AMSC SEC Filings: 8-K, 10-Q, S-3 & 424B

Financials

TYPE

HEADLINE

FILED AT

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Nov 4, 2026

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Aug 5, 2026

10-K

Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]

May 27, 2026

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Feb 4, 2026

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Nov 5, 2025

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Jul 30, 2025

News

TYPE

HEADLINE

FILED AT

8-K

AMSC Reports Second Quarter Fiscal Year 2026 Financial Results and Business Outlook

Nov 4, 2026

8-K

Barbara G. Littlefield Resigns from American Superconductor Corporation Board of Directors

Sep 21, 2026

8-K

AMSC Reports Record First Quarter Fiscal Year 2026 Financial Results

Aug 5, 2026

8-K

American Superconductor Corporation Announces Fiscal 2026 Executive Incentive Plan

Jun 2, 2026

8-K

AMSC Reports Record Fiscal Year 2025 Financial Results

May 27, 2026

8-K/A

Comtrafo Industria de Transformadores Elétricos S.A. Releases Unaudited Financial Statements for Nine Months Ended September 30, 2025

Feb 17, 2026

Prospectus

TYPE

HEADLINE

FILED AT

424B7

SHARE RESALE REGISTRATION | Shares amount: 2,417,142

Dec 23, 2025

424B5

SHELF OFFERING | Shares amount: 4,125,000 | Share price: $28 | Offering amount: $115,500,000 | Bank: Oppenheimer & Co.

Jun 11, 2025

424B5

SHELF OFFERING | Bank: Oppenheimer & Co.

Jun 10, 2025

424B7

SHARE RESALE REGISTRATION | Shares amount: 1,297,600

Aug 12, 2024

424B5

SHELF OFFERING | Shares amount: 5,400,000 | Share price: $11.25 | Offering amount: $60,750,000.00

Jan 31, 2024

424B5

PENDING OFFERING | Share price: $13.64

Jan 30, 2024

Registrations

TYPE

HEADLINE

FILED AT

S-8

Form S-8 - Securities to be offered to employees in employee benefit plans

Aug 28, 2024

S-3ASR

SHELF

Aug 12, 2024

S-3/A

SHELF | Offering amount: $250,000,000.00 EFFECTIVE

Mar 8, 2024

S-3

SHELF | Offering amount: $250,000,000.00 EFFECTIVE

Jan 30, 2024

S-8 POS

Registration

Nov 17, 2022

S-8 POS

Registration

Nov 17, 2022

Proxies

TYPE

HEADLINE

FILED AT

DEFA14A

Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material

Jun 18, 2026

DEF 14A

Form DEF 14A - Other definitive proxy statements

Jun 18, 2026

DEFA14A

Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material

Jun 13, 2025

DEF 14A

Form DEF 14A - Other definitive proxy statements

Jun 13, 2025

DEFA14A

Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material

Jun 20, 2024

DEF 14A

Form DEF 14A - Other definitive proxy statements

Jun 20, 2024

Ownerships

TYPE

HEADLINE

FILED AT

Littlefield Barbara G. (Reporting)

Sep 21, 2026

SCHEDULE 13G/A

VANGUARD CAPITAL MANAGEMENT LLC (Filed by)

Jul 31, 2026

Dambier Laura A. (Reporting)

Jun 12, 2026

144

Form 144 - Report of proposed sale of securities

Jun 11, 2026

Kosiba John W JR (Reporting)

Jun 11, 2026

McGahn Daniel P (Reporting)

Jun 11, 2026

Other

TYPE

HEADLINE

FILED AT

Form SD - Specialized disclosure report

May 29, 2026

Form SD - Specialized disclosure report

May 21, 2025

Form SD - Specialized disclosure report

May 28, 2024

EFFECT

Form EFFECT - Notice of Effectiveness

Mar 18, 2024

CORRESP

Form CORRESP - Correspondence

Mar 13, 2024

CORRESP

Form CORRESP - Correspondence

Mar 6, 2024

American Superconductor Corporation AMSC · SEC Filings