American Superconductor

AMSC on Nasdaq. American Superconductor sells power control systems and software to utilities and industrial customers. Market value $1.5bn.

Watch this stockFree. We tell you when something changes.

Price checks use the past 12 months to June 2026. Quality checks use five annual reports, the latest for the year to March 2026.

We can't read total debt from the filing, so debt is left out.

Should I look at this?

Look carefully before going further

Read the warning sign in its own filings

This is not advice. Check the numbers below.

Compare with another stock

Cash yield
past 12 months to June 2026
1.3%low

For every $100 of what the whole company costs, it produced $1.33 of spare cash in the past 12 months. A savings account pays about $4.

Price to profit
past 12 months to June 2026
n/a

The filings do not give us enough to work this out.

Return on capital
five annual reports to March 2026
-24.2%five-year median

Each dollar kept in the business earns -24 cents a year. Above 10 is good.

Quality score: 42 of 100. Price score: 57 of 100. Our list needs 70 on quality and 60 on price.

$31.85 a share, 28% above its 1-year low

Over the past year the price has ranged from $24.87 to $70.49.

Pays no dividend

Prices from Tuesday’s close (6 October).

Five years of cash, in billions

-0.0
-0.0
0.0
0.0
0.0
0.0
2022202320242025202612 monthsto Jun '26
Revenue
$108m$106m$146m$223m$299m
Operating margin
-19.4%-31.1%-7.8%-0.5%3.8%
Debt to equity
0.000.000.00n/an/a
Shares outstanding
0.03bn0.03bn0.04bn0.05bn0.05bn

Health checks

  • Free cash flow positive3 of 5 years
  • Accounting looks honest (Beneish)Not enough data
  • Financial strength (Piotroski)5 of 8 checks we could run
  • Profit backed by cash (accruals)No
  • DebtUnknown
  • Revenue growth, five yearsStrong, 28.0% a year
  • Buying back its own sharesNo, 64% more shares since 2022

The quarter to June 2026

How the business did, compared with the same quarter a year earlier.

  • Sales: $94 million last quarter, up 30% on a year ago.
  • Profit: $9 million, up 41% on a year ago.
  • It keeps 5 cents of each $1 of sales as operating profit, up from 3 cents a year earlier.
  • Spare cash over the past 12 months: $21 million, down from $26 million.
  • 19% more shares than a year ago. Each share owns a bit less of the company.
  • Sales grew on a year ago in each of the last 4 quarters.
Sales by quarter
Sales by quarter
Quarter toAmount
September 2024$54m
December 2024$61m
March 2025$67m
June 2025$72m
September 2025$66m
December 2025$75m
March 2026$86m
June 2026$94m
Profit by quarter
Profit by quarter
Quarter toAmount
September 2024$5m
December 2024$2m
March 2025$1m
June 2025$7m
September 2025$5m
December 2025$118m
March 2026$5m
June 2026$9m

From the company's quarterly reports to the SEC.

Dates

Next results (estimated)
n/a
Last annual report (10-K)
27 May 2026
Next quarterly (estimated, 10-Q)
4 November 2026

Who owns it

2 long-term investors we follow own it, down from 3 last quarter. 279 funds in all.

Jun '25
Dec '25
Jun '26

Sold out this quarter

Largest holders overall

From 13F filings for the quarter ended 30 June 2026.

Big holders and activists

1 investor owns more than 5%.

From Schedule 13D and 13G filings: anyone owning more than 5% must file one.

What insiders did

No insider bought shares on the open market in the last 12 months. 4 sold $8m, $8m of it under preset trading plans.

