AMSC insider files to sell 4,835 shares

John Kosiba submitted a Rule 144 notice reporting a proposed sale of 4,835 shares of Common Stock of AMSC through Morgan Stanley Smith Barney LLC.

Rhea-AI Filing Summary

John Kosiba submitted a Rule 144 notice reporting a proposed sale of 4,835 shares of Common Stock of AMSC through Morgan Stanley Smith Barney LLC. The filing shows an aggregate value of $201,966.65 and lists 47,694,445 shares outstanding as of 06/08/2026. The notice also reports prior sales of 6,447 shares on 06/03/2026 for $315,547.77 and 30,462 shares on 06/02/2026 for $1,546,485.68.

Insights

Securities Compliance Expert

Notice under Rule 144 reporting proposed disposition of restricted shares.

The filing lists a proposed sale of $201,966.65 worth of 4,835 shares of restricted Common Stock via Morgan Stanley Smith Barney LLC, with the securities labeled Restricted Stock and sale method noted as Issuer. Timing in the entry is 06/05/2026.

Past dealer-reported dispositions are included: 6,447 shares on 06/03/2026 and 30,462 shares on 06/02/2026. Compliance implications hinge on meeting Rule 144 conditions; the filing itself is a notice of intent to sell, not a transfer of title.

Key Figures

Proposed shares to be sold: 4,835 shares Aggregate value: $201,966.65 Shares outstanding: 47,694,445 shares +2 more

5 metrics

Proposed shares to be sold 4,835 shares sale entry dated 06/05/2026

Aggregate value $201,966.65 value listed on the 06/05/2026 line

Shares outstanding 47,694,445 shares as of 06/08/2026

Prior sale on 06/03/2026 6,447 shares / $315,547.77 sale reported by John Kosiba

Prior sale on 06/02/2026 30,462 shares / $1,546,485.68 sale reported by John Kosiba

Key Terms

Rule 144, Restricted Stock, Issuer

3 terms

Rule 144 regulatory

"submitted a Rule 144 notice reporting a proposed sale"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock financial

"06/05/2026 | Restricted Stock | ISSUER"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

Issuer regulatory

"Restricted Stock | ISSUER"

FAQ

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

What did AMSC insider John Kosiba report in the Form 144?

The Form 144 reports a proposed sale of 4,835 shares of Common Stock valued at $201,966.65. The filing also lists prior sales of 6,447 shares and 30,462 shares on 06/03/2026 and 06/02/2026, respectively.

Who is handling the reported sale for AMSC (AMSC)?

The notice identifies Morgan Stanley Smith Barney LLC as the broker handling the transaction. The broker address is listed as 1 New York Plaza, 8th Floor, New York, NY in the filing details.

What type of securities are being sold under this Form 144?

The securities are listed as Common stock and specifically marked as Restricted Stock. The filing indicates the sale method or source as Issuer for the 06/05/2026 entry.

How many AMSC shares were outstanding as shown in the filing?

The filing shows 47,694,445 shares outstanding as of 06/08/2026. This figure appears on the same line as the proposed sale entry and provides a context number in the notice.

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

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Accepted by SEC EDGAR 06/08/2026 - 04:18 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001703463
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	AMERICAN SUPERCONDUCTOR CORPORATION
SEC File Number	000-19672
Address of Issuer	114 East Main Street Ayer MASSACHUSETTS 01432
Phone	(978) 842-3000
Name of Person for Whose Account the Securities are To Be Sold	JOHN KOSIBA
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	4835	201966.65	47694445	06/08/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	06/05/2026	Restricted Stock	ISSUER			4835	06/05/2026	Not Applicable

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
JOHN KOSIBA 114 East Main Street Ayer MA 01432	Common	06/03/2026	6447	315547.77
JOHN KOSIBA 114 East Main Street Ayer MA 01432	Common	06/02/2026	30462	1546485.68

144: Remarks and Signature

Remarks
Date of Notice	06/08/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	08/15/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ John William Kosiba
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)