Boston Scientific Corporation (BSX)
BSX moved a median of +0.07% 30 minutes after news, and +0.15% by the close. How BSX actually reacts to news — the realized, point-in-time move the market made, measured across 912 labeled events over the last three years with zero look-ahead.
BSX’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | -0.01% | 49% | 910 |
| 30-min | +0.07% | 54% | 912 |
| 60-min | +0.02% | 50% | 912 |
| to close | +0.15% | 53% | 909 |
| Middle 50% of BSX reactions | -0.39% to +0.56% |
|---|---|
| Median reaction (30-min) | +0.07% |
| Measured reactions | 912 |
Half of all Boston Scientific Corporation news events land between -0.39% and +0.56% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How BSX reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 29 | -0.25% | 35% | +0.03% |
| Analyst downgrades | 39 | +0.36% | 64% | +0.41% |
| Rating reiterations | 264 | -0.02% | 48% | -0.07% |
| Price-target raises | 100 | -0.03% | 46% | -0.05% |
| Price-target cuts | 38 | -0.06% | 50% | -0.00% |
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. 1 further class was observed with fewer than 10 measured events and is not published. See how BSX ranks against every other measured name →
That’s how BSX usually reacts — get an email when it moves on news →Email me when BSX moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to BSX's baseline. Nothing else.
Recent BSX events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Boston Scientific appoints Joseph M. Fitzgerald Executive Vice President and Chief Operating Officer | Press release | PR Newswire | -0.06% | -1.33% | |
| Form 8-K BOSTON SCIENTIFIC CORP For: Oct 01 | SEC filing · Form 8-K | SEC EDGAR | -0.06% | -1.33% | |
| Form 8-K BOSTON SCIENTIFIC CORP For: Sep 21 | SEC filing · Form 8-K | SEC EDGAR | +1.18% | -0.93% | |
| Form 8-K BOSTON SCIENTIFIC CORP For: Sep 07 | SEC filing · Form 8-K | SEC EDGAR | -0.19% | -4.38% | |
| Form 8-K BOSTON SCIENTIFIC CORP For: Aug 26 | SEC filing · Form 8-K | SEC EDGAR | +2.94% | +2.49% | |
| Boston Scientific announces participation in Wells Fargo 21st Annual Healthcare Conference and conference call discussing third quarter 2026 results | Press release | PR Newswire | +0.58% | — | |
| Form 10-Q BOSTON SCIENTIFIC CORP For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +1.37% | +1.40% | |
| Boston Scientific announces results for second quarter 2026 | Press release | PR Newswire | +1.80% | +7.90% | |
| Form 8-K BOSTON SCIENTIFIC CORP For: Jul 29 | SEC filing · Form 8-K | SEC EDGAR | +1.80% | +7.90% | |
| Form 8-K BOSTON SCIENTIFIC CORP For: Jul 21 | SEC filing · Form 8-K | SEC EDGAR | +0.34% | -0.78% | |
| Form 11-K BOSTON SCIENTIFIC CORP For: Dec 31 | SEC filing · Form 11-K | SEC EDGAR | -0.18% | -0.43% | |
| Form SD BOSTON SCIENTIFIC CORP | SEC filing · Form SD | SEC EDGAR | +0.95% | +0.31% | |
| FRACTURE IDE trial of the Boston Scientific SEISMIQ™ 4CE Coronary Intravascular Lithotripsy Catheter meets primary safety and effectiveness endpoints | Press release | PR Newswire | +0.51% | +0.48% | |
| Boston Scientific announces strategic investment in MiRus LLC | Press release | PR Newswire | +0.42% | +4.41% | |
| Boston Scientific enters into $2 billion accelerated share repurchase agreement | Press release | PR Newswire | +0.42% | +4.41% | |
| Form 8-K BOSTON SCIENTIFIC CORP For: May 18 | SEC filing · Form 8-K | SEC EDGAR | +0.42% | +4.41% | |
| Form S-8 BOSTON SCIENTIFIC CORP | SEC filing · Form S-8 | SEC EDGAR | -0.26% | -0.74% | |
