# EDGAR Filing Document

**Accession Number:** 0000880807
**File Stem:** 0001193125-25-330930
**Filing Date:** 2025-12
**Character Count:** 9071
**Document Hash:** a68d8ec205a31136a1ca758190eb8d56
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-330930.hdr.sgml**: 20251223

**ACCESSION NUMBER**: 0001193125-25-330930

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 15

**CONFORMED PERIOD OF REPORT**: 20251223

**ITEM INFORMATION**: Other Events

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20251223

**DATE AS OF CHANGE**: 20251223

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** AMERICAN SUPERCONDUCTOR CORP /DE/
- **CENTRAL INDEX KEY:** 0000880807
- **STANDARD INDUSTRIAL CLASSIFICATION:** MOTORS & GENERATORS [3621]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 042959321
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 0331

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-19672
- **FILM NUMBER:** 251600648

**BUSINESS ADDRESS:**
- **STREET 1:** SIXTY FOUR JACKSON ROAD
- **CITY:** DEVENS
- **STATE:** MA
- **ZIP:** 01434
- **BUSINESS PHONE:** 9788423000

**MAIL ADDRESS:**
- **STREET 1:** SIXTY FOUR JACKSON ROAD
- **CITY:** DEVENS
- **STATE:** MA
- **ZIP:** 01434

?xml version='1.0' encoding='ASCII'? 8-K

### 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):

#### December 23, 2025

## American Superconductor Corporation

#### (Exact name of registrant as specified in its charter)

---

| | | |
|:---|:---|:---|
| **Delaware** | **000-19672** | **04-2959321** |
| **(State or other jurisdiction**<br> **of incorporation)** | **(Commission**<br> **File Number)** | **(IRS Employer**<br> **Identification No.)** |

---

---

| | |
|:---|:---|
| **114 East Main Street**<br> **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<br>Symbol(s)** | **Name of each exchange**<br> **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 8.01.** | **Other Events.**  |

---

On December 23, 2025, American Superconductor Corporation (the "<u>Company</u>") filed a prospectus supplement with the Securities and Exchange Commission (the "<u>SEC</u>") relating to shares of the Company's common stock to be sold from time to time by certain selling stockholders of the Company. The prospectus supplement forms a part of the Company's Registration Statement on Form S-3 (Reg. No. 333-281496), which was filed with the SEC and became effective on August 12, 2024.

Latham & Watkins LLP, counsel to the Company, has issued an opinion to the Company, dated December 23, 2025, regarding the validity of such shares. A copy of the opinion is filed as Exhibit 5.1 to this Current Report on Form 8-K.

---

| | |
|:---|:---|
| **Item 9.01** | **Financial Statements and Exhibits**  |

---

(d) *Exhibits*:

---

| | |
|:---|:---|
| 5.1 | [Opinion of Latham & Watkins LLP](d36453dex51.htm) |
| 23.1 | [Consent of Latham & Watkins LLP (included in Exhibit 5.1)](d36453dex51.htm) |
| 104 | Cover Page Interactive Data File (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 | AMERICAN SUPERCONDUCTOR CORPORATION |
| Date: December 23, 2025 | By: | /S/ JOHN W. KOSIBA, JR. |
|  |  | **John W. Kosiba, Jr.** |
|  |  | *Senior Vice President and Chief Financial Officer* |

---

## Exhibit 5.1

**Exhibit 5.1** 

---

| | | |
|:---|:---|:---|
|  | 200 Clarendon Street | 200 Clarendon Street |
|  | Boston, Massachusetts 02116 | Boston, Massachusetts 02116 |
|  | Tel: +1.617.948.6000 Fax: +1.617.948.6001 | Tel: +1.617.948.6000 Fax: +1.617.948.6001 |
|  | www.lw.com |  |
| ![LOGO](g36453dsp001.jpg) | FIRM / AFFILIATE OFFICES | FIRM / AFFILIATE OFFICES |
| ![LOGO](g36453dsp001.jpg) | Austin | Milan |
| ![LOGO](g36453dsp001.jpg) | Beijing | Munich |
| ![LOGO](g36453dsp001.jpg) | Boston | New York |
| ![LOGO](g36453dsp001.jpg) | Brussels | Orange County |
| ![LOGO](g36453dsp001.jpg) | Chicago | Paris |
| ![LOGO](g36453dsp001.jpg) | Dubai | Riyadh |
| ![LOGO](g36453dsp001.jpg) | Düsseldorf | San Diego |
| December 23, 2025 | Frankfurt | San Francisco |
|  | Hamburg | Seoul |
|  | Hong Kong | Silicon Valley |
|  | Houston | Singapore |
|  | London | Tel Aviv |
|  | Los Angeles | Tokyo |
| American Superconductor Corporation<br> 114 East Main Street<br> Ayer, MA 01432 | Madrid | Washington, D.C. |

---

---

| | |
|:---|:---|
| Re: | Registration Statement on Form S-3 (Reg. No. 333-281496); 2,417,142 shares of Common Stock, par value $0.01 per share  |

---

To the addressee set forth above:

We have acted as special counsel to American Superconductor Corporation, a Delaware corporation (the "Company"), in connection with the resale from time to time by the selling stockholders (the "Selling Stockholders") named in the Registration Statement (as defined below) of 2,417,142 shares of common stock, $0.01 par value per share (the "Shares"). The Shares are included in a registration statement on Form S–3 under the Securities Act of 1933, as amended (the "Act"), filed with the Securities and Exchange Commission (the "Commission") on August 12, 2024 (Registration No. 333-281496) (the "Registration Statement"). This opinion is being furnished in connection with the requirements of Item 601(b)(5) of Regulation S-K under the Act, and no opinion is expressed herein as to any matter pertaining to the contents of the Registration Statement or related Prospectus, other than as expressly stated herein with respect to the issue of the Shares.

As such counsel, we have examined such matters of fact and questions of law as we have considered appropriate for purposes of this letter. With your consent, we have relied upon certificates and other assurances of officers of the Company and others as to factual matters without having independently verified such factual matters. We are opining herein as to General Corporation Law of the State of Delaware, and we express no opinion with respect to any other laws.

Subject to the foregoing and the other matters set forth herein, it is our opinion that, as of the date hereof, the issue of the Shares has been duly authorized by all necessary corporate action of the Company, and the Shares are validly issued, fully paid and nonassessable.

------

**December 23, 2025** 

**Page 2**![LOGO](g36453g1223042102012.jpg)

In rendering the foregoing opinion, we have assumed that the Company will comply with all applicable notice requirements regarding uncertificated shares provided in the General Corporation Law of the State of Delaware.

This opinion is for your benefit in connection with the Registration Statement and may be relied upon by you and by persons entitled to rely upon it pursuant to the applicable provisions of the Act. We consent to your filing this opinion as an exhibit to the Company's Form 8-K dated December 23, 2025 and to the reference to our firm in the Prospectus under the heading "Validity of the Common Stock." In giving such consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Commission thereunder.

---

| |
|:---|
| Sincerely, |
| /s/ LATHAM & WATKINS LLP |

---