Company · Ownership research

AMERICAN SUPERCONDUCTOR CORP /DE/ AMSC

CIK 0000880807

Form 4 transactions dated Nov 1, 2023 to Nov 8, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

Insider filings on file run through Sep 21, 2026.

Insider purchases & sales

Purchased: $0.00
Sold: $26.82M

Nov 1, 2023 – Sep 21, 2026
Available records · partial months are marked ·

202610 of 10 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
Jun 11, 2026	Dambier Laura A. Director	Sale	$150.52K 4,000 shares sold	21.06% sold Direct holding	▾
Jun 11, 2026	Kosiba John W JR SVP, CFO & Treasurer	Sale10b5-1 footnote	$253.58K 6,769 shares sold	1.98% sold Direct holding	▾
Jun 11, 2026	McGahn Daniel P Chairman, President and CEO · Director	Sale10b5-1 footnote	$603.50K 16,117 shares sold	1.40% sold Direct holding	▾
Jun 8, 2026	Kosiba John W JR SVP, CFO & Treasurer	Sale10b5-1 footnote	$201.97K 4,835 shares sold	1.40% sold Direct holding	▾
Jun 8, 2026	McGahn Daniel P Chairman, President and CEO · Director	Sale10b5-1 footnote	$404.00K 9,670 shares sold	0.84% sold Direct holding	▾
Jun 3, 2026	Kosiba John W JR SVP, CFO & Treasurer	Sale10b5-1 footnote	$315.55K 6,447 shares sold	1.83% sold Direct holding	▾
Jun 3, 2026	McGahn Daniel P Chairman, President and CEO · Director	Sale10b5-1 footnote	$630.26K 12,893 shares sold	1.10% sold Direct holding	▾
Jun 2, 2026	Kosiba John W JR SVP, CFO & Treasurer	Sale10b5-1 footnote	$1.55M 30,462 shares sold	7.96% sold Direct holding	▾
Jun 2, 2026	McGahn Daniel P Chairman, President and CEO · Director	Sale10b5-1 footnote	$3.68M 72,525 shares sold	5.83% sold Direct holding	▾
Feb 24, 2026	OLIVER DAVID R JR Director	Sale	$6.82K 200 shares sold	0.33% sold Direct holding	▾

Showing 10 / 10 record groups in 2026. The complete set is available through the API.

AMERICAN SUPERCONDUCTOR CORP /DE/ · AMSC

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{"action":"list","ticker":"AMSC","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Share totals are on today's split-adjusted basis. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.