American Superconductor AMSC SEC Filings

NASDAQ AMSC
$25.40 +0.28 (+1.11%)
At close: Oct 26, 2026 · 4:00 PM EDT
EDGAR Disclosures

SEC Filings

Source SEC EDGAR

Every SEC filing American Superconductor Corp /De/ (AMSC) has made, as reported on EDGAR — annual and quarterly reports, current reports, insider transactions and ownership disclosures. Filter by form group, form type or period, and open any filing or its index directly.

Form Type
# Form Type Form Group Accession Date Filing Index
14Insider Transaction0001193125-26-396831Sep 21, 2026 9:22 PM
28-KCurrent Report0001437749-26-030822Sep 21, 2026 4:07 PM
310-QQuarterly & Annual Report0001437749-26-025922Aug 5, 2026 8:10 PM
48-KCurrent Report0001437749-26-025921Aug 5, 2026 8:07 PM
5SCHEDULE 13GBeneficial Ownership Report0002100119-26-001340Jul 31, 2026 1:56 PM
6ARSOthers0001193125-26-275845Jun 18, 2026 8:09 PM
7DEFA14AOthers0001193125-26-275831Jun 18, 2026 8:07 PM
8DEF 14AOthers0001193125-26-275809Jun 18, 2026 8:05 PM
94Insider Transaction0001193125-26-269433Jun 12, 2026 4:11 PM
10144Insider Transaction0001950047-26-005955Jun 11, 2026 8:34 PM
114Insider Transaction0001193125-26-267677Jun 11, 2026 8:31 PM
124Insider Transaction0001193125-26-267642Jun 11, 2026 8:29 PM
13144Insider Transaction0001950047-26-005923Jun 11, 2026 8:18 PM
144Insider Transaction0001193125-26-265996Jun 10, 2026 8:55 PM
154Insider Transaction0001193125-26-265990Jun 10, 2026 8:53 PM
16144Insider Transaction0001949846-26-000370Jun 10, 2026 5:19 PM
17144Insider Transaction0001950047-26-005745Jun 8, 2026 8:18 PM
18144Insider Transaction0001950047-26-005744Jun 8, 2026 8:17 PM
19144Insider Transaction0001950047-26-005559Jun 3, 2026 8:21 PM
20144Insider Transaction0001950047-26-005556Jun 3, 2026 8:20 PM
214Insider Transaction0001193125-26-255471Jun 3, 2026 8:15 PM
224Insider Transaction0001193125-26-255450Jun 3, 2026 8:11 PM
23144Insider Transaction0001950047-26-005517Jun 2, 2026 8:49 PM
24144Insider Transaction0001950047-26-005472Jun 2, 2026 8:07 PM
258-KCurrent Report0001437749-26-019163Jun 2, 2026 8:05 PM
26SDOthers0001437749-26-018910May 29, 2026 9:17 PM
2710-KQuarterly & Annual Report0001437749-26-018542May 27, 2026 4:09 PM-
288-KCurrent Report0001437749-26-018539May 27, 2026 4:06 PM-
29SCHEDULE 13GBeneficial Ownership Report0002100119-26-000109Apr 29, 2026 8:34 PM
30SCHEDULE 13GBeneficial Ownership Report0002100119-26-000109Apr 29, 2026 8:34 PM
31SCHEDULE 13GBeneficial Ownership Report0002100119-26-000109Apr 29, 2026 8:34 PM
324Insider Transaction0001193125-26-145815Apr 7, 2026 9:45 PM
334Insider Transaction0001193125-26-145815Apr 7, 2026 9:45 PM
344Insider Transaction0001193125-26-145815Apr 7, 2026 9:45 PM
354Insider Transaction0001193125-26-145810Apr 7, 2026 9:42 PM
364Insider Transaction0001193125-26-145810Apr 7, 2026 9:42 PM
374Insider Transaction0001193125-26-145810Apr 7, 2026 9:42 PM
384Insider Transaction0001193125-26-145803Apr 7, 2026 9:40 PM
394Insider Transaction0001193125-26-145803Apr 7, 2026 9:40 PM
404Insider Transaction0001193125-26-145803Apr 7, 2026 9:40 PM
414Insider Transaction0001193125-26-145799Apr 7, 2026 9:38 PM
424Insider Transaction0001193125-26-145799Apr 7, 2026 9:38 PM
434Insider Transaction0001193125-26-145799Apr 7, 2026 9:38 PM
444Insider Transaction0001193125-26-145795Apr 7, 2026 9:35 PM
454Insider Transaction0001193125-26-145795Apr 7, 2026 9:35 PM
464Insider Transaction0001193125-26-145795Apr 7, 2026 9:35 PM
474Insider Transaction0001193125-26-145787Apr 7, 2026 9:33 PM
484Insider Transaction0001193125-26-145787Apr 7, 2026 9:33 PM
494Insider Transaction0001193125-26-145787Apr 7, 2026 9:33 PM
50SCHEDULE 13GBeneficial Ownership Report0000102909-26-000605Mar 26, 2026 7:42 PM
...

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