89bio, Inc. (ETNB)
ETNB moved a median of -0.13% 30 minutes after news, and -0.14% by the close. How ETNB actually reacts to news — the realized, point-in-time move the market made, measured across 291 labeled events over the last three years with zero look-ahead.
ETNB’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | -0.35% | 36% | 259 |
| 30-min | -0.13% | 43% | 259 |
| 60-min | -0.22% | 44% | 259 |
| to close | -0.14% | 43% | 259 |
| Middle 50% of ETNB reactions | -1.94% to +0.77% |
|---|---|
| Median reaction (30-min) | -0.13% |
| Measured reactions | 291 |
Half of all 89bio, Inc. news events land between -1.94% and +0.77% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How ETNB reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst downgrades | 13 | -0.03% | 39% | -0.60% |
| Coverage initiations | 11 | -0.26% | 36% | +3.68% |
| Rating reiterations | 77 | -0.24% | 38% | -0.20% |
| Price-target cuts | 13 | -0.52% | 31% | -1.71% |
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. 2 further classes were observed with fewer than 10 measured events and are not published. See how ETNB ranks against every other measured name →
That’s how ETNB usually reacts — get an email when it moves on news →Email me when ETNB moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to ETNB's baseline. Nothing else.
Recent ETNB events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 15-12G 89bio, Inc. | SEC filing · Form 15-12G | SEC EDGAR | — | — | |
| Form 8-K 89bio, Inc. For: Oct 30 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form POS AM 89bio, Inc. | SEC filing · Form POS | SEC EDGAR | — | — | |
| Form POSASR 89bio, Inc. | SEC filing · Form POSASR | SEC EDGAR | — | — | |
| Form S-8 POS 89bio, Inc. | SEC filing · Form S-8 | SEC EDGAR | — | — | |
| BRODSKY & SMITH SHAREHOLDER UPDATE: Notifying Investors of the Following Investigations: 89bio, Inc. (Nasdaq - ETNB), Barinthus Biotherapeutics plc (Nasdaq - BRNS), Verint Systems Inc. (Nasdaq - VRNT), Dayforce, Inc. (NYSE- DAY) | Press release | GlobeNewswire | +0.07% | -0.07% | |
| BRODSKY & SMITH SHAREHOLDER UPDATE: Notifying Investors of the Following Investigations: 89bio, Inc. (Nasdaq - ETNB), Barinthus Biotherapeutics plc (Nasdaq - BRNS), Verint Systems Inc. (Nasdaq - VRNT), Dayforce, Inc. (NYSE- DAY) | Press release | GlobeNewswire | +0.07% | -0.14% | |
| 89bio, Inc. Announces Agreement to be Acquired by Roche | Press release | GlobeNewswire | -0.07% | -0.13% | |
| ETNB Stock Alert: Halper Sadeh LLC Is Investigating Whether the Sale of 89bio, Inc. Is Fair to Shareholders | Press release | Business Wire | -0.07% | -0.13% | |
| Form 8-K 89bio, Inc. For: Sep 17 | SEC filing · Form 8-K | SEC EDGAR | -0.07% | -0.13% | |
| 89bio Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4) | Press release | GlobeNewswire | -1.69% | -3.71% | |
| 89bio to Participate in Upcoming Investor Conferences | Press release | GlobeNewswire | +0.42% | -4.14% | |
| Form 10-Q 89bio, Inc. For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | -3.49% | -4.26% | |
| 89bio Reports Second Quarter 2025 Financial Results and Corporate Updates | Press release | GlobeNewswire | +1.53% | +6.82% | |
| Form 8-K 89bio, Inc. For: Aug 07 | SEC filing · Form 8-K | SEC EDGAR | +1.53% | +6.82% | |
| 89bio Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4) | Press release | GlobeNewswire | -1.54% | +3.19% | |
| 89bio Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4) | Press release | GlobeNewswire | -1.73% | +0.84% | |
| 89bio Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4) | Press release | GlobeNewswire | -0.47% | +0.38% | |
| 89bio to Participate in Goldman Sachs 46th Annual Global Healthcare Conference | Press release | GlobeNewswire | -1.79% | -0.80% | |
| Form 8-K 89bio, Inc. For: May 28 | SEC filing · Form 8-K | SEC EDGAR | +3.84% | +2.12% | |
| 89bio Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4) | Press release | GlobeNewswire | +3.39% | -0.12% | |
