ACM Research COO receives 100,000 stock options

The option award vests in stages beginning October 1, 2027, while the restricted stock units vest in four annual installments, subject to continued service.

Available on EDGAR 11/06/2026 - 09:35 PM EST Accepted by SEC EDGAR 11/06/2026 - 09:35 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

ACM Research, Inc. (ACMR) Chief Operations Officer Yue NMN Ma received a grant of 100,000 stock options and 13,470 restricted stock units on October 1, 2026. The options have an $83.58 exercise price and expire September 30, 2036. The $74.24 price per restricted stock unit is based on the average closing market price of ACM Research common stock for the 30 trading days preceding the grant date.

Insider Trade Summary

Grant/Award: 113,470 shares

Grant/Award 2 txns

Insider Ma Yue NMN

Role See Remarks

Type	Security	Shares	Price	Value
Grant/Award	Stock Option F1	100,000	$0.00	$0.00
Grant/Award	Restricted Stock Units F2, F3	13,470	$0.00	$0.00

Holdings After Transaction: Stock Option — 100,000 contracts (Direct); Restricted Stock Units — 13,470 contracts (Direct)

Holdings Before and After: Stock Option, 0 to 100,000 contracts (Direct); Restricted Stock Units, 0 to 13,470 contracts (Direct)

Footnotes (3)

1. 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.
2. 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.
3. 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.

Key Figures

Stock options granted: 100,000 options Restricted stock units granted: 13,470 restricted stock units Option exercise price: $83.58 per share +2 more

5 metrics

Stock options granted 100,000 options Granted October 1, 2026

Restricted stock units granted 13,470 restricted stock units Granted October 1, 2026

Option exercise price $83.58 per share Stock option award

Restricted stock unit price $74.24 per unit Based on the average closing market price for the 30 trading days preceding the grant date

Option expiration date September 30, 2036 Stock option award

Key Terms

Restricted Stock Units, exercise price, vesting, average closing market price

4 terms

Restricted Stock Units financial

"The restricted stock units shall vest in four equal annual installments"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

exercise price financial

"The options have an $83.58 exercise price"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

vesting financial

"subject to continued service"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

average closing market price financial

"based on the average closing market price"

FAQ

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

What equity awards did ACMR’s Chief Operations Officer receive?

Yue NMN Ma received 100,000 stock options and 13,470 restricted stock units on October 1, 2026. The options have an $83.58 exercise price and expire September 30, 2036; the price per restricted stock unit is $74.24.

How do Yue NMN Ma’s ACMR awards vest?

The 100,000 options vest 25% on October 1, 2027, with the balance in 36 successive equal monthly installments beginning November 2027. The 13,470 restricted stock units vest in four equal annual installments on each grant anniversary; both schedules are subject to continued service.

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

Form 4 Insider Transactions: What Each Field Means →

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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 CALIFORNIA 94539

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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

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	$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: SEC 1474 (03-26)