ACMR Form 144: 5,000 Shares Proposed Sale

ACMR submission notifies the proposed sale of 5,000 shares via a stock option exercise by an issuer-related plan on 05/19/2026.

Rhea-AI Filing Summary

ACMR submission notifies the proposed sale of 5,000 shares via a stock option exercise by an issuer-related plan on 05/19/2026. The filing shows prior sales of 5,000 shares on 03/09/2026 with a listed amount of $217,344.00.

The filing lists cash as the consideration method for the exercise and identifies the broker as Morgan Stanley Smith Barney LLC. The notice is an offering-related disclosure under Form 144 and records transaction details rather than company operating results.

Insights

Corporate Securities Counsel

Routine Form 144 notice showing a planned issuer-related exercise and resale of 5,000 shares.

The excerpt lists a stock option exercise dated 05/19/2026 for 5,000 shares, with cash as the consideration method and Morgan Stanley Smith Barney LLC named as broker. This is a disclosure of intent to sell under resale rules.

Timing and cash‑flow treatment are limited to the rows shown; subsequent filings or settlement confirmations would show actual sales and proceeds. Regulatory treatment is procedural—this notice itself does not alter the issuer's financial statements.

Key Figures

Proposed shares: 5,000 shares Listed amount: $331,119.50 Prior sale proceeds: $217,344.00 +2 more

5 metrics

Proposed shares 5,000 shares Stock option exercise dated 05/19/2026

Listed amount $331,119.50 Row amount associated with the 05/19/2026 entry in the excerpt

Prior sale proceeds $217,344.00 Securities sold on 03/09/2026 for 5,000 shares per the excerpt

Broker Morgan Stanley Smith Barney LLC Broker listed for the transaction in the filing excerpt

Market NASDAQ Market listed in the securities information row

Key Terms

Form 144, Stock Option Exercise, Issuer, Consideration: Cash

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.

Stock Option Exercise financial

"05/19/2026 | Stock Option Exercise"

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"

Consideration: Cash financial

"5000 | 05/19/2026 | Cash"

FAQ

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

What does ACMR's Form 144 report?

It reports a proposed sale of 5,000 shares via a stock option exercise dated 05/19/2026. The filing names Morgan Stanley Smith Barney LLC as broker and indicates cash as the consideration method; it is a disclosure of intent, not a record of settlement.

How many shares are listed and what are the dates on ACMR's filing?

The filing lists 5,000 shares with a principal transaction date of 05/19/2026. It also shows a prior sale of 5,000 shares on 03/09/2026 with an associated amount of $217,344.00 in the excerpt.

Who is the broker handling the transaction in the ACMR Form 144?

Morgan Stanley Smith Barney LLC is named as the broker in the excerpt. The filing provides the broker address and identifies the market as NASDAQ for the listed security information.

What proceeds or amounts are shown in the ACMR excerpt?

The excerpt shows amounts including $331,119.50 and $217,344.00 associated with listed share rows. Each figure appears alongside corresponding share counts and dates in the filing excerpt.

Does this Form 144 change ACMR's reported financial results?

No; the Form 144 is a resale/transfer notice and does not report operating results. It documents proposed sales and transaction details; any realized proceeds or company impact would appear in separate settlement confirmations or company disclosures.

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

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Accepted by SEC EDGAR 05/19/2026 - 04:19 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	0001721581
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	ACM RESEARCH, INC.
SEC File Number	001-38273
Address of Issuer	42307 Osgood Road, Suite I Fremont CALIFORNIA 94539
Phone	(510) 445-3700
Name of Person for Whose Account the Securities are To Be Sold	HAIPING DUN
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	Director

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	5000	331119.50	61233064	05/19/2026	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	05/19/2026	Stock Option Exercise	ISSUER			5000	05/19/2026	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
HAIPING DUN 42307 Osgood Road, Suite I Fremont CA 94539	Common	03/09/2026	5000	217344.00

144: Remarks and Signature

Remarks
Date of Notice	05/19/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	08/13/2025
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/ Haiping Dun
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)