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Form 8-K

sec.gov

8-K — AMERICAN SUPERCONDUCTOR CORP /DE/

Accession: 0001437749-26-018539

Filed: 2026-05-27

Period: 2026-05-27

CIK: 0000880807

SIC: 3621 (MOTORS & GENERATORS)

Item: Results of Operations and Financial Condition

Item: Financial Statements and Exhibits

Documents

8-K — amsc20260211_8k.htm (Primary)

EX-99.1 — EXHIBIT 99.1 (ex_919739.htm)

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8-K — FORM 8-K

8-K (Primary)

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amsc20260211_8k.htm

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0000880807

0000880807

2026-05-27

2026-05-27

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported):

May 27, 2026

American Superconductor Corporation

(Exact name of registrant as specified in its charter)

Delaware

000-19672

04-2959321

(State or other jurisdiction

(Commission

(IRS Employer

of incorporation)

File Number)

Identification No.)

114 East Main Street

Ayer, Massachusetts

01432

(Address of principal executive offices)

(Zip Code)

Registrant’s telephone number, including area code (978) 842-3000

Not Applicable

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐    Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common Stock, $0.01 par value per share

AMSC

Nasdaq Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02. Results of Operations and Financial Condition.

On May 27, 2026, American Superconductor Corporation (the “Company”) announced its financial results for the fourth quarter and full fiscal year ended March 31, 2026. The full text of the press release issued in connection with the announcement is attached as Exhibit 99.1 to this Current Report on Form 8-K.

The information in this Item 2.02 of this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits:

Exhibit

No.

Description

99.1

Press release issued by American Superconductor Corporation on May 27, 2026 (furnished, not “filed,” for purposes of Section 18 of the Exchange Act).

104

Cover Page Interactive Data File - the cover page XBRL tags are embedded within the Inline XBRL document.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

AMERICAN SUPERCONDUCTOR CORPORATION

Date:

May 27, 2026

By:

/S/ JOHN W. KOSIBA, JR.

John W. Kosiba, Jr.

Senior Vice President and Chief Financial Officer

EX-99.1 — EXHIBIT 99.1

EX-99.1

Filename: ex_919739.htm · Sequence: 2

ex_919739.htm

Exhibit 99.1

AMSC Reports Fourth Quarter and Fiscal Year 2025 Financial Results and Business Outlook

Business Highlights:

• Full year revenue surges 34% year-over-year to recent record of $299.2 million

• 12-month backlog expands nearly 40% year-over-year to approximately $280 million

Company to host conference call tomorrow, May 28 at 10:00 am ET

Ayer, MA – May 27, 2026 – AMSC (Nasdaq: AMSC), a leading provider of power control solutions that harmonize an increasingly complex energy system and enable customers to scale their operations without added complexity or size, today reported financial results for its fourth quarter and fiscal year ended March 31, 2026 ("fiscal 2025").

Revenues for the fourth quarter of fiscal 2025 were $86.4 million compared with $66.7 million for the same period of fiscal 2024. The year-over-year increase was driven by strong organic growth within our Grid and Wind businesses along with the contributions from the acquisition of Comtrafo.

AMSC’s net income for the fourth quarter of fiscal 2025 was $4.5 million, or $0.10 per share, compared to net income of $1.2 million, or $0.03 per share, for the same period of fiscal 2024. The Company’s non-GAAP net income for the fourth quarter of fiscal 2025 was $14.1 million, or $0.31 per share, compared with a non-GAAP net income of $4.8 million, or $0.13 per share, in the same period of fiscal 2024. Please refer to the financial table below for a reconciliation of GAAP to non-GAAP results.

Revenues for fiscal 2025 were $299.2 million as compared to $222.8 million in fiscal 2024. The year-over-year increase was driven by higher Grid and Wind revenues than in the prior fiscal year along with the contribution from the acquisition of Comtrafo.

AMSC reported net income for fiscal 2025 of $133.8 million, or $3.12 per share, compared to a net income of $6.0 million, or $0.16 per share in fiscal 2024, driven primarily by a non-cash tax benefit from the release of the majority of the Company's valuation allowance against deferred tax assets. The Company's non-GAAP net income for fiscal 2025 was $158.1 million, or $3.68 per share, compared with non-GAAP net income of $24.0 million, or $0.65 per share, for fiscal 2024. Please refer to the financial table below for a reconciliation of GAAP to non-GAAP results.

Cash, cash equivalents and restricted cash on March 31, 2026 totaled $147.6 million.

