ACM Research Inc

On March 6, 2025, Tracy Liu, a member of the Board of Directors of ACM Research, adopted a Rule 10b5-1 trading arrangement (the "Liu Plan") that is intended to satisfy the affirmative defense of Rule 10b5-1(c) of the Exchange Act. The Liu Plan allows for the contemporaneous exercise of options and sale of up to 30,000 shares of Class A Common Stock, at specific market prices, commencing on June 9, 2025, and continuing until (i) all such options are exercised and the underlying shares are sold, (ii)March 13, 2026, or (iii) such date that the Liu Plan is otherwise terminated according to its terms, whichever comes first.

On March 12, 2025, Lisa Yi Lu Feng, Chief Financial Officer of ACM Research (Shanghai), Inc., adopted a Rule 10b5-1 trading arrangement (the “Feng Plan”) that is intended to satisfy the affirmative defense of Rule 10b5-1(c) of the Exchange Act. The Feng Plan allows for the contemporaneous exercise of options and sale of up to 30,000 shares of Class A Common Stock, at specific market prices, commencing on June 12, 2025, and continuing until (i) all such options are exercised and the underlying shares are sold, (ii)June 15, 2026, or (iii) such date that the Feng Plan is otherwise terminated according to its terms, whichever comes first.