Welcome to our dedicated page for AMERICAN SUPERCONDUCTOR /DE/ SEC filings (Ticker: AMSC), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
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American Superconductor senior vice president, CFO and treasurer John W. Kosiba Jr. reported open-market sales of common stock that were used to cover tax withholding on vesting restricted stock awards. On June 8, 2026, he sold 3,286 shares at a weighted average price of $41.5007 and 1,549 shares at a weighted average price of $42.347, in multiple trades within disclosed price ranges. The transactions were executed under a pre-arranged Rule 10b5-1 trading plan. After these transactions, he holds 341,146 shares directly and 371 shares indirectly through the company’s 401(k) plan as of June 10, 2026.
American Superconductor Corp. Chairman, President and CEO Daniel P. McGahn reported selling a total of 9,670 shares of common stock on June 8, 2026. The sales were made at weighted average prices of $41.3891 and $42.1935 per share in open-market transactions.
According to the filing, these shares were sold to cover tax withholding obligations related to vesting of restricted stock awards and were executed under a previously established Rule 10b5-1 trading plan. After these transactions, McGahn holds 1,148,046 shares directly and 13,344 shares indirectly through the company’s 401(k) plan as of June 10, 2026.
Charles Schwab Corporation filed a Form 144 notice concerning common stock tied to prior restricted stock awards. The filing lists a 2,639-share restricted award dated 04/11/2025 and a 1,361-share restricted award dated 04/12/2024. The filing lists Nasdaq as the market and shows the date 06/10/2026 in the securities section.
John Kosiba submitted a Rule 144 notice reporting a proposed sale of 4,835 shares of Common Stock of AMSC through Morgan Stanley Smith Barney LLC. The filing shows an aggregate value of $201,966.65 and lists 47,694,445 shares outstanding as of 06/08/2026. The notice also reports prior sales of 6,447 shares on 06/03/2026 for $315,547.77 and 30,462 shares on 06/02/2026 for $1,546,485.68.
AMSC reported insider sales. Form 144 filings show Daniel McGahn sold 72,525 shares of Common stock on 06/02/2026 for $3,682,892.03 and 12,893 shares on 06/03/2026 for $630,265.28. The filing also lists 9,670 restricted shares listed to be sold on 06/05/2026.
Morgan Stanley Smith Barney LLC submitted a Rule 144 notice reporting a proposed sale of 12,893 shares of Common Stock held as Restricted Stock, dated 06/02/2026. The filing shows prior sales of 72,525 shares during the past three months and lists Daniel McGahn as the holder.
AMSC: A Form 144 notice reports a proposed sale of 6,447 shares of Common Stock identified as restricted stock, dated 06/02/2026. The filing names John Kosiba and Morgan Stanley Smith Barney LLC as the broker/placement agent.
The excerpt also shows 30,462 shares of Common Stock were sold in the past three months on 06/02/2026 for an aggregate amount of $1,546,485.68. Shares outstanding are listed as 47,694,445 as of 06/03/2026.
American Superconductor (AMSC) SVP, CFO & Treasurer John W. Kosiba Jr. reported both a stock grant and planned share sales. On June 1, 2026, he received a restricted stock award of 30,000 common shares, which will vest in three equal annual installments beginning June 10, 2027.
On June 2–3, 2026, he sold 36,909 common shares in multiple open-market transactions at weighted average prices around the high-$40s to low-$50s per share. A footnote states these sales were made to cover tax withholding obligations related to vesting of restricted stock awards and were executed under a pre-arranged Rule 10b5-1 trading plan adopted on August 15, 2025. After these transactions, he holds 345,981 common shares directly and 320 shares indirectly through the company’s 401(k) plan as of June 3, 2026.
AMERICAN SUPERCONDUCTOR CORP (AMSC) chairman, president and CEO Daniel P. McGahn reported both a stock grant and related share sales. On June 1, 2026, he received a restricted stock award of 60,000 common shares that will vest in three equal annual installments beginning on June 10, 2027.
On June 2–3, 2026, he sold 85,418 common shares in open-market transactions. A footnote states these sales were made to cover tax withholding obligations tied to vesting of restricted stock awards and were executed under a previously adopted Rule 10b5-1 trading plan. After these transactions, he holds 1,157,716 shares directly and 13,262 shares indirectly through the company’s 401(k) plan as of June 3, 2026.