"AMSC delivered record quarterly and full-year results, reflecting exceptional strategic and operational execution," said Daniel P. McGahn, Chairman, President and CEO of AMSC. "We delivered a strong fourth quarter, with revenue up 30% year-over-year to over $86 million. For the full year, revenue grew 34% to nearly $300 million, driven primarily by 25% organic growth and supported by our recent acquisition to capture utility and industrial demand in Latin America. Fourth quarter orders approached $100 million, led by the traditional energy sector and surging data center demand within the utility market. We ended the year with our 12-month backlog up nearly 40% year-over-year to approximately $280 million. These results demonstrate our expanded addressable market and disciplined operational execution. We enter fiscal 2026 with a steadfast focus on powering progress and driving long-term success for AMSC customers."

AMSC Reports Q4FY25 Results

Page 2

Business Outlook

For the first quarter ending June 30, 2026, AMSC expects that its revenues will exceed $85.0 million. The Company’s net income for the first quarter of fiscal 2026 is expected to exceed $3.0 million, or $0.07 per share, excluding the impact from any changes in contingent consideration. The Company's non-GAAP net income (as defined below) is expected to exceed $8.0 million, or $0.17 per share.

Conference Call Reminder

In conjunction with this announcement, AMSC management will participate in a conference call with investors beginning at 10:00 a.m. Eastern Time on Thursday, May 28, 2026, to discuss the Company’s financial results and business outlook. Those who wish to listen to the live or archived conference call webcast should visit the “Investors” section of the Company’s website at https://ir.amsc.com. The live call can be accessed by dialing 1-844-481-2802 or 1-412-317-0675 and asking to join the AMSC call. A replay of the call may be accessed 2 hours following the call by dialing 1-855-669-9658 and using conference passcode 1468055.

About AMSC (Nasdaq: AMSC)

Guided by a belief in the power of next, AMSC is a leading provider of power controls solutions that apply innovation and creativity to address today's challenges and enable a more resilient and sustainable energy future. Driven by the purpose "to power progress," the Company integrates future-facing technologies to balance the global demand for clean energy with reliable, efficient power delivery. AMSC delivers advanced grid systems and engineering services to optimize network reliability, provides ship protection and power management solutions to enhance fleet efficiency and safety, and supplies electronic controls and designs that reduce wind energy costs. Beyond these systems, the Company provides capabilities in industrial process and control alongside environmental and emission control to ensure operational efficiency across the entire energy infrastructure. The Company's solutions are optimizing power network, increasing the safety of navy fleets, and powering gigawatts of renewable energy globally. Founded in 1987, AMSC is headquarters near Boston, Massachusetts with operations in Asia, Australia, Brazil, Europe, and North America. For more information, please visit www.amsc.com.

© 2026 AMSC, AMSC, American Superconductor, Comtrafo, Neeltran, NEPSI and NWL are trademarks or registered trademarks of American Superconductor Corporation. All other brand names, product names, trademarks or service marks belong to their respective holders.

