American Superconductor Corporation (AMSC) Insider Trading

Last 12 months

Insiders bought $2k and sold $7.8M on the open market.

98% of the selling was scheduled in advance under 10b5-1 plans. Director Laura A. Dambier sold $151k on Jun 11, 21% of their stake, outside a plan.

Net open-market

−$7.79M

1 buy · 8 sales

Under a 10b5-1 plan

98%

of the value sold

Insiders who bought / sold

1 / 4

executives and directors

Last open-market buy

Nov 2025

Nov 13, 2025

Get an email when AMSC's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Jun 11	Laura A. Dambier Director	SoldNo plan	4,000	$37.63	$151k	21%	Form 4
Jun 11	John W Kosiba Jr SVP, CFO & Treasurer	Sold10b5-1 plan 2 parts	6,769	$37.46 average	$254k	2.0%	Form 4
Jun 11	Daniel P McGahn Chairman, President and CEO	Sold10b5-1 plan 2 parts	16,117	$37.44 average	$603k	1.4%	Form 4
Jun 8	John W Kosiba Jr SVP, CFO & Treasurer	Sold10b5-1 plan 2 parts	4,835	$41.77 average	$202k	1.4%	Form 4
Jun 8	Daniel P McGahn Chairman, President and CEO	Sold10b5-1 plan 2 parts	9,670	$41.78 average	$404k	0.8%	Form 4
Jun 2 – 3	John W Kosiba Jr SVP, CFO & Treasurer	Sold10b5-1 plan 7 parts	36,909	$50.45 average	$1.86M	9.6%	Form 4
Jun 2 – 3	Daniel P McGahn Chairman, President and CEO	Sold10b5-1 plan 8 parts	85,418	$50.49 average	$4.31M	6.8%	Form 4
Feb 24	David R Oliver Jr Director	SoldNo plan	200	$34.10	$7k	0.3%	Form 4
Nov 13, 2025	David R Oliver Jr Director	Bought	200	$8.33	$2k	0.3%	Form 4
Aug 8, 2025	Arthur H House Director	SoldNo plan	9,703	$50.92	$494k	17%	Form 4
Aug 4, 2025	Daniel P McGahn Chairman, President and CEO	SoldNo plan 2 parts	100,848	$54.49 average	$5.5M	7.8%	Form 4
Aug 4, 2025	John W Kosiba Jr SVP, CFO & Treasurer	SoldNo plan 3 parts	59,843	$54.70 average	$3.27M	14%	Form 4
Jun 11, 2025	Daniel P McGahn Chairman, President and CEO	Sold10b5-1 plan 2 parts	12,815	$28.58 average	$366k	1.0%	Form 4
Jun 11, 2025	John W Kosiba Jr SVP, CFO & Treasurer	Sold10b5-1 plan 2 parts	6,642	$28.57 average	$190k	1.6%	Form 4
Jun 6, 2025	John W Kosiba Jr SVP, CFO & Treasurer	Sold10b5-1 plan	4,744	$31.83	$151k	1.1%	Form 4
Jun 6, 2025	Daniel P McGahn Chairman, President and CEO	Sold10b5-1 plan	7,689	$31.82	$245k	0.6%	Form 4
May 27, 2025	Daniel P McGahn Chairman, President and CEO	Sold10b5-1 plan 2 parts	122,655	$26.39 average	$3.24M	8.5%	Form 4
May 27, 2025	John W Kosiba Jr SVP, CFO & Treasurer	Sold10b5-1 plan 2 parts	50,000	$26.40 average	$1.32M	11%	Form 4
May 20, 2025	John W Kosiba Jr SVP, CFO & Treasurer	Sold10b5-1 plan	11,860	$24.50	$291k	2.4%	Form 4
May 20, 2025	Daniel P McGahn Chairman, President and CEO	Sold10b5-1 plan	12,815	$24.49	$314k	0.9%	Form 4
Nov 4, 2024	John W Kosiba Jr SVP, CFO & Treasurer	SoldNo plan	50,000	$28.28	$1.41M	12%	Form 4

Jun 11No plan
Laura A. Dambier
Director · sold 4,000 at $37.63
$151k
21% of stake
Jun 1110b5-1 plan
John W Kosiba Jr
SVP, CFO & Treasurer · sold 6,769 at avg $37.46
$254k
2.0% of stake
Jun 1110b5-1 plan
Daniel P McGahn
Chairman, President and CEO · sold 16,117 at avg $37.44
$603k
1.4% of stake
Jun 810b5-1 plan
John W Kosiba Jr
SVP, CFO & Treasurer · sold 4,835 at avg $41.77
$202k
1.4% of stake
Jun 810b5-1 plan
Daniel P McGahn
Chairman, President and CEO · sold 9,670 at avg $41.78
$404k
0.8% of stake
Jun 2 – 310b5-1 plan
John W Kosiba Jr
SVP, CFO & Treasurer · sold 36,909 at avg $50.45
$1.86M
9.6% of stake
Jun 2 – 310b5-1 plan
Daniel P McGahn
Chairman, President and CEO · sold 85,418 at avg $50.49
$4.31M
6.8% of stake
Feb 24No plan
David R Oliver Jr
Director · sold 200 at $34.10
$7k
0.3% of stake
Nov 13, 2025
David R Oliver Jr
Director · bought 200 at $8.33
$2k
0.3% of stake
Aug 8, 2025No plan
Arthur H House
Director · sold 9,703 at $50.92
$494k
17% of stake
Aug 4, 2025No plan
Daniel P McGahn
Chairman, President and CEO · sold 100,848 at avg $54.49
$5.5M
7.8% of stake
Aug 4, 2025No plan
John W Kosiba Jr
SVP, CFO & Treasurer · sold 59,843 at avg $54.70
$3.27M
14% of stake
Jun 11, 202510b5-1 plan
Daniel P McGahn
Chairman, President and CEO · sold 12,815 at avg $28.58
$366k
1.0% of stake
Jun 11, 202510b5-1 plan
John W Kosiba Jr
SVP, CFO & Treasurer · sold 6,642 at avg $28.57
$190k
1.6% of stake
Jun 6, 202510b5-1 plan
John W Kosiba Jr
SVP, CFO & Treasurer · sold 4,744 at $31.83
$151k
1.1% of stake
Jun 6, 202510b5-1 plan
Daniel P McGahn
Chairman, President and CEO · sold 7,689 at $31.82
$245k
0.6% of stake
May 27, 202510b5-1 plan
Daniel P McGahn
Chairman, President and CEO · sold 122,655 at avg $26.39
$3.24M
8.5% of stake
May 27, 202510b5-1 plan
John W Kosiba Jr
SVP, CFO & Treasurer · sold 50,000 at avg $26.40
$1.32M
11% of stake
May 20, 202510b5-1 plan
John W Kosiba Jr
SVP, CFO & Treasurer · sold 11,860 at $24.50
$291k
2.4% of stake
May 20, 202510b5-1 plan
Daniel P McGahn
Chairman, President and CEO · sold 12,815 at $24.49
$314k
0.9% of stake
Nov 4, 2024No plan
John W Kosiba Jr
SVP, CFO & Treasurer · sold 50,000 at $28.28
$1.41M
12% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch AMSC, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in AMSC's SEC filings or

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Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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