AMSC (NASDAQ: AMSC) files Form 144 for 6,769-share sale via Morgan Stanley

Rhea-AI Filing Summary

AMSC submitted a Form 144 notice reporting a proposed sale of 6,769 shares of Common stock through Morgan Stanley Smith Barney LLC, dated 06/10/2026. The filing also lists recent sales by John Kosiba: 30,462 shares on 06/02/2026, 6,447 shares on 06/03/2026, and 4,835 shares on 06/08/2026, with the dollar amounts shown alongside each trade.

Insights

Equity Compliance Analyst

Routine Rule 144 notice listing a small proposed resale and recent insider dispositions.

The filing records a proposed sale of 6,769 shares to be handled by Morgan Stanley Smith Barney LLC on 06/10/2026. It also documents three recent dispositions by John Kosiba on 06/02/2026, 06/03/2026, and 06/08/2026

These entries are procedural filings under Rule 144; cash‑flow treatment and any holding-period or volume‑limit qualifiers are not detailed in the excerpt. Subsequent trade confirmations or broker disclosures would show execution and settlement details.

Key Figures

Proposed sale: 6,769 shares Prior sale: 30,462 shares Prior sale: 6,447 shares +2 more

5 metrics

Proposed sale 6,769 shares scheduled sale on 06/10/2026 via Morgan Stanley Smith Barney LLC

Prior sale 30,462 shares sold by John Kosiba on 06/02/2026

Prior sale 6,447 shares sold by John Kosiba on 06/03/2026

Prior sale 4,835 shares sold by John Kosiba on 06/08/2026

Dollar amount (example) $1,546,485.68 amount shown for the 06/02/2026 sale by John Kosiba

Key Terms

Form 144, Restricted Stock, Issuer, Broker-dealer

4 terms

Form 144 regulatory

"144: Securities To Be Sold"

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.

Restricted Stock financial

"Common | 06/10/2026 | 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.

Issuer regulatory

"Restricted Stock | ISSUER |"

Broker-dealer financial

"Morgan Stanley Smith Barney LLC Executive Financial Services"

A broker-dealer is a licensed firm or individual that both executes trades on behalf of clients (acting as a broker) and buys or sells securities for its own account (acting as a dealer). Investors care because broker-dealers provide the plumbing of markets — they place orders, hold or move cash and securities, offer research or advice, and their stability and fees directly affect trade execution, costs, and the safety of client funds; think of them as a combined travel agent and taxi for your investments.

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

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Available on EDGAR 06/11/2026 - 04:34 PM Accepted by SEC EDGAR 06/11/2026 - 04:34 PM Learn about SEC filing dates

FAQ

What does AMSC's Form 144 disclose?

It discloses a proposed sale of 6,769 shares through Morgan Stanley Smith Barney LLC on 06/10/2026. The filing also lists three recent dispositions by John Kosiba on 06/02, 06/03, and 06/08 with amounts shown.

Who is listed as the broker in the AMSC Form 144?

The filing shows Morgan Stanley Smith Barney LLC as the broker handling the proposed sale. The broker address and routing appear on the notice; execution and settlement details would be in post‑trade confirmations.

How many shares did John Kosiba sell recently according to the filing?

The notice reports three sales by John Kosiba: 30,462 shares on 06/02/2026, 6,447 shares on 06/03/2026, and 4,835 shares on 06/08/2026. Dollar amounts are included next to each trade.

Does the Form 144 state proceeds or prices for the listed sales?

Yes; the filing lists dollar amounts adjacent to each reported disposition (for example, $1,546,485.68 for one sale). The notice shows proceeds per trade but not settlement or execution confirmations.

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	6769	253578.92	47694445	06/11/2026	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	06/10/2026	Restricted Stock	ISSUER			6769	06/10/2026	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	06/08/2026	4835	201966.65
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

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)