| 89bio to Participate in Upcoming Investor Conferences | Press release | GlobeNewswire | -0.83% | -2.54% | |
| Form 10-Q 89bio, Inc. For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | -0.12% | -0.23% | |
| 89bio Reports First Quarter 2025 Financial Results and Corporate Updates | Press release | GlobeNewswire | +3.61% | +5.18% | |
| Form 8-K 89bio, Inc. For: May 01 | SEC filing · Form 8-K | SEC EDGAR | +3.61% | +5.18% | |
| Form ARS 89bio, Inc. For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | -1.75% | -2.00% | |
| Form DEF 14A 89bio, Inc. For: May 28 | SEC filing · Form DEF | SEC EDGAR | -1.75% | -2.00% | |
| Form DEFA14A 89bio, Inc. | SEC filing · Form DEFA14A | SEC EDGAR | -1.75% | -2.00% | |
| Form 8-K 89bio, Inc. For: Apr 09 | SEC filing · Form 8-K | SEC EDGAR | -1.55% | +22.43% | |
| 89bio to Participate in the Leerink Partners Global Healthcare Conference | Press release | GlobeNewswire | -1.02% | -3.75% | |
| 89bio Reports Fourth Quarter and Full Year 2024 Financial Results and Corporate Updates | Press release | GlobeNewswire | -6.28% | +1.65% | |
| Form 10-K 89bio, Inc. For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | -6.28% | +1.65% | |
| Form 8-K 89bio, Inc. For: Feb 27 | SEC filing · Form 8-K | SEC EDGAR | -6.28% | +1.65% | |
| Form S-8 89bio, Inc. | SEC filing · Form S-8 | SEC EDGAR | -6.28% | +1.65% | |
| 89bio Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4) | Press release | GlobeNewswire | +0.62% | +0.35% | |
| Form 8-K 89bio, Inc. For: Jan 31 | SEC filing · Form 8-K | SEC EDGAR | +0.61% | +8.97% | |
| 89bio Announces Closing of its Public Offering and Full Exercise of Underwriters’ Option to Purchase Additional Shares | Press release | GlobeNewswire | -0.53% | -2.00% | |
| Form 8-K 89bio, Inc. For: Jan 28 | SEC filing · Form 8-K | SEC EDGAR | +2.19% | +5.47% | |
| 89bio, Inc. Announces Pricing of $250.0 Million Public Offering of Common Stock and Pre-Funded Warrants | Press release | GlobeNewswire | -0.10% | -8.11% | |
| 89bio, Inc. Announces Proposed Underwritten Public Offering of Common Stock and Pre-Funded Warrants | Press release | GlobeNewswire | +1.78% | +0.11% | |
| 89bio Provides Business Update and Outlook for 2025 | Press release | GlobeNewswire | -2.57% | -4.68% | |
| Form 8-K 89bio, Inc. For: Jan 13 | SEC filing · Form 8-K | SEC EDGAR | -2.57% | -4.68% | |
| 89bio Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4) | Press release | GlobeNewswire | -3.41% | +12.95% | |
| Form 8-K 89bio, Inc. For: Dec 12 | SEC filing · Form 8-K | SEC EDGAR | -1.17% | +2.73% | |
| 89bio Announces Inducement Grants Under Nasdaq Listing Rule 5635(c)(4) | Press release | GlobeNewswire | — | +0.00% | |
| 89bio to Participate in the 7th Annual Evercore HealthCONx Conference | Press release | GlobeNewswire | +1.40% | +2.35% | |
| 89bio Presents New Analyses Evaluating Pegozafermin and Potential Benefit of Non-Invasive Tests from the ENLIVEN Phase 2b Trial in MASH Patients at AASLD The Liver Meeting® 2024 | Press release | GlobeNewswire | -1.70% | -10.39% | |
| Form 8-K 89bio, Inc. For: Nov 12 | SEC filing · Form 8-K | SEC EDGAR | -1.91% | -1.46% | |
| 89bio, Inc. Announces Proposed Underwritten Public Offering of Common Stock and Pre-Funded Warrants | Press release | GlobeNewswire | +7.52% | -2.14% | |
| 89bio, Inc. Announces Upsized Pricing of $125.0 Million Public Offering of Common Stock and Pre-Funded Warrants | Press release | GlobeNewswire | +7.52% | -2.14% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the ETNB section they belong to.
Where else ETNB is measured.
ETNB earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is 89bio, Inc.'s median reaction calculated?
Every labeled ETNB 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 291 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. 43% of ETNB'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 ETNB'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.