| Form 8-K BOSTON SCIENTIFIC CORP For: Apr 30 | SEC filing · Form 8-K | SEC EDGAR | -1.13% | +0.32% | |
| Boston Scientific announces participation in Bernstein's 42nd Annual Strategic Decisions Conference and conference call discussing second quarter 2026 results | Press release | PR Newswire | +0.71% | +0.35% | |
| Form 10-Q BOSTON SCIENTIFIC CORP For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +0.49% | -1.76% | |
| Data at Heart Rhythm 2026 highlight key Boston Scientific therapies | Press release | PR Newswire | +0.10% | -2.06% | |
| Boston Scientific announces results for first quarter 2026 | Press release | PR Newswire | +2.48% | +3.96% | |
| Form 8-K BOSTON SCIENTIFIC CORP For: Apr 22 | SEC filing · Form 8-K | SEC EDGAR | +2.48% | +3.96% | |
| Form EFFECT BOSTON SCIENTIFIC CORP | SEC filing · Form EFFECT | SEC EDGAR | +0.27% | +1.24% | |
| Boston Scientific announces conference call discussing first quarter 2026 results | Press release | PR Newswire | +1.09% | -1.67% | |
| Boston Scientific receives FDA clearance for the Asurys™ Fluid Management System | Press release | PR Newswire | +1.09% | -1.67% | |
| Form 8-K BOSTON SCIENTIFIC CORP For: Mar 28 | SEC filing · Form 8-K | SEC EDGAR | +1.09% | -1.67% | |
| Form S-4/A BOSTON SCIENTIFIC CORP | SEC filing · Form S-4 | SEC EDGAR | +1.09% | -1.67% | |
| CHAMPION-AF study of the WATCHMAN FLX™ Left Atrial Appendage Closure Device as a first-line therapy for stroke risk reduction meets all primary and secondary safety and efficacy endpoints | Press release | PR Newswire | +1.09% | -1.67% | |
| HI-PEITHO trial demonstrates Boston Scientific EKOS™ Endovascular System is superior to standard of care for treatment of acute pulmonary embolism | Press release | PR Newswire | +1.09% | -1.67% | |
| Form ARS BOSTON SCIENTIFIC CORP For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | +0.52% | -1.83% | |
| Form DEF 14A BOSTON SCIENTIFIC CORP For: Mar 18 | SEC filing · Form DEF | SEC EDGAR | +0.52% | -1.83% | |
| Form DEFA14A BOSTON SCIENTIFIC CORP | SEC filing · Form DEFA14A | SEC EDGAR | +0.52% | -1.83% | |
| BSX Lawsuit Alleges Claims Executives Misrepresented U.S. Electrophysiology Volumes - BOSTON SCIENTIFIC CORPORATION Investors Face Losses Following Claims Executives Misrepresented U.S. Electrophysiology Volumes: SueWallSt | Press release | PR Newswire | -1.06% | -1.55% | |
| Important Notice to Long-Term Shareholders of Boston Scientific Corporation (NYSE: BSX): Corcept Therapeutics, Inc. (NASDAQ: CORT); Nektar Therapeutics (NASDAQ: NKTR): and Unicycive Therapeutics, Inc. (NASDAQ: UNCY): Grabar Law Office Investigates Claims | Press release | GlobeNewswire | -0.13% | -2.00% | |
| Boston Scientific to host investor event at the 75th Annual Scientific Session of the American College of Cardiology | Press release | PR Newswire | -0.47% | -2.13% | |
| Form PRE 14A BOSTON SCIENTIFIC CORP For: Mar 06 | SEC filing · Form PRE | SEC EDGAR | +0.06% | +2.25% | |
| Form S-4 BOSTON SCIENTIFIC CORP | SEC filing · Form S-4 | SEC EDGAR | -0.10% | -0.08% | |
| Form 8-K BOSTON SCIENTIFIC CORP For: Feb 26 | SEC filing · Form 8-K | SEC EDGAR | +1.00% | +2.10% | |
| Boston Scientific elects Cathy Smith and Christophe Weber to Board of Directors | Press release | PR Newswire | +1.19% | +0.14% | |
| Form 8-K BOSTON SCIENTIFIC CORP For: Feb 18 | SEC filing · Form 8-K | SEC EDGAR | -0.70% | +0.87% | |
