Amphastar Pharmaceuticals, Inc. (AMPH) by event type
AMPH moves most on coverage initiations — a median of -0.54% at 30 minutes across 13 measured events. Each row is measured over the last three years and read against the price at its own news timestamp. Back to the AMPH overview →
How AMPH reacts across 5 measured event types.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades 381 of 2,717 | 13 | +0.49% | 54% | +0.27% |
| Analyst downgrades 594 of 2,603 | 28 | +0.32% | 68% | +0.85% |
| Coverage initiations 1,943 of 2,283 | 13 | -0.54% | 46% | -0.43% |
| Rating reiterations 3,176 of 3,522 | 34 | -0.34% | 41% | -0.76% |
| Price-target cuts 497 of 1,527 | 10 | +0.07% | 50% | -0.60% |
Last 3 years, pulled 2026-09-21. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The rank under each event type orders every name measured for it by median 30-min reaction, most positive first — so a low rank on a downgrade means this name falls harder than most, not that it moves less. Names with an identical median share a rank; a name the cross-section does not carry shows no rank rather than a guessed one. 1 further class was observed with fewer than 10 measured events and is not published.
That’s how AMPH usually reacts — get an email when it moves on news →Every name measured for these event types: Analyst upgrades → · Analyst downgrades → · Coverage initiations → · Rating reiterations → · Price-target cuts → · AMPH overview →
Other Healthcare names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| IPSEN SA S/ADR (IPSEY) | 294 | 0.00% | 6% |
| Adicet Bio, Inc. (ACET) | 293 | -0.83% | 36% |
| Merus N.V. - Common Shares (MRUS) | 292 | +0.03% | 54% |
| Trinity Biotech plc - American Depositary Shares (TRIB) | 292 | -0.13% | 44% |
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.