AMSC Reports Q4FY25 Results

Page 3

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, as amended. We intend such forward-looking statements to be covered by the safe harbor provision for forward-looking statements contained in Section 27A of the Securities Act of 1933 as amended (the "Securities Act"), and Section 21E of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Any statements in this release regarding our goals and strategies; expanded addressable market and data center demand; order pipeline and backlog expectations; organic growth; acquisition integrations and benefits; business diversification, including through expanding end markets and entering new sectors; strengthening customer relationships; strong momentum; building a more resilient and profitable company; our expected GAAP and non-GAAP financial results for the quarter ending June 30, 2026; and other statements containing the words "believes," "anticipates," "plans," "expects," "will" and similar expressions, constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements represent management's current expectations and are inherently uncertain. There are a number of important factors that could materially impact the value of our common stock or cause actual results to differ materially from those indicated by such forward-looking statements. These important factors include, but are not limited to: If we fail to implement our business strategy successfully, our financial performance could be harmed; We may not realize all of the sales expected from our backlog of orders and contracts; We rely upon third-party suppliers for the components and subassemblies of many of our Grid and Wind products, making us vulnerable to supply shortages and price fluctuations, which could harm our business; We may acquire additional complementary businesses or technologies, which may require us to incur substantial costs for which we may never realize the anticipated benefits; Our business and operations may be materially adversely impacted in the event of a failure or security breach of our or any critical third parties’ IT Systems or Confidential Information; Our contracts with the U.S. and Canadian governments are subject to audit, modification or termination by such governments and include certain other provisions in favor of the governments. The continued funding of such contracts may remain subject to annual legislative appropriation, which, if not approved, could reduce our revenue and lower or eliminate our profit; Changes in U.S. government defense spending could negatively impact our financial position, results of operations, liquidity and overall business; Our performance on contracts with the U.S. Department of Defense may result in restrictions to our ability to repurchase our common stock or U.S. government denial of Foreign Military Sales or ceasing of assistance for international Direct Commercial Sales; Failure to comply with evolving data privacy and data protection laws, regulations, and other obligations, or to otherwise protect personal data, may adversely impact our business and financial results; Our success is dependent upon attracting and retaining qualified personnel and our inability to do so could significantly damage our business and prospects; A significant portion of our Wind segment revenues are derived from a single customer. If this customer’s business is negatively affected, it could adversely impact our business; Our success in addressing the wind energy market is dependent on the manufacturers that license our designs; Many of our revenue opportunities are dependent upon subcontractors and other business collaborators; Problems with product quality or product performance may cause us to incur warranty expenses or product liability charges and may damage our market reputation and prevent us from achieving increased sales and market share; Many of our customers outside of the United States may be either directly or indirectly related to governmental entities, and we could be adversely affected by violations of the United States Foreign Corrupt Practices Act and similar worldwide anti-bribery laws outside the United States; We have had limited success marketing and selling our superconductor products and system-level solutions, including our REG system, and our failure to more broadly market and sell our products and solutions could lower our revenue and cash flow; We or third parties on whom we depend may be adversely affected by natural disasters, including events resulting from climate change, and our business continuity and disaster recovery plans may not adequately protect us or our value chain from such events; Uncertainty surrounding our prospects and financial condition may have an adverse effect on our customer and supplier relationships; Pandemics, epidemics, or other public health crises may adversely impact our business, financial condition and results of operations; Changes in valuation allowance of deferred tax assets may affect our future operating results; If we fail to maintain proper and effective internal control over financial reporting on business acquisitions, our ability to produce accurate and timely financial statements could be impaired and may lead investors and other users to lose confidence in our financial data; We have not been historically profitable, and there can be no assurance that we will sustain our recent profitability; we have a history of negative operating cash flows, and we may require additional financing in the future, which may not be available to us; Changes in exchange rates could adversely affect our results of operations; We may be required to issue performance bonds, which restricts our ability to access any cash used as collateral for the bonds; Adverse changes in domestic and global economic conditions could adversely affect our operating results; The ongoing conflict between the United States, Israel, and Iran has disrupted global energy markets and supply chains and could adversely affect our business, financial condition, and results of operations; Our international operations are subject to risks that we do not face in the United States, which could have an adverse effect on our operating results; Our products face competition, which could limit our ability to acquire or retain customers; We have operations in, and depend on sales in, emerging markets, including Latin America and India, and global conditions could negatively affect our operating results or limit our ability to expand our operations outside of these markets. Changes in Brazil’s or India’s political, social, regulatory and economic environment may affect our financial performance; Industry consolidation could result in more powerful competitors and fewer customers; Evolving and varied expectations on environmental sustainability and social initiatives could adversely impact our business and financial results; Growth of the wind energy market depends largely on the availability and size of government subsidies, economic incentives and legislative programs designed to support the growth of wind energy; Lower prices for other energy sources may reduce the demand for wind energy development, which could have a material adverse effect on our ability to grow our Wind business; Our technology and products could infringe intellectual property rights of others, which may require costly litigation and, if we are not successful, could cause us to pay substantial damages and disrupt our business; We may be unable to adequately prevent disclosure of trade secrets and other proprietary information; Our patents may not provide meaningful or long-term protection for our technology, which could result in us losing some or all of our market position; Third parties have or may acquire patents that cover the materials, processes and technologies we use or may use in the future to manufacture our Amperium products, and our success depends on our ability to license such patents or other proprietary rights; There are a number of technological challenges that must be successfully addressed before our superconductor products can gain widespread commercial acceptance, and our inability to address such technological challenges could adversely affect our ability to acquire customers for our products; Our common stock has experienced, and may continue to experience, market price and volume fluctuations, which may prevent our stockholders from selling our common stock at a profit and could lead to costly litigation against us that could divert our management’s attention; Unfavorable results of legal proceedings could have a material adverse effect on our business, operating results and financial condition; and the other important factors discussed under the caption "Risk Factors" in Part 1. Item 1A of our Form 10-K for the fiscal year ended March 31, 2026, and our other reports filed with the SEC. These important factors, among others, could cause actual results to differ materially from those indicated by forward-looking statements made herein and presented elsewhere by management from time to time. Any such forward-looking statements represent management's estimates as of the date of this press release. While we may elect to update such forward-looking statements at some point in the future, we disclaim any obligation to do so, even if subsequent events cause our views to change. These forward-looking statements should not be relied upon as representing our views as of any date subsequent to the date of this press release.

