Prothena Corporation plc - Ordinary Shares (PRTA) by event type
PRTA moves most on analyst upgrades — a median of -0.90% at 30 minutes across 12 measured events. Each row is measured over the last three years and read against the price at its own news timestamp. Back to the PRTA overview →
How PRTA reacts across 4 measured event types.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades 2,577 of 2,717 | 12 | -0.90% | 25% | -1.58% |
| Analyst downgrades 1,857 of 2,603 | 21 | -0.19% | 48% | -2.37% |
| Rating reiterations 293 of 3,522 | 76 | +0.31% | 63% | -0.80% |
| Price-target cuts 38 of 1,527 | 21 | +0.56% | 76% | -0.42% |
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. 2 further classes were observed with fewer than 10 measured events and are not published.
That’s how PRTA usually reacts — get an email when it moves on news →Every name measured for these event types: Analyst upgrades → · Analyst downgrades → · Rating reiterations → · Price-target cuts → · PRTA overview →
Other Healthcare names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Addus HomeCare Corporation (ADUS) | 256 | -0.02% | 47% |
| Celldex Therapeutics, Inc. (CLDX) | 256 | +0.04% | 57% |
| Xeris Biopharma Holdings, Inc. (XERS) | 256 | +0.32% | 57% |
| Cerus Corporation (CERS) | 255 | +0.09% | 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.