Company · Ownership research

AMERICAN SUPERCONDUCTOR CORP /DE/ AMSC

CIK 0000880807

Form 4 transactions dated Nov 1, 2023 to Nov 7, 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 ·

202510 of 12 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
Aug 8, 2025	House Arthur H Director	Sale	$494.08K 9,703 shares sold	16.62% sold Direct holding	▾
Aug 4, 2025	McGahn Daniel P Chairman, President and CEO · Director	Sale	$5.50M 100,848 shares sold	7.85% sold Direct holding	▾
Aug 4, 2025	Kosiba John W JR SVP, CFO & Treasurer	Sale	$2.73M 50,000 shares sold	12.41% sold Direct holding	▾
Aug 4, 2025	Kosiba John W JR SVP, CFO & Treasurer	Sale	$543.92K 9,843 shares sold	100.00% sold Indirect holding	▾
Jun 11, 2025	McGahn Daniel P Chairman, President and CEO · Director	Sale10b5-1 footnote	$366.24K 12,815 shares sold	0.99% sold Direct holding	▾
Jun 11, 2025	Kosiba John W JR SVP, CFO & Treasurer	Sale10b5-1 footnote	$189.78K 6,642 shares sold	1.62% sold Direct holding	▾
Jun 6, 2025	Kosiba John W JR SVP, CFO & Treasurer	Sale10b5-1 footnote	$151.01K 4,744 shares sold	1.15% sold Direct holding	▾
Jun 6, 2025	McGahn Daniel P Chairman, President and CEO · Director	Sale10b5-1 footnote	$244.67K 7,689 shares sold	0.59% sold Direct holding	▾
May 27, 2025	McGahn Daniel P Chairman, President and CEO · Director	Sale10b5-1 footnote	$3.24M 122,655 shares sold	8.59% sold Direct holding	▾
May 27, 2025	Kosiba John W JR SVP, CFO & Treasurer	Sale10b5-1 footnote	$1.32M 50,000 shares sold	10.77% sold Direct holding	▾

Showing 12 / 12 record groups in 2025. 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.