# American Superconductor Corp: filings

AMSC · Nasdaq · CIK 880807 · [Technology](/sectors/technology.md) · fiscal year ends Mar 31

Pages: [Overview](/companies/amsc.md) · [Financials](/companies/amsc/financials.md) · [Filings](/companies/amsc/filings.md) · [Insiders](/companies/amsc/insiders.md)

## Reports and events: 301 filings

Newest first, by EDGAR acceptance time (Eastern). Filter with ?form= one of: `periodic`, `8-K`, `10-K`, `10-Q`, `4`, `proxy`, `13dg`, `all`, or any form this company filed (4 356, 8-K 194, 10-Q 53, SC 13G/A 43, 144 29, SC 13G 24, CT ORDER 23, 424B5 19, DEF 14A 19, 10-K 18, DEFA14A 18, SD 13, 3 12, ARS 11, EFFECT 11, S-8 8, S-3 7, SCHEDULE 13G/A 7, 4/A 6, 8-K/A 6, S-8 POS 6, CORRESP 5, 5 4, PRE 14A 4, SC 13D/A 4, 10-K/A 3, 424B7 3, POS AM 3, S-3ASR 3, UPLOAD 3, 10-Q/A 2, 3/A 2, 424B3 2, 424B2 1, D 1, NT 10-K 1, NT 10-Q 1, POSASR 1, S-1 1, S-3/A 1, SC 13D 1, SCHEDULE 13G 1).

