Sotheara Cheav - Nov 13, 2023 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: Nov 13, 2023
Transactions value $: -$306,835
Form type: 4
Date filed: 11/15/2023, 04:15 PM
Previous filing: Aug 21, 2023
Next filing: Mar 15, 2024

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ACMR	Class A Common Stock	Options Exercise	$72K	+13.5K	+12.27%	$5.33	124K	Nov 13, 2023	Direct	F1
transaction	ACMR	Class A Common Stock	Options Exercise	$57.8K	+12.5K	+10.12%	$4.62	136K	Nov 13, 2023	Direct	F2
transaction	ACMR	Class A Common Stock	Sale	-$437K	-26K	-19.12%	$16.79	110K	Nov 13, 2023	Direct	F3, F4

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	-13.5K	-100%	$0.00^*	0	Nov 13, 2023	Class A Common Stock	13.5K	$5.33	Direct	F1, F5
transaction	ACMR	Stock Option	Options Exercise	$0	-12.5K	-100%	$0.00^*	0	Nov 13, 2023	Class A Common Stock	12.5K	$4.62	Direct	F2, F5

* 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 November 13, 2023, the reporting person exercised a previously issued stock option to purchase 13,500 shares of Class A Common Stock of the Issuer.
F2	On November 13, 2023, the reporting person exercised a previously issued stock option to purchase 12,500 shares of Class A Common Stock of the Issuer.
F3	The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 11, 2023.
F4	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.52 to $17.07, inclusive.
F5	The option is fully vested and exercisable.

Remarks:

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