(AMSC)

Reporting relationship: Director
Issuer ticker: AMSC
Reported as of: 18 Sep 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 21 Sep 2026, 17:22:19 UTC
Prior SEC filing: 07 Apr 2026
Source filing: View source filing
Reporting owner signature: /s/ John R. Samia, Attorney-in-Fact

Key filing fact

Barbara G. Littlefield filed Form 4 for AMERICAN SUPERCONDUCTOR CORP /DE/ (AMSC) on 21 Sep 2026.

Key facts

This page summarizes Barbara G. Littlefield's Form 4 filing for AMERICAN SUPERCONDUCTOR CORP /DE/ (AMSC).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 21 Sep 2026, 17:22.

Change

Previous filing in this sequence was filed on 07 Apr 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001777725 Primary reporting owner

Littlefield Barbara G.

Relationship: Director
Address: C/O AMERICAN SUPERCONDUCTOR CORPORATION, 114 EAST MAIN STREET, AYER
Signature: /s/ John R. Samia, Attorney-in-Fact
Signature date: 21 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

AMSC transaction

Common Stock

Award

Transaction value
Shares: +1,607
Change %: +4.5%
Price: $0.000000^*
Shares after: 37,034
Date: 18 Sep 2026
Ownership: Direct
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Section 16 status

Barbara G. Littlefield is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may still apply in specific circumstances.

Explanation of responses 2 footnotes

Footnote F1

This award of immediately vested shares of American Superconductor Corporation (the "Company") common stock was made in connection with Ms. Littlefield's departure from the Company's Board in accordance with the Company's Amended and Restated 2007 Director Stock Plan, as Amended.

Footnote F2

Following all the transactions reported on this Form 4, the reporting person holds 37,034 shares directly.