American Superconductor grants 1,607 shares to ex-director

Departing director Barbara G. Littlefield received an immediately vested stock award and now directly holds 37,034 AMSC shares.

Rhea-AI Filing Summary

AMERICAN SUPERCONDUCTOR CORP (symbol: AMSC) is the issuer of record for a Form 4 filing submitted to the SEC. Littlefield Barbara G. reported acquisition or exercise transactions in this Form 4 filing.

AMERICAN SUPERCONDUCTOR CORP (AMSC) reported that director Barbara G. Littlefield received a grant of 1,607 shares of common stock on September 18, 2026. The award consisted of immediately vested shares granted in connection with her departure from the Board under the Amended and Restated 2007 Director Stock Plan. Following this award, she holds 37,034 shares directly. No Rule 10b5-1 trading plan is reported.

Insider Trade Summary

Grant/Award: 1,607 shares

Grant/Award 1 txn

Insider Littlefield Barbara G.

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1, F2	1,607	$0.00	$0.00

Holdings After Transaction: Common Stock — 37,034 shares (Direct)

Footnotes (2)

1. F1. This award of immediately vested shares of American Superconductor Corporation (the "Company") common stock was made in connection with Ms. Littlefield's departure from the Company's Board in accordance with the Company's Amended and Restated 2007 Director Stock Plan, as Amended.
2. F2. Following all the transactions reported on this Form 4, the reporting person holds 37,034 shares directly.

Key Figures

Shares granted: 1,607 shares Price per share for award: $0.00 per share Shares held after transaction: 37,034 shares +1 more

4 metrics

Shares granted 1,607 shares Immediately vested common stock award on September 18, 2026

Price per share for award $0.00 per share Reported transaction price for the 1,607-share grant

Shares held after transaction 37,034 shares Direct holdings of Barbara G. Littlefield following all transactions on this Form 4

Transaction date September 18, 2026 Date of the immediately vested stock award

Key Terms

immediately vested shares, Amended and Restated 2007 Director Stock Plan, grant, award, or other acquisition

3 terms

immediately vested shares financial

"This award of immediately vested shares of American Superconductor Corporation common stock"

Amended and Restated 2007 Director Stock Plan financial

"in accordance with the Company's Amended and Restated 2007 Director Stock Plan"

grant, award, or other acquisition financial

"transaction code describes a Grant, award, or other acquisition"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did AMSC report for Barbara G. Littlefield?

Barbara G. Littlefield received an award of 1,607 shares of American Superconductor common stock on September 18, 2026, as immediately vested shares granted in connection with her departure from the company’s Board under its Amended and Restated 2007 Director Stock Plan.

How many AMSC shares does Barbara G. Littlefield own after this Form 4?

After the reported award, Barbara G. Littlefield directly holds 37,034 shares of American Superconductor common stock. This figure is stated as her direct holdings following all transactions reported on this Form 4.

Was the AMSC stock award to Barbara G. Littlefield a market purchase?

No. The 1,607-share transaction is reported with a price of $0.00 per share and is described as a grant or award of immediately vested shares in connection with her Board departure, not an open-market purchase.

Is the AMSC insider transaction tied to a Rule 10b5-1 trading plan?

No. The filing’s Rule 10b5-1 checkbox is not marked, and the award is described as a compensatory grant made under the company’s Amended and Restated 2007 Director Stock Plan in connection with Ms. Littlefield’s Board departure.

What role did Barbara G. Littlefield have at AMSC related to this Form 4?

Barbara G. Littlefield is identified as a director of American Superconductor. The filing notes that the immediately vested stock award was made in connection with her departure from the company’s Board under the Amended and Restated 2007 Director Stock Plan.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/21/2026 - 05:22 PM Accepted by SEC EDGAR 09/21/2026 - 05:22 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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hours per response:			0.5

X

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Littlefield Barbara G.

(Last) (First) (Middle)

C/O AMERICAN SUPERCONDUCTOR CORPORATION

114 EAST MAIN STREET

(Street)

AYER MASSACHUSETTS 01432

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
AMERICAN SUPERCONDUCTOR CORP /DE/ [ AMSC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/18/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/18/2026(1)		A		1,607	A	$0	37,034(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. This award of immediately vested shares of American Superconductor Corporation (the "Company") common stock was made in connection with Ms. Littlefield's departure from the Company's Board in accordance with the Company's Amended and Restated 2007 Director Stock Plan, as Amended.

2. Following all the transactions reported on this Form 4, the reporting person holds 37,034 shares directly.

	/s/ John R. Samia, Attorney-in-Fact	09/21/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)