Select Medical Holdings Corporation (SEM)
SEM moved a median of -0.03% 30 minutes after news, and 0.00% by the close. How SEM actually reacts to news — the realized, point-in-time move the market made, measured across 387 labeled events over the last three years with zero look-ahead.
SEM’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 44% | 357 |
| 30-min | -0.03% | 41% | 358 |
| 60-min | -0.03% | 41% | 358 |
| to close | 0.00% | 49% | 357 |
| Middle 50% of SEM reactions | -0.56% to +0.14% |
|---|---|
| Median reaction (30-min) | -0.03% |
| Measured reactions | 387 |
Half of all Select Medical Holdings Corporation news events land between -0.56% and +0.14% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How SEM reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 13 | -0.27% | 39% | +0.40% |
| Analyst downgrades | 21 | +0.09% | 57% | +0.05% |
| Rating reiterations | 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 same measurement runs across every name in the dataset. 3 further classes were observed with fewer than 10 measured events and are not published. See how SEM ranks against every other measured name →
That’s how SEM usually reacts — get an email when it moves on news →Email me when SEM moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to SEM's baseline. Nothing else.
Recent SEM events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 8-K SELECT MEDICAL HOLDINGS For: Jun 30 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form S-8 POS SELECT MEDICAL HOLDINGS | SEC filing · Form S-8 | SEC EDGAR | — | — | |
| Select Medical Holdings Corporation Acquired by Consortium Led by Robert A. Ortenzio, Martin F. Jackson, and WCAS | Press release | PR Newswire | — | — | |
| Form 8-K SELECT MEDICAL HOLDINGS For: Jun 26 | SEC filing · Form 8-K | SEC EDGAR | -0.18% | -0.18% | |
| Select Medical Holdings Corporation Announces Stockholder Approval of Acquisition by Consortium Led by Robert A. Ortenzio, Martin F. Jackson, and WCAS | Press release | PR Newswire | -0.18% | -0.18% | |
| Form 8-K SELECT MEDICAL HOLDINGS For: Jun 22 | SEC filing · Form 8-K | SEC EDGAR | -0.36% | -0.36% | |
| $SEM Investigation Notice: BFA Law is Investigating the Select Medical Board for Breaching its Duties to Shareholders after $16.50 Acquisition Announced | Press release | GlobeNewswire | -0.12% | -0.36% | |
| SEM Shareholder News: Select Medical Investors may have Rights in Investigation over $16.50 per share Acquisition – Current Shareholders Urged to Contact BFA Law | Press release | GlobeNewswire | +0.06% | +0.06% | |
| $SEM Class Alert: Select Medical Shareholders Have Rights in Pending Investigation Into The Board Over The Announced Acquisition - Contact BFA Law if You Hold Shares | Press release | ACCESS Newswire | +0.06% | +0.06% | |
| $SEM Legal News: BFA Law Announces an Investigation Into The Board on Behalf of Select Medical Shareholders Following Acquisition Announcement | Press release | ACCESS Newswire | +0.06% | +0.06% | |
| $SEM Investigation: Select Medical $16.50 per share Acquisition Announcement Triggers Investigation into the Board - Current Shareholders Notified to Protect Your Rights | Press release | ACCESS Newswire | +0.00% | -0.06% | |
| $SEM Stock Drop Reminder: Select Medical Announces $16.50 per share Acquisition – BFA Law’s Investigation into the Board is Ongoing | Press release | GlobeNewswire | -0.06% | +0.00% | |
| Select Medical (SEM) Board Investigated for Breaching its Duties to Investors - Current Shareholders Urged to Protect Your Rights | Press release | ACCESS Newswire | -0.18% | +0.06% | |
| $SEM Report: Select Medical Board Investigated For Breaching Its Fiduciary Duties in Connection With The Announced $16.50 Per Share Acquisition | Press release | ACCESS Newswire | -0.06% | -0.03% | |
