As of the latest Form 4 filed Jun 12, 2026.
What American Superconductor Corporation insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 33 most recent filings for AMSC.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-06-12 | 2026-06-11 | Dambier Laura A. Director | SSale | −4.00K | $37.63 | $151K | No | Form 4 ↗ |
| 2026-06-11 | 2026-06-11 | Kosiba John W JR SVP, CFO & Treasurer | SSale | −1.74K | $37.85 | $66.0K | Yes (planned) | Form 4 ↗ |
| 2026-06-11 | 2026-06-11 | Kosiba John W JR, SVP, CFO & Treasurer | SSale | −5.03K | $37.33 | $188K | Yes (planned) | Form 4 ↗ |
| 2026-06-11 | 2026-06-11 | McGahn Daniel P Chairman, President and CEO | SSale | −4.61K | $37.85 | $174K | Yes (planned) | Form 4 ↗ |
| 2026-06-11 | 2026-06-11 | McGahn Daniel P, Chairman, President and CEO | SSale | −11.5K | $37.28 | $429K | Yes (planned) | Form 4 ↗ |
| 2026-06-10 | 2026-06-08 | Kosiba John W JR SVP, CFO & Treasurer | SSale | −1.55K | $42.35 | $65.6K | Yes (planned) | Form 4 ↗ |
| 2026-06-10 | 2026-06-08 | Kosiba John W JR, SVP, CFO & Treasurer | SSale | −3.29K | $41.50 | $136K | Yes (planned) | Form 4 ↗ |
| 2026-06-10 | 2026-06-08 | McGahn Daniel P Chairman, President and CEO | SSale | −4.68K | $42.19 | $197K | Yes (planned) | Form 4 ↗ |
| 2026-06-10 | 2026-06-08 | McGahn Daniel P, Chairman, President and CEO | SSale | −4.99K | $41.39 | $207K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-03 | Kosiba John W JR SVP, CFO & Treasurer | SSale | −609.00 | $50.83 | $31.0K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-03 | Kosiba John W JR, SVP, CFO & Treasurer | SSale | −2.64K | $49.28 | $130K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-03 | Kosiba John W JR, SVP, CFO & Treasurer | SSale | −3.20K | $48.31 | $155K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-03 | McGahn Daniel P Chairman, President and CEO | SSale | −817.00 | $50.99 | $41.7K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-03 | McGahn Daniel P, Chairman, President and CEO | SSale | −500.00 | $50.29 | $25.1K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-03 | McGahn Daniel P, Chairman, President and CEO | SSale | −4.50K | $49.25 | $222K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-03 | McGahn Daniel P, Chairman, President and CEO | SSale | −7.08K | $48.31 | $342K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-02 | Kosiba John W JR SVP, CFO & Treasurer | SSale | −600.00 | $52.19 | $31.3K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-02 | Kosiba John W JR, SVP, CFO & Treasurer | SSale | −12.0K | $51.47 | $619K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-02 | Kosiba John W JR, SVP, CFO & Treasurer | SSale | −12.1K | $50.62 | $614K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-02 | Kosiba John W JR, SVP, CFO & Treasurer | SSale | −5.70K | $49.46 | $282K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-02 | McGahn Daniel P Chairman, President and CEO | SSale | −2.31K | $52.14 | $120K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-02 | McGahn Daniel P, Chairman, President and CEO | SSale | −28.6K | $51.46 | $1.47M | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-02 | McGahn Daniel P, Chairman, President and CEO | SSale | −27.9K | $50.63 | $1.41M | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-02 | McGahn Daniel P, Chairman, President and CEO | SSale | −13.8K | $49.45 | $681K | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | Kosiba John W JR SVP, CFO & Treasurer | AAward | +30.0K | $0.00 | $0.00 | Yes (planned) | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | McGahn Daniel P Chairman, President and CEO | AAward | +60.0K | $0.00 | $0.00 | Yes (planned) | Form 4 ↗ |
| 2026-04-07 | 2026-04-03 | Donnelly Terence Robert Director | AAward | +2.67K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-04-07 | 2026-04-03 | OLIVER DAVID R JR Director | AAward | +3.12K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-04-07 | 2026-04-03 | Littlefield Barbara G. Director | AAward | +3.12K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-04-07 | 2026-04-03 | Klein Margaret D. Director | AAward | +3.12K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-04-07 | 2026-04-03 | House Arthur H Director | AAward | +3.12K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-04-07 | 2026-04-03 | Dambier Laura A. Director | AAward | +3.12K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-02-26 | 2026-02-24 | OLIVER DAVID R JR Director | SSale | −200.00 | $34.10 | $6.82K | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also AMSC’s full analysis or the market-wide insider trading feed. The tabs above jump to AMSC’s other SEC data.
Source: SEC Form 4 filings for AMSC, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.