ACM Research Inc

Rule 10b5-1 Trading Plans

On March 7, 2024, Jian Wang, Chief Executive Officer and President of ACM Shanghai, adopted a Rule 10b5-1 trading arrangement (the “Wang Plan”) that is intended to satisfy the affirmative defense of Rule 10b5-1(c) of the Exchange Act. The Wang Plan allows for the contemporaneous exercise of options and sale of up to 120,000 shares of Class A common stock, at specific market prices, commencing on June 6, 2024, and continuing until (i) all such options are exercised and the underlying shares are sold, (ii) December 31, 2024, or (iii) such date that the Wang Plan is otherwise terminated according to its terms, whichever comes first.

On March 7, 2024, Mark McKechnie, Chief Financial Officer of ACM Research, adopted a Rule 10b5-1 trading arrangement (the “McKechnie Plan”) that is intended to satisfy the affirmative defense of Rule 10b5-1(c) of the Exchange Act. The McKechnie Plan allows for the contemporaneous exercise of options and sale of up to 81,516 shares of Class A common stock, at specific market prices, commencing on June 6, 2024, and continuing until (i) all such options are exercised and the underlying shares are sold, (ii) December 31, 2025, or (iii) such date that the McKechnie Plan is otherwise terminated according to its terms, whichever comes first.

On March 14, 2024, Lisa Feng, Chief Financial Officer of ACM Shanghai, 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 13, 2024, and continuing until (i) all such options are exercised and the underlying shares are sold, (ii) June 4, 2025, or (iii) such date that the Feng Plan is otherwise terminated according to its terms, whichever comes first.