Algoma Steel Group Inc. - Common Shares (ASTL)
ASTL moved a median of 0.00% 30 minutes after news, and -0.21% by the close. How ASTL actually reacts to news — the realized, point-in-time move the market made, measured across 211 labeled events over the last three years with zero look-ahead.
ASTL’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 46% | 211 |
| 30-min | 0.00% | 49% | 211 |
| 60-min | -0.06% | 47% | 211 |
| to close | -0.21% | 45% | 211 |
| Middle 50% of ASTL reactions | -1.15% to +1.19% |
|---|---|
| Median reaction (30-min) | 0.00% |
| Measured reactions | 211 |
Half of all Algoma Steel Group Inc. - Common Shares news events land between -1.15% and +1.19% 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 ASTL moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to ASTL's baseline. Nothing else.
Recent ASTL events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 6-K Algoma Steel Group Inc. For: Oct 01 | SEC filing · Form 6-K | SEC EDGAR | +0.37% | +7.43% | |
| Algoma Steel Group Inc. Provides Guidance for the Third Quarter 2026 | Press release | GlobeNewswire | +0.37% | +7.43% | |
| Form 6-K Algoma Steel Group Inc. For: Sep 02 | SEC filing · Form 6-K | SEC EDGAR | -0.12% | +1.91% | |
| Algoma Steel Group Inc. Provides Update on Lake Superior Power Plant Outage | Press release | GlobeNewswire | +1.91% | +5.92% | |
| Form 6-K Algoma Steel Group Inc. For: Sep 02 | SEC filing · Form 6-K | SEC EDGAR | +1.91% | +5.92% | |
| Form 6-K Algoma Steel Group Inc. For: Aug 17 | SEC filing · Form 6-K | SEC EDGAR | -1.94% | -0.97% | |
| Algoma Steel Group Inc. Reports Unplanned Outage at Lake Superior Power Plant | Press release | GlobeNewswire | -2.59% | -1.89% | |
| Canadian Investment Regulatory Organization Trade Resumption - ASTL | Press release | Canada Newswire | -2.59% | -1.89% | |
| Canadian Investment Regulatory Organization Trading Halt - ASTL | Press release | Canada Newswire | -2.59% | -1.89% | |
| Form 6-K Algoma Steel Group Inc. For: Jun 30 | SEC filing · Form 6-K | SEC EDGAR | -4.94% | -5.31% | |
| Algoma Steel Group Inc. Reports Financial Results for the Three Months Ended June 30, 2026 | Press release | GlobeNewswire | -4.94% | -5.31% | |
| Form 6-K Algoma Steel Group Inc. For: Jul 16 | SEC filing · Form 6-K | SEC EDGAR | +0.00% | +4.64% | |
| Algoma Steel Group Inc. to Announce 2026 Second Quarter Results July 29, 2026 | Press release | GlobeNewswire | +0.00% | +4.64% | |
| Form 6-K Algoma Steel Group Inc. For: Jun 30 | SEC filing · Form 6-K | SEC EDGAR | +0.12% | -4.96% | |
| Algoma Steel Group Inc. Provides Guidance for the Second Quarter 2026 | Press release | GlobeNewswire | +0.12% | -4.96% | |
| Form 6-K Algoma Steel Group Inc. For: Jun 23 | SEC filing · Form 6-K | SEC EDGAR | -1.21% | -3.39% | |
| Algoma Steel Group Inc. Announces Results of Voting at Annual Meeting of Shareholders | Press release | GlobeNewswire | -1.21% | -3.39% | |
| Form 6-K Algoma Steel Group Inc. For: Jun 04 | SEC filing · Form 6-K | SEC EDGAR | -1.85% | -8.15% | |
| Algoma Steel Releases 2025 Sustainability Report | Press release | GlobeNewswire | -1.85% | -8.15% | |
| Form 6-K Algoma Steel Group Inc. For: May 22 | SEC filing · Form 6-K | SEC EDGAR | +0.63% | -0.21% | |
| Form 6-K Algoma Steel Group Inc. For: May 12 | SEC filing · Form 6-K | SEC EDGAR | +3.64% | +7.07% | |
| Algoma Steel Group Inc. Reports Financial Results for the Three Months Ended March 31, 2026 | Press release | GlobeNewswire | +3.64% | +7.07% | |
| Form 6-K Algoma Steel Group Inc. For: Apr 30 | SEC filing · Form 6-K | SEC EDGAR | -0.34% | +1.37% | |
| Algoma Steel Group Inc. to Announce 2026 First Quarter Results May 12, 2026 | Press release | GlobeNewswire | +0.85% | +2.55% | |
