SEC Form 4 · Updated Daily
AMSC
— AMERICAN SUPERCONDUCTOR CORPORATION OwnershipInsider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| McGahn Daniel P | Director · Officer | 1,136,538 | 2026-06-11 | S |
| DOUGLAS KEVIN | 10%+ Owner | 834,533 | 2015-04-24 | P |
| DOUGLAS FAMILY TRUST | 10%+ Owner | 834,533 | 2015-04-24 | P |
| JAMES & JEAN DOUGLAS IRREVOCABLE DESCENDANTS TRUST | 10%+ Owner | 834,533 | 2015-04-24 | P |
| DOUGLAS JAMES E III | 10%+ Owner | 834,533 | 2015-04-24 | P |
| Douglas Michelle | 10%+ Owner | 834,533 | 2015-04-24 | P |
| Kosiba John W JR | Officer | 336,120 | 2026-06-11 | S |
| Poor Timothy D. | Officer | 196,705 | 2012-12-31 | D |
| YUREK GREGORY J | Director | 176,012 | 2011-06-01 | D |
| DiCecco Susan J | Officer | 147,857 | 2012-12-31 | D |
| CRISP PETER O | Director | 118,603 | 2011-12-13 | A |
| MALOZEMOFF ALEXIS P | Officer | 82,500 | 2009-05-15 | M |
| SAGE ANDREW G C II | Director | 76,000 | 2007-03-13 | M |
| STANKIEWICZ CHARLES W | Officer | 65,331 | 2011-08-23 | D |
| OLIVER DAVID R JR | Director | 63,823 | 2026-04-03 | A |
| HENRY DAVID A | Officer | 61,929 | 2016-07-31 | F |
| BUDHRAJA VIKRAM S | Director | 59,299 | 2022-06-10 | A |
| Collett John R | Officer | 54,100 | 2010-05-12 | A |
| House Arthur H | Director | 51,779 | 2026-04-03 | A |
| Maguire James F | Officer | 44,446 | 2016-07-31 | F |
| Winter Terry M | Officer | 43,839 | 2006-07-26 | A |
| DROUIN RICHARD | Director | 39,000 | 2014-04-01 | A |
| Littlefield Barbara G. | Director | 37,034 | 2026-09-18 | A |
| WOOD JOHN W JR | Director | 36,245 | 2019-05-24 | A |
| SANTAMARIA ANGELO R | Officer | 33,668 | 2011-08-12 | D |
| ROSA THOMAS M | Officer | 30,000 | 2007-03-16 | S |
| LENEHAN PAMELA F | Director | 27,172 | 2018-07-26 | A |
| SANDE JOHN VANDER | Director | 22,234 | 2017-07-26 | A |
| Klein Margaret D. | Director | 19,492 | 2026-04-03 | A |
| Dambier Laura A. | Director | 14,992 | 2026-06-11 | S |
| BACIOCCO ALBERT J JR | Director | 12,000 | 2007-05-21 | S |
| Donnelly Terence Robert | Director | 2,665 | 2026-04-03 | A |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-09-18 | Littlefield Barbara G. | Grant / award | 1,607 | $0.00 | 37,034 |
| 2026-06-11 | McGahn Daniel P | Open-market sale | 4,609 | $37.85 | 1,131,929 |
| 2026-06-11 | McGahn Daniel P | Open-market sale | 11,508 | $37.28 | 1,136,538 |
| 2026-06-11 | Kosiba John W JR | Open-market sale | 1,743 | $37.85 | 334,377 |
| 2026-06-11 | Kosiba John W JR | Open-market sale | 5,026 | $37.33 | 336,120 |
| 2026-06-11 | Dambier Laura A. | Open-market sale | 4,000 | $37.63 | 14,992 |
| 2026-06-08 | McGahn Daniel P | Open-market sale | 4,678 | $42.19 | 1,148,046 |
| 2026-06-08 | McGahn Daniel P | Open-market sale | 4,992 | $41.39 | 1,152,724 |
| 2026-06-08 | Kosiba John W JR | Open-market sale | 1,549 | $42.35 | 341,146 |
| 2026-06-08 | Kosiba John W JR | Open-market sale | 3,286 | $41.50 | 342,695 |
| 2026-06-03 | McGahn Daniel P | Open-market sale | 817 | $50.99 | 1,157,716 |
| 2026-06-03 | McGahn Daniel P | Open-market sale | 500 | $50.29 | 1,158,533 |
| 2026-06-03 | McGahn Daniel P | Open-market sale | 4,501 | $49.25 | 1,159,033 |
| 2026-06-03 | McGahn Daniel P | Open-market sale | 7,075 | $48.31 | 1,163,534 |
| 2026-06-03 | Kosiba John W JR | Open-market sale | 609 | $50.83 | 345,981 |
| 2026-06-03 | Kosiba John W JR | Open-market sale | 2,638 | $49.28 | 346,590 |
| 2026-06-03 | Kosiba John W JR | Open-market sale | 3,200 | $48.31 | 349,228 |
| 2026-06-02 | McGahn Daniel P | Open-market sale | 2,305 | $52.14 | 1,170,609 |
| 2026-06-02 | McGahn Daniel P | Open-market sale | 28,558 | $51.46 | 1,172,914 |
| 2026-06-02 | McGahn Daniel P | Open-market sale | 27,900 | $50.63 | 1,201,472 |
| 2026-06-02 | McGahn Daniel P | Open-market sale | 13,762 | $49.45 | 1,229,372 |
| 2026-06-02 | Kosiba John W JR | Open-market sale | 600 | $52.19 | 352,428 |
| 2026-06-02 | Kosiba John W JR | Open-market sale | 12,036 | $51.47 | 353,028 |
| 2026-06-02 | Kosiba John W JR | Open-market sale | 12,122 | $50.62 | 365,064 |
| 2026-06-02 | Kosiba John W JR | Open-market sale | 5,704 | $49.46 | 377,186 |
| 2026-06-01 | McGahn Daniel P | Grant / award | 60,000 | $0.00 | 1,243,134 |
| 2026-06-01 | Kosiba John W JR | Grant / award | 30,000 | $0.00 | 382,890 |
| 2026-04-03 | Dambier Laura A. | Grant / award | 3,116 | $0.00 | 18,992 |
| 2026-04-03 | House Arthur H | Grant / award | 3,116 | $0.00 | 51,779 |
| 2026-04-03 | Klein Margaret D. | Grant / award | 3,116 | $0.00 | 19,492 |
| 2026-04-03 | Littlefield Barbara G. | Grant / award | 3,116 | $0.00 | 35,427 |
| 2026-04-03 | OLIVER DAVID R JR | Grant / award | 3,116 | $0.00 | 63,823 |
| 2026-04-03 | Donnelly Terence Robert | Grant / award | 2,665 | $0.00 | 2,665 |
| 2026-02-24 | OLIVER DAVID R JR | Open-market sale | 200 | $34.10 | 60,707 |
| 2025-08-08 | House Arthur H | Open-market sale | 9,703 | $50.92 | 48,663 |
| 2025-08-06 | House Arthur H | Option exercise (derivative) | 9,703 | $0.00 | 0 |
| 2025-08-06 | House Arthur H | Option exercise | 9,703 | $6.80 | 58,366 |
| 2025-08-04 | Kosiba John W JR | Open-market sale | 9,843 | $55.26 | 0 |
| 2025-08-04 | Kosiba John W JR | Open-market sale | 15,740 | $55.13 | 352,890 |
| 2025-08-04 | Kosiba John W JR | Open-market sale | 34,260 | $54.34 | 368,630 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.