ACMR (NASDAQ: ACMR) Form 144 shows 13,351-share sale and 5,399 exercise

Rhea-AI Filing Summary

ACMR notices a proposed sale of Common Stock via a Form 144 filing. The excerpt lists a Stock Option Exercise with an entry of 5,399 shares dated 06/05/2026 and a reported sale of 13,351 shares on 06/04/2026 for $1,136,821.63.

Insights

Securities Compliance Specialist

Form 144 notifies the market of proposed resale activity; amounts and dates are listed.

The filing excerpt lists a Stock Option Exercise entry for 5,399 shares dated 06/05/2026 and a separate reported sale of 13,351 shares on 06/04/2026 with proceeds of $1,136,821.63. These items are presented as disclosures of intended or recent transactions.

Timing and cash‑flow treatment beyond the shown dates are not described in the excerpt. Subsequent filings or broker confirmations would show execution details and who receives proceeds.

Key Figures

Stock option exercise quantity: 5,399 shares Reported sale quantity: 13,351 shares Proceeds from reported sale: $1,136,821.63 +1 more

4 metrics

Stock option exercise quantity 5,399 shares Stock Option Exercise dated 06/05/2026

Reported sale quantity 13,351 shares Sale dated 06/04/2026

Proceeds from reported sale $1,136,821.63 Proceeds reported for 13,351-share sale on 06/04/2026

Filing date shown 06/05/2026 Date associated with securities entries

Key Terms

Form 144, Stock Option Exercise, Issuer

3 terms

Form 144 regulatory

"lists a proposed sale via a Form 144 filing"

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.

Stock Option Exercise financial

"entry labeled Stock Option Exercise dated 06/05/2026"

A stock option exercise is the act of using a previously granted right to buy shares of a company's stock at a specific, predetermined price by paying that price and receiving the shares. It matters to investors because exercising changes who owns the shares (which can dilute existing ownership), can trigger taxable events and shift potential gains or losses, and affects voting power and the company’s outstanding share count—like turning a voucher into an actual product that becomes part of circulating supply.

Issuer regulatory

"Stock Option Exercise | ISSUER | 5399 | 06/05/2026"

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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	5399	449079.64	61233064	06/05/2026	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	Stock Option Exercise	ISSUER			5399	06/05/2026	Cash

* 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
SOTHEARA CHEAV 42307 Osgood Road, Suite I Fremont CA 94539	Common	06/04/2026	13351	1136821.63

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 ACMR's Form 144 disclose?

The Form 144 lists proposed or recent resale activity of Common Stock, including a 5,399-share stock option exercise dated 06/05/2026 and a reported sale of 13,351 shares on 06/04/2026 for $1,136,821.63.

Who is the broker or intermediary on the filing for ACMR?

The excerpt names Morgan Stanley Smith Barney LLC at an address entry associated with the securities information, indicating that broker‑dealer involvement is recorded in the filing details.

Does the Form 144 show proceeds received by ACMR?

The listed sale shows proceeds of $1,136,821.63 tied to the 13,351-share sale on 06/04/2026. The filing does not state whether the issuer received those proceeds.

Are the transactions on Form 144 completed or proposed?

Form 144 typically notifies proposed resales; the excerpt includes a sale dated 06/04/2026 and an exercise dated 06/05/2026, indicating both a recent sale and a recorded exercise in the provided lines.

How much stock is referenced for the stock option exercise?

The excerpt contains an entry labeled Stock Option Exercise with a quantity of 5,399 shares dated 06/05/2026, as shown in the securities section.