X0609 4 2026-06-01 0000880807 AMERICAN SUPERCONDUCTOR CORP /DE/ AMSC 0001703463 Kosiba John W JR false C/O AMERICAN SUPERCONDUCTOR CORPORATION 114 EAST MAIN ST AYER MA 01432 false true false false SVP, CFO & Treasurer true Common Stock 2026-06-01 4 A false 30000 0 A 382890 D Common Stock 2026-06-02 4 S false 5704 49.461 D 377186 D Common Stock 2026-06-02 4 S false 12122 50.6188 D 365064 D Common Stock 2026-06-02 4 S false 12036 51.466 D 353028 D Common Stock 2026-06-02 4 S false 600 52.1917 D 352428 D Common Stock 2026-06-03 4 S false 3200 48.3069 D 349228 D Common Stock 2026-06-03 4 S false 2638 49.2846 D 346590 D Common Stock 2026-06-03 4 S false 609 50.8258 D 345981 D Common Stock 320 I By 401(k) plan The restricted stock award was granted on June 1, 2026. The award will vest in three equal annual installments beginning June 10, 2027. Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously entered into by the reporting person on August 15, 2025. The sales were executed in multiple trades at prices ranging from $48.95-$49.87. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and price at which the transaction was effected. The sales were executed in multiple trades at prices ranging from $49.99-$50.95. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and price at which the transaction was effected. The sales were executed in multiple trades at prices ranging from $50.99-$51.90. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and price at which the transaction was effected. The sales were executed in multiple trades at prices ranging from $52.00-$52.37. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and price at which the transaction was effected. The sales were executed in multiple trades at prices ranging from $47.80-$48.76. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected. The sales were executed in multiple trades at prices ranging from $48.87-$49.62. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected. The sales were executed in multiple trades at prices ranging from $50.35-$50.99. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the number of shares and prices at which the transactions were effected. Following all the transactions reported on this Form 4, the reporting person holds 345,981 shares directly. Following all the transactions reported on this Form 4, the reporting person holds 320 shares indirectly through the company's 401(k) plan as of June 3, 2026. /s/ John W. Kosiba, Jr. 2026-06-03