ACM Research Director Haiping Dun Exercises Options and Sells Shares Under 10b5-1 Plan

ACM Research, Inc. director Haiping Dun filed a Form 4 on May 21, 2026, reporting significant securities transactions on May 19, 2026. Dun exercised stock options for 5,000 shares at $5.60 per share and subsequently sold all 5,000 shares through a Rule 10b5-1 trading plan adopted in August 2025. The sales occurred in multiple transactions at weighted average prices ranging from $63.84 to $67.54 per share, resulting in the complete disposition of his directly held Class A Common Stock. Following these transactions, Dun maintains indirect ownership through trusts totaling 855,090 shares. The option exercised was fully vested with an expiration date of April 22, 2029. The transactions represent a substantial profit realization from the option exercise and subsequent sale of ACM Research shares.