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  4. [Form 4] ACM Research, Inc. Insider Trading Activity

ACMR insider trades: 30,000 options exercised, 30,000 shares sold

Filing Impact
(Very High)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

ACM Research (ACMR): insider Form 4 shows option exercises and sales. An officer reported exercising 15,000 stock options at $5.60 on 11/12/2025 and another 15,000 at $5.60 on 11/13/2025. On the same dates, 15,000 shares were sold at $32.76 and 15,000 shares at $33.77, respectively.

The sales were made under a Rule 10b5-1 trading plan adopted on 08/13/2025. Following each day’s transactions, the filing lists 50,001 shares beneficially owned directly. The exercised options were fully vested and carry an expiration date of 04/22/2029.

Positive

  • None.

Negative

  • None.
Insider Feng Lisa
Role See remarks
Sold 30,000 shs ($998K)
Type Security Shares Price Value
Exercise Stock Option 15,000 $0.00 --
Exercise Class A Common Stock 15,000 $5.60 $84K
Sale Class A Common Stock 15,000 $33.77 $507K
Exercise Stock Option 15,000 $0.00 --
Exercise Class A Common Stock 15,000 $5.60 $84K
Sale Class A Common Stock 15,000 $32.76 $491K
Holdings After Transaction: Stock Option — 0 shares (Direct); Class A Common Stock — 65,001 shares (Direct)
Footnotes (1)
  1. On November 12, 2025, the reporting person exercised a previously issued stock option to purchase 15,000 shares of Class A Common Stock of the Issuer. The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 13, 2025. On November 13, 2025, the reporting person exercised a previously issued stock option to purchase 15,000 shares of Class A Common Stock of the Issuer. The option is fully vested and exercisable.
Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
X
 Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Feng Lisa
(Last) (First) (Middle)
C/O ACM RESEARCH, INC.
42307 OSGOOD ROAD, SUITE I
(Street)
FREMONT CA 94539
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
ACM Research, Inc. [ ACMR ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
See remarks
3. Date of Earliest Transaction (Month/Day/Year)
11/12/2025
4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Class A Common Stock 11/12/2025 M(1) 15,000 A $5.6 65,001 D
Class A Common Stock 11/12/2025 S(2) 15,000 D $32.76 50,001 D
Class A Common Stock 11/13/2025 M(3) 15,000 A $5.6 65,001 D
Class A Common Stock 11/13/2025 S(2) 15,000 D $33.77 50,001 D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option $5.6 11/12/2025 M(1) 15,000 (4) 04/22/2029 Class A Common Stock 15,000 $0 15,000 D
Stock Option $5.6 11/13/2025 M(3) 15,000 (4) 04/22/2029 Class A Common Stock 15,000 $0 0 D
Explanation of Responses:
1. On November 12, 2025, the reporting person exercised a previously issued stock option to purchase 15,000 shares of Class A Common Stock of the Issuer.
2. The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 13, 2025.
3. On November 13, 2025, the reporting person exercised a previously issued stock option to purchase 15,000 shares of Class A Common Stock of the Issuer.
4. The option is fully vested and exercisable.
Remarks:
Chief Financial Officer of ACM Research (Shanghai), Inc., a subsidiary of the Issuer
/s/ Mark McKechnie, Attorney-in-Fact for Lisa Feng 11/14/2025
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

Source: View Original Filing on SEC EDGAR

FAQ

What did ACMR’s insider report on Form 4?

Two option exercises of 15,000 shares each at $5.60 on 11/12/2025 and 11/13/2025, and open-market sales of 15,000 shares at $32.76 and 15,000 shares at $33.77.

Were the ACMR trades under a 10b5-1 plan?

Yes. The filing states the sales were effected pursuant to a Rule 10b5-1 trading plan adopted on 08/13/2025.

How many ACMR shares did the insider own after the transactions?

The filing lists 50,001 shares beneficially owned directly after each day’s reported transactions.

What was the exercise price and size of the options?

Each exercise covered 15,000 shares at an exercise price of $5.60.

When do the exercised options expire?

The options have an expiration date of 04/22/2029 and were fully vested and exercisable.

Who is the reporting person’s role at ACM Research?

Remarks identify the person as Chief Financial Officer of ACM Research (Shanghai), Inc., a subsidiary of the issuer.