Dun Haiping 4

What Happened Dun Haiping, a director of ACM Research, exercised options on May 19, 2026 and executed open‑market sales the same day. The filing shows an exercise/conversion of 10,000 option shares: 5,000 shares were acquired at $5.60 per share (cost = $28,000) and 5,000 shares are reported as disposed at $0.00 in the derivative line (see Context below). Separately, Dun sold a total of 5,000 shares in multiple open‑market transactions on May 19, 2026 for aggregate proceeds of approximately $331,111 (sales at weighted average prices shown below).

Key Details

• Transaction date: May 19, 2026; Form 4 filed May 21, 2026 (timely — within the 2‑business‑day reporting window).
• Options exercised: 10,000 shares total; 5,000 acquired at $5.60 each (total $28,000). Footnote F6: the option is fully vested and exercisable.
• Shares sold (total 5,000) and reported proceeds (weighted average prices):
  • 1,333 shares @ weighted $63.84 (range $63.70–$64.22) — $85,099 (F2)
  • 500 shares @ weighted $65.09 (range $64.78–$65.77) — $32,545 (F3)
  • 1,309 shares @ weighted $67.21 (range $66.41–$67.37) — $87,978 (F4)
  • 1,858 shares @ weighted $67.54 (range $67.43–$68.00) — $125,489 (F5)
  • Aggregate sale proceeds ≈ $331,111.
• Footnote F1: all sales were effected pursuant to a prearranged Rule 10b5‑1 trading plan adopted Aug 13, 2025.
• Shares owned after the transactions are not stated in the excerpt of the filing.

Context

• The filing shows a 5,000‑share disposal at $0.00 in the derivative line — such entries commonly reflect shares tendered or withheld in connection with the option exercise (e.g., to cover exercise cost or tax withholding) rather than a market sale.
• The combination of exercising options and selling shares that same day is consistent with a cash‑raising or exercise‑related liquidity event; the 10b5‑1 plan indicates the sales were preplanned and not ad hoc market timing.
• This is a director (non‑employee insider) transaction; the filing provides factual detail but does not indicate the director’s motivations.