| Select Medical Investigation: Select Medical (SEM) Board Investigated after Announcing $16.50 per share Acquisition – Contact BFA Law if You Hold Shares | Press release | GlobeNewswire | -0.09% | -0.30% | |
| $SEM Stockholder Alert: Current Select Medical Shareholders Have Rights in Pending Investigation Into The Announced $16.50 Acquisition | Press release | ACCESS Newswire | -0.09% | -0.30% | |
| Stock Alert: Select Medical (SEM) $16.50 Acquisition Annoucement Triggers Investigation into the Board on behalf of Current Shareholders | Press release | PR Newswire | +0.00% | +0.24% | |
| $SEM Ongoing Investigation: Select Medical Board Investigated For Breaching Its Duties to Current Shareholders Over $16.50 Transaction | Press release | ACCESS Newswire | +0.00% | -0.09% | |
| $SEM Securities Notice: BFA Law Notifies Select Medical Shareholders the Pending Investigation into the $16.50 per share Acquisition | Press release | GlobeNewswire | +0.12% | +0.06% | |
| $SEM Inquiry Reminder: Current Select Medical Shareholders Notified to Protect Your Rights in Connection With The Pending Investigation Into $16.50 Acquisition | Press release | ACCESS Newswire | +0.12% | +0.06% | |
| Select Medical (SEM) Board Hit With Investigation Following Announcement of $16.50 Merger Price | Press release | ACCESS Newswire | +0.12% | +0.06% | |
| $SEM Stock Notification: Current Shareholder of Select Medical? Contact BFA Law about its Ongoing Investigation into the Board Over $16.50 per share Acquisition | Press release | GlobeNewswire | +0.00% | +0.12% | |
| $SEM Shareholder Reminder: The Select Medical Investigation into the Board Over the Upcoming Transaction is Ongoing - Investors Notified to Protect Your Rights | Press release | ACCESS Newswire | +0.03% | -0.03% | |
| Kaskela Law LLC Announces Investigation into Fairness of $16.50 Per Share Select Medical Holdings (SEM) Stockholder Buyout; Affected Investors are Encouraged to Contact the Firm to Protect Their Investment and Legal Rights | Press release | Business Wire | -0.06% | -0.42% | |
| SEM Alert: BFA Law Reminds Select Medical Shareholders of its Pending Investigation into the Board after $16.50 per share Acquisition is Announced | Press release | Business Wire | -0.06% | -0.42% | |
| $SEM Class Investigation: Select Medical Announces $16.50 per share Acquisition - Investigation for Current Shareholders is Underway | Press release | ACCESS Newswire | +0.03% | +0.00% | |
| SEM Legal Claims: The Select Medical Board may have Breached its Fiduciary Duties to Investors – Contact BFA Law about its Pending Investigation into the Merger | Press release | GlobeNewswire | -0.03% | -0.06% | |
| $SEM Investigation Alert: Select Medical $16.50 Merger Deal Triggers Investigation into the Board on behalf of Current Shareholders | Press release | ACCESS Newswire | +0.00% | -0.12% | |
| Are SEM, AFBI, BLD, QXO Obtaining Fair Deals for their Shareholders? | Press release | PR Newswire | +0.18% | -0.12% | |
| SEM Stock Notification: Select Medical Board Investigated for Breaching its Duties to Investors Over $16.50 Acquisition Price | Press release | PR Newswire | +0.18% | -0.12% | |
| $SEM Merger Investigation Initiated: Select Medical Investors Notified of the Pending Investigation into the $16.50 Acquisition Announcement | Press release | ACCESS Newswire | +0.00% | +0.06% | |
| SEM Shareholder Notification: Select Medical $16.50 Merger Announcement Triggers Investigation into the Board on behalf of Current Shareholders – Contact BFA Law | Press release | GlobeNewswire | +0.03% | +0.06% | |
| Shareholder Investigation: The Select Medical ($SEM) Board is being Investigated on behalf of Current Shareholders for Breaching their Fiduciary Duties in Connection with Announced Merger | Press release | ACCESS Newswire | +0.03% | +0.06% | |
