The full Costco (COST) reaction history
COST news moved a median of -0.07% by the close. Every COST news event with the realized, point-in-time move the market made — the same measurement, headline by headline. Back to the COST overview →
Half of the 141 COST news events with a measured close landed between -0.86% and +0.50%; 48% closed up.
COST reaction counts across 4 years.
| Event type | 2026 | 2025 | 2024 | 2023 | Total |
|---|---|---|---|---|---|
| Press release | 18 | 28 | 29 | 4 | 79 |
| SEC filing · Form 8-K | 8 | 12 | 12 | 2 | 34 |
| SEC filing · Form 10-Q | 2 | 3 | 3 | 1 | 9 |
| SEC filing · Form 10-K | 1 | 1 | 1 | 0 | 3 |
| SEC filing · Form 11-K | 1 | 1 | 1 | 0 | 3 |
| SEC filing · Form ARS | 0 | 1 | 1 | 1 | 3 |
| SEC filing · Form DEF | 0 | 1 | 1 | 1 | 3 |
| SEC filing · Form DEFA14A | 0 | 1 | 1 | 1 | 3 |
| SEC filing · Form SD | 1 | 1 | 1 | 0 | 3 |
| SEC filing · Form S-3ASR | 1 | 0 | 0 | 0 | 1 |
| SEC filing · Form S-8 | 0 | 0 | 1 | 0 | 1 |
| All types | 32 | 49 | 51 | 10 | 142 |
Counts from the full measured window for COST, not just the free rows below — every event type we have labeled, year by year.
Older COST news pages.
Page 1 is the COST overview; pages 2–3 carry the rest of the measured list.
The 10 most recent COST reactions.
132 more COST reactions are behind a free account. Create one to see all 142 measured COST events — the same point-in-time reactions, every headline.
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More COST: earnings → · analyst actions → · SEC filings → · COST overview →
Other Consumer Staples names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Coca-Cola (KO) | 2,000+ | -0.02% | 47% |
| Walmart (WMT) | 2,000+ | +0.01% | 52% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.