American Superconductor Corporation (AMSC)
AMSC moved a median of +0.49% 30 minutes after news, and +0.41% by the close. How AMSC actually reacts to news — the realized, point-in-time move the market made, measured across 185 labeled events over the last three years with zero look-ahead.
AMSC’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 49% | 185 |
| 30-min | +0.49% | 58% | 185 |
| 60-min | +0.29% | 55% | 185 |
| to close | +0.41% | 54% | 185 |
| Middle 50% of AMSC reactions | -1.44% to +1.64% |
|---|---|
| Median reaction (30-min) | +0.49% |
| Measured reactions | 185 |
Half of all American Superconductor Corporation news events land between -1.44% and +1.64% 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 AMSC moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to AMSC's baseline. Nothing else.
Recent AMSC events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 8-K AMERICAN SUPERCONDUCTOR For: Sep 17 | SEC filing · Form 8-K | SEC EDGAR | +1.16% | +3.31% | |
| AMSC Reports First Quarter Fiscal Year 2026 Financial Results and Business Outlook | Press release | GlobeNewswire | +2.41% | +11.00% | |
| Form 10-Q AMERICAN SUPERCONDUCTOR For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +2.41% | +11.00% | |
| Form 8-K AMERICAN SUPERCONDUCTOR For: Jul 31 | SEC filing · Form 8-K | SEC EDGAR | +2.41% | +11.00% | |
| AMSC to Report First Quarter Fiscal Year 2026 Financial Results on August 5, 2026 | Press release | GlobeNewswire | +0.00% | -1.11% | |
| AMSC Secures $25 Million Turnkey Contract for Large-Scale Mining Development | Press release | GlobeNewswire | -2.47% | -3.39% | |
| Form ARS AMERICAN SUPERCONDUCTOR For: Mar 31 | SEC filing · Form ARS | SEC EDGAR | +0.95% | +3.96% | |
| Form DEF 14A AMERICAN SUPERCONDUCTOR For: Jul 31 | SEC filing · Form DEF | SEC EDGAR | +0.95% | +3.96% | |
| Form DEFA14A AMERICAN SUPERCONDUCTOR | SEC filing · Form DEFA14A | SEC EDGAR | +0.95% | +3.96% | |
| Form 8-K AMERICAN SUPERCONDUCTOR For: Jun 01 | SEC filing · Form 8-K | SEC EDGAR | -5.35% | -8.47% | |
| Form SD AMERICAN SUPERCONDUCTOR | SEC filing · Form SD | SEC EDGAR | +3.80% | +3.86% | |
| AMSC Reports Fourth Quarter and Fiscal Year 2025 Financial Results and Business Outlook | Press release | GlobeNewswire | -4.02% | +2.66% | |
| Form 10-K AMERICAN SUPERCONDUCTOR For: Mar 31 | SEC filing · Form 10-K | SEC EDGAR | -4.02% | +2.66% | |
| Form 8-K AMERICAN SUPERCONDUCTOR For: May 27 | SEC filing · Form 8-K | SEC EDGAR | -4.02% | +2.66% | |
| AMSC to Report Fourth Quarter and Fiscal Year 2025 Financial Results on May 27, 2026 | Press release | GlobeNewswire | -2.13% | +3.10% | |
| Form 8-K/A AMERICAN SUPERCONDUCTOR For: Dec 05 | SEC filing · Form 8-K | SEC EDGAR | -1.52% | -7.00% | |
| AMSC Reports Third Quarter Fiscal Year 2025 Financial Results and Business Outlook | Press release | GlobeNewswire | -7.23% | -18.11% | |
| Form 10-Q AMERICAN SUPERCONDUCTOR For: Dec 31 | SEC filing · Form 10-Q | SEC EDGAR | -7.23% | -18.11% | |
| Form 8-K AMERICAN SUPERCONDUCTOR For: Feb 04 | SEC filing · Form 8-K | SEC EDGAR | -7.23% | -18.11% | |
| AMSC to Report Third Quarter Fiscal Year 2025 Financial Results on February 4, 2026 | Press release | GlobeNewswire | +0.08% | +1.80% | |
| Form 8-K AMERICAN SUPERCONDUCTOR For: Dec 23 | SEC filing · Form 8-K | SEC EDGAR | +0.03% | -0.54% | |
| AMSC Accelerates the Business, Expands Product Portfolio, and Enters Brazil with Comtrafo Acquisition | Press release | GlobeNewswire | -2.01% | -1.71% | |
| Form 8-K AMERICAN SUPERCONDUCTOR For: Dec 05 | SEC filing · Form 8-K | SEC EDGAR | -2.01% | -1.71% | |
| AMSC Reports Second Quarter Fiscal Year 2025 Financial Results and Business Outlook | Press release | GlobeNewswire | -3.20% | -14.02% | |
| Form 10-Q AMERICAN SUPERCONDUCTOR For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | -3.20% | -14.02% | |