  • Dambier Laura A.
    Director
    Sold
    Date
    11 June 2026
    Shares
    4,000
    Price
    $37.63
    Value
    $150,520
  • Kosiba John W JR
    SVP, CFO & Treasurer
    Sold
    under a preset trading plan
    Date
    11 June 2026
    Shares
    6,769
    Price
    $37.46
    Value
    $253,593
  • McGahn Daniel P
    Chairman, President and CEO, Director
    Sold
    under a preset trading plan
    Date
    11 June 2026
    Shares
    16,117
    Price
    $37.44
    Value
    $603,469
  • Kosiba John W JR
    SVP, CFO & Treasurer
    Sold
    under a preset trading plan
    Date
    8 June 2026
    Shares
    4,835
    Price
    $41.77
    Value
    $201,969
  • McGahn Daniel P
    Chairman, President and CEO, Director
    Sold
    under a preset trading plan
    Date
    8 June 2026
    Shares
    9,670
    Price
    $41.78
    Value
    $403,984
  • Kosiba John W JR
    SVP, CFO & Treasurer
    Sold
    under a preset trading plan
    Date
    3 June 2026
    Shares
    6,447
    Price
    $48.95
    Value
    $315,548
  • McGahn Daniel P
    Chairman, President and CEO, Director
    Sold
    under a preset trading plan
    Date
    3 June 2026
    Shares
    12,893
    Price
    $48.88
    Value
    $630,271
  • Kosiba John W JR
    SVP, CFO & Treasurer
    Sold
    under a preset trading plan
    Date
    2 June 2026
    Shares
    30,462
    Price
    $50.77
    Value
    $2m
  • McGahn Daniel P
    Chairman, President and CEO, Director
    Sold
    under a preset trading plan
    Date
    2 June 2026
    Shares
    72,525
    Price
    $50.78
    Value
    $4m
  • OLIVER DAVID R JR
    Director
    Sold
    Date
    24 February 2026
    Shares
    200
    Price
    $34.10
    Value
    $6,820

From Form 4 filings: insiders must report trades in their own company's shares within two days.

Warning signs in its filings

Problems the company itself reported to the SEC, in its own words.

1 serious warning sign in American Superconductor’s filings.

We look for five warning signs: doubt it can keep going, weak checks on its own accounts, a notice that its past accounts can't be relied on, a change of auditor, and one customer bringing in a big share of sales. We don't check lawsuits, investigations or debt yet.

We checked the auditor's report, internal controls, restatement notices, auditor changes and big customers in the 10-K filed 27 May 2026, plus the 10-Q filed 5 Aug 2026 and 3 later 8-Ks.

  • Weak checks on its own accounts

    Serious

    The company said its checks on its own accounts did not work at the end of its latest quarter. Mistakes could slip into the numbers.

    “Based on such evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures were not effective at the reasonable assurance level as of June 30, 2026, due to the material weakness in our internal control over financial reporting that management is in the process of remediating.”
    Show the full paragraph
    Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures as of June 30, 2026 . The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the Company’s management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. In making this evaluation, our management considered the material weakness in our internal control over financial reporting that was disclosed in our Annual Report on Form 10-K for the year ended March 31, 2026 filed on May 27, 2026, described below. Based on such evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures were not effective at the reasonable assurance level as of June 30, 2026, due to the material weakness in our internal control over financial reporting that management is in the process of remediating.

    From the 10-Q filed 5 August 2026, Part I, Item 4. Controls and Procedures. Read it in the filing

A 10-K is the yearly report every US company files with the SEC. An 8-K is a short notice of a big event.

What could go wrong

  • Profits run ahead of cash.

Whether the price already reflects the risks is what the deep dive is for.

The deep dive

Everything above is arithmetic on public filings. The deep dive reads the last ten years of annual reports, the proxy statements, and the earnings calls, then argues the case the way Buffett, Klarman, and Hohn would, and checks every claim against the source.

  • What the business is worth, as a range, and the margin of safety at today’s price
  • Prices to start buying, buy, and buy hard
  • The three things that would make this a mistake
  • Every number footnoted to the filing it came from
Create a free account to run it

Your first deep dive is free.

What a finished deep dive looks like

Not advice. Numbers on this page come from SEC filings and are updated each night; prices are updated again after the US market closes. The five-year figures are rounded.