ACM Research insider plans $406K stock sale

ACM Research, Inc. (ACMR) insider Haiping Dun filed a notice to sell common stock under Rule 144.

Rhea-AI Filing Summary

ACM Research, Inc. (ACMR) insider Haiping Dun filed a notice to sell common stock under Rule 144. The notice covers a proposed sale of 5,000 shares, expected on 08/18/2026, in connection with a stock option exercise, with brokerage arrangements through Morgan Stanley Smith Barney LLC. The filing also reports that Haiping Dun sold 5,000 shares of ACM Research common stock on 05/19/2026 for total consideration of $331,119.50.

Key Figures

Proposed shares to be sold: 5,000 shares Proposed aggregate sale value: $405,663.00 Prior 3-month shares sold: 5,000 shares +3 more

6 metrics

Proposed shares to be sold 5,000 shares Planned Rule 144 sale of ACM Research common stock on 08/18/2026

Proposed aggregate sale value $405,663.00 Value tied to the 5,000-share planned sale on 08/18/2026

Prior 3-month shares sold 5,000 shares Shares of ACM Research common stock sold on 05/19/2026

Prior 3-month sale proceeds $331,119.50 Total consideration for 5,000 shares sold on 05/19/2026

Planned transaction date 08/18/2026 Date of proposed Rule 144 sale and stock option exercise

Signature date 08/13/2025 Date Haiping Dun signed the Form 144 notice

Key Terms

Rule 144, Stock Option Exercise, aggregate value

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

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.

Stock Option Exercise financial

"Common | 08/18/2026 | Stock Option Exercise | Issuer"

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.

aggregate value financial

"Common | Morgan Stanley Smith Barney LLC ... | 5000 | 405663.00"

FAQ

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

What does the Form 144 filing report for ACMR insider Haiping Dun?

The filing reports that Haiping Dun intends to sell 5,000 shares of ACM Research common stock on 08/18/2026 in connection with a stock option exercise, and previously sold 5,000 shares on 05/19/2026.

How many ACMR shares are proposed to be sold under this Form 144?

The notice covers a proposed sale of 5,000 shares of ACM Research common stock. These shares are tied to a stock option exercise and are planned to be sold for cash through a brokerage firm.

What was the value of ACMR shares sold by Haiping Dun in the past three months?

Haiping Dun sold 5,000 shares of ACM Research common stock on 05/19/2026 for total proceeds of $331,119.50. This transaction is disclosed as part of the three-month sales history required under Rule 144.

Which broker is involved in the proposed ACMR stock sale under Form 144?

The proposed sale of 5,000 ACM Research shares is arranged through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004, as disclosed in the Form 144 filing.

What is the proposed aggregate value of the new ACMR sale in the Form 144?

The proposed sale of 5,000 ACM Research shares has an indicated aggregate value of $405,663.00. This amount reflects the total dollar value associated with the planned Rule 144 transaction on 08/18/2026.

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

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Accepted by SEC EDGAR 08/18/2026 - 04:05 PM EDT 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	405663.00	64657388	08/18/2026	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	08/18/2026	Stock Option Exercise	Issuer			5000	08/18/2026	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	05/19/2026	5000	331119.50

144: Remarks and Signature

Remarks
Date of Notice	08/18/2026
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)