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Costco Wholesale stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions+14.8% to $1,053.56
Costco Wholesale (COST) stock rose 15% over the last 252 sessions, to $1,053.56. On the way it reported 0 quarters, its insiders filed 1 open-market trade and 4 Form 144 notices of planned sales, and the company filed 1 material 8-K. Each is marked on the price and listed with what the stock did next.
Each mark, and what followed
| Date | Kind | What | Next session | 5 sessions | 21 sessions |
|---|---|---|---|---|---|
| Oct 16, 2026 | 8-K | Directors and officers: departures, appointments, pay | +0.6% (+0.2% vs SPY) | +1.4% (+1.9% vs SPY) | — |
| Oct 13, 2026 | Form 144 | Form 144: William Richard Wilcox plans to sell $1.1M | −0.5% (−0.5% vs SPY) | +3.7% (+5.2% vs SPY) | — |
| Oct 13, 2026 | Insider sale | Wilcox William Richard sold $1.1M | −0.5% (−0.5% vs SPY) | +3.7% (+5.2% vs SPY) | — |
| Sep 29, 2026 | Form 144 | Form 144: Caton Frates plans to sell $733K | +0.2% (+0.4% vs SPY) | +0.1% (−1.1% vs SPY) | +7.2% (+6.7% vs SPY) |
| Sep 29, 2026 | Form 144 | Form 144: Claudine Adamo plans to sell $2.0M | +0.2% (+0.4% vs SPY) | +0.1% (−1.1% vs SPY) | +7.2% (+6.7% vs SPY) |
| Jun 23, 2026 | Form 144 | Form 144: Kenneth D Denman plans to sell $847K | +0.7% (+2.1% vs SPY) | −0.5% (0.0% vs SPY) | −2.6% (−3.0% vs SPY) |
Insiders’ record here
In the year on the chart, Costco Wholesale's insiders reported 0 open-market buys ($0) and 1 sale ($1.1M).
Across the whole universe (19,782 scored trades), insider buys beat the market 46% of the time and sales were followed by a lagging stock 61% of the time; buys of $1M or more 39%. Every pattern →
What this kind of 8-K usually did
| Item | 8-Ks | Next session, median | Up next session | 21 sessions, median | Typical size |
|---|---|---|---|---|---|
| 5.02 Directors and officers: departures, appointments, pay | 39,174 | −0.1% | 48% | +0.7% | ±1.4% |
Across every company in the move-odds universe, measured from the close before the filing. Every 8-K item ranked →
Costco Wholesale: every quarter → Live insider trades →
Prices are daily closes; filings and trades are as filed with the SEC (Form 4 within two business days of the trade, 8-K within four of the event). Moves after a mark are the stock's close-to-close change and the same for SPY; they describe the record, not what the next one will do. Not investment advice.