AMSC Reports Q4FY25 Results

Page 4

UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per share data)

Three Months Ended

Twelve Months Ended

March 31,

March 31,

2026

2025

2026

2025

Revenues

Grid

$

73,701

$

55,592

$

251,317

$

187,170

Wind

12,705

11,063

47,838

35,648

Total revenues

86,406

66,655

299,155

222,818

Cost of revenues

62,807

48,964

207,776

160,964

Gross margin

23,600

17,691

91,379

61,854

Operating expenses:

Research and development

4,167

3,493

15,744

11,425

Selling, general and administrative

14,596

12,101

57,647

43,091

Amortization of acquisition related intangibles

1,187

444

2,371

1,733

Change in fair value of contingent consideration

4,171

4,171

6,682

Total operating expenses

24,122

16,038

79,934

62,931

Operating income (loss)

(522

)

1,653

11,445

(1,077

)

Interest income, net

1,158

807

6,356

3,708

Other expense, net

(1,110

)

(49

)

(1,053

)

(265

)

Income (loss) before income tax (benefit) expense

(474

)

2,411

16,748

2,366

Income tax (benefit) expense

(5,004

)

1,204

(117,061

)

(3,667

)

Net income

$

4,530

$

1,207

$

133,809

$

6,033

Net income per common share

Basic

0.10

0.03

3.12

0.16

Diluted

0.10

0.03

3.05

0.16

Weighted average number of common shares outstanding

Basic

45,723

37,672

42,945

36,990

Diluted

46,733

38,516

43,902

37,718

AMSC Reports Q4FY25 Results

Page 5

CONSOLIDATED BALANCE SHEET

(In thousands, except per share data)

March 31,

March 31,

2026

2025

ASSETS

Current assets:

Cash and cash equivalents

$

140,693

$

79,494

Accounts receivable, net

69,381

46,186

Inventory, net

103,748

71,169

Prepaid expenses and other current assets

14,367

8,055

Restricted cash

3,548

1,613

Total current assets

331,737

206,517

Property, plant and equipment, net

89,775

38,572

Intangibles, net

13,548

5,916

Right-of-use assets

3,897

3,829

Goodwill

175,376

48,164

Restricted cash

3,312

4,274

Deferred tax assets

119,474

1,178

Equity-method Investments

1,333

1,113

Other assets

1,029

958

Total assets

$

739,481

$

310,521

LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:

Accounts payable and accrued expenses

$

46,545

$

32,282

Lease liability, current portion

1,238

685

Contingent consideration, current portion

12,808

Deferred revenue, current portion

77,936

66,797

Total current liabilities

138,527

99,764

Deferred revenue, long term portion

15,395

9,336

Lease liability, long term portion

2,762

2,684

Deferred tax liabilities

1,595

Contingent consideration, long term portion

26,721

Other liabilities

629

28

Total liabilities

184,034

113,407

Stockholders' equity:

Common stock, $0.01 par value, 75,000,000 shares authorized; 48,035,691 and 39,887,536 shares issued and 47,632,340 and 39,484,185 shares outstanding at March 31, 2026 and 2025, respectively

480

399

Additional paid-in capital

1,481,476

1,259,540

Treasury stock, at cost, 403,351 at March 31, 2026 and 2025

(3,765

)

(3,765

)

Accumulated other comprehensive income

4,072

1,565

Accumulated deficit

(926,816

)

(1,060,625

)

Total stockholders' equity

555,447

197,114

Total liabilities and stockholders' equity

$

739,481

$

310,521

AMSC Reports Q4FY25 Results

Page 6

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

Year Ended March 31,

2026

2025

Cash flows from operating activities:

Net income

$

133,809

$

6,033

Adjustments to reconcile net income to net cash provided by operations:

Depreciation and amortization

7,386

5,560

Stock-based compensation expense

15,869

7,794

Provision for excess and obsolete inventory

3,497

1,532

Amortization of operating lease right-of-use assets

1,068

976

Deferred income taxes

(118,683

)

(4,304

)

Earnings (loss) from equity method investments

(220

)

