SEC Filing Summary for Charles C. Pappis

Charles C. Pappis, a director at ACM Research, Inc., reported a series of transactions on April 17, 2026. Pappis exercised a stock option to acquire 5,000 shares of Class A Common Stock at an exercise price of $29.18 per share. This transaction was part of a Rule 10b5-1 trading plan. Concurrently, Pappis sold these 5,000 shares at $52.00 per share. Following these transactions, Pappis holds no shares directly. The stock option exercised was fully vested and exercisable, with an expiration date of March 14, 2035. This filing is an update to reflect these stock option exercises and subsequent sales.