American Superconductor Corporation Form 8-K Filing

On December 23, 2025, American Superconductor Corporation (the "Company") filed a prospectus supplement with the SEC regarding shares of the Company’s common stock to be sold by certain selling stockholders. This supplement is part of the Company’s Registration Statement on Form S-3, which became effective on August 12, 2024. Latham & Watkins LLP, the Company's counsel, has issued an opinion confirming the validity of these shares as of December 23, 2025. This opinion is filed as Exhibit 5.1 to the Form 8-K. The filing also includes Exhibit 23.1, the consent of Latham & Watkins LLP, and Exhibit 104, the Cover Page Interactive Data File.