ACM Research (ACMR) Director Dun Haiping Exercises Options, Sells Shares

What Happened

• Dun Haiping, a director of ACM Research (ACMR), exercised options to acquire 5,000 shares at $5.60 per share (cost $28,000) on August 18, 2026. On the same day he sold a total of 5,000 common shares in open‑market transactions for aggregate proceeds of $405,670. The filing also reports a separate derivative "Disposed" entry for 5,000 shares at $0; no further detail on that entry is provided in the summary.

Key Details

• Transaction date: August 18, 2026; Form filed August 20, 2026 (appears timely under Form 4 rules).
• Option exercise (M): 5,000 shares acquired @ $5.60 = $28,000.
• Open‑market sales (S): 1,200 shares @ $80.29 = $96,348 (prices in this lot ranged $79.89–$80.77), 3,400 shares @ $81.31 = $276,454 (range $80.95–$81.91), and 400 shares @ $82.17 = $32,868 (range $81.97–$82.33). Total sales proceeds ≈ $405,670.
• Additional derivative entry: 5,000 shares reported disposed @ $0 (no value listed); filing gives no explanation for this line.
• Footnotes: Sales were effected pursuant to a Rule 10b5‑1 trading plan adopted August 13, 2025. The option exercised is fully vested and exercisable. The filer offers to provide per‑trade breakdowns on request.
• Shares owned after the transactions: not stated in the provided data.

Context

• The filing shows an option exercise and same‑day open‑market sales. That pattern can reflect an exercise followed by immediate sales, but the Form 4 only reports the transactions and notes the 10b5‑1 plan; it does not state the insider’s motives. Purchases (or long‑term holdings) are typically viewed as stronger bullish signals; this filing primarily reports an exercise plus sales under a prearranged plan.