| Form 6-K Algoma Steel Group Inc. For: Apr 10 | SEC filing · Form 6-K | SEC EDGAR | +1.71% | +7.28% | |
| Form 6-K Algoma Steel Group Inc. For: Apr 07 | SEC filing · Form 6-K | SEC EDGAR | +1.32% | +0.88% | |
| Roshel Algoma Defence Partnership to Strengthen Canada’s Defence Industrial Base | Press release | GlobeNewswire | +1.15% | +1.50% | |
| Form 6-K Algoma Steel Group Inc. For: Mar 31 | SEC filing · Form 6-K | SEC EDGAR | -0.47% | -3.52% | |
| Algoma Steel Group Inc. Provides Guidance for the First Quarter 2026 | Press release | GlobeNewswire | -0.47% | -3.52% | |
| Form 40-F Algoma Steel Group Inc. For: Dec 31 | SEC filing · Form 40-F | SEC EDGAR | -0.12% | -10.44% | |
| Form 6-K Algoma Steel Group Inc. For: Mar 11 | SEC filing · Form 6-K | SEC EDGAR | -0.12% | -10.44% | |
| Algoma Steel Group Inc. Reports Financial Results for the Three and Twelve Months Ended December 31, 2025 | Press release | GlobeNewswire | -0.12% | -10.44% | |
| Form 6-K Algoma Steel Group Inc. For: Feb 26 | SEC filing · Form 6-K | SEC EDGAR | +0.11% | -1.50% | |
| Algoma Steel Group Inc. to Announce 2025 Fourth Quarter and Full Year Results March 11, 2026 | Press release | GlobeNewswire | +0.11% | -1.50% | |
| Form 6-K Algoma Steel Group Inc. For: Jan 26 | SEC filing · Form 6-K | SEC EDGAR | +2.09% | +5.80% | |
| Algoma Steel and Hanwha Ocean Sign Binding Memorandum of Understanding (MOU) for Long-term Strategic Arrangement supporting Canadian Patrol Submarine Project | Press release | GlobeNewswire | +4.89% | +0.00% | |
| Form 6-K Algoma Steel Group Inc. For: Jan 08 | SEC filing · Form 6-K | SEC EDGAR | -0.24% | +0.47% | |
| Algoma Steel Provides Guidance for the Fourth Quarter of 2025 | Press release | GlobeNewswire | -0.24% | +0.47% | |
| Form 6-K Algoma Steel Group Inc. For: Dec 02 | SEC filing · Form 6-K | SEC EDGAR | +0.51% | +3.04% | |
| Form 6-K Algoma Steel Group Inc. For: Dec 01 | SEC filing · Form 6-K | SEC EDGAR | -1.42% | -7.82% | |
| Algoma Steel Completes $500 Million Government Financing Transaction | Press release | GlobeNewswire | +0.14% | -1.69% | |
| Form 6-K Algoma Steel Group Inc. For: Nov 17 | SEC filing · Form 6-K | SEC EDGAR | +0.14% | -1.69% | |
| Form 6-K Algoma Steel Group Inc. For: Oct 29 | SEC filing · Form 6-K | SEC EDGAR | -5.69% | -1.24% | |
| Algoma Steel Group Reports Financial Results for the Third Quarter 2025 | Press release | GlobeNewswire | -5.69% | -1.24% | |
| Algoma Steel Group, Inc. Announces Leadership Transition | Press release | GlobeNewswire | -5.69% | -1.24% | |
| Form 6-K Algoma Steel Group Inc. For: Oct 20 | SEC filing · Form 6-K | SEC EDGAR | +0.10% | +9.85% | |
| Algoma Steel Group Inc. to Announce 2025 Third Quarter Results October 29, 2025 | Press release | GlobeNewswire | +0.10% | +9.85% | |
| Form 6-K Algoma Steel Group Inc. For: Oct 01 | SEC filing · Form 6-K | SEC EDGAR | -6.42% | -2.45% | |
| Algoma Steel Provides Guidance for the Third Quarter 2025 and Announces Board Update | Press release | GlobeNewswire | -6.42% | -2.45% | |
| Algoma Steel Secures C$500 Million Liquidity Support from Governments of Canada and Ontario | Press release | GlobeNewswire | +7.16% | -2.39% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the ASTL section they belong to.
Where else ASTL is measured.
ASTL earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is Algoma Steel Group Inc. - Common Shares's median reaction calculated?
Every labeled ASTL 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 211 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. 49% of ASTL'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 ASTL'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.