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AMSC US
American Superconductor Corp /DE/
(AMSC US)
$25.12
+0.11
0.44%
Ext:
$25.09
-0.03
0.13%
(Market Closed · 23:43:45 UTC)
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SEC Filings
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Ask in Filing
Financials
(132)
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10-Q
Q1
ended 30 Jun 2026
5 Aug
10-K
FY 2026
ended 31 Mar 2026
27 May
10-Q
Q3
ended 31 Dec 2025
4 Feb
10-Q
Q2
ended 30 Sept 2025
5 Nov 2025
10-Q
Q1
ended 30 Jun 2025
30 Jul 2025
10-K
FY 2025
ended 31 Mar 2025
21 May 2025
10-Q
Q3
ended 31 Dec 2024
5 Feb 2025
10-Q
Q2
ended 30 Sept 2024
30 Oct 2024
10-Q
Q1
ended 30 Jun 2024
6 Aug 2024
10-K
FY 2024
ended 31 Mar 2024
29 May 2024
10-Q
Q3
ended 31 Dec 2023
24 Jan 2024
10-Q
Q2
ended 30 Sept 2023
1 Nov 2023
10-K
FY 2023
ended 31 Mar 2023
31 May 2023
10-Q
Q3
ended 31 Dec 2022
1 Feb 2023
10-Q
Q2
ended 30 Sept 2022
1 Nov 2022
Events
(262)
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8-K
Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers
21 Sep
8-K
Results of Operations and Financial Condition
5 Aug
8-K
Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers
2 Jun
8-K
Results of Operations and Financial Condition
27 May
8-K/A
Financial Statements and Exhibits
17 Feb
8-K
Results of Operations and Financial Condition
4 Feb
8-K
Other Events
23 Dec 2025
8-K
Entry into a Material Definitive Agreement
10 Dec 2025
8-K
Results of Operations and Financial Condition
5 Nov 2025
8-K
Results of Operations and Financial Condition
30 Jul 2025
8-K
Submission of Matters to Shareholder Vote
29 Jul 2025
8-K
Other Events
11 Jun 2025
8-K
Results of Operations and Financial Condition
21 May 2025
8-K
Results of Operations and Financial Condition
5 Feb 2025
8-K
Results of Operations and Financial Condition
30 Oct 2024
Insider Ownership
(549)
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4
Statement of changes in beneficial ownership
21 Sep
4
Statement of changes in beneficial ownership
12 Jun
4
Statement of changes in beneficial ownership
11 Jun
4
Statement of changes in beneficial ownership
11 Jun
4
Statement of changes in beneficial ownership
10 Jun
4
Statement of changes in beneficial ownership
10 Jun
4
Statement of changes in beneficial ownership
3 Jun
4
Statement of changes in beneficial ownership
3 Jun
4
Statement of changes in beneficial ownership
7 Apr
4
Statement of changes in beneficial ownership
7 Apr
4
Statement of changes in beneficial ownership
7 Apr
4
Statement of changes in beneficial ownership
7 Apr
4
Statement of changes in beneficial ownership
7 Apr
4
Statement of changes in beneficial ownership
7 Apr
4
Statement of changes in beneficial ownership
26 Feb
Beneficial Ownership
(120)
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SC 13G/A
AMERICAN SUPERCONDUCTOR CORP /DE/
31 Jul
SC 13G
AMERICAN SUPERCONDUCTOR CORP /DE/
29 Apr
SC 13G/A
AMERICAN SUPERCONDUCTOR CORP /DE/
26 Mar
SC 13G/A
AMERICAN SUPERCONDUCTOR CORP /DE/
30 Jan
SC 13G/A
AMERICAN SUPERCONDUCTOR CORP /DE/
17 Apr 2025
SC 13G/A
AMERICAN SUPERCONDUCTOR CORP /DE/
12 Feb 2025
SC 13G/A
AMERICAN SUPERCONDUCTOR CORP /DE/
5 Feb 2025
SC 13G/A
AMERICAN SUPERCONDUCTOR CORP /DE/
12 Nov 2024
SC 13G
AMERICAN SUPERCONDUCTOR CORP /DE/
8 Nov 2024
SC 13G
AMERICAN SUPERCONDUCTOR CORP /DE/
4 Nov 2024
SC 13G/A
AMERICAN SUPERCONDUCTOR CORP /DE/
4 Nov 2024
SC 13G
AMERICAN SUPERCONDUCTOR CORP /DE/
22 Oct 2024
SC 13G/A
AMERICAN SUPERCONDUCTOR CORP /DE/
9 Aug 2024
SC 13G/A
AMERICAN SUPERCONDUCTOR CORP /DE/
14 Feb 2024
SC 13G/A
AMERICAN SUPERCONDUCTOR CORP /DE/
30 Jan 2024
Other Ownership
(30)
Expand
144
Kosiba John W JR
11 Jun
144
McGahn Daniel P
11 Jun
144
Dambier Laura A.
