ACMR subsidiary CFO discloses 15k-share Rule 10b5-1 sale

Rhea-AI Filing Summary

ACM Research (ACMR) filed a Form 4 reporting that subsidiary CFO Lisa Feng exercised 15,000 stock options at $5.60 and immediately sold the same number of Class A shares at $26.00 on 06/24/2025 under a Rule 10b5-1 plan. Cash proceeds totaled roughly $390 k; her beneficial ownership remains 50,001 shares, indicating no net change in holdings.

Insider Trade Summary

Net Seller: 15,000 shares ($390,000)

Net Sell 3 txns

Insider Feng Lisa

Role See remarks

Sold 15,000 shs ($390K)

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	$26.00	$390K

Holdings After Transaction: Stock Option — 45,000 shares (Direct); Class A Common Stock — 65,001 shares (Direct)

Footnotes (1)

1. On June 24, 2025, the reporting person exercised a previously issued stock option to purchase 15,000 shares of Class A Common Stock of the Issuer. The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 12, 2025. 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)
06/24/2025

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	06/24/2025		M(1)		15,000	A	$5.6	65,001	D
Class A Common Stock	06/24/2025		S(2)		15,000	D	$26	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	06/24/2025		M(1)			15,000	(3)	04/22/2029	Class A Common Stock	15,000	$0	45,000	D

Explanation of Responses:

1. On June 24, 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 sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 12, 2025.

3. 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	06/26/2025
	** 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.

FAQ

Why did ACMR's Lisa Feng file a Form 4 on 06/26/2025?

She reported exercising 15,000 stock options and selling the same number of ACMR shares on 06/24/2025.

How many ACMR shares did Lisa Feng sell and at what price?

She sold 15,000 Class A shares at $26.00 each, totaling approximately $390,000.

Did the transaction change Lisa Feng's ownership in ACMR?

No. After the exercise and sale, she still holds 50,001 shares—unchanged from before the transactions.

Was Lisa Feng's sale conducted under a trading plan?

Yes. The sale was executed under a pre-arranged Rule 10b5-1 plan adopted on March 12, 2025.