Spero Therapeutics, Inc. (SPRO) by event type
SPRO moves most on analyst upgrades — a median of +0.30% 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 SPRO overview →
How SPRO reacts across 2 measured event types.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades 603 of 2,717 | 12 | +0.30% | 58% | -2.36% |
| Rating reiterations 1,583 of 3,522 | 27 | 0.00% | 41% | -3.01% |
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 SPRO usually reacts — get an email when it moves on news →Every name measured for these event types: Analyst upgrades → · Rating reiterations → · SPRO overview →
Other Healthcare names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| PAVmed Inc. (PAVM) | 193 | -0.49% | 41% |
| SIENNA BIOPHARMACEUTICALS (SNNA) | 193 | 0.00% | 40% |
| Xtant Medical Holdings, Inc. (XTNT) | 193 | 0.00% | 42% |
| Apollo Medical Holdings, Inc. (AMEH) | 192 | +0.16% | 55% |
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.