Aurora Cannabis Inc. - Common Shares (ACB)
ACB moved a median of -0.18% 30 minutes after news, and 0.00% by the close. How ACB actually reacts to news — the realized, point-in-time move the market made, measured across 354 labeled events over the last three years with zero look-ahead.
ACB’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | -0.26% | 39% | 348 |
| 30-min | -0.18% | 47% | 349 |
| 60-min | +0.12% | 53% | 349 |
| to close | 0.00% | 50% | 347 |
| Middle 50% of ACB reactions | -1.85% to +1.05% |
|---|---|
| Median reaction (30-min) | -0.18% |
| Measured reactions | 354 |
Half of all Aurora Cannabis Inc. - Common Shares news events land between -1.85% and +1.05% 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 ACB moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to ACB's baseline. Nothing else.
Recent ACB events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Aurora Completes Major Expansion of European EU-GMP Manufacturing Facility, More Than Doubling Expected Annual Flower Output | Press release | Canada Newswire | -0.56% | -0.45% | |
| Form 6-K AURORA CANNABIS INC For: Oct 08 | SEC filing · Form 6-K | SEC EDGAR | -0.56% | -0.45% | |
| Form 6-K AURORA CANNABIS INC For: Oct 06 | SEC filing · Form 6-K | SEC EDGAR | +0.44% | -2.83% | |
| Aurora Urges Shareholders to Take No Action to Revised Hostile Bid by Curaleaf as Formal Review Underway | Press release | Canada Newswire | +0.44% | -2.83% | |
| Form 6-K AURORA CANNABIS INC For: Oct 05 | SEC filing · Form 6-K | SEC EDGAR | -1.10% | +0.88% | |
| Aurora Maintains Shareholder Recommendation to Take No Action at this Time as Curaleaf Has Yet to File Their Revised Hostile Bid | Press release | Canada Newswire | -1.10% | +0.88% | |
| Form 6-K AURORA CANNABIS INC For: Sep 23 | SEC filing · Form 6-K | SEC EDGAR | +0.97% | +0.73% | |
| Aurora Cannabis Files Application with Alberta Securities Commission to Protect Company Shareholders Having Identified Several Deficiencies in Curaleaf's Hostile Bid Disclosure | Press release | Canada Newswire | +0.97% | +0.73% | |
| Aurora Cannabis Provides Business Update; Accretive Acquisition of Safari Flower Company and Leading European Performance Expected to Fuel International Growth in the Fiscal Second Quarter 2027 and Beyond | Press release | Canada Newswire | +0.52% | +0.26% | |
| Form 6-K AURORA CANNABIS INC For: Sep 16 | SEC filing · Form 6-K | SEC EDGAR | +0.52% | +0.26% | |
| Aurora Cannabis Refutes Curaleaf's Latest Attempt To Distract Shareholders From The Facts | Press release | Canada Newswire | -0.03% | -0.68% | |
| Form 6-K AURORA CANNABIS INC For: Sep 14 | SEC filing · Form 6-K | SEC EDGAR | +0.13% | -0.39% | |
| Form 6-K AURORA CANNABIS INC For: Sep 02 | SEC filing · Form 6-K | SEC EDGAR | +0.27% | +0.40% | |
| Aurora Appoints Seasoned Biopharmaceutical Executive to Lead Commercial Acceleration of Global Medical Cannabis Business | Press release | Canada Newswire | -0.39% | +0.78% | |
| Form 6-K AURORA CANNABIS INC For: Sep 09 | SEC filing · Form 6-K | SEC EDGAR | -0.39% | +0.78% | |
| Aurora Cannabis Urges Shareholders to REJECT Curaleaf's Hostile Bid, Warning that it is Inadequate, Undervalues Aurora and Puts Shareholder Value and Future Upside at Risk | Press release | Canada Newswire | +1.50% | +0.25% | |
| Curaleaf Responds to Aurora Circular; Reaffirms Offer as the Best Path to Value Creation for Shareholders | Press release | Canada Newswire | -0.37% | -0.25% | |
| Form 6-K AURORA CANNABIS INC For: Sep 02 | SEC filing · Form 6-K | SEC EDGAR | +1.50% | +0.25% | |
| AURORA CANNABIS CORRECTS INACCURATE STATEMENTS MADE IN SUPPORT OF CURALEAF HOLDINGS' HOSTILE BID | Press release | Canada Newswire | -0.26% | +0.77% | |
| Curaleaf Responds to Aurora Cannabis' Latest Attempt to Deflect From Shareholder Value Creation | Press release | Canada Newswire | -0.75% | -1.25% | |
| Form 6-K AURORA CANNABIS INC For: Aug 24 | SEC filing · Form 6-K | SEC EDGAR | -0.26% | +0.77% | |
| Aurora Cannabis Furthers Global Medical Cannabis Growth with Accretive Acquisition of Internode Pharma Limited and HAP Pharma Limited, Expanding Distribution Access to the UK Medical Cannabis Market | Press release | Canada Newswire | +0.40% | +2.90% | |