| Form 8-K AMERICAN SUPERCONDUCTOR For: Nov 05 | SEC filing · Form 8-K | SEC EDGAR | -3.20% | -14.02% | |
| AMSC to Report Second Quarter Fiscal Year 2025 Financial Results on November 5, 2025 | Press release | GlobeNewswire | -1.57% | +1.47% | |
| AMSC Reports First Quarter Fiscal Year 2025 Financial Results and Business Outlook | Press release | GlobeNewswire | +9.48% | +18.93% | |
| Form 10-Q AMERICAN SUPERCONDUCTOR For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +9.48% | +18.93% | |
| Form 8-K AMERICAN SUPERCONDUCTOR For: Jul 30 | SEC filing · Form 8-K | SEC EDGAR | +9.48% | +18.93% | |
| Form 8-K AMERICAN SUPERCONDUCTOR For: Jul 25 | SEC filing · Form 8-K | SEC EDGAR | +1.31% | +0.90% | |
| AMSC to Report First Quarter Fiscal Year 2025 Financial Results on July 30, 2025 | Press release | GlobeNewswire | +0.31% | -0.69% | |
| Form ARS AMERICAN SUPERCONDUCTOR For: Mar 31 | SEC filing · Form ARS | SEC EDGAR | -0.07% | -1.27% | |
| Form DEF 14A AMERICAN SUPERCONDUCTOR For: Jul 25 | SEC filing · Form DEF | SEC EDGAR | -0.07% | -1.27% | |
| Form DEFA14A AMERICAN SUPERCONDUCTOR | SEC filing · Form DEFA14A | SEC EDGAR | -0.07% | -1.27% | |
| AMSC Announces Pricing of $115 Million Public Offering of Common Stock | Press release | GlobeNewswire | -0.99% | +3.71% | |
| Form 8-K AMERICAN SUPERCONDUCTOR For: Jun 10 | SEC filing · Form 8-K | SEC EDGAR | +1.25% | -0.98% | |
| AMSC Announces Proposed Public Offering of Common Stock | Press release | GlobeNewswire | -0.99% | +3.71% | |
| AMSC Reports Fourth Quarter and Fiscal Year 2024 Financial Results and Business Outlook | Press release | GlobeNewswire | -8.08% | -0.28% | |
| Form 10-K AMERICAN SUPERCONDUCTOR For: Mar 31 | SEC filing · Form 10-K | SEC EDGAR | -8.08% | -0.28% | |
| Form 8-K AMERICAN SUPERCONDUCTOR For: May 15 | SEC filing · Form 8-K | SEC EDGAR | -8.08% | -0.28% | |
| Form SD AMERICAN SUPERCONDUCTOR | SEC filing · Form SD | SEC EDGAR | -8.08% | -0.28% | |
| AMSC to Report Fourth Quarter and Fiscal Year 2024 Financial Results on May 21, 2025 | Press release | GlobeNewswire | +0.38% | +2.00% | |
| AMSC Reports Third Quarter Fiscal Year 2024 Financial Results and Provides Business Outlook | Press release | GlobeNewswire | +9.05% | +22.29% | |
| Form 10-Q AMERICAN SUPERCONDUCTOR For: Dec 31 | SEC filing · Form 10-Q | SEC EDGAR | +9.05% | +22.29% | |
| Form 8-K AMERICAN SUPERCONDUCTOR For: Jan 30 | SEC filing · Form 8-K | SEC EDGAR | +9.05% | +22.29% | |
| AMSC to Report Third Quarter Fiscal Year 2024 Financial Results on February 5, 2025 | Press release | GlobeNewswire | +0.77% | -4.19% | |
| AMSC Reports Second Quarter Fiscal Year 2024 Financial Results and Provides Business Outlook | Press release | GlobeNewswire | -5.26% | +0.08% | |
| Form 10-Q AMERICAN SUPERCONDUCTOR For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | -5.26% | +0.08% | |
| Form 8-K AMERICAN SUPERCONDUCTOR For: Oct 30 | SEC filing · Form 8-K | SEC EDGAR | -5.26% | +0.08% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the AMSC section they belong to.
Where else AMSC is measured.
AMSC earnings → · Analyst actions → · SEC filings →
Other Technology names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Energous Corporation (WATT) | 188 | 0.00% | 46% |
| Sono-Tek Corporation (SOTK) | 187 | +0.00% | 51% |
| DZS INC (DZSI) | 185 | 0.00% | 24% |
| CSP Inc. (CSPI) | 184 | +0.59% | 56% |
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.
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How the numbers are made.
How is American Superconductor Corporation's median reaction calculated?
Every labeled AMSC 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 185 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. 58% of AMSC'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 AMSC'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.