AMSCNasdaq

AMERICAN SUPERCONDUCTOR CORP /DE/

Alert me on AMSC

Insider buys, 6 months

Congress trades, 6 months

Signals, 6 months

Six months

After each filing

Jun 13 Sale Dambier Laura A. Insider

1 week

+1.4%S&P −2.6%

1 month

−19.4%S&P −0.3%

3 months

−32.6%S&P +0.6%

6 months

Result in24 trading days

Jun 12 Sale Kosiba John W JR Insider

1 week

+13.3%S&P +0.6%

1 month

−11.8%S&P +2.0%

3 months

−31.8%S&P +2.8%

6 months

Result in23 trading days

Jun 12 Sale McGahn Daniel P Insider

1 week

+13.3%S&P +0.6%

1 month

−11.8%S&P +2.0%

3 months

−31.8%S&P +2.8%

6 months

Result in23 trading days

Jun 11 Sale McGahn Daniel P Insider

1 week

+9.8%S&P +1.5%

1 month

−10.3%S&P +2.2%

3 months

−25.3%S&P +3.9%

6 months

Result in22 trading days

Jun 11 Sale Kosiba John W JR Insider

1 week

+9.8%S&P +1.5%

1 month

−10.3%S&P +2.2%

3 months

−25.3%S&P +3.9%

6 months

Result in22 trading days

Show all 9

Jun 4 Sale Kosiba John W JR Insider

1 week

−14.8%S&P −2.6%

1 month

−23.4%S&P −1.0%

3 months

−37.5%S&P +2.4%

6 months

Result in17 trading days

Jun 4 Sale McGahn Daniel P Insider

1 week

−14.8%S&P −2.6%

1 month

−23.4%S&P −1.0%

3 months

−37.5%S&P +2.4%

6 months

Result in17 trading days

Feb 27 Sale OLIVER DAVID R JR Insider

1 week

−15.0%S&P −2.0%

1 month

−1.1%S&P −7.6%

3 months

+56.4%S&P +10.6%

6 months

−12.6%S&P +12.7%

Nov 14, 2025 Buy OLIVER DAVID R JR Insider

1 week

−10.4%S&P −1.9%

1 month

−8.0%S&P +1.0%

3 months

+2.6%S&P +2.4%

6 months

+38.9%S&P +9.8%

Every purchase and sale on this ticker reported by a member of Congress or an insider, measured from the close of the first trading day after it became public to the close 1 week, 1 month, 3 months and 6 months later, each beside the S&P over the same days.

Filings for AMSC

29 held · newest 529 held · newest 2

Loading the filings.

See all 29 filings for AMSC

Aeon news and offers by email

New sources, new features and offers like our founding price. A few times a month at most. Stop any time.

Signal history

No signal for this ticker yet. A signal is written when insider buying here scores one dot or more.

Stakes

Jun 30, 2026 Schedule 13G, amended

Vanguard Capital Management: 4.9%, 2,390,425 shares

Mar 31, 2026 Schedule 13G

Vanguard Capital Management: 5%, 2,384,736 shares

Mar 13, 2026 Schedule 13G, amended

The Vanguard Group: 0%, 0 shares

Dec 31, 2025 Schedule 13G, amended

The Vanguard Group: 7.4%, 3,526,632 shares

Schedule 13D is filed within 5 business days of crossing 5 percent by an investor who may seek to influence the company. Schedule 13G is filed by a passive holder, and a large institution has up to 45 days after the quarter end.

Government contracts, last 12 months

Awards of $10M and up, from USAspending · context, not a signal

No contracts of $10M or more in the last 12 months.

Lobbying

Last four quarters

$50KQ4 2025

$50KQ1 2026

$200KQ2 2026

$50KQ3 2026

Down 75 percent from Q2 2026. Reported by the company to the Senate each quarter.Original report ↗

Read from LDA.gov between Sep 23, 2026 and Oct 24, 2026. Senate Office of Public Records cannot vouch for the data or analyses derived from these data after the data have been retrieved from LDA.gov.