Form 4 Filing for Charles C. Pappis

Charles C. Pappis, a director at ACM Research, Inc., acquired 6,400 stock options and 728 restricted stock units on August 12, 2026. The stock options have an exercise price of $81.26 and will vest prior to the 2027 annual meeting, subject to continued service. The restricted stock units have a price based on the average closing market price over the 30 trading days preceding the grant and are also subject to vesting conditions related to the 2027 annual meeting and continued service. Both transactions were marked as direct ownership.