Rule 144: Morgan Stanley broker files sale of 12,893 shares (AMSC)

Rhea-AI Filing Summary

Morgan Stanley Smith Barney LLC submitted a Rule 144 notice reporting a proposed sale of 12,893 shares of Common Stock held as Restricted Stock, dated 06/02/2026. The filing shows prior sales of 72,525 shares during the past three months and lists Daniel McGahn as the holder.

Insights

Securities Counsel

Rule 144 notice for a proposed restricted-share sale; routine compliance filing.

The form lists a proposed sale of 12,893 shares of Restricted Stock with an execution date of 06/02/2026. It also records 72,525 shares sold in the prior three months.

Such filings notify the market of an intended sale under resale safe-harbors; cash-flow treatment and exact sale method are not specified in the excerpt.

Key Figures

Proposed shares to be sold: 12,893 shares Shares sold in past 3 months: 72,525 shares Numeric amount listed: 630,265.28 +2 more

5 metrics

Proposed shares to be sold 12,893 shares Securities To Be Sold; dated 06/02/2026

Shares sold in past 3 months 72,525 shares Securities Sold During The Past 3 Months

Numeric amount listed 630,265.28 appears in filer line (exact label not provided in excerpt)

Numeric amount listed 3,682,892.03 appears alongside prior-sales line (exact label not provided in excerpt)

Identifier number 47,694,445 numeric string present in header lines of the excerpt

Key Terms

Restricted Stock, Rule 144, Issuer

3 terms

Restricted Stock financial

"Securities To Be Sold ... Restricted Stock ... 06/02/2026"

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.

Rule 144 regulatory

"144: Filer Information"

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.

Issuer regulatory

"Securities To Be Sold ... 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

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	12893	630265.28	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			12893	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
DANIEL MCGAHN 114 East Main Street Ayer MA 01432	Common	06/02/2026	72525	3682892.03

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 for AMSC report?

The form reports a proposed sale of 12,893 shares of Common Stock dated 06/02/2026. It also records that 72,525 shares were sold in the prior three months by the holder listed.

Who is shown as the holder or seller on this filing?

Daniel McGahn is listed with an address in Ayer, MA. The filing associates the proposed sale with Morgan Stanley Smith Barney LLC as the broker/executor.

Are the shares described as restricted or unrestricted?

The filing identifies the securities as Restricted Stock for the 12,893 shares proposed for sale on 06/02/2026. No further transferability conditions are provided in the excerpt.

Does the filing state proceeds or dollar amounts?

The excerpt lists numeric amounts including 630,265.28 and 3,682,892.03, but it does not attach explicit labels describing proceeds or price per share in plain text within the provided excerpt.