| Form 10-K BOSTON SCIENTIFIC CORP For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | -0.52% | +0.51% | |
| Boston Scientific to participate in TD Cowen's 46th Annual Health Care Conference | Press release | PR Newswire | +1.14% | -0.12% | |
| Form 8-K BOSTON SCIENTIFIC CORP For: Feb 02 | SEC filing · Form 8-K | SEC EDGAR | +2.35% | -0.23% | |
| Boston Scientific announces results for fourth quarter and full year 2025 | Press release | PR Newswire | -0.15% | -5.63% | |
| Form 8-K BOSTON SCIENTIFIC CORP For: Feb 04 | SEC filing · Form 8-K | SEC EDGAR | -0.15% | -5.63% | |
| Boston Scientific announces agreement to acquire Penumbra, Inc. | Press release | PR Newswire | +1.09% | +2.46% | |
| Form 8-K BOSTON SCIENTIFIC CORP For: Jan 14 | SEC filing · Form 8-K | SEC EDGAR | -1.21% | -1.94% | |
| Form 8-K BOSTON SCIENTIFIC CORP For: Jan 15 | SEC filing · Form 8-K | SEC EDGAR | +1.09% | +2.46% | |
| Boston Scientific Announces Agreement to Acquire Valencia Technologies Corporation | Press release | PR Newswire | -0.94% | -2.23% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the BSX section they belong to.
Where else BSX is measured.
BSX earnings → · Analyst actions → · SEC filings →
Other Healthcare names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Illumina, Inc. (ILMN) | 914 | +0.02% | 51% |
| Twist Bioscience Corporation (TWST) | 914 | -0.01% | 50% |
| Concert Pharmaceuticals, Inc. (CNCE) | 911 | 0.00% | 48% |
| TROVAGENE (TROV) | 906 | -0.52% | 40% |
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 →
Every ticker we measure the same way24
Apple (AAPL)
How AAPL actually reacts to news, measured.
NVIDIA (NVDA)
How NVDA actually reacts to news, measured.
Tesla (TSLA)
How TSLA actually reacts to news, measured.
Microsoft (MSFT)
How MSFT actually reacts to news, measured.
Advanced Micro Devices (AMD)
How AMD actually reacts to news, measured.
Amazon (AMZN)
How AMZN actually reacts to news, measured.
Alphabet (GOOG)
How GOOG actually reacts to news, measured.
Meta Platforms (META)
How META actually reacts to news, measured.
Broadcom (AVGO)
How AVGO actually reacts to news, measured.
JPMorgan Chase (JPM)
How JPM actually reacts to news, measured.
Visa (V)
How V actually reacts to news, measured.
Walmart (WMT)
How WMT actually reacts to news, measured.
Eli Lilly (LLY)
How LLY actually reacts to news, measured.
UnitedHealth Group (UNH)
How UNH actually reacts to news, measured.
Netflix (NFLX)
How NFLX actually reacts to news, measured.
Johnson & Johnson (JNJ)
How JNJ actually reacts to news, measured.
Exxon Mobil (XOM)
How XOM actually reacts to news, measured.
Home Depot (HD)
How HD actually reacts to news, measured.
Costco (COST)
How COST actually reacts to news, measured.
Mastercard (MA)
How MA actually reacts to news, measured.
Oracle (ORCL)
How ORCL actually reacts to news, measured.
Salesforce (CRM)
How CRM actually reacts to news, measured.
Bank of America (BAC)
How BAC actually reacts to news, measured.
Coca-Cola (KO)
How KO actually reacts to news, measured.
Walt Disney (DIS)
How DIS actually reacts to news, measured.
Browse all tickers
Every name we’ve measured, in one place.
How the numbers are made.
How is Boston Scientific Corporation's median reaction calculated?
Every labeled BSX 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 912 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. 54% of BSX'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 BSX'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.