10 Jun
144
Kosiba John W JR
8 Jun
144
McGahn Daniel P
8 Jun
144
McGahn Daniel P
3 Jun
144
Kosiba John W JR
3 Jun
144
Kosiba John W JR
2 Jun
144
McGahn Daniel P
2 Jun
144
House Arthur H
8 Aug 2025
144
McGahn Daniel P
4 Aug 2025
144
Kosiba John W JR
4 Aug 2025
144
Kosiba John W JR
11 Jun 2025
144
McGahn Daniel P
11 Jun 2025
144
McGahn Daniel P
6 Jun 2025
Proxies
(72)
Expand
ARS
Annual report to security holders
18 Jun
DEFA14A
Definitive additional materials
18 Jun
DEF 14A
Definitive proxy statement
18 Jun
ARS
Annual report to security holders
13 Jun 2025
DEFA14A
Definitive additional materials
13 Jun 2025
DEF 14A
Definitive proxy statement
13 Jun 2025
DEFA14A
Definitive additional materials
20 Jun 2024
DEF 14A
Definitive proxy statement
20 Jun 2024
ARS
Annual report to security holders
20 Jun 2024
PRE 14A
Preliminary proxy statement
10 Jun 2024
DEFA14A
Definitive additional materials
28 Jun 2023
ARS
Annual report to security holders
28 Jun 2023
DEF 14A
Definitive proxy statement
28 Jun 2023
DEFA14A
Definitive additional materials
26 Jul 2022
DEF 14A
Definitive proxy statement
23 Jun 2022
Registrations
(97)
Expand
424B7
Prospectus filing (Rule 424(b)(7))
23 Dec 2025
424B5
Prospectus filing (Rule 424(b)(5))
11 Jun 2025
424B5
Prospectus filing (Rule 424(b)(5))
10 Jun 2025
S-8
Registration statement (employee benefit plan)
28 Aug 2024
424B7
Prospectus filing (Rule 424(b)(7))
12 Aug 2024
S-3ASR
Automatic shelf registration statement (S-3)
12 Aug 2024
S-3/A
Registration statement (primary offering, amendment)
8 Mar 2024
424B5
Prospectus filing (Rule 424(b)(5))
31 Jan 2024
424B5
Prospectus filing (Rule 424(b)(5))
30 Jan 2024
S-3
Registration statement (primary offering)
30 Jan 2024
S-8 POS
Post-effective amendment (employee benefit plan)
17 Nov 2022
S-8 POS
Post-effective amendment (employee benefit plan)
17 Nov 2022
S-8 POS
Post-effective amendment (employee benefit plan)
17 Nov 2022
S-8 POS
Post-effective amendment (employee benefit plan)
17 Nov 2022
S-8 POS
Post-effective amendment (employee benefit plan)
17 Nov 2022
Filing Review Correspondence
(5)
Expand
CORRESP
Filing review correspondence
13 Mar 2024
CORRESP
Filing review correspondence
6 Mar 2024
CORRESP
Filing review correspondence
5 Mar 2024
CORRESP
Filing review correspondence
13 Feb 2018
CORRESP
Filing review correspondence
17 Oct 2017
SEC Orders And Notices
(40)
Expand
EFFECT
Notice of effectiveness
15 Mar 2024
EFFECT
Notice of effectiveness
21 Jun 2021
CT ORDER
Confidential treatment order
30 May 2019
CT ORDER
Confidential treatment order
13 Feb 2019
CT ORDER
Confidential treatment order
30 Aug 2018
CT ORDER
Confidential treatment order
10 Aug 2018
CT ORDER
Confidential treatment order
10 Aug 2018
CT ORDER
Confidential treatment order
13 Jul 2018
EFFECT
Notice of effectiveness
15 Feb 2018
EFFECT
Notice of effectiveness
23 Oct 2017
CT ORDER
Confidential treatment order
11 Sep 2017
CT ORDER
Confidential treatment order
10 Jul 2017
CT ORDER
Confidential treatment order
17 Nov 2016
CT ORDER
Confidential treatment order
20 Jul 2016
CT ORDER
Confidential treatment order
5 Apr 2016
Exempt Offerings
(1)
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D
Notice of exempt offering of securities (Reg D)
19 Apr 2012
Other
(13)
Expand
SD
SD
29 May
SD
SD
21 May 2025
SD
SD
28 May 2024
SD
SD
31 May 2023
SD
SD
27 May 2021
SD
SD
26 May 2020
SD
SD
30 May 2019
SD
SD
25 May 2018
SD
SD
25 May 2017
SD
SD
27 May 2016
SD
SD
28 May 2015
SD
SD
30 May 2014
SD
SD
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