American Superconductor Corp /De/ (AMSC) Insider Ownership

Historic Insider Ownership Trends

American Superconductor's top three insider shareholders as of April 22, 2026 are Daniel P Mcgahn (Chairman, President And Ceo, 1.18Mn shares), Daniel P Mcgahn (Chairman, President And Ceo, 1.18Mn shares), John W Jr Kosiba (Svp, Cfo Treasurer, 352.89K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Daniel P Mcgahn Chairman, President And Ceo 1,183,134 0 06 Aug, 2025
Daniel P Mcgahn Chairman, President And Ceo 1,183,134 0 06 Aug, 2025
John W Jr Kosiba Svp, Cfo Treasurer 352,890 0 06 Aug, 2025
John W Jr Kosiba Svp, Cfo Treasurer 352,890 0 06 Aug, 2025
David R Jr Oliver - 63,823 0 07 Apr, 2026
Vikram S Budhraja - 59,299 0 13 Jun, 2022
Vikram S Budhraja - 59,299 0 13 Jun, 2022
Arthur H House - 51,779 0 07 Apr, 2026
Barbara G. Littlefield - 35,427 0 07 Apr, 2026
Barbara G. Littlefield - 32,311 0 04 Apr, 2025
Margaret D. Klein - 19,492 0 07 Apr, 2026
Laura A. Dambier - 18,992 0 07 Apr, 2026
Margaret D. Klein - 15,876 0 04 Apr, 2025
Terence Robert Donnelly - 2,665 0 07 Apr, 2026

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
03 Apr, 2026 Margaret D. Klein Common Stock A 3,116 $0.00 19,492 D A
03 Apr, 2026 Laura A. Dambier Common Stock A 3,116 $0.00 18,992 D A
03 Apr, 2026 David R Jr Oliver Common Stock A 3,116 $0.00 63,823 D A
03 Apr, 2026 Arthur H House Common Stock A 3,116 $0.00 51,779 D A
03 Apr, 2026 Barbara G. Littlefield Common Stock A 3,116 $0.00 35,427 D A
03 Apr, 2026 Terence Robert Donnelly Common Stock A 2,665 $0.00 2,665 D A
24 Feb, 2026 David R Jr Oliver Common Stock D 200 $34.10 60,707 D S
06 Aug, 2025 Arthur H House Common Stock A 9,703 $6.80 58,366 D M
08 Aug, 2025 Arthur H House Common Stock D 9,703 $50.92 48,663 D S
06 Aug, 2025 Arthur H House Stock Options (Right to Buy) D 9,703 $0.00 0 D M
04 Aug, 2025 John W Jr Kosiba Common Stock D 34,260 $54.34 368,630 D S
04 Aug, 2025 Daniel P Mcgahn Common Stock D 73,105 $54.26 1,210,877 D S
04 Aug, 2025 John W Jr Kosiba Common Stock D 15,740 $55.13 352,890 D S
04 Aug, 2025 Daniel P Mcgahn Common Stock D 27,743 $55.11 1,183,134 D S
04 Aug, 2025 John W Jr Kosiba Common Stock D 9,843 $55.26 0 I S
11 Jun, 2025 John W Jr Kosiba Common Stock D 6,342 $28.55 403,190 D S
11 Jun, 2025 Daniel P Mcgahn Common Stock D 12,315 $28.56 1,284,482 D S
11 Jun, 2025 Daniel P Mcgahn Common Stock D 500 $29.09 1,283,982 D S
11 Jun, 2025 John W Jr Kosiba Common Stock D 300 $29.08 402,890 D S
06 Jun, 2025 John W Jr Kosiba Common Stock D 4,744 $31.83 409,532 D S