Sotheara Cheav - Aug 22, 2025 Form 4 Insider Report for ACM Research, Inc. (ACMR)

Role
Senior Vice President, Manufacturing of ACM Research (Shanghai), Inc., a subsidiary of the Issuer.
Signature
/s/ Mark McKechnie, Attorney-in-Fact for Sotheara Cheav
Stock symbol
ACMR
Transactions as of
Aug 22, 2025
Transactions value $
-$179,659
Form type
4
Date filed
8/26/2025, 04:30 PM
Previous filing
Feb 10, 2025
Next filing
Sep 19, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Cheav Sotheara Senior Vice President, Manufacturing of ACM Research (Shanghai), Inc., a subsidiary of the Issuer. C/O ACM RESEARCH, INC., 42307 OSGOOD ROAD, SUITE I, FREMONT /s/ Mark McKechnie, Attorney-in-Fact for Sotheara Cheav 2025-08-26 0001721279

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ACMR Class A Common Stock Options Exercise $155K +11.2K +11.15% $13.89 111K Aug 22, 2025 Direct F1
transaction ACMR Class A Common Stock Sale -$335K -11.2K -10.03% $30.00 100K Aug 22, 2025 Direct F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction ACMR Stock Option Options Exercise $0 -11.2K -14.41% $0.00 66.3K Aug 22, 2025 Class A Common Stock 11.2K $13.89 Direct F1, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

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).

Explanation of Responses:

Id Content
F1 On August 22, 2025, the reporting person exercised a previously issued stock option to purchase 11,152 shares of Class A Common Stock of the Issuer.
F2 The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 15, 2025.
F3 The option will vest and become exercisable as to 7,500 shares on May 15, 2026 and the remaining 22,500 shares will vest and become exercisable in equal monthly installments over the following 36 months, subject to continued service through each vesting date. Option is fully vested and exercisable.

Remarks:

Senior Vice President, Manufacturing of ACM Research (Shanghai), Inc., a subsidiary of the Issuer.