AMSC (NASDAQ: AMSC) Form 144: proposed sale of 6,447 restricted shares

Rhea-AI Filing Summary

AMSC: A Form 144 notice reports a proposed sale of 6,447 shares of Common Stock identified as restricted stock, dated 06/02/2026. The filing names John Kosiba and Morgan Stanley Smith Barney LLC as the broker/placement agent.

The excerpt also shows 30,462 shares of Common Stock were sold in the past three months on 06/02/2026 for an aggregate amount of $1,546,485.68. Shares outstanding are listed as 47,694,445 as of 06/03/2026.

Insights

Corporate Governance Analyst

Routine Form 144 notice for a restricted‑share sale by an insider or related party.

The filing lists 6,447 shares of restricted Common Stock proposed for sale on 06/02/2026

Past sales of 30,462 shares for $1,546,485.68 are disclosed in the same excerpt; cash‑flow treatment and any lockup conditions are not stated in the excerpt.

Key Figures

Proposed sale: 6,447 shares Recent sales (past 3 months): 30,462 shares Aggregate amount reported: $1,546,485.68 +1 more

4 metrics

Proposed sale 6,447 shares restricted Common Stock, sale date 06/02/2026

Recent sales (past 3 months) 30,462 shares sold on 06/02/2026

Aggregate amount reported $1,546,485.68 proceeds for 30,462 shares (06/02/2026)

Shares outstanding 47,694,445 as of 06/03/2026

Key Terms

Restricted Stock, Form 144, Issuer

3 terms

Restricted Stock financial

"Securities To Be Sold Common | 06/02/2026 | Restricted Stock"

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.

Form 144 regulatory

"Filer Information | 144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Issuer regulatory

"Securities To Be Sold | ... | Restricted Stock | ISSUER"

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	6447	315547.77	47694445	06/03/2026	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	06/02/2026	Restricted Stock	ISSUER			6447	06/02/2026	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	06/02/2026	30462	1546485.68

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the Form 144 filed for AMSC (AMSC) report?

The Form 144 reports a proposed sale of 6,447 shares of restricted Common Stock dated 06/02/2026. It names Morgan Stanley Smith Barney LLC as the broker and lists John Kosiba in the filing.

How many shares were sold by the reporting person in the past three months?

The excerpt shows 30,462 shares were sold on 06/02/2026 for an aggregate of $1,546,485.68. The entry is listed under 'Securities Sold During The Past 3 Months.'

Does the filing state the class and type of securities being sold?

Yes. The securities are identified as Common stock and described as Restricted Stock with the sale method labeled ISSUER on 06/02/2026.

What baseline share count is shown in the excerpt for AMSC?

The excerpt lists 47,694,445 shares outstanding with an associated date of 06/03/2026. This figure appears in the filer information section of the excerpt.