132

Change in fair value of contingent consideration

4,171

6,682

Other non-cash items

316

(587

)

Unrealized foreign exchange gain on cash and cash equivalents

(2

)

(41

)

Changes in operating asset and liability accounts:

Accounts receivable

(16,292

)

(3,213

)

Inventory

(6,961

)

(7,707

)

Prepaid expenses and other current assets

(598

)

543

Operating leases

(503

)

(1,563

)

Accounts payable and accrued expenses

7,142

3,209

Deferred revenue

(6,851

)

13,239

Net cash provided by operating activities

23,148

28,285

Cash flows from investing activities:

Purchases of property, plant and equipment

(4,888

)

(2,415

)

Cash paid to settle NWL contingent consideration liability

(3,278

)

Cash paid for acquisition, net of cash acquired

(72,096

)

(29,577

)

Change in other assets

(98

)

64

Net cash used in investing activities

(77,082

)

(35,206

)

Cash flows from financing activities:

Repurchase of treasury stock

(126

)

Repayment of debt

(8,809

)

(25

)

Cash paid related to registration of common stock shares

(148

)

Proceeds from public equity offering, net of offering expenses

124,501

Proceeds from exercise of employee stock options and ESPP

391

307

Net cash provided by financing activities

116,082

8

Effect of exchange rate changes on cash, cash equivalents and restricted cash

24

14

Net (decrease) increase in cash, cash equivalents and restricted cash

62,172

(6,899

)

Cash, cash equivalents and restricted cash at beginning of year

85,381

92,280

Cash, cash equivalents and restricted cash at end of year

$

147,553

$

85,381

AMSC Reports Q4FY25 Results

Page 7

RECONCILIATION OF GAAP NET INCOME TO NON-GAAP NET INCOME

(In thousands, except per share data)

Three Months Ended March 31,

Year Ended March 31,

2026

2025

2026

2025

Net income

$

4,530

$

1,207

$

133,809

$

6,033

Stock-based compensation

3,755

2,855

15,869

7,794

Amortization of acquisition-related intangibles

1,732

706

3,024

2,433

Change in fair value of contingent consideration

4,171

4,171

6,682

Acquisition costs

(43

)

1,243

1,095

Non-GAAP net income

14,145

4,768

158,116

24,037

Non-GAAP net income per share - basic

$

0.31

$

0.13

$

3.68

$

0.65

Non-GAAP net income per share - diluted

$

0.30

$

0.12

$

3.60

$

0.64

Weighted average shares outstanding - basic

45,723

37,672

42,945

36,990

Weighted average shares outstanding - diluted

46,733

38,516

43,902

37,718

Reconciliation of Forecast GAAP Net Income to Non-GAAP Net Income

(In millions, except per share data)

Three months ending

June 30, 2026

Net income

$

3.0

Stock-based compensation

4.2

Amortization of acquisition-related intangibles

0.8

Non-GAAP net income

$

8.0

Non-GAAP net income per share

$

0.17

Shares outstanding

46.0

AMSC Reports Q4FY25 Results

Page 8

Note: Non-GAAP net income is defined by the Company as net income before; stock-based compensation; amortization of acquisition-related intangibles; change in fair value of contingent consideration; acquisition costs; other non-cash or unusual charges, and the tax effect of adjustments calculated at the relevant rate for our non-GAAP metric. The Company believes non-GAAP net income and non-GAAP net income per share assist management and investors in comparing the Company’s performance across reporting periods on a consistent basis by excluding these non-cash, non-recurring or other charges that it does not believe are indicative of its core operating performance. Actual GAAP and non-GAAP net income and net income per share for the fiscal quarter ending June 30, 2026, including the above adjustments, may differ materially from those forecasted in the table above, including as a result of changes in the fair value of contingent consideration.

Generally, a non-GAAP financial measure is a numerical measure of a company's performance, financial position or cash flow that either excludes or includes amounts that are not normally excluded or included in the most directly comparable measure calculated and presented in accordance with GAAP. The non-GAAP measures included in this release, however, should be considered in addition to, and not as a substitute for or superior to, net income or other measures of financial performance prepared in accordance with GAAP. A reconciliation of GAAP to non-GAAP net income is set forth in the table above. Non-GAAP net income per share is defined as non-GAAP net income divided by shares outstanding.