| AURORA CANNABIS INC. URGES SHAREHOLDERS TO TAKE NO ACTION AT THIS TIME IN RESPECT TO THE UNSOLICITED TAKE-OVER BID BY CURALEAF HOLDINGS, INC. | Press release | Canada Newswire | +0.57% | +6.25% | |
| Form 6-K AURORA CANNABIS INC For: Aug 19 | SEC filing · Form 6-K | SEC EDGAR | +0.57% | +6.25% | |
| Form 6-K AURORA CANNABIS INC For: Aug 13 | SEC filing · Form 6-K | SEC EDGAR | -0.26% | -1.30% | |
| AURORA CANNABIS INC. RESPONDS TO PRESS RELEASE OF CURALEAF HOLDINGS, INC. REGARDING INTENTION TO LAUNCH UNSOLICITED TAKE-OVER BID | Press release | Canada Newswire | — | +0.00% | |
| Canadian Investment Regulatory Organization Trade Resumption - ACB | Press release | Canada Newswire | — | +0.00% | |
| Canadian Investment Regulatory Organization Trading Halt - ACB | Press release | Canada Newswire | — | +0.00% | |
| Curaleaf Announces Intention to Launch Take-Over Bid for Aurora Cannabis to Solidify its Position as the Global Cannabis Industry Leader | Press release | Canada Newswire | +0.00% | +4.66% | |
| Form 6-K AURORA CANNABIS INC For: Aug 11 | SEC filing · Form 6-K | SEC EDGAR | — | +0.00% | |
| Aurora, a Global Leader in Medical Cannabis, Announces Results of 2026 Annual General Meeting | Press release | PR Newswire | +0.33% | — | |
| Form 6-K AURORA CANNABIS INC For: Aug 10 | SEC filing · Form 6-K | SEC EDGAR | +0.33% | — | |
| Aurora Cannabis Announces Fiscal 2027 First Quarter Results | Press release | Canada Newswire | +1.09% | +5.82% | |
| Form 6-K AURORA CANNABIS INC For: Aug 05 | SEC filing · Form 6-K | SEC EDGAR | +1.09% | +5.82% | |
| Form 6-K AURORA CANNABIS INC For: Jun 30 | SEC filing · Form 6-K | SEC EDGAR | +1.09% | +5.82% | |
| Aurora Receives Support from Leading Independent Proxy Adviser Institutional Shareholder Services Inc. for the 2026 Annual General Meeting of Shareholders | Press release | Canada Newswire | +0.74% | +1.48% | |
| Form 6-K AURORA CANNABIS INC For: Jul 27 | SEC filing · Form 6-K | SEC EDGAR | +0.74% | +1.48% | |
| Form 6-K AURORA CANNABIS INC For: Jul 22 | SEC filing · Form 6-K | SEC EDGAR | +0.19% | +1.51% | |
| Form 6-K AURORA CANNABIS INC For: Jul 23 | SEC filing · Form 6-K | SEC EDGAR | +0.19% | +1.51% | |
| Safari Flower Company, a Wholly Owned Subsidiary of Aurora Cannabis, Receives EU-GMP Certification at Niagara Facility | Press release | Canada Newswire | +0.19% | +1.51% | |
| Aurora Cannabis to Host First Quarter 2027 Investor Conference Call | Press release | Canada Newswire | +0.19% | +1.51% | |
| Aurora Named to TIME Canada's Best Companies 2026 List | Press release | Canada Newswire | +0.18% | +0.37% | |
| Form 6-K AURORA CANNABIS INC For: Jul 08 | SEC filing · Form 6-K | SEC EDGAR | +0.75% | +0.75% | |
| Form 6-K AURORA CANNABIS INC For: Jul 09 | SEC filing · Form 6-K | SEC EDGAR | +0.18% | +0.37% | |
| Aurora Cannabis Inc. Announces Filing and Mailing of the Management Information Circular in Connection with the Annual General Meeting of Shareholders | Press release | Canada Newswire | +0.95% | +1.51% | |
| Form 6-K AURORA CANNABIS INC For: Jul 08 | SEC filing · Form 6-K | SEC EDGAR | +0.95% | +1.51% | |
| Aurora Cannabis Announces Full Year and Fiscal 2026 Fourth Quarter Results with Record Annual Revenue and Adjusted EBITDA¹ | Press release | Canada Newswire | -8.04% | -0.96% | |
| Form 40-F AURORA CANNABIS INC For: Mar 31 | SEC filing · Form 40-F | SEC EDGAR | -8.04% | -0.96% | |
| Form 6-K AURORA CANNABIS INC For: Jun 11 | SEC filing · Form 6-K | SEC EDGAR | -8.04% | -0.96% | |
| Aurora Deepens its Impact for Veterans Across Canada | Press release | Canada Newswire | -2.47% | -3.57% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the ACB section they belong to.
Where else ACB is measured.
ACB earnings → · Analyst actions → · SEC filings →
Other Healthcare names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| McKesson Corporation (MCK) | 355 | +0.02% | 53% |
| Owens & Minor, Inc. (OMI) | 355 | -0.48% | 34% |
| Avid Bioservices, Inc. (CDMO) | 354 | 0.00% | 49% |
| Celcuity Inc. (CELC) | 354 | +0.13% | 52% |
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 Aurora Cannabis Inc. - Common Shares's median reaction calculated?
Every labeled ACB 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 354 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. 47% of ACB'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 ACB'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.