Select Medical Holdings Corporation (SEM) by event type
SEM moves most on analyst upgrades — a median of -0.27% 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 SEM overview →
How SEM reacts across 3 measured event types.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades 2,102 of 2,717 | 13 | -0.27% | 39% | +0.40% |
| Analyst downgrades 1,020 of 2,603 | 21 | +0.09% | 57% | +0.05% |
| Rating reiterations 2,688 of 3,522 | 30 | -0.13% | 33% | -0.30% |
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 SEM usually reacts — get an email when it moves on news →Every name measured for these event types: Analyst upgrades → · Analyst downgrades → · Rating reiterations → · SEM overview →
Other Healthcare names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| RA PHARMACEUTICALS (RARX) | 391 | -0.04% | 45% |
| Checkpoint Therapeutics, Inc. (CKPT) | 389 | 0.00% | 49% |
| PhaseBio Pharmaceuticals, Inc. (PHAS) | 385 | 0.00% | 48% |
| ARADIGM CORP COMMON STOCK (ARDM) | 384 | 0.00% | 39% |
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.