AMSC Contacts

Investor Relations Contact:

Carolyn Capaccio, CFA

(212) 838-3777

Email: amscIR@allianceadvisors.com

AMSC Director, Communications:

Nicol Golez

Phone: (978) 399-8344

Email: Nicol.Golez@amsc.com

Public Relations Contact:

RooneyPartners

Joe Luongo

(914) 906-5903

Email: jluongo@rooneypartners.com

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XML — IDEA: XBRL DOCUMENT

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Filename: R1.htm · Sequence: 11

v3.26.1

Document And Entity Information

May 27, 2026

Document Information [Line Items]

Entity, Registrant Name

American Superconductor Corporation

Document, Type

8-K

Document, Period End Date

May 27, 2026

Entity, Incorporation, State or Country Code

DE

Entity, File Number

000-19672

Entity, Tax Identification Number

04-2959321

Entity, Address, Address Line One

114 East Main Street

Entity, Address, City or Town

Ayer

Entity, Address, State or Province

MA

Entity, Address, Postal Zip Code

01432

City Area Code

978

Local Phone Number

842-3000

Written Communications

false

Soliciting Material

false

Pre-commencement Tender Offer

false

Pre-commencement Issuer Tender Offer

false

Title of 12(b) Security

Common Stock

Trading Symbol

AMSC

Security Exchange Name

NASDAQ

Entity, Emerging Growth Company

false

Amendment Flag

false

Entity, Central Index Key

0000880807

X

- Definition

Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

+ References

No definition available.

+ Details

Name:

dei_AmendmentFlag

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Area code of city

+ References

No definition available.

+ Details

Name:

dei_CityAreaCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:

dei_DocumentInformationLineItems

Namespace Prefix:

dei_

Data Type:

xbrli:stringItemType

Balance Type:

na

Period Type:

duration

X

- Definition

For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

+ References

No definition available.

+ Details

Name:

dei_DocumentPeriodEndDate

Namespace Prefix:

dei_

Data Type:

xbrli:dateItemType

Balance Type:

na

Period Type:

duration

X

- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

+ References

No definition available.

+ Details

Name:

dei_DocumentType

Namespace Prefix:

dei_

Data Type:

dei:submissionTypeItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Address Line 1 such as Attn, Building Name, Street Name

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine1

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Name of the City or Town

+ References

No definition available.

+ Details

Name:

dei_EntityAddressCityOrTown

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Code for the postal or zip code

+ References

No definition available.

+ Details

Name:

dei_EntityAddressPostalZipCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Name of the state or province.

+ References

No definition available.

+ Details

Name:

dei_EntityAddressStateOrProvince

Namespace Prefix:

dei_

Data Type:

dei:stateOrProvinceItemType

Balance Type:

na

Period Type:

duration

X

- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityCentralIndexKey

Namespace Prefix:

dei_

Data Type:

dei:centralIndexKeyItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Indicate if registrant meets the emerging growth company criteria.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityEmergingGrowthCompany

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

+ References

No definition available.

+ Details

Name:

dei_EntityFileNumber

Namespace Prefix:

dei_

Data Type:

dei:fileNumberItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Two-character EDGAR code representing the state or country of incorporation.

+ References

No definition available.

+ Details

Name:

dei_EntityIncorporationStateCountryCode

Namespace Prefix:

dei_

Data Type:

dei:edgarStateCountryItemType

Balance Type:

na

Period Type:

duration

X

- Definition

The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityRegistrantName

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

na

Period Type:

duration

X

- Definition

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityTaxIdentificationNumber

Namespace Prefix:

dei_

Data Type:

dei:employerIdItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Local phone number for entity.

+ References

No definition available.

+ Details

Name:

dei_LocalPhoneNumber

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 13e

-Subsection 4c

+ Details

Name:

dei_PreCommencementIssuerTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14d

-Subsection 2b

+ Details

Name:

dei_PreCommencementTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Title of a 12(b) registered security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b

+ Details

Name:

dei_Security12bTitle

Namespace Prefix:

dei_

Data Type:

dei:securityTitleItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Name of the Exchange on which a security is registered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection d1-1

+ Details

Name:

dei_SecurityExchangeName

Namespace Prefix:

dei_

Data Type:

dei:edgarExchangeCodeItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14a

-Subsection 12

+ Details

Name:

dei_SolicitingMaterial

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

No definition available.

+ Details

Name:

dei_TradingSymbol

Namespace Prefix:

dei_

Data Type:

dei:tradingSymbolItemType

Balance Type:

na

Period Type:

duration

X

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 230

-Section 425

+ Details

Name:

dei_WrittenCommunications

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

na

Period Type:

duration