| Filed | Accepted | Form | What it is | Accession |
| --- | --- | --- | --- | --- |
| 2026-09-21 | 16:07 ET | [8-K](/filings/0001437749-26-030822.md) | 5.02 Departure or appointment of officers or directors | 0001437749-26-030822 |
| 2026-08-05 | 16:10 ET | [10-Q](/filings/0001437749-26-025922.md) | Quarterly report, period 2026-06-30 | 0001437749-26-025922 |
| 2026-08-05 | 16:07 ET | [8-K](/filings/0001437749-26-025921.md) | 2.02 Results of operations; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0001437749-26-025921 |
| 2026-06-18 | 16:05 ET | [DEF 14A](/filings/0001193125-26-275809.md) | Proxy statement, period 2026-07-31 | 0001193125-26-275809 |
| 2026-06-02 | 16:05 ET | [8-K](/filings/0001437749-26-019163.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001437749-26-019163 |
| 2026-05-27 | 16:09 ET | [10-K](/filings/0001437749-26-018542.md) | Annual report, period 2026-03-31 | 0001437749-26-018542 |
| 2026-05-27 | 16:06 ET | [8-K](/filings/0001437749-26-018539.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001437749-26-018539 |
| 2026-02-17 | 16:08 ET | [8-K/A](/filings/0001437749-26-004349.md) | 9.01 Financial statements and exhibits | 0001437749-26-004349 |
| 2026-02-04 | 16:10 ET | [10-Q](/filings/0001437749-26-002978.md) | Quarterly report, period 2025-12-31 | 0001437749-26-002978 |
| 2026-02-04 | 16:07 ET | [8-K](/filings/0001437749-26-002977.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001437749-26-002977 |
| 2025-12-23 | 16:12 ET | [8-K](/filings/0001193125-25-330930.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-25-330930 |
| 2025-12-10 | 16:04 ET | [8-K](/filings/0001193125-25-314153.md) | 1.01 Entry into a material agreement; 2.01 Completion of an acquisition or disposition; 3.02 Unregistered sale of equity; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-25-314153 |
| 2025-11-05 | 16:13 ET | [10-Q](/filings/0001437749-25-033351.md) | Quarterly report, period 2025-09-30 | 0001437749-25-033351 |
| 2025-11-05 | 16:09 ET | [8-K](/filings/0001437749-25-033344.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001437749-25-033344 |
| 2025-07-30 | 16:08 ET | [10-Q](/filings/0001437749-25-023968.md) | Quarterly report, period 2025-06-30 | 0001437749-25-023968 |
| 2025-07-30 | 16:06 ET | [8-K](/filings/0001437749-25-023965.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001437749-25-023965 |
| 2025-07-29 | 16:09 ET | [8-K](/filings/0001437749-25-023783.md) | 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0001437749-25-023783 |
| 2025-06-13 | 16:05 ET | [DEF 14A](/filings/0001193125-25-140726.md) | Proxy statement, period 2025-07-25 | 0001193125-25-140726 |
| 2025-06-11 | 17:06 ET | [8-K](/filings/0001193125-25-139243.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-25-139243 |
| 2025-05-21 | 16:17 ET | [10-K](/filings/0001437749-25-017986.md) | Annual report, period 2025-03-31 | 0001437749-25-017986 |
| 2025-05-21 | 16:01 ET | [8-K](/filings/0001437749-25-017983.md) | 2.02 Results of operations; 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001437749-25-017983 |
| 2025-02-05 | 16:09 ET | [8-K](/filings/0001437749-25-002901.md) | 2.02 Results of operations; 5.03 Amendment to articles or bylaws; 9.01 Financial statements and exhibits | 0001437749-25-002901 |
| 2025-02-05 | 16:07 ET | [10-Q](/filings/0001437749-25-002900.md) | Quarterly report, period 2024-12-31 | 0001437749-25-002900 |
| 2024-10-30 | 16:14 ET | [10-Q](/filings/0001437749-24-032618.md) | Quarterly report, period 2024-09-30 | 0001437749-24-032618 |
| 2024-10-30 | 16:11 ET | [8-K](/filings/0001437749-24-032617.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001437749-24-032617 |
| 2024-08-13 | 20:56 ET | [8-K](/filings/0001193125-24-199141.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-24-199141 |
| 2024-08-06 | 16:38 ET | [8-K/A](/filings/0001437749-24-024924.md) | 9.01 Financial statements and exhibits | 0001437749-24-024924 |
| 2024-08-06 | 16:10 ET | [10-Q](/filings/0001437749-24-024886.md) | Quarterly report, period 2024-06-30 | 0001437749-24-024886 |
| 2024-08-06 | 16:08 ET | [8-K](/filings/0001437749-24-024881.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001437749-24-024881 |
| 2024-08-05 | 16:30 ET | [8-K](/filings/0001193125-24-193965.md) | 5.02 Departure or appointment of officers or directors; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0001193125-24-193965 |
| 2024-08-05 | 09:00 ET | [8-K](/filings/0001193125-24-193425.md) | 1.01 Entry into a material agreement; 2.01 Completion of an acquisition or disposition; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-24-193425 |
| 2024-06-20 | 16:05 ET | [DEF 14A](/filings/0001193125-24-164444.md) | Proxy statement, period 2024-08-02 | 0001193125-24-164444 |
| 2024-05-29 | 16:35 ET | [10-K](/filings/0001437749-24-018602.md) | Annual report, period 2024-03-31 | 0001437749-24-018602 |
| 2024-05-29 | 16:33 ET | [8-K](/filings/0001437749-24-018599.md) | 2.02 Results of operations; 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001437749-24-018599 |
| 2024-01-31 | 16:19 ET | [8-K](/filings/0001193125-24-020938.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-24-020938 |
| 2024-01-24 | 16:08 ET | [10-Q](/filings/0001437749-24-002041.md) | Quarterly report, period 2023-12-31 | 0001437749-24-002041 |
| 2024-01-24 | 16:06 ET | [8-K](/filings/0001437749-24-002040.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001437749-24-002040 |
| 2023-11-01 | 16:10 ET | [10-Q](/filings/0001437749-23-029753.md) | Quarterly report, period 2023-09-30 | 0001437749-23-029753 |
| 2023-11-01 | 16:08 ET | [8-K](/filings/0001437749-23-029749.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001437749-23-029749 |
| 2023-08-11 | 16:12 ET | [8-K](/filings/0001437749-23-023329.md) | 5.07 Shareholder vote results | 0001437749-23-023329 |
| 2023-08-09 | 16:10 ET | [10-Q](/filings/0001437749-23-022793.md) | Quarterly report, period 2023-06-30 | 0001437749-23-022793 |
| 2023-08-09 | 16:08 ET | [8-K](/filings/0001437749-23-022786.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001437749-23-022786 |
| 2023-06-28 | 16:15 ET | [DEF 14A](/filings/0001193125-23-177510.md) | Proxy statement, period 2023-08-11 | 0001193125-23-177510 |
| 2023-06-21 | 16:31 ET | [8-K](/filings/0001193125-23-171201.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001193125-23-171201 |
| 2023-05-31 | 16:12 ET | [10-K](/filings/0001437749-23-016265.md) | Annual report, period 2023-03-31 | 0001437749-23-016265 |
| 2023-05-31 | 16:11 ET | [8-K](/filings/0001437749-23-016264.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001437749-23-016264 |
| 2023-02-01 | 16:57 ET | [10-Q](/filings/0001437749-23-002270.md) | Quarterly report, period 2022-12-31 | 0001437749-23-002270 |
| 2023-02-01 | 16:56 ET | [8-K](/filings/0001437749-23-002268.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001437749-23-002268 |
| 2022-11-01 | 16:08 ET | [10-Q](/filings/0001437749-22-025367.md) | Quarterly report, period 2022-09-30 | 0001437749-22-025367 |
| 2022-11-01 | 16:06 ET | [8-K](/filings/0001437749-22-025365.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001437749-22-025365 |

Page 1 of 7. [Older](/companies/amsc/filings.md?page=2)
Source: SEC EDGAR, the company’s filing index. Last ingested by Listed: Oct 24, 2026, 14:58 ET. No prices; not investment advice.