Sotheara Cheav - 06 Feb 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
Issuer symbol: ACMR
Transactions as of: 06 Feb 2025
Net transactions value: -$205,868
Form type: 4
Filing time: 10 Feb 2025, 16:32:17 UTC
Previous filing: 15 Mar 2024
Next filing: 26 Aug 2025
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ACMR	Class A Common Stock	Options Exercise	$138,900	+10,000	+10%	$13.89	110,002	06 Feb 2025	Direct	F1
transaction	ACMR	Class A Common Stock	Options Exercise	$174,986	+12,598	+11%	$13.89	122,600	06 Feb 2025	Direct	F2
transaction	ACMR	Class A Common Stock	Sale	$519,754	-22,598	-18%	$23.00	100,002	06 Feb 2025	Direct	F3

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	-10,000	-10%	$0.000000	90,000	06 Feb 2025	Class A Common Stock	10,000	$13.89	Direct	F1, F4
transaction	ACMR	Stock Option	Options Exercise	$0	-12,598	-14%	$0.000000	77,402	06 Feb 2025	Class A Common Stock	12,598	$13.89	Direct	F2, F4

* 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 February 6, 2025, the reporting person exercised a previously issued stock option to purchase 10,000 shares of Class A Common Stock of the Issuer.
F2	On February 6, 2025, the reporting person exercised a previously issued stock option to purchase 12,598 shares of Class A Common Stock of the Issuer.
F3	The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 13, 2024.
F4	The option will vest and become exercisable as to 25,000 shares on August 09, 2024 and the remaining 75,000 shares will vest and become exercisable in equal monthly installments over the following 36 months, subject to continued service through each vesting date.

Remarks:

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