Mersana Therapeutics, Inc. (MRSN) by event type
MRSN moves most on analyst downgrades — a median of +0.36% at 30 minutes across 14 measured events. Each row is measured over the last three years and read against the price at its own news timestamp. Back to the MRSN overview →
How MRSN reacts across 3 measured event types.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades 857 of 2,717 | 16 | +0.18% | 56% | -2.17% |
| Analyst downgrades 526 of 2,603 | 14 | +0.36% | 71% | +2.61% |
| Rating reiterations 1,220 of 3,522 | 20 | +0.04% | 50% | -1.07% |
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. 3 further classes were observed with fewer than 10 measured events and are not published.
That’s how MRSN usually reacts — get an email when it moves on news →Every name measured for these event types: Analyst upgrades → · Analyst downgrades → · Rating reiterations → · MRSN overview →
Other Healthcare names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| DOVA PHARMACEUTICALS (DOVA) | 251 | -0.10% | 46% |
| Krystal Biotech, Inc. (KRYS) | 251 | +0.05% | 52% |
| Soligenix, Inc. (SNGX) | 251 | -0.71% | 35% |
| Co-Diagnostics, Inc. (CODX) | 250 | 0.00% | 46% |
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.