| $SEM Ongoing Investigation Alert: Select Medical Investigation Into The Board Over Merger is Pending - Current Investors Notified to Protect Your Rights | Press release | ACCESS Newswire | +0.00% | -0.03% | |
| $SEM Securities News: BFA Law is Investigating the Select Medical Merger – Current Shareholders are Notified to Contact the Firm | Press release | GlobeNewswire | +0.00% | +0.00% | |
| SEM Acquisition Announcement: Select Medical Shareholders are Notified of BFA Law’s Investigation into the Announced $16.50 per Share Transaction | Press release | Business Wire | +0.00% | +0.03% | |
| Halper Sadeh LLC is Investigating Whether SEM, EVTV, SILA are Obtaining Fair Deals for their Shareholders | Press release | GlobeNewswire | +0.03% | -0.12% | |
| Is $16.50 Per Share a Fair Buyout Price for Select Medical Holdings (SEM) Shareholders? Kaskela Law Encourages SEM Shareholders to Contact the Firm to Discuss Their Rights and Options to Seek Additional Compensation | Press release | PR Newswire | -0.09% | -0.30% | |
| SELECT MEDICAL AND CARILION CLINIC ENTER INTO JOINT VENTURE PARTNERSHIP TO OPERATE AN INPATIENT REHABILITATION HOSPITAL IN ROANOKE, VIRGINIA | Press release | PR Newswire | -0.03% | +0.00% | |
| Form DEFM14A SELECT MEDICAL HOLDINGS | SEC filing · Form DEFM14A | SEC EDGAR | -0.06% | +0.06% | |
| Halper Sadeh LLC is Investigating Whether SEM, WSR, INM, GDOT are Obtaining Fair Deals for their Shareholders | Press release | GlobeNewswire | -0.03% | +0.00% | |
| Form PRER14A SELECT MEDICAL HOLDINGS | SEC filing · Form PRER14A | SEC EDGAR | +0.06% | +0.21% | |
| Bronstein, Gewirtz & Grossman, LLC Encourages Select Medical Holdings Corp. (SEM) Shareholders to Inquire about Securities Investigation | Press release | ACCESS Newswire | +0.00% | -0.03% | |
| Bronstein, Gewirtz & Grossman, LLC Is Investigating Select Medical Holdings Corp. (SEM) And Encourages Shareholders to Connect | Press release | ACCESS Newswire | +0.03% | -0.03% | |
| Bronstein, Gewirtz & Grossman, LLC Initiates an Investigation into Allegations Against Select Medical Holdings Corp. (SEM) And Encourages Shareholders to Reach Out | Press release | ACCESS Newswire | +0.03% | +0.00% | |
| Bronstein, Gewirtz & Grossman, LLC Encourages Select Medical Holdings Corp. (SEM) Stockholders to Inquire about Securities Investigation | Press release | ACCESS Newswire | +0.00% | -0.09% | |
| Form 10-Q SELECT MEDICAL HOLDINGS For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | -0.06% | -0.06% | |
| Form 8-K SELECT MEDICAL HOLDINGS For: Apr 28 | SEC filing · Form 8-K | SEC EDGAR | -0.06% | -0.06% | |
| Select Medical Holdings Corporation Announces Results For Its First Quarter Ended March 31, 2026 and Cash Dividend | Press release | PR Newswire | -0.06% | -0.06% | |
| Select Medical Holdings Corp. (SEM) Investigation: Bronstein, Gewirtz & Grossman, LLC Encourages Shareholders to Contact the Firm to Learn More About the Investigation | Press release | ACCESS Newswire | +0.00% | +0.24% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the SEM section they belong to.
Where else SEM is measured.
SEM earnings → · Analyst actions → · SEC filings →
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.
All Healthcare names, measured the same way →
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Every name we’ve measured, in one place.
How the numbers are made.
How is Select Medical Holdings Corporation's median reaction calculated?
Every labeled SEM news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 387 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 41% of SEM's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does SEM's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.