AMSC files prospectus supplement for common stock resale by selling stockholders

AMERICAN SUPERCONDUCTOR CORP /DE/

Prospectus supplement filed Dec 23, 2025 under existing S-3 shelf registration.
Shares to be sold from time to time by certain selling stockholders; no new share issuance by AMSC.
Latham & Watkins legal opinion on share validity filed as Exhibit 5.1.

item 8.01item 9.01

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