.8% | -1.3% |
| COST | SELL | 2022-04-08 | 2022-04-08 | $602.03 | $301K | -1.2% | -16.7% | -17.3% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.