Selecta Biosciences, Inc. (SELB)
SELB moved a median of -0.80% 30 minutes after news, and -2.09% by the close. How SELB actually reacts to news — the realized, point-in-time move the market made, measured across 61 labeled events over the last three years with zero look-ahead.
SELB’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | -1.69% | 8% | 12 |
| 30-min | -0.80% | 17% | 12 |
| 60-min | 0.00% | 42% | 12 |
| to close | -2.09% | 42% | 12 |
| Middle 50% of SELB reactions | -0.82% to -0.24% |
|---|---|
| Median reaction (30-min) | -0.80% |
| Measured reactions | 61 |
Half of all Selecta Biosciences, Inc. news events land between -0.82% and -0.24% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
Email me when SELB moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to SELB's baseline. Nothing else.
Recent SELB events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 8-K/A Cartesian Therapeutics, For: Nov 13 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 8-K Cartesian Therapeutics, For: Jan 17 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form S-8 Cartesian Therapeutics, | SEC filing · Form S-8 | SEC EDGAR | — | — | |
| Cartesian Therapeutics Announces Positive Long-Term Follow-Up Data from Phase 2a Study of Lead mRNA Cell Therapy Candidate Descartes-08 in Patients with Myasthenia Gravis | Press release | GlobeNewswire | — | — | |
| Cartesian Therapeutics Highlights Progress and 2024 Strategic Priorities Across Innovative Pipeline of mRNA Cell Therapies for Autoimmunity | Press release | GlobeNewswire | — | — | |
| Form 8-K Cartesian Therapeutics, For: Jan 08 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 8-A12G Cartesian Therapeutics, | SEC filing · Form 8-A12G | SEC EDGAR | — | — | |
| Form D/A Cartesian Therapeutics, | SEC filing · Form D | SEC EDGAR | — | — | |
| Form EFFECT Cartesian Therapeutics, | SEC filing · Form EFFECT | SEC EDGAR | — | — | |
| Form D Cartesian Therapeutics, | SEC filing · Form D | SEC EDGAR | — | — | |
| Form S-3/A Cartesian Therapeutics, | SEC filing · Form S-3 | SEC EDGAR | — | — | |
| Form 8-K Cartesian Therapeutics, For: Nov 21 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 10-Q Cartesian Therapeutics, For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | — | — | |
| Form 8-K SELECTA BIOSCIENCES INC For: Nov 13 | SEC filing · Form 8-K | SEC EDGAR | -5.56% | -2.09% | |
| Form DEFA14A SELECTA BIOSCIENCES INC | SEC filing · Form DEFA14A | SEC EDGAR | -5.56% | -2.09% | |
| Selecta Biosciences Announces Merger with Cartesian Therapeutics | Press release | GlobeNewswire | -5.56% | -2.09% | |
| Form 8-K SELECTA BIOSCIENCES INC For: Oct 31 | SEC filing · Form 8-K | SEC EDGAR | -1.65% | -4.13% | |
| Selecta Announces Transition of Manufacturing and Clinical Operations of ImmTOR for SEL-212 to Commercialization Partner Sobi | Press release | GlobeNewswire | -1.65% | -4.13% | |
| Form S-3 SELECTA BIOSCIENCES INC | SEC filing · Form S-3 | SEC EDGAR | -1.74% | +3.48% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the SELB section they belong to.
Where else SELB is measured.
SELB earnings → · Analyst actions → · SEC filings →
Other Healthcare names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| THERAPEUTIC SLTNS INTL (TSOI) | 62 | 0.00% | 28% |
| GREEN CURES & BOTANICAL (GRCU) | 61 | 0.00% | 47% |
| REPLICEL LIFE SCIENCE ORD (REPCF) | 59 | 0.00% | 27% |
| REALM THERAPEUTICS PLC ADS (RLM) | 59 | 0.00% | 41% |
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 Selecta Biosciences, Inc.'s median reaction calculated?
Every labeled SELB 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 61 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. 17% of SELB'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 SELB'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.