Aeterna Zentaris Inc. (AEZS)
How AEZS actually reacts to news — the realized, point-in-time move the market made, measured across 71 labeled events over the last three years with zero look-ahead.
AEZS’s median reaction, across the day.
Half of all Aeterna Zentaris Inc. news events land between -0.77% and +2.63% at 30 minutes.
Reaction stats as of 2026-08-18. Reaction = percent move vs. the price at the news timestamp.
Email me when AEZS moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to AEZS’s baseline. Nothing else.
Get “How AEZS reacts to news” as a PDF.
A free one-page summary: AEZS’s median reaction to news and the full breakdown by event type — the numbers on this page, in one page.
Recent AEZS events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 6-K COSCIENS Biopharma Inc. For: Aug 27 | SEC filing · Form 6-K | SEC EDGAR | — | — | |
| Form 6-K COSCIENS Biopharma Inc. For: Aug 13 | SEC filing · Form 6-K | SEC EDGAR | — | — | |
| Form 6-K COSCIENS Biopharma Inc. For: Jun 30 | SEC filing · Form 6-K | SEC EDGAR | — | — | |
| Form 6-K Aeterna Zentaris Inc. For: Aug 06 | SEC filing · Form 6-K | SEC EDGAR | — | +2.66% | |
| Aeterna Zentaris Inc. Announces Name Change to COSCIENS Biopharma Inc. | Press release | GlobeNewswire | — | +2.66% | |
| Form 20-F/A Aeterna Zentaris Inc. For: Dec 31 | SEC filing · Form 20-F | SEC EDGAR | — | -1.11% | |
| Form 6-K Aeterna Zentaris Inc. For: Jul 16 | SEC filing · Form 6-K | SEC EDGAR | — | -1.11% | |
| Aeterna Zentaris Announces Results of Virtual 2024 Meeting of Shareholders | Press release | GlobeNewswire | — | -1.11% | |
| Form 6-K Aeterna Zentaris Inc. For: Jun 25 | SEC filing · Form 6-K | SEC EDGAR | — | +0.00% | |
| Aeterna Zentaris Announces Last Patient Last Visit in Pivotal DETECT-Trial for the Diagnosis of Childhood-Onset Growth Hormone Deficiency | Press release | GlobeNewswire | — | -0.88% | |
| Form 6-K Aeterna Zentaris Inc. For: Jun 13 | SEC filing · Form 6-K | SEC EDGAR | — | -0.88% | |
| Form 6-K Aeterna Zentaris Inc. For: Jun 10 | SEC filing · Form 6-K | SEC EDGAR | — | -0.07% | |
| Form EFFECT Aeterna Zentaris Inc. | SEC filing · Form EFFECT | SEC EDGAR | -5.41% | -2.01% | |
| Aeterna Zentaris and Ceapro Complete Merger Transaction | Press release | GlobeNewswire | — | -8.52% | |
| Form POS AM Aeterna Zentaris Inc. | SEC filing · Form POS | SEC EDGAR | +0.00% | -2.91% | |
| Form S-8 Aeterna Zentaris Inc. | SEC filing · Form S-8 | SEC EDGAR | +0.00% | -2.91% | |
| Form 6-K/A Aeterna Zentaris Inc. For: May 29 | SEC filing · Form 6-K | SEC EDGAR | +0.00% | -4.33% | |
| Aeterna Zentaris Provides Update on Timing for Annual Meeting of Shareholders and Due Bill Redemption Date | Press release | GlobeNewswire | +0.00% | -4.33% | |
| Aeterna Zentaris Announces Details Regarding Transaction with Ceapro | Press release | GlobeNewswire | — | +0.23% | |
| Form 6-K Aeterna Zentaris Inc. For: May 17 | SEC filing · Form 6-K | SEC EDGAR | — | +0.23% | |
| Form EFFECT Aeterna Zentaris Inc. | SEC filing · Form EFFECT | SEC EDGAR | — | +0.23% | |
| Form 6-K Aeterna Zentaris Inc. For: Mar 31 | SEC filing · Form 6-K | SEC EDGAR | — | +1.49% | |
| Form 6-K Aeterna Zentaris Inc. For: May 14 | SEC filing · Form 6-K | SEC EDGAR | +1.65% | +2.92% | |
| Aeterna Zentaris Reports First Quarter 2024 Financial Results | Press release | GlobeNewswire | +1.65% | +2.92% | |
| Form 6-K Aeterna Zentaris Inc. For: May 13 | SEC filing · Form 6-K | SEC EDGAR | — | +2.93% | |
| Form F-1/A Aeterna Zentaris Inc. | SEC filing · Form F-1 | SEC EDGAR | — | +2.93% | |
