Wang David H 4

What Happened

• David H. Wang, CEO, President, Director and 10% owner of ACM Research, reported a derivative acquisition: 545,400 shares became vested/exercisable on Feb 4, 2026. The Form 4 shows these as derivative securities acquired at $0.00 (i.e., vesting of previously granted options), not an open-market purchase or sale.

Key Details

• Transaction date: February 4, 2026; Form 4 filed February 6, 2026 (timely).
• Transaction type: Vesting/award of options (reported as derivative acquisition) — 545,400 shares @ $0.00.
• Shares owned after transaction: Not specified in the provided filing text.
• Origin of grant: Options were granted March 20, 2020 covering 1,636,197 shares in total; one-third (545,400) vested with this milestone.
• Remaining contingent shares: Approximately 1,090,797 option shares remain subject to future performance triggers (two remaining tranches).
• Footnote on trigger: Vesting occurred because the issuer’s market capitalization reached or exceeded $3,553,383,586 as of the first trading day when that threshold was met. Market cap is calculated using the 30-day VWAP multiplied by total issued Class A and B shares.

Context

• This filing reports vesting (options became exercisable). It does not show an exercise for cash, a sale, or tax withholding — any exercise or sale would be reported in separate transactions if/when they occur.
• Vesting tied to market-cap milestones is a performance-based award; the transaction is informational (non-cash) and does not by itself signal a purchase or sale of stock.