Award4

ACM Research, Inc.

Total Value

$8.4M

Filing Date

Nov 6, 2026

1 transactions

Trade Summary

On Oct 1, 2026, Ma Yue NMN, Insider, reported $8.4M of ACM Research, Inc. (ACMR) across 1 transactions. The filing covers company securities and reflects balanced net activity of $0. Reported prices ranged from $83.58. Insider transactions are sourced from SEC Form 4 disclosures and should be reviewed alongside company fundamentals and the insider's broader trading history.

Insider Information

Name: Ma Yue NMN
Role: Insider
Location: FREMONT, CA

Filing Details

Filing Date: Nov 6, 2026
Transaction Date: Oct 1, 2026
Accession Number: 0001140361-26-042540
Form Type: 4

Derivative Transactions

Date	Security	Shares	Exercise Price	Type	Value
Oct 1, 2026	ACMR derivative	100,000	$83.58	Grant/Award	$8.4M
Oct 1, 2026	ACMR derivative	13,470	—	Grant/Award	—

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Footnotes

(F1)Twenty-five percent of the stock option shares shall vest on October 1, 2027, with the balance of the stock option shares vesting in thirty-six successive equal monthly installments as of the first day of each month beginning November 2027, subject to continued service.
(F2)The price per restricted stock unit is based on the average closing market price of the Issuer's common stock for the 30 trading days preceding the grant date.
(F3)The restricted stock units shall vest in four equal annual installments of twenty-five percent on each anniversary of the grant date, subject to continued service.

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).

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^*

Ma Yue NMN

(Last)

(First)

(Middle)

C/O ACM RESEARCH, INC.

42307 OSGOOD ROAD, SUITE I

(Street)

FREMONT

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)
10/01/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Stock Option	$83.58	10/01/2026		A		100,000		⁽¹⁾	09/30/2036	Class A Common Stock	100,000	$0	100,000	D
Restricted Stock Units	$74.24⁽²⁾	10/01/2026		A		13,470		⁽³⁾	⁽³⁾	Class A Common Stock	13,470	$0	13,470	D

Explanation of Responses:

1. Twenty-five percent of the stock option shares shall vest on October 1, 2027, with the balance of the stock option shares vesting in thirty-six successive equal monthly installments as of the first day of each month beginning November 2027, subject to continued service.

2. The price per restricted stock unit is based on the average closing market price of the Issuer's common stock for the 30 trading days preceding the grant date.

3. The restricted stock units shall vest in four equal annual installments of twenty-five percent on each anniversary of the grant date, subject to continued service.

Remarks:

Chief Operations Officer

	/s/ Mark McKechnie, Attorney-in-Fact for Yue Ma	11/06/2026
	** 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.

Form 4 as rendered by the SEC from accession 0001140361-26-042540.

ACM Research, Inc.

Trade Summary

Company Information

Insider Information

Filing Details

Derivative Transactions

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Footnotes

SEC Form 4

SEC Filing

SEC Form 4