| Form 6-K Aeterna Zentaris Inc. For: May 08 | SEC filing · Form 6-K | SEC EDGAR | — | -0.63% | |
| Aeterna Zentaris Announces Effective Date of Share Consolidation | Press release | GlobeNewswire | +1.03% | +7.18% | |
| Form 6-K Aeterna Zentaris Inc. For: May 01 | SEC filing · Form 6-K | SEC EDGAR | -4.21% | -6.08% | |
| Form F-1/A Aeterna Zentaris Inc. | SEC filing · Form F-1 | SEC EDGAR | +0.00% | +0.00% | |
| Ceapro Receives Final Court Approval for Merger with Aeterna Zentaris | Press release | GlobeNewswire | +4.95% | +8.42% | |
| Form 6-K Aeterna Zentaris Inc. For: Feb 29 | SEC filing · Form 6-K | SEC EDGAR | — | +8.42% | |
| Aeterna Zentaris Reports Fourth Quarter and Full Year 2023 Financial Results and Announces Completion of Enrollment in Ongoing Pivotal DETECT-Trial for the Diagnosis of Childhood-Onset Growth Hormone Deficiency | Press release | GlobeNewswire | +6.09% | +5.58% | |
| Form 20-F Aeterna Zentaris Inc. For: Dec 31 | SEC filing · Form 20-F | SEC EDGAR | +6.09% | +5.58% | |
| Form 6-K Aeterna Zentaris Inc. For: Mar 27 | SEC filing · Form 6-K | SEC EDGAR | +6.09% | +5.58% | |
| Form 6-K Aeterna Zentaris Inc. For: Feb 29 | SEC filing · Form 6-K | SEC EDGAR | +0.50% | +2.25% | |
| Aeterna Zentaris and Ceapro Merger Approved by Securityholders at Special Meetings | Press release | GlobeNewswire | +15.04% | +6.68% | |
| Form 6-K Aeterna Zentaris Inc. For: Feb 26 | SEC filing · Form 6-K | SEC EDGAR | — | -2.05% | |
| Leading Independent Proxy Advisory Firm ISS Recommends Aeterna Zentaris and Ceapro Securityholders Vote FOR the Arrangement Agreement to Approve the Merger of Equals to Create a Diversified Biopharmaceutical Company | Press release | GlobeNewswire | +1.06% | +3.72% | |
| Form 6-K Aeterna Zentaris Inc. For: Feb 16 | SEC filing · Form 6-K | SEC EDGAR | -2.73% | -4.15% | |
| Aeterna Zentaris Issues Letter to Shareholders and Management Proxy Circular Ahead of Special Meeting of Shareholders to Approve Merger of Equals with Ceapro | Press release | GlobeNewswire | — | -1.43% | |
| Form 20-F/A Aeterna Zentaris Inc. For: Dec 31 | SEC filing · Form 20-F | SEC EDGAR | — | -1.52% | |
| Form F-1 Aeterna Zentaris Inc. | SEC filing · Form F-1 | SEC EDGAR | — | -1.43% | |
| Form 6-K Aeterna Zentaris Inc. For: Dec 21 | SEC filing · Form 6-K | SEC EDGAR | — | +2.07% | |
| Form 6-K/A Aeterna Zentaris Inc. For: Dec 22 | SEC filing · Form 6-K | SEC EDGAR | +0.00% | -3.70% | |
| SHAREHOLDER INVESTIGATION: Halper Sadeh LLC Investigates CVLY, EVFM, AEZS, HOLI | Press release | PR Newswire | — | -3.27% | |
| Aeterna Zentaris and Ceapro Announce Merger of Equals to Create a Diversified Biopharmaceutical Company | Press release | GlobeNewswire | -3.97% | -2.68% | |
| AEZS Stock Alert: Halper Sadeh LLC Is Investigating Whether the Merger of Aeterna Zentaris Inc. Is Fair to Shareholders | Press release | Business Wire | -3.97% | -2.68% | |
| Form 6-K Aeterna Zentaris Inc. For: Dec 14 | SEC filing · Form 6-K | SEC EDGAR | -3.97% | -2.68% | |
| Aeterna Zentaris Reports Third Quarter 2023 Financial Results | Press release | GlobeNewswire | — | +3.36% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the AEZS section they belong to.
More of the dataset.
AEZS earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is Aeterna Zentaris Inc.'s median reaction calculated?
Every labeled AEZS 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 71 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. 53% of AEZS'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 2026-08-18.
Does AEZS'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.