Dun Haiping 4

What Happened

• Dun Haiping, a director of ACM Research (ACMR), exercised 5,000 stock options at $5.60 per share (total cost $28,000) on March 9, 2026. The filing also reports the disposition of 5,000 shares the same day: 4,100 sold at a weighted avg $43.37 for $177,817 and 900 sold at a weighted avg $43.94 for $39,546, for total proceeds of $217,363. The Form 4 also shows a derivative disposition entry for 5,000 shares at $0 (related to the option exercise).

Key Details

• Transaction date: 2026-03-09; Form 4 filed 2026-03-11 (appears timely).
• Exercise: 5,000 shares @ $5.60 = $28,000 (option fully vested per filing).
• Sales: 4,100 shares @ weighted avg $43.37 ($177,817) and 900 shares @ weighted avg $43.94 ($39,546); combined proceeds ~$217,363. Reported weighted-price ranges: $42.88–$43.87 and $43.90–$44.00.
• Footnotes: Sales were executed under a Rule 10b5-1 trading plan adopted Aug 13, 2025. Option is fully vested.
• Shares owned after transaction: Not specified in the provided filing.

Context

• The filing shows an exercise of options followed by same-day sales — commonly an exercise-and-sell pattern. The presence of a 10b5-1 plan indicates the sales were prearranged and routine rather than ad-hoc trades. The cash received from sales (~$217k) substantially exceeded the exercise cost ($28k); the filing does not state whether this was a cashless exercise or to cover taxes/fees.